diff --git a/ChangeLog.d/X509Parse_SignatureKeyId_AuthorityKeyId.txt b/ChangeLog.d/X509Parse_SignatureKeyId_AuthorityKeyId.txt
new file mode 100644
index 0000000..9aa3ff9
--- /dev/null
+++ b/ChangeLog.d/X509Parse_SignatureKeyId_AuthorityKeyId.txt
@@ -0,0 +1,3 @@
+Features
+   * When parsing X.509 certificates, support the extensions
+     SignatureKeyIdentifier and AuthorityKeyIdentifier.
diff --git a/include/mbedtls/x509.h b/include/mbedtls/x509.h
index 8dfd1f3..7faf176 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -243,6 +243,17 @@
  */
 typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
 
+/*
+ * Container for the fields of the Authority Key Identifier object
+ */
+typedef struct mbedtls_x509_authority {
+    mbedtls_x509_buf keyIdentifier;
+    mbedtls_x509_sequence authorityCertIssuer;
+    mbedtls_x509_buf authorityCertSerialNumber;
+    mbedtls_x509_buf raw;
+}
+mbedtls_x509_authority;
+
 /** Container for date and time (precision in seconds). */
 typedef struct mbedtls_x509_time {
     int year, mon, day;         /**< Date. */
@@ -470,6 +481,9 @@
 int mbedtls_x509_get_subject_alt_name(unsigned char **p,
                                       const unsigned char *end,
                                       mbedtls_x509_sequence *subject_alt_name);
+int mbedtls_x509_get_subject_alt_name_ext(unsigned char **p,
+                                          const unsigned char *end,
+                                          mbedtls_x509_sequence *subject_alt_name);
 int mbedtls_x509_info_subject_alt_name(char **buf, size_t *size,
                                        const mbedtls_x509_sequence
                                        *subject_alt_name,
diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index a795183..e1b4aa2 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -76,6 +76,8 @@
     mbedtls_x509_buf subject_id;        /**< Optional X.509 v2/v3 subject unique identifier. */
     mbedtls_x509_buf v3_ext;            /**< Optional X.509 v3 extensions.  */
     mbedtls_x509_sequence subject_alt_names;    /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName, uniformResourceIdentifier, DirectoryName and OtherName are listed). */
+    mbedtls_x509_buf subject_key_id;    /**< Optional X.509 v3 extension subject key identifier. */
+    mbedtls_x509_authority authority_key_id;    /**< Optional X.509 v3 extension authority key identifier. */
 
     mbedtls_x509_sequence certificate_policies; /**< Optional list of certificate policies (Only anyPolicy is printed and enforced, however the rest of the policies are still listed). */
 
@@ -559,6 +561,7 @@
 int mbedtls_x509_crt_parse_path(mbedtls_x509_crt *chain, const char *path);
 
 #endif /* MBEDTLS_FS_IO */
+
 #if !defined(MBEDTLS_X509_REMOVE_INFO)
 /**
  * \brief          Returns an informational string about the
diff --git a/library/oid.c b/library/oid.c
index 8e57fe4..f78ee85 100644
--- a/library/oid.c
+++ b/library/oid.c
@@ -319,6 +319,18 @@
         MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES,
     },
     {
+        OID_DESCRIPTOR(MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
+                       "id-ce-subjectKeyIdentifier",
+                       "Subject Key Identifier"),
+        MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER,
+    },
+    {
+        OID_DESCRIPTOR(MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
+                       "id-ce-authorityKeyIdentifier",
+                       "Authority Key Identifier"),
+        MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER,
+    },
+    {
         NULL_OID_DESCRIPTOR,
         0,
     },
diff --git a/library/x509.c b/library/x509.c
index c9524c9..5f6715a 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -1201,53 +1201,19 @@
     return 0;
 }
 
