diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index 9bc3b0a..94fb020 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -1,40 +1,19 @@
-Notes:
-* Pull requests cannot be accepted until the PR follows the [contributing guidelines](../CONTRIBUTING.md). In particular, each commit must have at least one `Signed-off-by:` line from the committer to certify that the contribution is made under the terms of the [Developer Certificate of Origin](../dco.txt).
-* This is just a template, so feel free to use/remove the unnecessary things
 ## Description
-A few sentences describing the overall goals of the pull request's commits.
+
+Please write a few sentences describing the overall goals of the pull request's commits.
 
 
-## Status
-**READY/IN DEVELOPMENT/HOLD**
 
-## Requires Backporting
-When there is a bug fix, it should be backported to all maintained and supported branches.
-Changes do not have to be backported if:
-- This PR is a new feature\enhancement
-- This PR contains changes in the API. If this is true, and there is a need for the fix to be backported, the fix should be handled differently in the legacy branch
+## Gatekeeper checklist
 
-Yes | NO  
-Which branch?
-
-## Requires ChangeLog entry
-
-YES | NO - if no, why not?
-
-## Migrations
-If there is any API change, what's the incentive and logic for it.
-
-YES | NO
-
-## Additional comments
-Any additional information that could be of interest
-
-## Todos
-- [ ] Tests
-- [ ] Documentation
-- [ ] Changelog updated
-- [ ] Backported
+- [ ] **changelog** provided, or not required
+- [ ] **backport** done, or not required
+- [ ] **tests** provided, or not required
 
 
-## Steps to test or reproduce
-Outline the steps to test or reproduce the PR here.
+
+## Notes for the submitter
+
+Please refer to the [contributing guidelines](../CONTRIBUTING.md), especially the
+checklist for PR contributors.
+
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0e2cf49..d19fe57 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,9 +1,16 @@
 Contributing
 ============
-We gratefully accept bug reports and contributions from the community. There are some requirements we need to fulfill in order to be able to integrate contributions:
+We gratefully accept bug reports and contributions from the community. All PRs are reviewed by the project team / community, and may need some modifications to
+be accepted.
 
- - As with any open source project, contributions will be reviewed by the project team and community and may need some modifications to be accepted.
- - The contribution should not break API or ABI, unless there is a real justification for that. If there is an API change, the contribution, if accepted, will be merged only when there will be a major release.
+Quick Checklist for PR contributors
+-----------------------------------
+More details on all of these points may be found in the sections below.
+
+- [Sign-off](#license-and-copyright): all commits must be signed off.
+- [Tests](#tests): please ensure the PR includes adequate tests.
+- [Changelog](#documentation): if needed, please provide a changelog entry.
+- [Backports](#long-term-support-branches): provide a backport if needed (it's fine to wait until the main PR is accepted).
 
 Coding Standards
 ----------------
@@ -25,7 +32,7 @@
 
 The project aims to minimise the impact on users upgrading to newer versions of the library and it should not be necessary for a user to make any changes to their own code to work with a newer version of the library. Unless the user has made an active decision to use newer features, a newer generation of the library or a change has been necessary due to a security issue or other significant software defect, no modifications to their own code should be necessary. To achieve this, API compatibility is maintained between different versions of Mbed TLS on the main development branch and in LTS (Long Term Support) branches, as described in [BRANCHES.md](BRANCHES.md).
 
-To minimise such disruption to users, where a change to the interface is required, all changes to the ABI or API, even on the main development branch where new features are added, need to be justifiable by either being a significant enhancement, new feature or bug fix which is best resolved by an interface change.
+To minimise such disruption to users, where a change to the interface is required, all changes to the ABI or API, even on the main development branch where new features are added, need to be justifiable by either being a significant enhancement, new feature or bug fix which is best resolved by an interface change. If there is an API change, the contribution, if accepted, will be merged only when there will be a major release.
 
 Where changes to an existing interface are necessary, functions in the public interface which need to be changed, are marked as 'deprecated'. This is done with the preprocessor symbols `MBEDTLS_DEPRECATED_WARNING` and `MBEDTLS_DEPRECATED_REMOVED`. Then, a new function with a new name but similar if not identical behaviour to the original function containing the necessary changes should be created alongside the existing deprecated function.
 
diff --git a/ChangeLog.d/cert_write-set-extended-key-usages.txt b/ChangeLog.d/cert_write-set-extended-key-usages.txt
new file mode 100644
index 0000000..18b7b04
--- /dev/null
+++ b/ChangeLog.d/cert_write-set-extended-key-usages.txt
@@ -0,0 +1,6 @@
+Features
+   * cert_write: support for setting extended key usage attributes. A
+     corresponding new public API call has been added in the library,
+     mbedtls_x509write_crt_set_ext_key_usage().
+   * cert_write: support for writing certificate files in either PEM
+     or DER format.
diff --git a/ChangeLog.d/fix_zeroization.txt b/ChangeLog.d/fix_zeroization.txt
new file mode 100644
index 0000000..ad74d9c
--- /dev/null
+++ b/ChangeLog.d/fix_zeroization.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix possible crash in TLS PRF code, if a failure to allocate memory occurs.
+     Reported by Michael Madsen in #6516.
diff --git a/README.md b/README.md
index cc61da0..1a4edb0 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@
 
 The main Mbed TLS documentation is available via [ReadTheDocs](https://mbed-tls.readthedocs.io/).
 
