diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index 0c5e991..4a65939 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -40,258 +40,264 @@
 #include "mbedtls/pem.h"
 #endif /* MBEDTLS_PEM_WRITE_C */
 
-void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
+void mbedtls_x509write_crt_init(mbedtls_x509write_cert *ctx)
 {
-    memset( ctx, 0, sizeof( mbedtls_x509write_cert ) );
+    memset(ctx, 0, sizeof(mbedtls_x509write_cert));
 
-    mbedtls_mpi_init( &ctx->serial );
+    mbedtls_mpi_init(&ctx->serial);
     ctx->version = MBEDTLS_X509_CRT_VERSION_3;
 }
 
-void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx )
+void mbedtls_x509write_crt_free(mbedtls_x509write_cert *ctx)
 {
-    mbedtls_mpi_free( &ctx->serial );
+    mbedtls_mpi_free(&ctx->serial);
 
-    mbedtls_asn1_free_named_data_list( &ctx->subject );
-    mbedtls_asn1_free_named_data_list( &ctx->issuer );
-    mbedtls_asn1_free_named_data_list( &ctx->extensions );
+    mbedtls_asn1_free_named_data_list(&ctx->subject);
+    mbedtls_asn1_free_named_data_list(&ctx->issuer);
+    mbedtls_asn1_free_named_data_list(&ctx->extensions);
 
-    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_cert ) );
+    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_x509write_cert));
 }
 
-void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx,
-                                        int version )
+void mbedtls_x509write_crt_set_version(mbedtls_x509write_cert *ctx,
+                                       int version)
 {
     ctx->version = version;
 }
 
-void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx,
-                                       mbedtls_md_type_t md_alg )
+void mbedtls_x509write_crt_set_md_alg(mbedtls_x509write_cert *ctx,
+                                      mbedtls_md_type_t md_alg)
 {
     ctx->md_alg = md_alg;
 }
 
-void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx,
-                                            mbedtls_pk_context *key )
+void mbedtls_x509write_crt_set_subject_key(mbedtls_x509write_cert *ctx,
+                                           mbedtls_pk_context *key)
 {
     ctx->subject_key = key;
 }
 
-void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx,
-                                           mbedtls_pk_context *key )
+void mbedtls_x509write_crt_set_issuer_key(mbedtls_x509write_cert *ctx,
+                                          mbedtls_pk_context *key)
 {
     ctx->issuer_key = key;
 }
 
-int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
-                                            const char *subject_name )
+int mbedtls_x509write_crt_set_subject_name(mbedtls_x509write_cert *ctx,
+                                           const char *subject_name)
 {
-    return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
+    return mbedtls_x509_string_to_names(&ctx->subject, subject_name);
 }
 
-int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
-                                           const char *issuer_name )
+int mbedtls_x509write_crt_set_issuer_name(mbedtls_x509write_cert *ctx,
+                                          const char *issuer_name)
 {
-    return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name );
+    return mbedtls_x509_string_to_names(&ctx->issuer, issuer_name);
 }
 
-int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx,
-                                      const mbedtls_mpi *serial )
+int mbedtls_x509write_crt_set_serial(mbedtls_x509write_cert *ctx,
+                                     const mbedtls_mpi *serial)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
-    if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 )
-        return( ret );
+    if ((ret = mbedtls_mpi_copy(&ctx->serial, serial)) != 0) {
+        return ret;
+    }
 
-    return( 0 );
+    return 0;
 }
 
-int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx,
-                                        const char *not_before,
-                                        const char *not_after )
+int mbedtls_x509write_crt_set_validity(mbedtls_x509write_cert *ctx,
+                                       const char *not_before,
+                                       const char *not_after)
 {
-    if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
-        strlen( not_after )  != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 )
-    {
-        return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
+    if (strlen(not_before) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
+        strlen(not_after)  != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1) {
+        return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
     }
-    strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
-    strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
+    strncpy(ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN);
+    strncpy(ctx->not_after, not_after, MBEDTLS_X509_RFC5280_UTC_TIME_LEN);
     ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
     ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
 