-/*
- * SubjectAltName ::= GeneralNames
+/* Check mbedtls_x509_get_subject_alt_name for detailed description.
  *
- * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
- *
- * GeneralName ::= CHOICE {
- *      otherName                       [0]     OtherName,
- *      rfc822Name                      [1]     IA5String,
- *      dNSName                         [2]     IA5String,
- *      x400Address                     [3]     ORAddress,
- *      directoryName                   [4]     Name,
- *      ediPartyName                    [5]     EDIPartyName,
- *      uniformResourceIdentifier       [6]     IA5String,
- *      iPAddress                       [7]     OCTET STRING,
- *      registeredID                    [8]     OBJECT IDENTIFIER }
- *
- * OtherName ::= SEQUENCE {
- *      type-id    OBJECT IDENTIFIER,
- *      value      [0] EXPLICIT ANY DEFINED BY type-id }
- *
- * EDIPartyName ::= SEQUENCE {
- *      nameAssigner            [0]     DirectoryString OPTIONAL,
- *      partyName               [1]     DirectoryString }
- *
- * We list all types, but use the following GeneralName types from RFC 5280:
- * "dnsName", "uniformResourceIdentifier" and "hardware_module_name"
- * of type "otherName", as defined in RFC 4108.
+ * In some cases while parsing subject alternative names the sequence tag is optional
+ * (e.g. CertSerialNumber). This function is designed to handle such case.
  */
-int mbedtls_x509_get_subject_alt_name(unsigned char **p,
-                                      const unsigned char *end,
-                                      mbedtls_x509_sequence *subject_alt_name)
+int mbedtls_x509_get_subject_alt_name_ext(unsigned char **p,
+                                          const unsigned char *end,
+                                          mbedtls_x509_sequence *subject_alt_name)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t len, tag_len;
+    size_t tag_len;
     mbedtls_asn1_sequence *cur = subject_alt_name;
 
-    /* Get main sequence tag */
-    if ((ret = mbedtls_asn1_get_tag(p, end, &len,
-                                    MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
-        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
-    }
-
-    if (*p + len != end) {
-        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
-                                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
-    }
-
     while (*p < end) {
         mbedtls_x509_subject_alternative_name dummy_san_buf;
         mbedtls_x509_buf tmp_san_buf;
@@ -1315,6 +1281,55 @@
     return 0;
 }
 
+/*
+ * SubjectAltName ::= GeneralNames
+ *
+ * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
+ *
+ * GeneralName ::= CHOICE {
+ *      otherName                       [0]     OtherName,
+ *      rfc822Name                      [1]     IA5String,
+ *      dNSName                         [2]     IA5String,
+ *      x400Address                     [3]     ORAddress,
+ *      directoryName                   [4]     Name,
+ *      ediPartyName                    [5]     EDIPartyName,
+ *      uniformResourceIdentifier       [6]     IA5String,
+ *      iPAddress                       [7]     OCTET STRING,
+ *      registeredID                    [8]     OBJECT IDENTIFIER }
+ *
+ * OtherName ::= SEQUENCE {
+ *      type-id    OBJECT IDENTIFIER,
+ *      value      [0] EXPLICIT ANY DEFINED BY type-id }
+ *
+ * EDIPartyName ::= SEQUENCE {
+ *      nameAssigner            [0]     DirectoryString OPTIONAL,
+ *      partyName               [1]     DirectoryString }
+ *
+ * We list all types, but use the following GeneralName types from RFC 5280:
+ * "dnsName", "uniformResourceIdentifier" and "hardware_module_name"
+ * of type "otherName", as defined in RFC 4108.
+ */
+int mbedtls_x509_get_subject_alt_name(unsigned char **p,
+                                      const unsigned char *end,
+                                      mbedtls_x509_sequence *subject_alt_name)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t len;
+
+    /* Get main sequence tag */
+    if ((ret = mbedtls_asn1_get_tag(p, end, &len,
+                                    MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+    }
+
+    if (*p + len != end) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
+                                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
+    }
+
+    return mbedtls_x509_get_subject_alt_name_ext(p, end, subject_alt_name);
+}
+
 int mbedtls_x509_get_ns_cert_type(unsigned char **p,
                                   const unsigned char *end,
                                   unsigned char *ns_cert_type)
diff --git a/library/x509_crt.c b/library/x509_crt.c
index 874d8f6..6d62e44 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -592,6 +592,114 @@
 }
 
