Apply clang formatting.

Executed with:
`find . -regextype posix-egrep -regex ".*\.([hc]|fmt|function)" | xargs -L1 clang-format-12 -i`

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/programs/x509/cert_write.c b/programs/x509/cert_write.c
index 72e823f..0be9402 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -20,211 +20,209 @@
 #include "mbedtls/build_info.h"
 
 #if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
+#    include "mbedtls/platform.h"
 #else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_printf          printf
-#define mbedtls_exit            exit
-#define MBEDTLS_EXIT_SUCCESS    EXIT_SUCCESS
-#define MBEDTLS_EXIT_FAILURE    EXIT_FAILURE
+#    include <stdio.h>
+#    include <stdlib.h>
+#    define mbedtls_printf       printf
+#    define mbedtls_exit         exit
+#    define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
+#    define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
 #endif /* MBEDTLS_PLATFORM_C */
 
-#if !defined(MBEDTLS_X509_CRT_WRITE_C) || \
+#if !defined(MBEDTLS_X509_CRT_WRITE_C) ||                            \
     !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
-    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
-    !defined(MBEDTLS_ERROR_C) || !defined(MBEDTLS_SHA256_C) || \
+    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) ||   \
+    !defined(MBEDTLS_ERROR_C) || !defined(MBEDTLS_SHA256_C) ||       \
     !defined(MBEDTLS_PEM_WRITE_C)
-int main( void )
+int main(void)
 {
-    mbedtls_printf( "MBEDTLS_X509_CRT_WRITE_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
-            "MBEDTLS_FS_IO and/or MBEDTLS_SHA256_C and/or "
-            "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
-            "MBEDTLS_ERROR_C not defined.\n");
-    mbedtls_exit( 0 );
+    mbedtls_printf(
+        "MBEDTLS_X509_CRT_WRITE_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
+        "MBEDTLS_FS_IO and/or MBEDTLS_SHA256_C and/or "
+        "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
+        "MBEDTLS_ERROR_C not defined.\n");
+    mbedtls_exit(0);
 }
 #else
 
-#include "mbedtls/x509_crt.h"
-#include "mbedtls/x509_csr.h"
-#include "mbedtls/entropy.h"
-#include "mbedtls/ctr_drbg.h"
-#include "mbedtls/md.h"
-#include "mbedtls/error.h"
+#    include "mbedtls/x509_crt.h"
+#    include "mbedtls/x509_csr.h"
+#    include "mbedtls/entropy.h"
+#    include "mbedtls/ctr_drbg.h"
+#    include "mbedtls/md.h"
+#    include "mbedtls/error.h"
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#    include <stdio.h>
+#    include <stdlib.h>
+#    include <string.h>
 
-#if defined(MBEDTLS_X509_CSR_PARSE_C)
-#define USAGE_CSR                                                           \
-    "    request_file=%%s         default: (empty)\n"                           \
-    "                            If request_file is specified, subject_key,\n"  \
-    "                            subject_pwd and subject_name are ignored!\n"
-#else
-#define USAGE_CSR ""
-#endif /* MBEDTLS_X509_CSR_PARSE_C */
+#    if defined(MBEDTLS_X509_CSR_PARSE_C)
+#        define USAGE_CSR                                                              \
+            "    request_file=%%s         default: (empty)\n"                          \
+            "                            If request_file is specified, subject_key,\n" \
+            "                            subject_pwd and subject_name are ignored!\n"
+#    else
+#        define USAGE_CSR ""
+#    endif /* MBEDTLS_X509_CSR_PARSE_C */
 