-Documentation for the PSA Cryptography API is available [on GitHub](https://armmbed.github.io/mbed-crypto/psa/#application-programming-interface).
+Documentation for the PSA Cryptography API is available [on GitHub](https://arm-software.github.io/psa-api/crypto/).
 
 To generate a local copy of the library documentation in HTML format, tailored to your compile-time configuration:
 
@@ -265,11 +265,11 @@
 PSA cryptography API
 --------------------
 
-### PSA API design
+### PSA API
 
 Arm's [Platform Security Architecture (PSA)](https://developer.arm.com/architectures/security-architectures/platform-security-architecture) is a holistic set of threat models, security analyses, hardware and firmware architecture specifications, and an open source firmware reference implementation. PSA provides a recipe, based on industry best practice, that allows security to be consistently designed in, at both a hardware and firmware level.
 
-The [PSA cryptography API](https://armmbed.github.io/mbed-crypto/psa/#application-programming-interface) provides access to a set of cryptographic primitives. It has a dual purpose. First, it can be used in a PSA-compliant platform to build services, such as secure boot, secure storage and secure communication. Second, it can also be used independently of other PSA components on any platform.
+The [PSA cryptography API](https://arm-software.github.io/psa-api/crypto/) provides access to a set of cryptographic primitives. It has a dual purpose. First, it can be used in a PSA-compliant platform to build services, such as secure boot, secure storage and secure communication. Second, it can also be used independently of other PSA components on any platform.
 
 The design goals of the PSA cryptography API include:
 
@@ -281,10 +281,6 @@
 
 Arm welcomes feedback on the design of the API. If you think something could be improved, please open an issue on our Github repository. Alternatively, if you prefer to provide your feedback privately, please email us at [`mbed-crypto@arm.com`](mailto:mbed-crypto@arm.com). All feedback received by email is treated confidentially.
 
-### PSA API documentation
-
-A browsable copy of the PSA Cryptography API documents is available on the [PSA cryptography interfaces documentation portal](https://armmbed.github.io/mbed-crypto/psa/#application-programming-interface) in [PDF](https://armmbed.github.io/mbed-crypto/PSA_Cryptography_API_Specification.pdf) and [HTML](https://armmbed.github.io/mbed-crypto/html/index.html) formats.
-
 ### PSA implementation in Mbed TLS
 
 Mbed TLS includes a reference implementation of the PSA Cryptography API.
diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 6c09b3a..d2b7648 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -1146,6 +1146,19 @@
                                          unsigned int key_usage );
 
 /**
+ * \brief           Set the Extended Key Usage Extension
+ *                  (e.g. MBEDTLS_OID_SERVER_AUTH)
+ *
+ * \param ctx       CRT context to use
+ * \param exts      extended key usage extensions to set, a sequence of
+ *                  MBEDTLS_ASN1_OID objects
+ *
+ * \return          0 if successful, or MBEDTLS_ERR_X509_ALLOC_FAILED
+ */
+int mbedtls_x509write_crt_set_ext_key_usage( mbedtls_x509write_cert *ctx,
+                                             const mbedtls_asn1_sequence *exts );
+
+/**
  * \brief           Set the Netscape Cert Type flags
  *                  (e.g. MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT | MBEDTLS_X509_NS_CERT_TYPE_EMAIL)
  *
diff --git a/library/psa_crypto_aead.c b/library/psa_crypto_aead.c
index 48969b3..730ef95 100644
--- a/library/psa_crypto_aead.c
+++ b/library/psa_crypto_aead.c
@@ -24,6 +24,7 @@
 
 #include "psa_crypto_aead.h"
 #include "psa_crypto_core.h"
+#include "psa_crypto_cipher.h"
 
 #include <string.h>
 #include "mbedtls/platform.h"
diff --git a/library/psa_crypto_cipher.h b/library/psa_crypto_cipher.h
index fae9847..3bd5360 100644
--- a/library/psa_crypto_cipher.h
+++ b/library/psa_crypto_cipher.h
@@ -1,5 +1,5 @@
 /*
- *  PSA cipher driver entry points
+ *  PSA cipher driver entry points and associated auxiliary functions
  */
 /*
  *  Copyright The Mbed TLS Contributors
diff --git a/library/psa_crypto_core.h b/library/psa_crypto_core.h
index 8c91b04..9863848 100644
--- a/library/psa_crypto_core.h
+++ b/library/psa_crypto_core.h
@@ -246,22 +246,6 @@
  */
 psa_status_t mbedtls_to_psa_error( int ret );
 