-    return( 0 );
+    return 0;
 }
 
-int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
-                                 const char *oid, size_t oid_len,
-                                 int critical,
-                                 const unsigned char *val, size_t val_len )
+int mbedtls_x509write_crt_set_extension(mbedtls_x509write_cert *ctx,
+                                        const char *oid, size_t oid_len,
+                                        int critical,
+                                        const unsigned char *val, size_t val_len)
 {
-    return( mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
-                                        critical, val, val_len ) );
+    return mbedtls_x509_set_extension(&ctx->extensions, oid, oid_len,
+                                      critical, val, val_len);
 }
 
-int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
-                                                 int is_ca, int max_pathlen )
+int mbedtls_x509write_crt_set_basic_constraints(mbedtls_x509write_cert *ctx,
+                                                int is_ca, int max_pathlen)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char buf[9];
     unsigned char *c = buf + sizeof(buf);
     size_t len = 0;
 
-    memset( buf, 0, sizeof(buf) );
+    memset(buf, 0, sizeof(buf));
 
-    if( is_ca && max_pathlen > 127 )
-        return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
-
-    if( is_ca )
-    {
-        if( max_pathlen >= 0 )
-        {
-            MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf,
-                                                               max_pathlen ) );
-        }
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) );
+    if (is_ca && max_pathlen > 127) {
+        return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
     }
 
-    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 ) );
+    if (is_ca) {
+        if (max_pathlen >= 0) {
+            MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(&c, buf,
+                                                             max_pathlen));
+        }
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_bool(&c, buf, 1));
+    }
 
-    return(
-        mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
-                             MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ),
-                             is_ca, buf + sizeof(buf) - len, len ) );
+    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_BASIC_CONSTRAINTS,
+                                            MBEDTLS_OID_SIZE(MBEDTLS_OID_BASIC_CONSTRAINTS),
+                                            is_ca, buf + sizeof(buf) - len, len);
 }
 
 #if defined(MBEDTLS_SHA1_C)
-int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx )
+int mbedtls_x509write_crt_set_subject_key_identifier(mbedtls_x509write_cert *ctx)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
     unsigned char *c = buf + sizeof(buf);
     size_t len = 0;
 
-    memset( buf, 0, sizeof(buf) );
-    MBEDTLS_ASN1_CHK_ADD( len,
-                mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) );
+    memset(buf, 0, sizeof(buf));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_pk_write_pubkey(&c, buf, ctx->subject_key));
 
-    ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
-                            buf + sizeof( buf ) - 20 );
-    if( ret != 0 )
-        return( ret );
-    c = buf + sizeof( buf ) - 20;
+    ret = mbedtls_sha1_ret(buf + sizeof(buf) - len, len,
+                           buf + sizeof(buf) - 20);
+    if (ret != 0) {
+        return ret;
+    }
+    c = buf + sizeof(buf) - 20;
     len = 20;
 
-    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_OCTET_STRING ) );
+    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_OCTET_STRING));
 
-    return mbedtls_x509write_crt_set_extension( ctx,
-                 MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
-                 MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ),
-                 0, buf + sizeof(buf) - len, len );
+    return mbedtls_x509write_crt_set_extension(ctx,
+                                               MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
+                                               MBEDTLS_OID_SIZE(MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER),
+                                               0, buf + sizeof(buf) - len, len);
 }
 
-int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx )
+int mbedtls_x509write_crt_set_authority_key_identifier(mbedtls_x509write_cert *ctx)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
-    unsigned char *c = buf + sizeof( buf );
+    unsigned char *c = buf + sizeof(buf);
     size_t len = 0;
 
-    memset( buf, 0, sizeof(buf) );
-    MBEDTLS_ASN1_CHK_ADD( len,
-                          mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) );
+    memset(buf, 0, sizeof(buf));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_pk_write_pubkey(&c, buf, ctx->issuer_key));
 