-#define DFL_ISSUER_CRT          ""
-#define DFL_REQUEST_FILE        ""
-#define DFL_SUBJECT_KEY         "subject.key"
-#define DFL_ISSUER_KEY          "ca.key"
-#define DFL_SUBJECT_PWD         ""
-#define DFL_ISSUER_PWD          ""
-#define DFL_OUTPUT_FILENAME     "cert.crt"
-#define DFL_SUBJECT_NAME        "CN=Cert,O=mbed TLS,C=UK"
-#define DFL_ISSUER_NAME         "CN=CA,O=mbed TLS,C=UK"
-#define DFL_NOT_BEFORE          "20010101000000"
-#define DFL_NOT_AFTER           "20301231235959"
-#define DFL_SERIAL              "1"
-#define DFL_SELFSIGN            0
-#define DFL_IS_CA               0
-#define DFL_MAX_PATHLEN         -1
-#define DFL_KEY_USAGE           0
-#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_ISSUER_CRT      ""
+#    define DFL_REQUEST_FILE    ""
+#    define DFL_SUBJECT_KEY     "subject.key"
+#    define DFL_ISSUER_KEY      "ca.key"
+#    define DFL_SUBJECT_PWD     ""
+#    define DFL_ISSUER_PWD      ""
+#    define DFL_OUTPUT_FILENAME "cert.crt"
+#    define DFL_SUBJECT_NAME    "CN=Cert,O=mbed TLS,C=UK"
+#    define DFL_ISSUER_NAME     "CN=CA,O=mbed TLS,C=UK"
+#    define DFL_NOT_BEFORE      "20010101000000"
+#    define DFL_NOT_AFTER       "20301231235959"
+#    define DFL_SERIAL          "1"
+#    define DFL_SELFSIGN        0
+#    define DFL_IS_CA           0
+#    define DFL_MAX_PATHLEN     -1
+#    define DFL_KEY_USAGE       0
+#    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 USAGE \
-    "\n usage: cert_write param=<>...\n"                \
-    "\n acceptable parameters:\n"                       \
-    USAGE_CSR                                           \
-    "    subject_key=%%s          default: subject.key\n"   \
-    "    subject_pwd=%%s          default: (empty)\n"       \
-    "    subject_name=%%s         default: CN=Cert,O=mbed TLS,C=UK\n"   \
-    "\n"                                                \
-    "    issuer_crt=%%s           default: (empty)\n"       \
-    "                            If issuer_crt is specified, issuer_name is\n"  \
-    "                            ignored!\n"                \
-    "    issuer_name=%%s          default: CN=CA,O=mbed TLS,C=UK\n"     \
-    "\n"                                                \
-    "    selfsign=%%d             default: 0 (false)\n"     \
-    "                            If selfsign is enabled, issuer_name and\n" \
-    "                            issuer_key are required (issuer_crt and\n" \
-    "                            subject_* are ignored\n"   \
-    "    issuer_key=%%s           default: ca.key\n"        \
-    "    issuer_pwd=%%s           default: (empty)\n"       \
-    "    output_file=%%s          default: cert.crt\n"      \
-    "    serial=%%s               default: 1\n"             \
-    "    not_before=%%s           default: 20010101000000\n"\
-    "    not_after=%%s            default: 20301231235959\n"\
-    "    is_ca=%%d                default: 0 (disabled)\n"  \
-    "    max_pathlen=%%d          default: -1 (none)\n"     \
-    "    md=%%s                   default: SHA256\n"        \
-    "                            Supported values (if enabled):\n"      \
-    "                            MD5, RIPEMD160, SHA1,\n" \
-    "                            SHA224, SHA256, SHA384, SHA512\n" \
-    "    version=%%d              default: 3\n"            \
-    "                            Possible values: 1, 2, 3\n"\
-    "    subject_identifier=%%s   default: 1\n"             \
-    "                            Possible values: 0, 1\n"   \
-    "                            (Considered for v3 only)\n"\
-    "    authority_identifier=%%s default: 1\n"             \
-    "                            Possible values: 0, 1\n"   \
-    "                            (Considered for v3 only)\n"\
-    "    basic_constraints=%%d    default: 1\n"             \
-    "                            Possible values: 0, 1\n"   \
-    "                            (Considered for v3 only)\n"\
-    "    key_usage=%%s            default: (empty)\n"       \
-    "                            Comma-separated-list of values:\n"     \
-    "                            digital_signature\n"     \
-    "                            non_repudiation\n"       \
-    "                            key_encipherment\n"      \
-    "                            data_encipherment\n"     \
-    "                            key_agreement\n"         \
-    "                            key_cert_sign\n"  \
-    "                            crl_sign\n"              \
-    "                            (Considered for v3 only)\n"\
-    "    ns_cert_type=%%s         default: (empty)\n"       \
-    "                            Comma-separated-list of values:\n"     \
-    "                            ssl_client\n"            \
-    "                            ssl_server\n"            \
-    "                            email\n"                 \
-    "                            object_signing\n"        \
-    "                            ssl_ca\n"                \
-    "                            email_ca\n"              \
-    "                            object_signing_ca\n"     \
-    "\n"
-
+#    define USAGE                                                                  \
+        "\n usage: cert_write param=<>...\n"                                       \
+        "\n acceptable parameters:\n" USAGE_CSR                                    \
+        "    subject_key=%%s          default: subject.key\n"                      \
+        "    subject_pwd=%%s          default: (empty)\n"                          \
+        "    subject_name=%%s         default: CN=Cert,O=mbed TLS,C=UK\n"          \
+        "\n"                                                                       \
+        "    issuer_crt=%%s           default: (empty)\n"                          \
+        "                            If issuer_crt is specified, issuer_name is\n" \
+        "                            ignored!\n"                                   \
+        "    issuer_name=%%s          default: CN=CA,O=mbed TLS,C=UK\n"            \
+        "\n"                                                                       \
+        "    selfsign=%%d             default: 0 (false)\n"                        \
+        "                            If selfsign is enabled, issuer_name and\n"    \
+        "                            issuer_key are required (issuer_crt and\n"    \
+        "                            subject_* are ignored\n"                      \
+        "    issuer_key=%%s           default: ca.key\n"                           \
+        "    issuer_pwd=%%s           default: (empty)\n"                          \
+        "    output_file=%%s          default: cert.crt\n"                         \
+        "    serial=%%s               default: 1\n"                                \
+        "    not_before=%%s           default: 20010101000000\n"                   \
+        "    not_after=%%s            default: 20301231235959\n"                   \
+        "    is_ca=%%d                default: 0 (disabled)\n"                     \
+        "    max_pathlen=%%d          default: -1 (none)\n"                        \
+        "    md=%%s                   default: SHA256\n"                           \
+        "                            Supported values (if enabled):\n"             \
+        "                            MD5, RIPEMD160, SHA1,\n"                      \
+        "                            SHA224, SHA256, SHA384, SHA512\n"             \
+        "    version=%%d              default: 3\n"                                \
+        "                            Possible values: 1, 2, 3\n"                   \
+        "    subject_identifier=%%s   default: 1\n"                                \
+        "                            Possible values: 0, 1\n"                      \
+        "                            (Considered for v3 only)\n"                   \
+        "    authority_identifier=%%s default: 1\n"                                \
+        "                            Possible values: 0, 1\n"                      \
+        "                            (Considered for v3 only)\n"                   \
+        "    basic_constraints=%%d    default: 1\n"                                \
+        "                            Possible values: 0, 1\n"                      \
+        "                            (Considered for v3 only)\n"                   \
+        "    key_usage=%%s            default: (empty)\n"                          \
+        "                            Comma-separated-list of values:\n"            \
+        "                            digital_signature\n"                          \
+        "                            non_repudiation\n"                            \
+        "                            key_encipherment\n"                           \
+        "                            data_encipherment\n"                          \
+        "                            key_agreement\n"                              \
+        "                            key_cert_sign\n"                              \
+        "                            crl_sign\n"                                   \
+        "                            (Considered for v3 only)\n"                   \
+        "    ns_cert_type=%%s         default: (empty)\n"                          \
+        "                            Comma-separated-list of values:\n"            \
+        "                            ssl_client\n"                                 \
+        "                            ssl_server\n"                                 \
+        "                            email\n"                                      \
+        "                            object_signing\n"                             \
+        "                            ssl_ca\n"                                     \
+        "                            email_ca\n"                                   \
+        "                            object_signing_ca\n"                          \
+        "\n"
 