 /*
+ * SubjectKeyIdentifier ::= KeyIdentifier
+ *
+ * KeyIdentifier ::= OCTET STRING
+ */
+static int x509_get_subject_key_id(unsigned char **p,
+                                   const unsigned char *end,
+                                   mbedtls_x509_buf *subject_key_id)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t len = 0u;
+
+    if ((ret = mbedtls_asn1_get_tag(p, end, &len,
+                                    MBEDTLS_ASN1_OCTET_STRING)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+    }
+
+    subject_key_id->len = len;
+    subject_key_id->tag = MBEDTLS_ASN1_OCTET_STRING;
+    subject_key_id->p = *p;
+    *p += len;
+
+    if (*p != end) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
+                                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
+    }
+
+    return 0;
+}
+
+/*
+ * AuthorityKeyIdentifier ::= SEQUENCE {
+ *        keyIdentifier [0] KeyIdentifier OPTIONAL,
+ *        authorityCertIssuer [1] GeneralNames OPTIONAL,
+ *        authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL }
+ *
+ *    KeyIdentifier ::= OCTET STRING
+ */
+static int x509_get_authority_key_id(unsigned char **p,
+                                     unsigned char *end,
+                                     mbedtls_x509_authority *authority_key_id)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t len = 0u;
+
+    if ((ret = mbedtls_asn1_get_tag(p, end, &len,
+                                    MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+    }
+
+    if (*p + len != end) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
+                                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
+    }
+
+    ret = mbedtls_asn1_get_tag(p, end, &len,
+                               MBEDTLS_ASN1_CONTEXT_SPECIFIC);
+
+    /* KeyIdentifier is an OPTIONAL field */
+    if (ret == 0) {
+        authority_key_id->keyIdentifier.len = len;
+        authority_key_id->keyIdentifier.p = *p;
+        /* Setting tag of the keyIdentfier intentionally to 0x04.
+         * Although the .keyIdentfier field is CONTEXT_SPECIFIC ([0] OPTIONAL),
+         * its tag with the content is the payload of on OCTET STRING primitive */
+        authority_key_id->keyIdentifier.tag = MBEDTLS_ASN1_OCTET_STRING;
+
+        *p += len;
+    } else if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+    }
+
+    if (*p < end) {
+        /* Getting authorityCertIssuer using the required specific class tag [1] */
+        if ((ret = mbedtls_asn1_get_tag(p, end, &len,
+                                        MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED |
+                                        1)) != 0) {
+            /* authorityCertIssuer and authorityCertSerialNumber MUST both
+               be present or both be absent. At this point we expect to have both. */
+            return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+        }
+        /* "end" also includes the CertSerialNumber field so "len" shall be used */
+        ret = mbedtls_x509_get_subject_alt_name_ext(p,
+                                                    (*p+len),
+                                                    &authority_key_id->authorityCertIssuer);
+        if (ret != 0) {
+            return ret;
+        }
+
+        /* Getting authorityCertSerialNumber using the required specific class tag [2] */
+        if ((ret = mbedtls_asn1_get_tag(p, end, &len,
+                                        MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2)) != 0) {
+            return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
+        }
+        authority_key_id->authorityCertSerialNumber.len = len;
+        authority_key_id->authorityCertSerialNumber.p = *p;
+        authority_key_id->authorityCertSerialNumber.tag = MBEDTLS_ASN1_INTEGER;
+        *p += len;
+    }
+
+    if (*p != end) {
+        return MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
+               MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
+    }
+
+    return 0;
+}
+
+/*
  * id-ce-certificatePolicies OBJECT IDENTIFIER ::=  { id-ce 32 }
  *
  * anyPolicy OBJECT IDENTIFIER ::= { id-ce-certificatePolicies 0 }
@@ -889,8 +997,25 @@
                 }
                 break;
 
+            case MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER:
+                /* Parse subject key identifier */
+                if ((ret = x509_get_subject_key_id(p, end_ext_data,
+                                                   &crt->subject_key_id)) != 0) {
+                    return ret;
+                }
+                break;
+
+            case MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER:
+                /* Parse authority key identifier */
+                if ((ret = x509_get_authority_key_id(p, end_ext_octet,
+                                                     &crt->authority_key_id)) != 0) {
+                    return ret;
+                }
+                break;
             case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
-                /* Parse subject alt name */
+                /* Parse subject alt name
+                 * SubjectAltName ::= GeneralNames
+                 */
                 if ((ret = mbedtls_x509_get_subject_alt_name(p, end_ext_octet,
                                                              &crt->subject_alt_names)) != 0) {
                     return ret;
@@ -1550,6 +1675,27 @@
 #endif /* MBEDTLS_FS_IO */
 