-/** Get Mbed TLS cipher information given the cipher algorithm PSA identifier
- *  as well as the PSA type and size of the key to be used with the cipher
- *  algorithm.
- *
- * \param       alg        PSA cipher algorithm identifier
- * \param       key_type   PSA key type
- * \param       key_bits   Size of the key in bits
- * \param[out]  cipher_id  Mbed TLS cipher algorithm identifier
- *
- * \return  The Mbed TLS cipher information of the cipher algorithm.
- *          \c NULL if the PSA cipher algorithm is not supported.
- */
-const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
-    psa_algorithm_t alg, psa_key_type_t key_type, size_t key_bits,
-    mbedtls_cipher_id_t *cipher_id );
-
 /** Import a key in binary format.
  *
  * \note The signature of this function is that of a PSA driver
diff --git a/library/psa_crypto_mac.c b/library/psa_crypto_mac.c
index dcf065a..d771e23 100644
--- a/library/psa_crypto_mac.c
+++ b/library/psa_crypto_mac.c
@@ -24,6 +24,7 @@
 
 #include <psa/crypto.h>
 #include "psa_crypto_core.h"
+#include "psa_crypto_cipher.h"
 #include "psa_crypto_mac.h"
 #include <mbedtls/md.h>
 
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index a49f774..3c91b45 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -5635,7 +5635,9 @@
 exit:
     mbedtls_md_free( &md_ctx );
 
-    mbedtls_platform_zeroize( tmp, tmp_len );
+    if ( tmp != NULL )
+        mbedtls_platform_zeroize( tmp, tmp_len );
+
     mbedtls_platform_zeroize( h_i, sizeof( h_i ) );
 
     mbedtls_free( tmp );
diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index 52942a9..254c4b2 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -296,6 +296,43 @@
     return( 0 );
 }
 
+int mbedtls_x509write_crt_set_ext_key_usage( mbedtls_x509write_cert *ctx,
+                                             const mbedtls_asn1_sequence *exts )
+{
+    unsigned char buf[256];
+    unsigned char *c = buf + sizeof(buf);
+    int ret;
+    size_t len = 0;
+    const mbedtls_asn1_sequence *last_ext = NULL;
+    const mbedtls_asn1_sequence *ext;
+
+    memset( buf, 0, sizeof(buf) );
+
+    /* We need at least one extension: SEQUENCE SIZE (1..MAX) OF KeyPurposeId */
+    if( exts == NULL )
+        return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
+
+    /* Iterate over exts backwards, so we write them out in the requested order */
+    while( last_ext != exts )
+    {
+        for( ext = exts; ext->next != last_ext; ext = ext->next ) {}
+        if( ext->buf.tag != MBEDTLS_ASN1_OID )
+            return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
+        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( &c, buf, ext->buf.p, ext->buf.len ) );
+        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, ext->buf.len ) );
+        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OID ) );
+        last_ext = ext;
+    }
+
+    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
+    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
+
+    return mbedtls_x509write_crt_set_extension( ctx,
+                         MBEDTLS_OID_EXTENDED_KEY_USAGE,
+                         MBEDTLS_OID_SIZE( MBEDTLS_OID_EXTENDED_KEY_USAGE ),
+                         1, c, len );
+}
+
 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
                                     unsigned char ns_cert_type )
 {
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index c93ff1e..f9366fe 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -38,6 +38,7 @@
 
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/x509_csr.h"
+#include "mbedtls/oid.h"
 #include "mbedtls/entropy.h"
 #include "mbedtls/ctr_drbg.h"
 #include "mbedtls/md.h"
@@ -47,6 +48,9 @@
 #include <stdlib.h>
 #include <string.h>
 
+#define SET_OID(x, oid) \
+    do { x.len = MBEDTLS_OID_SIZE(oid); x.p = (unsigned char*)oid; } while( 0 )
+
 #if defined(MBEDTLS_X509_CSR_PARSE_C)
 #define USAGE_CSR                                                           \
     "    request_file=%%s         default: (empty)\n"                           \
@@ -56,6 +60,9 @@
 #define USAGE_CSR ""
 #endif /* MBEDTLS_X509_CSR_PARSE_C */
 
+#define FORMAT_PEM              0
+#define FORMAT_DER              1
+
 #define DFL_ISSUER_CRT          ""
 #define DFL_REQUEST_FILE        ""
 #define DFL_SUBJECT_KEY         "subject.key"
@@ -71,13 +78,16 @@
 #define DFL_SELFSIGN            0
 #define DFL_IS_CA               0
 #define DFL_MAX_PATHLEN         -1
+#define DFL_SIG_ALG             MBEDTLS_MD_SHA256
 #define DFL_KEY_USAGE           0
+#define DFL_EXT_KEY_USAGE       NULL
 #define DFL_NS_CERT_TYPE        0
 #define DFL_VERSION             3
 #define DFL_AUTH_IDENT          1
 #define DFL_SUBJ_IDENT          1
 #define DFL_CONSTRAINTS         1
 #define DFL_DIGEST              MBEDTLS_MD_SHA256
+#define DFL_FORMAT              FORMAT_PEM
 