 /*
  * global options
  */
-struct options
-{
-    const char *issuer_crt;     /* filename of the issuer certificate   */
-    const char *request_file;   /* filename of the certificate request  */
-    const char *subject_key;    /* filename of the subject key file     */
-    const char *issuer_key;     /* filename of the issuer key file      */
-    const char *subject_pwd;    /* password for the subject key file    */
-    const char *issuer_pwd;     /* password for the issuer key file     */
-    const char *output_file;    /* where to store the constructed CRT   */
-    const char *subject_name;   /* subject name for certificate         */
-    const char *issuer_name;    /* issuer name for certificate          */
-    const char *not_before;     /* validity period not before           */
-    const char *not_after;      /* validity period not after            */
-    const char *serial;         /* serial number string                 */
-    int selfsign;               /* selfsign the certificate             */
-    int is_ca;                  /* is a CA certificate                  */
-    int max_pathlen;            /* maximum CA path length               */
-    int authority_identifier;   /* add authority identifier to CRT      */
-    int subject_identifier;     /* add subject identifier to CRT        */
-    int basic_constraints;      /* add basic constraints ext to CRT     */
-    int version;                /* CRT version                          */
-    mbedtls_md_type_t md;       /* Hash used for signing                */
-    unsigned char key_usage;    /* key usage flags                      */
+struct options {
+    const char *issuer_crt; /* filename of the issuer certificate   */
+    const char *request_file; /* filename of the certificate request  */
+    const char *subject_key; /* filename of the subject key file     */
+    const char *issuer_key; /* filename of the issuer key file      */
+    const char *subject_pwd; /* password for the subject key file    */
+    const char *issuer_pwd; /* password for the issuer key file     */
+    const char *output_file; /* where to store the constructed CRT   */
+    const char *subject_name; /* subject name for certificate         */
+    const char *issuer_name; /* issuer name for certificate          */
+    const char *not_before; /* validity period not before           */
+    const char *not_after; /* validity period not after            */
+    const char *serial; /* serial number string                 */
+    int selfsign; /* selfsign the certificate             */
+    int is_ca; /* is a CA certificate                  */
+    int max_pathlen; /* maximum CA path length               */
+    int authority_identifier; /* add authority identifier to CRT      */
+    int subject_identifier; /* add subject identifier to CRT        */
+    int basic_constraints; /* add basic constraints ext to CRT     */
+    int version; /* CRT version                          */
+    mbedtls_md_type_t md; /* Hash used for signing                */
+    unsigned char key_usage; /* key usage flags                      */
     unsigned char ns_cert_type; /* NS cert type                         */
 } opt;
 
-int write_certificate( mbedtls_x509write_cert *crt, const char *output_file,
-                       int (*f_rng)(void *, unsigned char *, size_t),
-                       void *p_rng )
+int write_certificate(mbedtls_x509write_cert *crt,
+                      const char *output_file,
+                      int (*f_rng)(void *, unsigned char *, size_t),
+                      void *p_rng)
 {
     int ret;
     FILE *f;
     unsigned char output_buf[4096];
     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 ;
+    memset(output_buf, 0, 4096);
+    if ((ret = mbedtls_x509write_crt_pem(crt, output_buf, 4096, f_rng, p_rng)) <
+        0)
+        return ret;
 
-    len = strlen( (char *) output_buf );
+    len = strlen((char *)output_buf);
 
-    if( ( f = fopen( output_file, "w" ) ) == NULL )
-        return -1 ;
+    if ((f = fopen(output_file, "w")) == NULL)
+        return -1;
 
-    if( fwrite( output_buf, 1, len, f ) != len )
-    {
-        fclose( f );
-        return -1 ;
+    if (fwrite(output_buf, 1, len, f) != len) {
+        fclose(f);
+        return -1;
     }
 
-    fclose( f );
+    fclose(f);
 