-    ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
-                            buf + sizeof( buf ) - 20 );
-    if( ret != 0 )
-        return( ret );
-    c = buf + sizeof( buf ) - 20;
+    ret = mbedtls_sha1_ret(buf + sizeof(buf) - len, len,
+                           buf + sizeof(buf) - 20);
+    if (ret != 0) {
+        return ret;
+    }
+    c = buf + sizeof(buf) - 20;
     len = 20;
 
-    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_CONTEXT_SPECIFIC | 0 ) );
+    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_CONTEXT_SPECIFIC | 0));
 
-    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 ) );
+    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_AUTHORITY_KEY_IDENTIFIER,
-        MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ),
-        0, buf + sizeof( buf ) - len, len );
+        MBEDTLS_OID_SIZE(MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER),
+        0, buf + sizeof(buf) - len, len);
 }
 #endif /* MBEDTLS_SHA1_C */
 
-int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
-                                         unsigned int key_usage )
+int mbedtls_x509write_crt_set_key_usage(mbedtls_x509write_cert *ctx,
+                                        unsigned int key_usage)
 {
-    unsigned char buf[5] = {0}, ku[2] = {0};
+    unsigned char buf[5] = { 0 }, ku[2] = { 0 };
     unsigned char *c;
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
-        MBEDTLS_X509_KU_NON_REPUDIATION   |
-        MBEDTLS_X509_KU_KEY_ENCIPHERMENT  |
-        MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
-        MBEDTLS_X509_KU_KEY_AGREEMENT     |
-        MBEDTLS_X509_KU_KEY_CERT_SIGN     |
-        MBEDTLS_X509_KU_CRL_SIGN          |
-        MBEDTLS_X509_KU_ENCIPHER_ONLY     |
-        MBEDTLS_X509_KU_DECIPHER_ONLY;
+                                      MBEDTLS_X509_KU_NON_REPUDIATION   |
+                                      MBEDTLS_X509_KU_KEY_ENCIPHERMENT  |
+                                      MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
+                                      MBEDTLS_X509_KU_KEY_AGREEMENT     |
+                                      MBEDTLS_X509_KU_KEY_CERT_SIGN     |
+                                      MBEDTLS_X509_KU_CRL_SIGN          |
+                                      MBEDTLS_X509_KU_ENCIPHER_ONLY     |
+                                      MBEDTLS_X509_KU_DECIPHER_ONLY;
 
     /* Check that nothing other than the allowed flags is set */
-    if( ( key_usage & ~allowed_bits ) != 0 )
-        return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
+    if ((key_usage & ~allowed_bits) != 0) {
+        return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
+    }
 
     c = buf + 5;
-    MBEDTLS_PUT_UINT16_LE( key_usage, ku, 0 );
-    ret = mbedtls_asn1_write_named_bitstring( &c, buf, ku, 9 );
+    MBEDTLS_PUT_UINT16_LE(key_usage, ku, 0);
+    ret = mbedtls_asn1_write_named_bitstring(&c, buf, ku, 9);
 
-    if( ret < 0 )
-        return( ret );
-    else if( ret < 3 || ret > 5 )
-        return( MBEDTLS_ERR_X509_INVALID_FORMAT );
+    if (ret < 0) {
+        return ret;
+    } else if (ret < 3 || ret > 5) {
+        return MBEDTLS_ERR_X509_INVALID_FORMAT;
+    }
 
-    ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
-                                   MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
-                                   1, c, (size_t)ret );
-    if( ret != 0 )
-        return( ret );
+    ret = mbedtls_x509write_crt_set_extension(ctx, MBEDTLS_OID_KEY_USAGE,
+                                              MBEDTLS_OID_SIZE(MBEDTLS_OID_KEY_USAGE),
+                                              1, c, (size_t) ret);
+    if (ret != 0) {
+        return ret;
+    }
 