 #define USAGE \
     "\n usage: cert_write param=<>...\n"                \
@@ -129,6 +139,14 @@
     "                            key_cert_sign\n"  \
     "                            crl_sign\n"              \
     "                            (Considered for v3 only)\n"\
+    "    ext_key_usage=%%s        default: (empty)\n"      \
+    "                            Comma-separated-list of values:\n"     \
+    "                            serverAuth\n"             \
+    "                            clientAuth\n"             \
+    "                            codeSigning\n"            \
+    "                            emailProtection\n"        \
+    "                            timeStamping\n"           \
+    "                            OCSPSigning\n"            \
     "    ns_cert_type=%%s         default: (empty)\n"       \
     "                            Comma-separated-list of values:\n"     \
     "                            ssl_client\n"            \
@@ -138,6 +156,7 @@
     "                            ssl_ca\n"                \
     "                            email_ca\n"              \
     "                            object_signing_ca\n"     \
+    "   format=pem|der           default: pem\n"         \
     "\n"
 
 
@@ -167,7 +186,9 @@
     int version;                /* CRT version                          */
     mbedtls_md_type_t md;       /* Hash used for signing                */
     unsigned char key_usage;    /* key usage flags                      */
+    mbedtls_asn1_sequence *ext_key_usage; /* extended key usages        */
     unsigned char ns_cert_type; /* NS cert type                         */
+    int format;                 /* format                               */
 } opt;
 
 int write_certificate( mbedtls_x509write_cert *crt, const char *output_file,
@@ -177,19 +198,33 @@
     int ret;
     FILE *f;
     unsigned char output_buf[4096];
+    unsigned char *output_start;
     size_t len = 0;
 
     memset( output_buf, 0, 4096 );
-    if( ( ret = mbedtls_x509write_crt_pem( crt, output_buf, 4096,
-                                           f_rng, p_rng ) ) < 0 )
-        return( ret );
+    if ( opt.format == FORMAT_DER )
+    {
+        ret = mbedtls_x509write_crt_der( crt, output_buf, 4096,
+                                           f_rng, p_rng );
+        if( ret < 0 )
+            return( ret );
 
-    len = strlen( (char *) output_buf );
+        len = ret;
+        output_start = output_buf + 4096 - len;
+    } else {
+        ret = mbedtls_x509write_crt_pem( crt, output_buf, 4096,
+                                           f_rng, p_rng );
+        if( ret < 0 )
+            return( ret );
+
+        len = strlen( (char *) output_buf );
+        output_start = output_buf;
+    }
 
     if( ( f = fopen( output_file, "w" ) ) == NULL )
         return( -1 );
 
-    if( fwrite( output_buf, 1, len, f ) != len )
+    if( fwrite( output_start, 1, len, f ) != len )
     {
         fclose( f );
         return( -1 );
@@ -218,6 +253,7 @@
 #endif
     mbedtls_x509write_cert crt;
     mbedtls_mpi serial;
+    mbedtls_asn1_sequence *ext_key_usage;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
     const char *pers = "crt example app";
@@ -235,7 +271,7 @@
     mbedtls_x509_csr_init( &csr );
 #endif
     mbedtls_x509_crt_init( &issuer_crt );
-    memset( buf, 0, 1024 );
+    memset( buf, 0, sizeof(buf) );
 
     if( argc == 0 )
     {
@@ -260,12 +296,14 @@
     opt.is_ca               = DFL_IS_CA;
     opt.max_pathlen         = DFL_MAX_PATHLEN;
     opt.key_usage           = DFL_KEY_USAGE;
+    opt.ext_key_usage       = DFL_EXT_KEY_USAGE;
     opt.ns_cert_type        = DFL_NS_CERT_TYPE;
     opt.version             = DFL_VERSION - 1;
     opt.md                  = DFL_DIGEST;
     opt.subject_identifier   = DFL_SUBJ_IDENT;
     opt.authority_identifier = DFL_AUTH_IDENT;
     opt.basic_constraints    = DFL_CONSTRAINTS;
+    opt.format              = DFL_FORMAT;
 
     for( i = 1; i < argc; i++ )
     {
@@ -417,6 +455,41 @@
                 q = r;
             }
         }
+        else if( strcmp( p, "ext_key_usage" ) == 0 )
+        {
+            mbedtls_asn1_sequence **tail = &opt.ext_key_usage;
+
+            while( q != NULL )
+            {
+                if( ( r = strchr( q, ',' ) ) != NULL )
+                    *r++ = '\0';
+
+                ext_key_usage = mbedtls_calloc( 1, sizeof(mbedtls_asn1_sequence) );
+                ext_key_usage->buf.tag = MBEDTLS_ASN1_OID;
+                if( strcmp( q, "serverAuth" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_SERVER_AUTH );
+                else if( strcmp( q, "clientAuth" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_CLIENT_AUTH );
+                else if( strcmp( q, "codeSigning" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_CODE_SIGNING );
+                else if( strcmp( q, "emailProtection" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_EMAIL_PROTECTION );
+                else if( strcmp( q, "timeStamping" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_TIME_STAMPING );
+                else if( strcmp( q, "OCSPSigning" ) == 0 )
+                    SET_OID( ext_key_usage->buf, MBEDTLS_OID_OCSP_SIGNING );
+                else
+                {
+                    mbedtls_printf( "Invalid argument for option %s\n", p );
+                    goto usage;
+                }
+
+                *tail = ext_key_usage;
+                tail = &ext_key_usage->next;
+
+                q = r;
+            }
+        }
         else if( strcmp( p, "ns_cert_type" ) == 0 )
         {
             while( q != NULL )
@@ -447,6 +520,16 @@
                 q = r;
             }
         }
+        else if( strcmp( p, "format" ) == 0 )
+        {
+            if      ( strcmp(q, "der" ) == 0 ) opt.format = FORMAT_DER;
+            else if ( strcmp(q, "pem" ) == 0 ) opt.format = FORMAT_PEM;
+            else
+            {
+                mbedtls_printf( "Invalid argument for option %s\n", p );
+                goto usage;
+            }
+        }
         else
             goto usage;
     }
@@ -463,7 +546,7 @@
                                (const unsigned char *) pers,
                                strlen( pers ) ) ) != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_ctr_drbg_seed returned %d - %s\n",
                         ret, buf );
         goto exit;
@@ -478,7 +561,7 @@
 