-    return 0 ;
+    return 0;
 }
 
-int main( int argc, char *argv[] )
+int main(int argc, char *argv[])
 {
     int ret = 1;
     int exit_code = MBEDTLS_EXIT_FAILURE;
     mbedtls_x509_crt issuer_crt;
     mbedtls_pk_context loaded_issuer_key, loaded_subject_key;
     mbedtls_pk_context *issuer_key = &loaded_issuer_key,
-                *subject_key = &loaded_subject_key;
+                       *subject_key = &loaded_subject_key;
     char buf[1024];
     char issuer_name[256];
     int i;
     char *p, *q, *r;
-#if defined(MBEDTLS_X509_CSR_PARSE_C)
+#    if defined(MBEDTLS_X509_CSR_PARSE_C)
     char subject_name[256];
     mbedtls_x509_csr csr;
-#endif
+#    endif
     mbedtls_x509write_cert crt;
     mbedtls_mpi serial;
     mbedtls_entropy_context entropy;
@@ -234,229 +232,183 @@
     /*
      * Set to sane values
      */
-    mbedtls_x509write_crt_init( &crt );
-    mbedtls_pk_init( &loaded_issuer_key );
-    mbedtls_pk_init( &loaded_subject_key );
-    mbedtls_mpi_init( &serial );
-    mbedtls_ctr_drbg_init( &ctr_drbg );
-    mbedtls_entropy_init( &entropy );
-#if defined(MBEDTLS_X509_CSR_PARSE_C)
-    mbedtls_x509_csr_init( &csr );
-#endif
-    mbedtls_x509_crt_init( &issuer_crt );
-    memset( buf, 0, 1024 );
+    mbedtls_x509write_crt_init(&crt);
+    mbedtls_pk_init(&loaded_issuer_key);
+    mbedtls_pk_init(&loaded_subject_key);
+    mbedtls_mpi_init(&serial);
+    mbedtls_ctr_drbg_init(&ctr_drbg);
+    mbedtls_entropy_init(&entropy);
+#    if defined(MBEDTLS_X509_CSR_PARSE_C)
+    mbedtls_x509_csr_init(&csr);
+#    endif
+    mbedtls_x509_crt_init(&issuer_crt);
+    memset(buf, 0, 1024);
 
-    if( argc == 0 )
-    {
-    usage:
-        mbedtls_printf( USAGE );
+    if (argc == 0) {
+usage:
+        mbedtls_printf(USAGE);
         goto exit;
     }
 
-    opt.issuer_crt          = DFL_ISSUER_CRT;
-    opt.request_file        = DFL_REQUEST_FILE;
-    opt.subject_key         = DFL_SUBJECT_KEY;
-    opt.issuer_key          = DFL_ISSUER_KEY;
-    opt.subject_pwd         = DFL_SUBJECT_PWD;
-    opt.issuer_pwd          = DFL_ISSUER_PWD;
-    opt.output_file         = DFL_OUTPUT_FILENAME;
-    opt.subject_name        = DFL_SUBJECT_NAME;
-    opt.issuer_name         = DFL_ISSUER_NAME;
-    opt.not_before          = DFL_NOT_BEFORE;
-    opt.not_after           = DFL_NOT_AFTER;
-    opt.serial              = DFL_SERIAL;
-    opt.selfsign            = DFL_SELFSIGN;
-    opt.is_ca               = DFL_IS_CA;
-    opt.max_pathlen         = DFL_MAX_PATHLEN;
-    opt.key_usage           = DFL_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.issuer_crt = DFL_ISSUER_CRT;
+    opt.request_file = DFL_REQUEST_FILE;
+    opt.subject_key = DFL_SUBJECT_KEY;
+    opt.issuer_key = DFL_ISSUER_KEY;
+    opt.subject_pwd = DFL_SUBJECT_PWD;
+    opt.issuer_pwd = DFL_ISSUER_PWD;
+    opt.output_file = DFL_OUTPUT_FILENAME;
+    opt.subject_name = DFL_SUBJECT_NAME;
+    opt.issuer_name = DFL_ISSUER_NAME;
+    opt.not_before = DFL_NOT_BEFORE;
+    opt.not_after = DFL_NOT_AFTER;
+    opt.serial = DFL_SERIAL;
+    opt.selfsign = DFL_SELFSIGN;
+    opt.is_ca = DFL_IS_CA;
+    opt.max_pathlen = DFL_MAX_PATHLEN;
+    opt.key_usage = DFL_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.basic_constraints = DFL_CONSTRAINTS;
 
-    for( i = 1; i < argc; i++ )
-    {
-
+    for (i = 1; i < argc; i++) {
         p = argv[i];
-        if( ( q = strchr( p, '=' ) ) == NULL )
+        if ((q = strchr(p, '=')) == NULL)
             goto usage;
         *q++ = '\0';
 