-    return( 0 );
+    return 0;
 }
 
-int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
-                                    unsigned char ns_cert_type )
+int mbedtls_x509write_crt_set_ns_cert_type(mbedtls_x509write_cert *ctx,
+                                           unsigned char ns_cert_type)
 {
-    unsigned char buf[4] = {0};
+    unsigned char buf[4] = { 0 };
     unsigned char *c;
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
     c = buf + 4;
 
-    ret = mbedtls_asn1_write_named_bitstring( &c, buf, &ns_cert_type, 8 );
-    if( ret < 3 || ret > 4 )
-        return( ret );
+    ret = mbedtls_asn1_write_named_bitstring(&c, buf, &ns_cert_type, 8);
+    if (ret < 3 || ret > 4) {
+        return ret;
+    }
 
-    ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
-                                   MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
-                                   0, c, (size_t)ret );
-    if( ret != 0 )
-        return( ret );
+    ret = mbedtls_x509write_crt_set_extension(ctx, MBEDTLS_OID_NS_CERT_TYPE,
+                                              MBEDTLS_OID_SIZE(MBEDTLS_OID_NS_CERT_TYPE),
+                                              0, c, (size_t) ret);
+    if (ret != 0) {
+        return ret;
+    }
 
-    return( 0 );
+    return 0;
 }
 
-static int x509_write_time( unsigned char **p, unsigned char *start,
-                            const char *t, size_t size )
+static int x509_write_time(unsigned char **p, unsigned char *start,
+                           const char *t, size_t size)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t len = 0;
@@ -299,32 +305,29 @@
     /*
      * write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
      */
-    if( t[0] < '2' || ( t[0] == '2' && t[1] == '0' && t[2] < '5' ) )
-    {
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
-                                             (const unsigned char *) t + 2,
-                                             size - 2 ) );
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
-                                             MBEDTLS_ASN1_UTC_TIME ) );
-    }
-    else
-    {
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
-                                                  (const unsigned char *) t,
-                                                  size ) );
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
-        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
-                                             MBEDTLS_ASN1_GENERALIZED_TIME ) );
+    if (t[0] < '2' || (t[0] == '2' && t[1] == '0' && t[2] < '5')) {
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start,
+                                                                (const unsigned char *) t + 2,
+                                                                size - 2));
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start,
+                                                         MBEDTLS_ASN1_UTC_TIME));
+    } else {
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start,
+                                                                (const unsigned char *) t,
+                                                                size));
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start,
+                                                         MBEDTLS_ASN1_GENERALIZED_TIME));
     }
 
-    return( (int) len );
+    return (int) len;
 }
 
-int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx,
-                               unsigned char *buf, size_t size,
-                               int (*f_rng)(void *, unsigned char *, size_t),
-                               void *p_rng )
+int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx,
+                              unsigned char *buf, size_t size,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     const char *sig_oid;
@@ -345,17 +348,17 @@
 
     /* There's no direct way of extracting a signature algorithm
      * (represented as an element of mbedtls_pk_type_t) from a PK instance. */
-    if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_RSA ) )
+    if (mbedtls_pk_can_do(ctx->issuer_key, MBEDTLS_PK_RSA)) {
         pk_alg = MBEDTLS_PK_RSA;
-    else if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_ECDSA ) )
+    } else if (mbedtls_pk_can_do(ctx->issuer_key, MBEDTLS_PK_ECDSA)) {
         pk_alg = MBEDTLS_PK_ECDSA;
-    else
-        return( MBEDTLS_ERR_X509_INVALID_ALG );
+    } else {
+        return MBEDTLS_ERR_X509_INVALID_ALG;
+    }
 
-    if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
-                                          &sig_oid, &sig_oid_len ) ) != 0 )
-    {
-        return( ret );
+    if ((ret = mbedtls_oid_get_oid_by_sig_alg(pk_alg, ctx->md_alg,
+                                              &sig_oid, &sig_oid_len)) != 0) {
+        return ret;
     }
 