     if( ( ret = mbedtls_mpi_read_string( &serial, 10, opt.serial ) ) != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_mpi_read_string "
                         "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -498,7 +581,7 @@
 
         if( ( ret = mbedtls_x509_crt_parse_file( &issuer_crt, opt.issuer_crt ) ) != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_file "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -508,7 +591,7 @@
                                  &issuer_crt.subject );
         if( ret < 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509_dn_gets "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -532,7 +615,7 @@
 
         if( ( ret = mbedtls_x509_csr_parse_file( &csr, opt.request_file ) ) != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509_csr_parse_file "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -542,7 +625,7 @@
                                  &csr.subject );
         if( ret < 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509_dn_gets "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -567,7 +650,7 @@
                 opt.subject_pwd, mbedtls_ctr_drbg_random, &ctr_drbg );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -583,7 +666,7 @@
             opt.issuer_pwd, mbedtls_ctr_drbg_random, &ctr_drbg );
     if( ret != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile "
                         "returned -x%02x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -618,7 +701,7 @@
      */
     if( ( ret = mbedtls_x509write_crt_set_subject_name( &crt, opt.subject_name ) ) != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_subject_name "
                         "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -626,7 +709,7 @@
 
     if( ( ret = mbedtls_x509write_crt_set_issuer_name( &crt, opt.issuer_name ) ) != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_issuer_name "
                         "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -641,7 +724,7 @@
     ret = mbedtls_x509write_crt_set_serial( &crt, &serial );
     if( ret != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_serial "
                         "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -650,7 +733,7 @@
     ret = mbedtls_x509write_crt_set_validity( &crt, opt.not_before, opt.not_after );
     if( ret != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_validity "
                         "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
         goto exit;
@@ -668,7 +751,7 @@
                                                            opt.max_pathlen );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  x509write_crt_set_basic_contraints "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -687,7 +770,7 @@
         ret = mbedtls_x509write_crt_set_subject_key_identifier( &crt );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_subject"
                             "_key_identifier returned -0x%04x - %s\n\n",
                             (unsigned int) -ret, buf );
@@ -706,7 +789,7 @@
         ret = mbedtls_x509write_crt_set_authority_key_identifier( &crt );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_authority_"
                             "key_identifier returned -0x%04x - %s\n\n",
                             (unsigned int) -ret, buf );
@@ -726,7 +809,7 @@
         ret = mbedtls_x509write_crt_set_key_usage( &crt, opt.key_usage );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_key_usage "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -735,6 +818,22 @@
         mbedtls_printf( " ok\n" );
     }
 
+    if( opt.ext_key_usage )
+    {
+        mbedtls_printf( "  . Adding the Extended Key Usage extension ..." );
+        fflush( stdout );
+
+        ret = mbedtls_x509write_crt_set_ext_key_usage( &crt, opt.ext_key_usage );
+        if( ret != 0 )
+        {
+            mbedtls_strerror( ret, buf, sizeof(buf) );
+            mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_ext_key_usage returned -0x%02x - %s\n\n", (unsigned int) -ret, buf );
+            goto exit;
+        }
+
+        mbedtls_printf( " ok\n" );
+    }
+
     if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
         opt.ns_cert_type != 0 )
     {
@@ -744,7 +843,7 @@
         ret = mbedtls_x509write_crt_set_ns_cert_type( &crt, opt.ns_cert_type );
         if( ret != 0 )
         {
-            mbedtls_strerror( ret, buf, 1024 );
+            mbedtls_strerror( ret, buf, sizeof(buf) );
             mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_ns_cert_type "
                             "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
             goto exit;
@@ -762,7 +861,7 @@
     if( ( ret = write_certificate( &crt, opt.output_file,
                                    mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
     {
-        mbedtls_strerror( ret, buf, 1024 );
+        mbedtls_strerror( ret, buf, sizeof(buf) );
         mbedtls_printf( " failed\n  !  write_certificate -0x%04x - %s\n\n",
                         (unsigned int) -ret, buf );
         goto exit;
diff --git a/tests/configs/tls13-only.h b/tests/configs/tls13-only.h
index 0a22c54..7483f1c 100644
--- a/tests/configs/tls13-only.h
+++ b/tests/configs/tls13-only.h
@@ -22,9 +22,11 @@
  *  limitations under the License.
  */
 