-        if( strcmp( p, "request_file" ) == 0 )
+        if (strcmp(p, "request_file") == 0)
             opt.request_file = q;
-        else if( strcmp( p, "subject_key" ) == 0 )
+        else if (strcmp(p, "subject_key") == 0)
             opt.subject_key = q;
-        else if( strcmp( p, "issuer_key" ) == 0 )
+        else if (strcmp(p, "issuer_key") == 0)
             opt.issuer_key = q;
-        else if( strcmp( p, "subject_pwd" ) == 0 )
+        else if (strcmp(p, "subject_pwd") == 0)
             opt.subject_pwd = q;
-        else if( strcmp( p, "issuer_pwd" ) == 0 )
+        else if (strcmp(p, "issuer_pwd") == 0)
             opt.issuer_pwd = q;
-        else if( strcmp( p, "issuer_crt" ) == 0 )
+        else if (strcmp(p, "issuer_crt") == 0)
             opt.issuer_crt = q;
-        else if( strcmp( p, "output_file" ) == 0 )
+        else if (strcmp(p, "output_file") == 0)
             opt.output_file = q;
-        else if( strcmp( p, "subject_name" ) == 0 )
-        {
+        else if (strcmp(p, "subject_name") == 0) {
             opt.subject_name = q;
-        }
-        else if( strcmp( p, "issuer_name" ) == 0 )
-        {
+        } else if (strcmp(p, "issuer_name") == 0) {
             opt.issuer_name = q;
-        }
-        else if( strcmp( p, "not_before" ) == 0 )
-        {
+        } else if (strcmp(p, "not_before") == 0) {
             opt.not_before = q;
-        }
-        else if( strcmp( p, "not_after" ) == 0 )
-        {
+        } else if (strcmp(p, "not_after") == 0) {
             opt.not_after = q;
-        }
-        else if( strcmp( p, "serial" ) == 0 )
-        {
+        } else if (strcmp(p, "serial") == 0) {
             opt.serial = q;
-        }
-        else if( strcmp( p, "authority_identifier" ) == 0 )
-        {
-            opt.authority_identifier = atoi( q );
-            if( opt.authority_identifier != 0 &&
-                opt.authority_identifier != 1 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "authority_identifier") == 0) {
+            opt.authority_identifier = atoi(q);
+            if (opt.authority_identifier != 0 &&
+                opt.authority_identifier != 1) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "subject_identifier" ) == 0 )
-        {
-            opt.subject_identifier = atoi( q );
-            if( opt.subject_identifier != 0 &&
-                opt.subject_identifier != 1 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "subject_identifier") == 0) {
+            opt.subject_identifier = atoi(q);
+            if (opt.subject_identifier != 0 && opt.subject_identifier != 1) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "basic_constraints" ) == 0 )
-        {
-            opt.basic_constraints = atoi( q );
-            if( opt.basic_constraints != 0 &&
-                opt.basic_constraints != 1 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "basic_constraints") == 0) {
+            opt.basic_constraints = atoi(q);
+            if (opt.basic_constraints != 0 && opt.basic_constraints != 1) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "md" ) == 0 )
-        {
-            const mbedtls_md_info_t *md_info =
-                mbedtls_md_info_from_string( q );
-            if( md_info == NULL )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "md") == 0) {
+            const mbedtls_md_info_t *md_info = mbedtls_md_info_from_string(q);
+            if (md_info == NULL) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-            opt.md = mbedtls_md_get_type( md_info );
-        }
-        else if( strcmp( p, "version" ) == 0 )
-        {
-            opt.version = atoi( q );
-            if( opt.version < 1 || opt.version > 3 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+            opt.md = mbedtls_md_get_type(md_info);
+        } else if (strcmp(p, "version") == 0) {
+            opt.version = atoi(q);
+            if (opt.version < 1 || opt.version > 3) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
             opt.version--;
-        }
-        else if( strcmp( p, "selfsign" ) == 0 )
-        {
-            opt.selfsign = atoi( q );
-            if( opt.selfsign < 0 || opt.selfsign > 1 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "selfsign") == 0) {
+            opt.selfsign = atoi(q);
+            if (opt.selfsign < 0 || opt.selfsign > 1) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "is_ca" ) == 0 )
-        {
-            opt.is_ca = atoi( q );
-            if( opt.is_ca < 0 || opt.is_ca > 1 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "is_ca") == 0) {
+            opt.is_ca = atoi(q);
+            if (opt.is_ca < 0 || opt.is_ca > 1) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "max_pathlen" ) == 0 )
-        {
-            opt.max_pathlen = atoi( q );
-            if( opt.max_pathlen < -1 || opt.max_pathlen > 127 )
-            {
-                mbedtls_printf( "Invalid argument for option %s\n", p );
+        } else if (strcmp(p, "max_pathlen") == 0) {
+            opt.max_pathlen = atoi(q);
+            if (opt.max_pathlen < -1 || opt.max_pathlen > 127) {
+                mbedtls_printf("Invalid argument for option %s\n", p);
                 goto usage;
             }
-        }
-        else if( strcmp( p, "key_usage" ) == 0 )
-        {
-            while( q != NULL )
-            {
-                if( ( r = strchr( q, ',' ) ) != NULL )
+        } else if (strcmp(p, "key_usage") == 0) {
+            while (q != NULL) {
+                if ((r = strchr(q, ',')) != NULL)
                     *r++ = '\0';
 
-                if( strcmp( q, "digital_signature" ) == 0 )
+                if (strcmp(q, "digital_signature") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
-                else if( strcmp( q, "non_repudiation" ) == 0 )
+                else if (strcmp(q, "non_repudiation") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION;
-                else if( strcmp( q, "key_encipherment" ) == 0 )
+                else if (strcmp(q, "key_encipherment") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
-                else if( strcmp( q, "data_encipherment" ) == 0 )
+                else if (strcmp(q, "data_encipherment") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT;
-                else if( strcmp( q, "key_agreement" ) == 0 )
+                else if (strcmp(q, "key_agreement") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT;
-                else if( strcmp( q, "key_cert_sign" ) == 0 )
+                else if (strcmp(q, "key_cert_sign") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN;
-                else if( strcmp( q, "crl_sign" ) == 0 )
+                else if (strcmp(q, "crl_sign") == 0)
                     opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN;
-                else
-                {
-                    mbedtls_printf( "Invalid argument for option %s\n", p );
+                else {
+                    mbedtls_printf("Invalid argument for option %s\n", p);
                     goto usage;
                 }
 
                 q = r;
             }
-        }
-        else if( strcmp( p, "ns_cert_type" ) == 0 )
-        {
-            while( q != NULL )
-            {
-                if( ( r = strchr( q, ',' ) ) != NULL )
+        } else if (strcmp(p, "ns_cert_type") == 0) {
+            while (q != NULL) {
+                if ((r = strchr(q, ',')) != NULL)
                     *r++ = '\0';
 