     /*
@@ -363,38 +366,37 @@
      */
 
     /* Only for v3 */
-    if( ctx->version == MBEDTLS_X509_CRT_VERSION_3 )
-    {
-        MBEDTLS_ASN1_CHK_ADD( len,
-                              mbedtls_x509_write_extensions( &c,
-                                                      buf, ctx->extensions ) );
-        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 ) );
-        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_CONTEXT_SPECIFIC |
-                                               MBEDTLS_ASN1_CONSTRUCTED | 3 ) );
+    if (ctx->version == MBEDTLS_X509_CRT_VERSION_3) {
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_x509_write_extensions(&c,
+                                                           buf, ctx->extensions));
+        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));
+        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_CONTEXT_SPECIFIC |
+                                                    MBEDTLS_ASN1_CONSTRUCTED | 3));
     }
 
     /*
      *  SubjectPublicKeyInfo
      */
-    MBEDTLS_ASN1_CHK_ADD( pub_len,
-                          mbedtls_pk_write_pubkey_der( ctx->subject_key,
-                                                       buf, c - buf ) );
+    MBEDTLS_ASN1_CHK_ADD(pub_len,
+                         mbedtls_pk_write_pubkey_der(ctx->subject_key,
+                                                     buf, c - buf));
     c -= pub_len;
     len += pub_len;
 
     /*
      *  Subject  ::=  Name
      */
-    MBEDTLS_ASN1_CHK_ADD( len,
-                          mbedtls_x509_write_names( &c, buf,
-                                                    ctx->subject ) );
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_x509_write_names(&c, buf,
+                                                  ctx->subject));
 
     /*
      *  Validity ::= SEQUENCE {
@@ -403,93 +405,91 @@
      */
     sub_len = 0;
 
-    MBEDTLS_ASN1_CHK_ADD( sub_len,
-                          x509_write_time( &c, buf, ctx->not_after,
-                                        MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
+    MBEDTLS_ASN1_CHK_ADD(sub_len,
+                         x509_write_time(&c, buf, ctx->not_after,
+                                         MBEDTLS_X509_RFC5280_UTC_TIME_LEN));
 
-    MBEDTLS_ASN1_CHK_ADD( sub_len,
-                          x509_write_time( &c, buf, ctx->not_before,
-                                        MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
+    MBEDTLS_ASN1_CHK_ADD(sub_len,
+                         x509_write_time(&c, buf, ctx->not_before,
+                                         MBEDTLS_X509_RFC5280_UTC_TIME_LEN));
 
     len += sub_len;
-    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, sub_len ) );
-    MBEDTLS_ASN1_CHK_ADD( len,
-                          mbedtls_asn1_write_tag( &c, buf,
-                                                  MBEDTLS_ASN1_CONSTRUCTED |
-                                                  MBEDTLS_ASN1_SEQUENCE ) );
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, sub_len));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_tag(&c, buf,
+                                                MBEDTLS_ASN1_CONSTRUCTED |
+                                                MBEDTLS_ASN1_SEQUENCE));
 
     /*
      *  Issuer  ::=  Name
      */
-    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, buf,
-                                                         ctx->issuer ) );
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_x509_write_names(&c, buf,
+                                                       ctx->issuer));
 
     /*
      *  Signature   ::=  AlgorithmIdentifier
      */
-    MBEDTLS_ASN1_CHK_ADD( len,
-                          mbedtls_asn1_write_algorithm_identifier( &c, buf,
-                                              sig_oid, strlen( sig_oid ), 0 ) );
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_algorithm_identifier(&c, buf,
+                                                                 sig_oid, strlen(sig_oid), 0));
 
     /*
      *  Serial   ::=  INTEGER
      */
-    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, buf,
-                                                       &ctx->serial ) );
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&c, buf,
+                                                     &ctx->serial));
 
     /*
      *  Version  ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
      */
 