+/* Enable TLS 1.3 and core 1.3 features */
 #define MBEDTLS_SSL_PROTO_TLS1_3
 #define MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
 
+/* Disable TLS 1.2 and 1.2-specific features */
 #undef MBEDTLS_SSL_ENCRYPT_THEN_MAC
 #undef MBEDTLS_SSL_EXTENDED_MASTER_SECRET
 #undef MBEDTLS_SSL_PROTO_TLS1_2
@@ -32,3 +34,6 @@
 #undef MBEDTLS_SSL_DTLS_ANTI_REPLAY
 #undef MBEDTLS_SSL_DTLS_HELLO_VERIFY
 #undef MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE
+
+/* Enable some invasive tests */
+#define MBEDTLS_TEST_HOOKS
diff --git a/tests/data_files/server1.key_ext_usage.crt b/tests/data_files/server1.key_ext_usage.crt
new file mode 100644
index 0000000..bbe2c35
--- /dev/null
+++ b/tests/data_files/server1.key_ext_usage.crt
@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/data_files/server1.key_ext_usages.crt b/tests/data_files/server1.key_ext_usages.crt
new file mode 100644
index 0000000..0c3d963
--- /dev/null
+++ b/tests/data_files/server1.key_ext_usages.crt
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index e8f1726..9295c9d 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1542,12 +1542,15 @@
 component_test_full_cmake_clang () {
     msg "build: cmake, full config, clang" # ~ 50s
     scripts/config.py full
-    CC=clang cmake -D CMAKE_BUILD_TYPE:String=Release -D ENABLE_TESTING=On .
+    CC=clang CXX=clang cmake -D CMAKE_BUILD_TYPE:String=Release -D ENABLE_TESTING=On -D TEST_CPP=1 .
     make
 
     msg "test: main suites (full config, clang)" # ~ 5s
     make test
 
+    msg "test: cpp_dummy_build (full config, clang)" # ~ 1s
+    programs/test/cpp_dummy_build
+
     msg "test: psa_constant_names (full config, clang)" # ~ 1s
     tests/scripts/test_psa_constant_names.py
 
@@ -1842,15 +1845,6 @@
     tests/scripts/depends.py pkalgs
 }
 
-component_test_make_cxx () {
-    msg "build: Unix make, full, gcc + g++"
-    scripts/config.py full
-    make TEST_CPP=1 lib programs
-
-    msg "test: cpp_dummy_build"
-    programs/test/cpp_dummy_build
-}
-
 component_build_module_alt () {
     msg "build: MBEDTLS_XXX_ALT" # ~30s
     scripts/config.py full
@@ -2238,25 +2232,6 @@
     make test
 }
 
-# This should be renamed to test and updated once the accelerator ECDSA code is in place and ready to test.
-component_build_psa_accel_alg_ecdsa() {
-    # full plus MBEDTLS_PSA_CRYPTO_CONFIG with PSA_WANT_ALG_ECDSA
-    # without MBEDTLS_ECDSA_C
-    # PSA_WANT_ALG_ECDSA and PSA_WANT_ALG_DETERMINISTIC_ECDSA are already
-    # set in include/psa/crypto_config.h
-    msg "build: full + MBEDTLS_PSA_CRYPTO_CONFIG + PSA_WANT_ALG_ECDSA without MBEDTLS_ECDSA_C"
-    scripts/config.py full
-    scripts/config.py set MBEDTLS_PSA_CRYPTO_CONFIG
-    scripts/config.py set MBEDTLS_PSA_CRYPTO_DRIVERS
-    scripts/config.py unset MBEDTLS_USE_PSA_CRYPTO
-    scripts/config.py unset MBEDTLS_SSL_PROTO_TLS1_3
-    scripts/config.py unset MBEDTLS_ECDSA_C
-    scripts/config.py unset MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED
-    scripts/config.py unset MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
-    # Need to define the correct symbol and include the test driver header path in order to build with the test driver
-    make CC=gcc CFLAGS="$ASAN_CFLAGS -DPSA_CRYPTO_DRIVER_TEST -DMBEDTLS_PSA_ACCEL_ALG_ECDSA -DMBEDTLS_PSA_ACCEL_ALG_DETERMINISTIC_ECDSA -I../tests/include -O2" LDFLAGS="$ASAN_CFLAGS"
-}
-
 # This should be renamed to test and updated once the accelerator ECDH code is in place and ready to test.
 component_build_psa_accel_alg_ecdh() {
     # full plus MBEDTLS_PSA_CRYPTO_CONFIG with PSA_WANT_ALG_ECDH
@@ -3248,8 +3223,8 @@
     msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3, without MBEDTLS_SSL_PROTO_TLS1_2"
     make CFLAGS="'-DMBEDTLS_USER_CONFIG_FILE=\"../tests/configs/tls13-only.h\"'"
 
-    msg "test_suite_ssl: TLS 1.3 only, all key exchange modes enabled"
-    cd tests; ./test_suite_ssl; cd ..
+    msg "test: TLS 1.3 only, all key exchange modes enabled"
+    make test
 
     msg "ssl-opt.sh: TLS 1.3 only, all key exchange modes enabled"
     tests/ssl-opt.sh
@@ -3334,18 +3309,6 @@
     tests/ssl-opt.sh
 }
 