-                if( strcmp( q, "ssl_client" ) == 0 )
+                if (strcmp(q, "ssl_client") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT;
-                else if( strcmp( q, "ssl_server" ) == 0 )
+                else if (strcmp(q, "ssl_server") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER;
-                else if( strcmp( q, "email" ) == 0 )
+                else if (strcmp(q, "email") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL;
-                else if( strcmp( q, "object_signing" ) == 0 )
-                    opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
-                else if( strcmp( q, "ssl_ca" ) == 0 )
+                else if (strcmp(q, "object_signing") == 0)
+                    opt.ns_cert_type |=
+                        MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING;
+                else if (strcmp(q, "ssl_ca") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA;
-                else if( strcmp( q, "email_ca" ) == 0 )
+                else if (strcmp(q, "email_ca") == 0)
                     opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA;
-                else if( strcmp( q, "object_signing_ca" ) == 0 )
-                    opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
-                else
-                {
-                    mbedtls_printf( "Invalid argument for option %s\n", p );
+                else if (strcmp(q, "object_signing_ca") == 0)
+                    opt.ns_cert_type |=
+                        MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA;
+                else {
+                    mbedtls_printf("Invalid argument for option %s\n", p);
                     goto usage;
                 }
 
                 q = r;
             }
-        }
-        else
+        } else
             goto usage;
     }
 
@@ -465,341 +417,332 @@
     /*
      * 0. Seed the PRNG
      */
-    mbedtls_printf( "  . Seeding the random number generator..." );
-    fflush( stdout );
+    mbedtls_printf("  . Seeding the random number generator...");
+    fflush(stdout);
 
-    if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
-                               (const unsigned char *) pers,
-                               strlen( pers ) ) ) != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_ctr_drbg_seed returned %d - %s\n",
-                        ret, buf );
+    if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
+                                     (const unsigned char *)pers,
+                                     strlen(pers))) != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_ctr_drbg_seed returned %d - %s\n",
+                       ret, buf);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     // Parse serial to MPI
     //
-    mbedtls_printf( "  . Reading serial number..." );
-    fflush( stdout );
+    mbedtls_printf("  . Reading serial number...");
+    fflush(stdout);
 
-    if( ( ret = mbedtls_mpi_read_string( &serial, 10, opt.serial ) ) != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_mpi_read_string "
-                        "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+    if ((ret = mbedtls_mpi_read_string(&serial, 10, opt.serial)) != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_mpi_read_string "
+                       "returned -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     // Parse issuer certificate if present
     //
-    if( !opt.selfsign && strlen( opt.issuer_crt ) )
-    {
+    if (!opt.selfsign && strlen(opt.issuer_crt)) {
         /*
          * 1.0.a. Load the certificates
          */
-        mbedtls_printf( "  . Loading the issuer certificate ..." );
-        fflush( stdout );
+        mbedtls_printf("  . Loading the issuer certificate ...");
+        fflush(stdout);
 
-        if( ( ret = mbedtls_x509_crt_parse_file( &issuer_crt, opt.issuer_crt ) ) != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509_crt_parse_file "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        if ((ret = mbedtls_x509_crt_parse_file(&issuer_crt, opt.issuer_crt)) !=
+            0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse_file "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        ret = mbedtls_x509_dn_gets( issuer_name, sizeof(issuer_name),
-                                 &issuer_crt.MBEDTLS_PRIVATE(subject) );
-        if( ret < 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509_dn_gets "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_x509_dn_gets(issuer_name, sizeof(issuer_name),
+                                   &issuer_crt.MBEDTLS_PRIVATE(subject));
+        if (ret < 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509_dn_gets "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
         opt.issuer_name = issuer_name;
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
-#if defined(MBEDTLS_X509_CSR_PARSE_C)
+#    if defined(MBEDTLS_X509_CSR_PARSE_C)
     // Parse certificate request if present
     //
-    if( !opt.selfsign && strlen( opt.request_file ) )
-    {
+    if (!opt.selfsign && strlen(opt.request_file)) {
         /*
          * 1.0.b. Load the CSR
          */
-        mbedtls_printf( "  . Loading the certificate request ..." );
-        fflush( stdout );
+        mbedtls_printf("  . Loading the certificate request ...");
+        fflush(stdout);
 
-        if( ( ret = mbedtls_x509_csr_parse_file( &csr, opt.request_file ) ) != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509_csr_parse_file "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        if ((ret = mbedtls_x509_csr_parse_file(&csr, opt.request_file)) != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509_csr_parse_file "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        ret = mbedtls_x509_dn_gets( subject_name, sizeof(subject_name),
-                                 &csr.MBEDTLS_PRIVATE(subject) );
-        if( ret < 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509_dn_gets "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_x509_dn_gets(subject_name, sizeof(subject_name),
+                                   &csr.MBEDTLS_PRIVATE(subject));
+        if (ret < 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509_dn_gets "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
         opt.subject_name = subject_name;
         subject_key = &csr.MBEDTLS_PRIVATE(pk);
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
-#endif /* MBEDTLS_X509_CSR_PARSE_C */
+#    endif /* MBEDTLS_X509_CSR_PARSE_C */
 
     /*
      * 1.1. Load the keys
      */
-    if( !opt.selfsign && !strlen( opt.request_file ) )
-    {
-        mbedtls_printf( "  . Loading the subject key ..." );
-        fflush( stdout );
+    if (!opt.selfsign && !strlen(opt.request_file)) {
+        mbedtls_printf("  . Loading the subject key ...");
+        fflush(stdout);
 
-        ret = mbedtls_pk_parse_keyfile( &loaded_subject_key, opt.subject_key,
-                opt.subject_pwd, mbedtls_ctr_drbg_random, &ctr_drbg );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_pk_parse_keyfile(&loaded_subject_key, opt.subject_key,
+                                       opt.subject_pwd, mbedtls_ctr_drbg_random,
+                                       &ctr_drbg);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
-    mbedtls_printf( "  . Loading the issuer key ..." );
-    fflush( stdout );
+    mbedtls_printf("  . Loading the issuer key ...");
+    fflush(stdout);
 