 #if !defined(MBEDTLS_X509_REMOVE_INFO)
+#define PRINT_ITEM(i)                               \
+    do {                                            \
+        ret = mbedtls_snprintf(p, n, "%s" i, sep);  \
+        MBEDTLS_X509_SAFE_SNPRINTF;                 \
+        sep = ", ";                                 \
+    } while (0)
+
+#define CERT_TYPE(type, name)          \
+    do {                               \
+        if (ns_cert_type & (type)) {   \
+            PRINT_ITEM(name);          \
+        }                              \
+    } while (0)
+
+#define KEY_USAGE(code, name)      \
+    do {                           \
+        if (key_usage & (code)) {  \
+            PRINT_ITEM(name);      \
+        }                          \
+    } while (0)
+
 static int x509_info_ext_key_usage(char **buf, size_t *size,
                                    const mbedtls_x509_sequence *extended_key_usage)
 {
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 7cfcc9b..5f8bea9 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -73,7 +73,7 @@
 
 /* Size of memory to be allocated for the heap, when using the library's memory
  * management and MBEDTLS_MEMORY_BUFFER_ALLOC_C is enabled. */
-#define MEMORY_HEAP_SIZE        120000
+#define MEMORY_HEAP_SIZE        180000
 
 #define DFL_SERVER_ADDR         NULL
 #define DFL_SERVER_PORT         "4433"
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index db2fe56..55ed0c5 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -3278,3 +3278,39 @@
 X509 ext types accessor: ext type not present
 depends_on:MBEDTLS_X509_CRT_PARSE_C
 x509_accessor_ext_types:MBEDTLS_X509_EXT_KEY_USAGE:MBEDTLS_X509_EXT_SUBJECT_ALT_NAME
+
+X509 CRT parse Subject Key Id - Correct Subject Key ID
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_subjectkeyid:"308203873082026fa003020102020100300d06092a864886f70d0101050500303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341301e170d3131303231323134343430305a170d3231303231323134343430305a303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c205465737420434130820122300d06092a864886f70d01010105000382010f003082010a0282010100c0df37fc17bbe0969d3f86de96327d44a516a0cd21f199d4eceacb7c18580894a5ec9bc58bdf1a1e993899871e7bc08d39df385d707807d39ed993e8b97251c5cea33052a9f2e7407014cb44a2720bc2e540f93ee5a60eb3f9ec4a63c0b82900749c573ba8a5049071f1bd83d93fd6a5e23c2a8fef2760c3c69fcbbaec607db7e68432be4ffb582622035bd4b4d5fbf5e3962e70c0e42ebdfc2eeee24155c0342e7d247269cb47b11440837d67f486f631abf179a4b2b52e12f98417f0626f273e1358b1540d219a7337a130cf6f92dcf6e9fcacdb2e28d17e024b23a015f238656409ea0c6e8e1b17a071c8b39bc9abe9c3f2cf87968f8002329e99586fa2d50203010001a38195308192300c0603551d13040530030101ff301d0603551d0e04160414b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdff30630603551d23045c305a8014b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdffa13fa43d303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341820100300d06092a864886f70d01010505000382010100b8fd54d80054908b25b027dd95cda2f784071d87894ac47811d807b5d722508e48eb627a3289be634753ffb6bef12e8c54c0993fa0b93723725f0d46598fd847cd974c9f070c1262093a24e436d9e92cda38d0737561d7c16c268b9be0d5dc67ed8c6b33d774223c4cdbb58d2ace2c0d0859050905a6399fb3671be283e5e18f53f66793c7f96f76445812e83ad497e7e9c03ea87a723d87531fe52c8484e79a9e7f66d91f9bf51348b04d14d1deb224d9787df535cc5819d1d299ef4d73f81f89d45ad052ce09f5b146516a008e3bcc6f63010099ed9da60860cd3218d073e05871d9e5d253d78dd0cae95d2a0a0d5d55ec21501716e6064acd5edef7e0e954":20:0
+
+X509 CRT parse Subject Key Id - Wrong OCTET_STRING tag