     /* Can be omitted for v1 */
-    if( ctx->version != MBEDTLS_X509_CRT_VERSION_1 )
-    {
+    if (ctx->version != MBEDTLS_X509_CRT_VERSION_1) {
         sub_len = 0;
-        MBEDTLS_ASN1_CHK_ADD( sub_len,
-                              mbedtls_asn1_write_int( &c, buf, ctx->version ) );
+        MBEDTLS_ASN1_CHK_ADD(sub_len,
+                             mbedtls_asn1_write_int(&c, buf, ctx->version));
         len += sub_len;
-        MBEDTLS_ASN1_CHK_ADD( len,
-                              mbedtls_asn1_write_len( &c, buf, sub_len ) );
-        MBEDTLS_ASN1_CHK_ADD( len,
-                              mbedtls_asn1_write_tag( &c, buf,
-                                               MBEDTLS_ASN1_CONTEXT_SPECIFIC |
-                                               MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_len(&c, buf, sub_len));
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_tag(&c, buf,
+                                                    MBEDTLS_ASN1_CONTEXT_SPECIFIC |
+                                                    MBEDTLS_ASN1_CONSTRUCTED | 0));
     }
 
-    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 ) );
+    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));
 
     /*
      * Make signature
      */
 
     /* Compute hash of CRT. */
-    if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c,
-                            len, hash ) ) != 0 )
-    {
-        return( ret );
+    if ((ret = mbedtls_md(mbedtls_md_info_from_type(ctx->md_alg), c,
+                          len, hash)) != 0) {
+        return ret;
     }
 
-    if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg,
-                                 hash, 0, sig, &sig_len,
-                                 f_rng, p_rng ) ) != 0 )
-    {
-        return( ret );
+    if ((ret = mbedtls_pk_sign(ctx->issuer_key, ctx->md_alg,
+                               hash, 0, sig, &sig_len,
+                               f_rng, p_rng)) != 0) {
+        return ret;
     }
 
     /* Move CRT to the front of the buffer to have space
      * for the signature. */
-    memmove( buf, c, len );
+    memmove(buf, c, len);
     c = buf + len;
 
     /* Add signature at the end of the buffer,
      * making sure that it doesn't underflow
      * into the CRT buffer. */
     c2 = buf + size;
-    MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, c,
-                                        sig_oid, sig_oid_len, sig, sig_len ) );
+    MBEDTLS_ASN1_CHK_ADD(sig_and_oid_len, mbedtls_x509_write_sig(&c2, c,
+                                                                 sig_oid, sig_oid_len, sig,
+                                                                 sig_len));
 
     /*
      * Memory layout after this step:
@@ -500,43 +500,41 @@
 
     /* Move raw CRT to just before the signature. */
     c = c2 - len;
-    memmove( c, buf, len );
+    memmove(c, buf, len);
 
     len += sig_and_oid_len;
-    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 ) );
+    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( (int) len );
+    return (int) len;
 }
 
 #define PEM_BEGIN_CRT           "-----BEGIN CERTIFICATE-----\n"
 #define PEM_END_CRT             "-----END CERTIFICATE-----\n"
 
 #if defined(MBEDTLS_PEM_WRITE_C)
-int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *crt,
-                               unsigned char *buf, size_t size,
-                               int (*f_rng)(void *, unsigned char *, size_t),
-                               void *p_rng )
+int mbedtls_x509write_crt_pem(mbedtls_x509write_cert *crt,
+                              unsigned char *buf, size_t size,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t olen;
 
-    if( ( ret = mbedtls_x509write_crt_der( crt, buf, size,
-                                   f_rng, p_rng ) ) < 0 )
-    {
-        return( ret );
+    if ((ret = mbedtls_x509write_crt_der(crt, buf, size,
+                                         f_rng, p_rng)) < 0) {
+        return ret;
     }
 
-    if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
-                                          buf + size - ret, ret,
-                                          buf, size, &olen ) ) != 0 )
-    {
-        return( ret );
+    if ((ret = mbedtls_pem_write_buffer(PEM_BEGIN_CRT, PEM_END_CRT,
+                                        buf + size - ret, ret,
+                                        buf, size, &olen)) != 0) {
+        return ret;
     }
 
-    return( 0 );
+    return 0;
 }
 #endif /* MBEDTLS_PEM_WRITE_C */