-    ret = mbedtls_pk_parse_keyfile( &loaded_issuer_key, opt.issuer_key,
-            opt.issuer_pwd, mbedtls_ctr_drbg_random, &ctr_drbg );
-    if( ret != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_pk_parse_keyfile "
-                        "returned -x%02x - %s\n\n", (unsigned int) -ret, buf );
+    ret = mbedtls_pk_parse_keyfile(&loaded_issuer_key, opt.issuer_key,
+                                   opt.issuer_pwd, mbedtls_ctr_drbg_random,
+                                   &ctr_drbg);
+    if (ret != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_pk_parse_keyfile "
+                       "returned -x%02x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
     // Check if key and issuer certificate match
     //
-    if( strlen( opt.issuer_crt ) )
-    {
-        if( mbedtls_pk_check_pair( &issuer_crt.MBEDTLS_PRIVATE(pk), issuer_key,
-                                   mbedtls_ctr_drbg_random, &ctr_drbg ) != 0 )
-        {
-            mbedtls_printf( " failed\n  !  issuer_key does not match "
-                            "issuer certificate\n\n" );
+    if (strlen(opt.issuer_crt)) {
+        if (mbedtls_pk_check_pair(&issuer_crt.MBEDTLS_PRIVATE(pk), issuer_key,
+                                  mbedtls_ctr_drbg_random, &ctr_drbg) != 0) {
+            mbedtls_printf(" failed\n  !  issuer_key does not match "
+                           "issuer certificate\n\n");
             goto exit;
         }
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
-    if( opt.selfsign )
-    {
+    if (opt.selfsign) {
         opt.subject_name = opt.issuer_name;
         subject_key = issuer_key;
     }
 
-    mbedtls_x509write_crt_set_subject_key( &crt, subject_key );
-    mbedtls_x509write_crt_set_issuer_key( &crt, issuer_key );
+    mbedtls_x509write_crt_set_subject_key(&crt, subject_key);
+    mbedtls_x509write_crt_set_issuer_key(&crt, issuer_key);
 
     /*
      * 1.0. Check the names for validity
      */
-    if( ( ret = mbedtls_x509write_crt_set_subject_name( &crt, opt.subject_name ) ) != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_subject_name "
-                        "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+    if ((ret = mbedtls_x509write_crt_set_subject_name(&crt,
+                                                      opt.subject_name)) != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_subject_name "
+                       "returned -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    if( ( ret = mbedtls_x509write_crt_set_issuer_name( &crt, opt.issuer_name ) ) != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_issuer_name "
-                        "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+    if ((ret = mbedtls_x509write_crt_set_issuer_name(&crt, opt.issuer_name)) !=
+        0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_issuer_name "
+                       "returned -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    mbedtls_printf( "  . Setting certificate values ..." );
-    fflush( stdout );
+    mbedtls_printf("  . Setting certificate values ...");
+    fflush(stdout);
 
-    mbedtls_x509write_crt_set_version( &crt, opt.version );
-    mbedtls_x509write_crt_set_md_alg( &crt, opt.md );
+    mbedtls_x509write_crt_set_version(&crt, opt.version);
+    mbedtls_x509write_crt_set_md_alg(&crt, opt.md);
 
-    ret = mbedtls_x509write_crt_set_serial( &crt, &serial );
-    if( ret != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_serial "
-                        "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+    ret = mbedtls_x509write_crt_set_serial(&crt, &serial);
+    if (ret != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_serial "
+                       "returned -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    ret = mbedtls_x509write_crt_set_validity( &crt, opt.not_before, opt.not_after );
-    if( ret != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_validity "
-                        "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+    ret =
+        mbedtls_x509write_crt_set_validity(&crt, opt.not_before, opt.not_after);
+    if (ret != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_validity "
+                       "returned -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
-    if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
-        opt.basic_constraints != 0 )
-    {
-        mbedtls_printf( "  . Adding the Basic Constraints extension ..." );
-        fflush( stdout );
+    if (opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
+        opt.basic_constraints != 0) {
+        mbedtls_printf("  . Adding the Basic Constraints extension ...");
+        fflush(stdout);
 
-        ret = mbedtls_x509write_crt_set_basic_constraints( &crt, opt.is_ca,
-                                                           opt.max_pathlen );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  x509write_crt_set_basic_contraints "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_x509write_crt_set_basic_constraints(&crt, opt.is_ca,
+                                                          opt.max_pathlen);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  x509write_crt_set_basic_contraints "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
-#if defined(MBEDTLS_SHA1_C)
-    if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
-        opt.subject_identifier != 0 )
-    {
-        mbedtls_printf( "  . Adding the Subject Key Identifier ..." );
-        fflush( stdout );
+#    if defined(MBEDTLS_SHA1_C)
+    if (opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
+        opt.subject_identifier != 0) {
+        mbedtls_printf("  . Adding the Subject Key Identifier ...");
+        fflush(stdout);
 
-        ret = mbedtls_x509write_crt_set_subject_key_identifier( &crt );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_subject"
-                            "_key_identifier returned -0x%04x - %s\n\n",
-                            (unsigned int) -ret, buf );
+        ret = mbedtls_x509write_crt_set_subject_key_identifier(&crt);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_subject"
+                           "_key_identifier returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
-    if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
-        opt.authority_identifier != 0 )
-    {
-        mbedtls_printf( "  . Adding the Authority Key Identifier ..." );
-        fflush( stdout );
+    if (opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
+        opt.authority_identifier != 0) {
+        mbedtls_printf("  . Adding the Authority Key Identifier ...");
+        fflush(stdout);
 