-component_test_tls13_only_with_hooks () {
-    msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 and MBEDTLS_TEST_HOOKS, without MBEDTLS_SSL_PROTO_TLS1_2"
-    scripts/config.py set MBEDTLS_TEST_HOOKS
-    make CFLAGS="'-DMBEDTLS_USER_CONFIG_FILE=\"../tests/configs/tls13-only.h\"'"
-
-    msg "test: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, without MBEDTLS_SSL_PROTO_TLS1_2"
-    if_build_succeeded make test
-
-    msg "ssl-opt.sh (TLS 1.3)"
-    if_build_succeeded tests/ssl-opt.sh
-}
-
 component_test_tls13 () {
     msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, without padding"
     scripts/config.py set MBEDTLS_SSL_PROTO_TLS1_3
@@ -3372,46 +3335,6 @@
     tests/ssl-opt.sh
 }
 
-component_test_tls13_with_padding () {
-    msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with padding"
-    scripts/config.py set MBEDTLS_SSL_PROTO_TLS1_3
-    scripts/config.py set MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
-    scripts/config.py set MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY 16
-    CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make
-    msg "test: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with padding"
-    make test
-    msg "ssl-opt.sh (TLS 1.3 with padding)"
-    tests/ssl-opt.sh
-}
-
-component_test_tls13_with_ecp_restartable () {
-    msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with ecp_restartable"
-    scripts/config.py set MBEDTLS_SSL_PROTO_TLS1_3
-    scripts/config.py set MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
-    scripts/config.py set MBEDTLS_ECP_RESTARTABLE
-    CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make
-    msg "test: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with ecp_restartable"
-    make test
-    msg "ssl-opt.sh (TLS 1.3 with ecp_restartable)"
-    tests/ssl-opt.sh
-}
-
-component_test_tls13_with_everest () {
-    msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with Everest"
-    scripts/config.py set MBEDTLS_SSL_PROTO_TLS1_3
-    scripts/config.py set MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE
-    scripts/config.py set MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED
-    scripts/config.py unset MBEDTLS_ECP_RESTARTABLE
-    CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make
-    msg "test: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, with Everest"
-    make test
-    msg "ssl-opt.sh (TLS 1.3 with everest)"
-    tests/ssl-opt.sh
-}
-
 component_build_mingw () {
     msg "build: Windows cross build - mingw64, make (Link Library)" # ~ 30s
     make CC=i686-w64-mingw32-gcc AR=i686-w64-mingw32-ar LD=i686-w64-minggw32-ld CFLAGS='-Werror -Wall -Wextra' WINDOWS_BUILD=1 lib programs
diff --git a/tests/suites/test_suite_x509write.data b/tests/suites/test_suite_x509write.data
index 1844e5c..8411557 100644
--- a/tests/suites/test_suite_x509write.data
+++ b/tests/suites/test_suite_x509write.data
@@ -56,87 +56,95 @@
 
 Certificate write check Server1 SHA1
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"data_files/server1.crt":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"data_files/server1.crt":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, not before 1970
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, not after 2050
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, not before 1970, not after 2050
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"19700210144406":"20500210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, not before 2050, not after 2059
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20500210144406":"20590210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20500210144406":"20590210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, key_usage
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:0:0:1:-1:"data_files/server1.key_usage.crt":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:"NULL":0:0:1:-1:"data_files/server1.key_usage.crt":0:0:"data_files/test-ca.crt"
+
+Certificate write check Server1 SHA1, one ext_key_usage
+depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20110212144406":"20210212144406":MBEDTLS_MD_SHA1:0:0:"serverAuth":0:0:1:-1:"data_files/server1.key_ext_usage.crt":0:0:"data_files/test-ca.crt"
+
+Certificate write check Server1 SHA1, two ext_key_usages
+depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20110212144406":"20210212144406":MBEDTLS_MD_SHA1:0:0:"codeSigning,timeStamping":0:0:1:-1:"data_files/server1.key_ext_usages.crt":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, ns_cert_type
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:1:-1:"data_files/server1.cert_type.crt":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:1:-1:"data_files/server1.cert_type.crt":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, version 1
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":0:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":0:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, CA
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"data_files/server1.ca.crt":0:1:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"data_files/server1.ca.crt":0:1:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, RSA_ALT
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:0:-1:"data_files/server1.noauthid.crt":1:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:0:-1:"data_files/server1.noauthid.crt":1:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, RSA_ALT, key_usage
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:0:0:0:-1:"data_files/server1.key_usage_noauthid.crt":1:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:"NULL":0:0:0:-1:"data_files/server1.key_usage_noauthid.crt":1:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, RSA_ALT, ns_cert_type
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:0:-1:"data_files/server1.cert_type_noauthid.crt":1:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:0:-1:"data_files/server1.cert_type_noauthid.crt":1:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, RSA_ALT, version 1
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:0:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":1:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:0:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":1:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, RSA_ALT, CA
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:0:-1:"data_files/server1.ca_noauthid.crt":1:1:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:0:-1:"data_files/server1.ca_noauthid.crt":1:1:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, Opaque
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"data_files/server1.crt":2:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"data_files/server1.crt":2:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, Opaque, key_usage
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:0:0:1:-1:"data_files/server1.key_usage.crt":2:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:MBEDTLS_X509_KU_DIGITAL_SIGNATURE | MBEDTLS_X509_KU_NON_REPUDIATION | MBEDTLS_X509_KU_KEY_ENCIPHERMENT:1:"NULL":0:0:1:-1:"data_files/server1.key_usage.crt":2:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, Opaque, ns_cert_type
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:1:-1:"data_files/server1.cert_type.crt":2:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER:1:1:-1:"data_files/server1.cert_type.crt":2:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, Opaque, version 1
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":2:0:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:MBEDTLS_X509_CRT_VERSION_1:"data_files/server1.v1.crt":2:0:"data_files/test-ca.crt"
 