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_subjectkeyid:"308203873082026fa003020102020100300d06092a864886f70d0101050500303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341301e170d3131303231323134343430305a170d3231303231323134343430305a303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c205465737420434130820122300d06092a864886f70d01010105000382010f003082010a0282010100c0df37fc17bbe0969d3f86de96327d44a516a0cd21f199d4eceacb7c18580894a5ec9bc58bdf1a1e993899871e7bc08d39df385d707807d39ed993e8b97251c5cea33052a9f2e7407014cb44a2720bc2e540f93ee5a60eb3f9ec4a63c0b82900749c573ba8a5049071f1bd83d93fd6a5e23c2a8fef2760c3c69fcbbaec607db7e68432be4ffb582622035bd4b4d5fbf5e3962e70c0e42ebdfc2eeee24155c0342e7d247269cb47b11440837d67f486f631abf179a4b2b52e12f98417f0626f273e1358b1540d219a7337a130cf6f92dcf6e9fcacdb2e28d17e024b23a015f238656409ea0c6e8e1b17a071c8b39bc9abe9c3f2cf87968f8002329e99586fa2d50203010001a38195308192300c0603551d13040530030101ff301d0603551d0e04160014b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdff30630603551d23045c305a8014b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdffa13fa43d303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341820100300d06092a864886f70d01010505000382010100b8fd54d80054908b25b027dd95cda2f784071d87894ac47811d807b5d722508e48eb627a3289be634753ffb6bef12e8c54c0993fa0b93723725f0d46598fd847cd974c9f070c1262093a24e436d9e92cda38d0737561d7c16c268b9be0d5dc67ed8c6b33d774223c4cdbb58d2ace2c0d0859050905a6399fb3671be283e5e18f53f66793c7f96f76445812e83ad497e7e9c03ea87a723d87531fe52c8484e79a9e7f66d91f9bf51348b04d14d1deb224d9787df535cc5819d1d299ef4d73f81f89d45ad052ce09f5b146516a008e3bcc6f63010099ed9da60860cd3218d073e05871d9e5d253d78dd0cae95d2a0a0d5d55ec21501716e6064acd5edef7e0e954":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT parse Authority Key Id - Correct Authority Key ID
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":20:"NL/PolarSSL/PolarSSL Test CA/":1:0
+
+X509 CRT parse Authority Key Id - Wrong Length
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
+
+X509 CRT parse Authority Key Id - Wrong Sequence tag
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT parse Authority Key Id - Wrong KeyId Tag
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"308203873082026fa003020102020100300d06092a864886f70d0101050500303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341301e170d3131303231323134343430305a170d3231303231323134343430305a303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c205465737420434130820122300d06092a864886f70d01010105000382010f003082010a0282010100c0df37fc17bbe0969d3f86de96327d44a516a0cd21f199d4eceacb7c18580894a5ec9bc58bdf1a1e993899871e7bc08d39df385d707807d39ed993e8b97251c5cea33052a9f2e7407014cb44a2720bc2e540f93ee5a60eb3f9ec4a63c0b82900749c573ba8a5049071f1bd83d93fd6a5e23c2a8fef2760c3c69fcbbaec607db7e68432be4ffb582622035bd4b4d5fbf5e3962e70c0e42ebdfc2eeee24155c0342e7d247269cb47b11440837d67f486f631abf179a4b2b52e12f98417f0626f273e1358b1540d219a7337a130cf6f92dcf6e9fcacdb2e28d17e024b23a015f238656409ea0c6e8e1b17a071c8b39bc9abe9c3f2cf87968f8002329e99586fa2d50203010001a38195308192300c0603551d13040530030101ff301d0603551d0e04160414b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdff30630603551d23045c305a0014b45ae4a5b3ded252f6b9d5a6950feb3ebcc7fdffa13fa43d303b310b3009060355040613024e4c3111300f060355040a1308506f6c617253534c3119301706035504031310506f6c617253534c2054657374204341820100300d06092a864886f70d01010505000382010100b8fd54d80054908b25b027dd95cda2f784071d87894ac47811d807b5d722508e48eb627a3289be634753ffb6bef12e8c54c0993fa0b93723725f0d46598fd847cd974c9f070c1262093a24e436d9e92cda38d0737561d7c16c268b9be0d5dc67ed8c6b33d774223c4cdbb58d2ace2c0d0859050905a6399fb3671be283e5e18f53f66793c7f96f76445812e83ad497e7e9c03ea87a723d87531fe52c8484e79a9e7f66d91f9bf51348b04d14d1deb224d9787df535cc5819d1d299ef4d73f81f89d45ad052ce09f5b146516a008e3bcc6f63010099ed9da60860cd3218d073e05871d9e5d253d78dd0cae95d2a0a0d5d55ec21501716e6064acd5edef7e0e954":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT parse Authority Key Id - Wrong KeyId Tag Length
+depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_INVALID_LENGTH
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 1
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT parse Authority Key Id - Wrong Issuer Tag 2
+depends_on:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"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":0:"":0:MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 73e6803..f215a80 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -1548,3 +1548,86 @@
     USE_PSA_DONE();
 }
 /* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
+void x509_crt_parse_subjectkeyid(data_t *buf, int subjectKeyIdLength_arg, int ref_ret)
+{
+    size_t subjectKeyIdLength = subjectKeyIdLength_arg;
+    mbedtls_x509_crt crt;
+
+    mbedtls_x509_crt_init(&crt);
+
+    TEST_ASSERT(mbedtls_x509_crt_parse_der(&crt, buf->x, buf->len) == ref_ret);
+
+    if (ref_ret == 0) {
+        TEST_ASSERT(crt.subject_key_id.tag == MBEDTLS_ASN1_OCTET_STRING);
+        TEST_ASSERT(crt.subject_key_id.len == subjectKeyIdLength);
+    } else {
+        TEST_ASSERT(crt.subject_key_id.tag == 0);
+        TEST_ASSERT(crt.subject_key_id.len == 0);
+    }
+
+exit:
+    mbedtls_x509_crt_free(&crt);
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
+void x509_crt_parse_authoritykeyid(data_t *buf,
+                                   int keyIdLength_arg,
+                                   char *authorityKeyId_issuer,
+                                   int serialLength_arg,
+                                   int ref_ret)
+{
+    mbedtls_x509_crt crt;
+    int bufferCounter = 0;
+    size_t issuerCounter = 0;
+    size_t keyIdLength = keyIdLength_arg;
+    size_t serialLength = serialLength_arg;
+    unsigned int result = 0;
+    mbedtls_x509_subject_alternative_name san;
+    mbedtls_x509_name *pname = NULL;
+
+    mbedtls_x509_crt_init(&crt);
+
+    TEST_ASSERT(mbedtls_x509_crt_parse_der(&crt, buf->x, buf->len) == ref_ret);
+
+    if (ref_ret == 0) {
+        /* KeyId test */
+        TEST_ASSERT(crt.authority_key_id.keyIdentifier.tag == MBEDTLS_ASN1_OCTET_STRING);
+        TEST_ASSERT(crt.authority_key_id.keyIdentifier.len == keyIdLength);
+
+        /* Issuer test */
+        mbedtls_x509_sequence *issuerPtr = &crt.authority_key_id.authorityCertIssuer;
+
+        TEST_ASSERT(mbedtls_x509_parse_subject_alt_name(&issuerPtr->buf, &san) == 0);
+
+        pname = &san.san.directory_name;
+
+        while (pname != NULL) {
+            for (issuerCounter = 0; issuerCounter < pname->val.len; issuerCounter++) {
+                result |=
+                    (authorityKeyId_issuer[bufferCounter++] != pname->val.p[issuerCounter]);
+            }
+            bufferCounter++; /* Skipping the slash */
+            pname = pname->next;
+        }
+        mbedtls_x509_free_subject_alt_name(&san);
+        TEST_ASSERT(result == 0);
+
+        /* Serial test */
+        TEST_ASSERT(crt.authority_key_id.authorityCertSerialNumber.tag ==
+                    MBEDTLS_ASN1_INTEGER);
+        TEST_ASSERT(crt.authority_key_id.authorityCertSerialNumber.len == serialLength);
+    } else {
+        TEST_ASSERT(crt.authority_key_id.keyIdentifier.tag == 0);
+        TEST_ASSERT(crt.authority_key_id.keyIdentifier.len == 0);
+
+        TEST_ASSERT(crt.authority_key_id.authorityCertSerialNumber.tag == 0);
+        TEST_ASSERT(crt.authority_key_id.authorityCertSerialNumber.len == 0);
+    }
+
+exit:
+    mbedtls_x509_crt_free(&crt);
+}
+/* END_CASE */