-        ret = mbedtls_x509write_crt_set_authority_key_identifier( &crt );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_authority_"
-                            "key_identifier returned -0x%04x - %s\n\n",
-                            (unsigned int) -ret, buf );
+        ret = mbedtls_x509write_crt_set_authority_key_identifier(&crt);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_authority_"
+                           "key_identifier returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
-#endif /* MBEDTLS_SHA1_C */
+#    endif /* MBEDTLS_SHA1_C */
 
-    if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
-        opt.key_usage != 0 )
-    {
-        mbedtls_printf( "  . Adding the Key Usage extension ..." );
-        fflush( stdout );
+    if (opt.version == MBEDTLS_X509_CRT_VERSION_3 && opt.key_usage != 0) {
+        mbedtls_printf("  . Adding the Key Usage extension ...");
+        fflush(stdout);
 
-        ret = mbedtls_x509write_crt_set_key_usage( &crt, opt.key_usage );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_key_usage "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_x509write_crt_set_key_usage(&crt, opt.key_usage);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(" failed\n  !  mbedtls_x509write_crt_set_key_usage "
+                           "returned -0x%04x - %s\n\n",
+                           (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
-    if( opt.version == MBEDTLS_X509_CRT_VERSION_3 &&
-        opt.ns_cert_type != 0 )
-    {
-        mbedtls_printf( "  . Adding the NS Cert Type extension ..." );
-        fflush( stdout );
+    if (opt.version == MBEDTLS_X509_CRT_VERSION_3 && opt.ns_cert_type != 0) {
+        mbedtls_printf("  . Adding the NS Cert Type extension ...");
+        fflush(stdout);
 
-        ret = mbedtls_x509write_crt_set_ns_cert_type( &crt, opt.ns_cert_type );
-        if( ret != 0 )
-        {
-            mbedtls_strerror( ret, buf, 1024 );
-            mbedtls_printf( " failed\n  !  mbedtls_x509write_crt_set_ns_cert_type "
-                            "returned -0x%04x - %s\n\n", (unsigned int) -ret, buf );
+        ret = mbedtls_x509write_crt_set_ns_cert_type(&crt, opt.ns_cert_type);
+        if (ret != 0) {
+            mbedtls_strerror(ret, buf, 1024);
+            mbedtls_printf(
+                " failed\n  !  mbedtls_x509write_crt_set_ns_cert_type "
+                "returned -0x%04x - %s\n\n",
+                (unsigned int)-ret, buf);
             goto exit;
         }
 
-        mbedtls_printf( " ok\n" );
+        mbedtls_printf(" ok\n");
     }
 
     /*
      * 1.2. Writing the certificate
      */
-    mbedtls_printf( "  . Writing the certificate..." );
-    fflush( stdout );
+    mbedtls_printf("  . Writing the certificate...");
+    fflush(stdout);
 
-    if( ( ret = write_certificate( &crt, opt.output_file,
-                                   mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
-    {
-        mbedtls_strerror( ret, buf, 1024 );
-        mbedtls_printf( " failed\n  !  write_certificate -0x%04x - %s\n\n",
-                        (unsigned int) -ret, buf );
+    if ((ret = write_certificate(&crt, opt.output_file, mbedtls_ctr_drbg_random,
+                                 &ctr_drbg)) != 0) {
+        mbedtls_strerror(ret, buf, 1024);
+        mbedtls_printf(" failed\n  !  write_certificate -0x%04x - %s\n\n",
+                       (unsigned int)-ret, buf);
         goto exit;
     }
 
-    mbedtls_printf( " ok\n" );
+    mbedtls_printf(" ok\n");
 
     exit_code = MBEDTLS_EXIT_SUCCESS;
 
 exit:
-#if defined(MBEDTLS_X509_CSR_PARSE_C)
-    mbedtls_x509_csr_free( &csr );
-#endif /* MBEDTLS_X509_CSR_PARSE_C */
-    mbedtls_x509_crt_free( &issuer_crt );
-    mbedtls_x509write_crt_free( &crt );
-    mbedtls_pk_free( &loaded_subject_key );
-    mbedtls_pk_free( &loaded_issuer_key );
-    mbedtls_mpi_free( &serial );
-    mbedtls_ctr_drbg_free( &ctr_drbg );
-    mbedtls_entropy_free( &entropy );
+#    if defined(MBEDTLS_X509_CSR_PARSE_C)
+    mbedtls_x509_csr_free(&csr);
+#    endif /* MBEDTLS_X509_CSR_PARSE_C */
+    mbedtls_x509_crt_free(&issuer_crt);
+    mbedtls_x509write_crt_free(&crt);
+    mbedtls_pk_free(&loaded_subject_key);
+    mbedtls_pk_free(&loaded_issuer_key);
+    mbedtls_mpi_free(&serial);
+    mbedtls_ctr_drbg_free(&ctr_drbg);
+    mbedtls_entropy_free(&entropy);
 
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
+#    if defined(_WIN32)
+    mbedtls_printf("  + Press Enter to exit this program.\n");
+    fflush(stdout);
+    getchar();
+#    endif
 
-    mbedtls_exit( exit_code );
+    mbedtls_exit(exit_code);
 }
-#endif /* MBEDTLS_X509_CRT_WRITE_C && MBEDTLS_X509_CRT_PARSE_C &&
-          MBEDTLS_FS_IO && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
+#endif /* MBEDTLS_X509_CRT_WRITE_C && MBEDTLS_X509_CRT_PARSE_C &&     \
+          MBEDTLS_FS_IO && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && \
           MBEDTLS_ERROR_C && MBEDTLS_PEM_WRITE_C */