 Certificate write check Server1 SHA1, Opaque, CA
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC:MBEDTLS_HAS_ALG_MD5_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:0:0:1:-1:"data_files/server1.ca.crt":2:1:"data_files/test-ca.crt"
+x509_crt_check:"data_files/server1.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=PolarSSL Test CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA1:0:0:"NULL":0:0:1:-1:"data_files/server1.ca.crt":2:1:"data_files/test-ca.crt"
 
 Certificate write check Server5 ECDSA
 depends_on:MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_ECDSA_C:MBEDTLS_ECDSA_DETERMINISTIC:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_ECP_DP_SECP256R1_ENABLED
-x509_crt_check:"data_files/server5.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca2.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=Polarssl Test EC CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA256:0:0:0:0:1:-1:"data_files/server5.crt":0:0:"data_files/test-ca2.crt"
+x509_crt_check:"data_files/server5.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca2.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=Polarssl Test EC CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA256:0:0:"NULL":0:0:1:-1:"data_files/server5.crt":0:0:"data_files/test-ca2.crt"
 
 Certificate write check Server5 ECDSA, Opaque
 depends_on:MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA:MBEDTLS_ECDSA_C:MBEDTLS_ECDSA_DETERMINISTIC:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_USE_PSA_CRYPTO
-x509_crt_check:"data_files/server5.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca2.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=Polarssl Test EC CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA256:0:0:0:0:1:-1:"":2:0:"data_files/test-ca2.crt"
+x509_crt_check:"data_files/server5.key":"":"C=NL,O=PolarSSL,CN=PolarSSL Server 1":"data_files/test-ca2.key":"PolarSSLTest":"C=NL,O=PolarSSL,CN=Polarssl Test EC CA":"1":"20190210144406":"20290210144406":MBEDTLS_MD_SHA256:0:0:"NULL":0:0:1:-1:"":2:0:"data_files/test-ca2.crt"
 
 X509 String to Names #1
 mbedtls_x509_string_to_names:"C=NL,O=Offspark\, Inc., OU=PolarSSL":"C=NL, O=Offspark\, Inc., OU=PolarSSL":0
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 5caf143..aa54072 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -241,6 +241,7 @@
                      char *issuer_pwd, char *issuer_name,
                      char *serial_str, char *not_before, char *not_after,
                      int md_type, int key_usage, int set_key_usage,
+                     char *ext_key_usage,
                      int cert_type, int set_cert_type, int auth_ident,
                      int ver, char *cert_check_file, int pk_wrap, int is_ca,
                      char *cert_verify_file )
@@ -349,6 +350,31 @@
             TEST_ASSERT( mbedtls_x509write_crt_set_key_usage( &crt, key_usage ) == 0 );
         if( set_cert_type != 0 )
             TEST_ASSERT( mbedtls_x509write_crt_set_ns_cert_type( &crt, cert_type ) == 0 );
+        if( strcmp( ext_key_usage, "NULL" ) != 0 )
+        {
+            mbedtls_asn1_sequence exts[2];
+            memset( exts, 0, sizeof(exts) );
+
+#define SET_OID(x, oid)                \
+    do {                               \
+        x.len = MBEDTLS_OID_SIZE(oid); \
+        x.p   = (unsigned char*)oid;   \
+        x.tag = MBEDTLS_ASN1_OID;      \
+    }                                  \
+    while( 0 )
+
+            if( strcmp( ext_key_usage, "serverAuth" ) == 0 )
+            {
+                SET_OID( exts[0].buf, MBEDTLS_OID_SERVER_AUTH );
+            }
+            else if( strcmp( ext_key_usage, "codeSigning,timeStamping" ) == 0 )
+            {
+                SET_OID( exts[0].buf, MBEDTLS_OID_CODE_SIGNING );
+                exts[0].next = &exts[1];
+                SET_OID( exts[1].buf, MBEDTLS_OID_TIME_STAMPING );
+            }
+            TEST_ASSERT( mbedtls_x509write_crt_set_ext_key_usage( &crt, exts ) == 0 );
+        }
     }
 
     ret = mbedtls_x509write_crt_pem( &crt, buf, sizeof( buf ),