tests/suites/test_suite_x509parse.function

/* BEGIN_HEADER */
#include "mbedtls/x509.h"
#include "mbedtls/x509_crt.h"
#include "mbedtls/x509_crl.h"
#include "mbedtls/x509_csr.h"
#include "mbedtls/pem.h"
#include "mbedtls/oid.h"
#include "mbedtls/base64.h"

#if MBEDTLS_X509_MAX_INTERMEDIATE_CA > 19
#error "The value of MBEDTLS_X509_MAX_INTERMEDIATE_C is larger \
than the current threshold 19. To test larger values, please \
adapt the script tests/data_files/dir-max/long.sh."
#endif

/* Profile for backward compatibility. Allows SHA-1, unlike the default
   profile. */
const mbedtls_x509_crt_profile compat_profile =
{
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) |
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_RIPEMD160 ) |
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) |
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
    MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
    0xFFFFFFF, /* Any PK alg    */
    0xFFFFFFF, /* Any curve     */
    1024,
};

int verify_none( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32_t *flags )
{
    ((void) data);
    ((void) crt);
    ((void) certificate_depth);
    *flags |= MBEDTLS_X509_BADCERT_OTHER;

    return 0;
}

int verify_all( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32_t *flags )
{
    ((void) data);
    ((void) crt);
    ((void) certificate_depth);
    *flags = 0;

    return 0;
}

/* strsep() not available on Windows */
char *mystrsep(char **stringp, const char *delim)
{
    const char *p;
    char *ret = *stringp;

    if( *stringp == NULL )
        return( NULL );

    for( ; ; (*stringp)++ )
    {
        if( **stringp == '\0' )
        {
            *stringp = NULL;
            goto done;
        }

        for( p = delim; *p != '\0'; p++ )
            if( **stringp == *p )
            {
                **stringp = '\0';
                (*stringp)++;
                goto done;
            }
    }

done:
    return( ret );
}

#if defined(MBEDTLS_X509_CRT_PARSE_C)
typedef struct {
    char buf[512];
    char *p;
} verify_print_context;

void verify_print_init( verify_print_context *ctx )
{
    memset( ctx, 0, sizeof( verify_print_context ) );
    ctx->p = ctx->buf;
}

int verify_print( void *data, mbedtls_x509_crt *crt, int certificate_depth, uint32_t *flags )
{
    int ret;
    verify_print_context *ctx = (verify_print_context *) data;
    char *p = ctx->p;
    size_t n = ctx->buf + sizeof( ctx->buf ) - ctx->p;
    ((void) flags);

    ret = mbedtls_snprintf( p, n, "depth %d - serial ", certificate_depth );
    MBEDTLS_X509_SAFE_SNPRINTF;

    ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
    MBEDTLS_X509_SAFE_SNPRINTF;

    ret = mbedtls_snprintf( p, n, " - subject " );
    MBEDTLS_X509_SAFE_SNPRINTF;

    ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
    MBEDTLS_X509_SAFE_SNPRINTF;

    ret = mbedtls_snprintf( p, n, "\n" );
    MBEDTLS_X509_SAFE_SNPRINTF;

    ctx->p = p;

    return( 0 );
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_BIGNUM_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void x509_cert_info( char *crt_file, char *result_str )
{
    mbedtls_x509_crt   crt;
    char buf[2000];
    int res;

    mbedtls_x509_crt_init( &crt );
    memset( buf, 0, 2000 );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
    res = mbedtls_x509_crt_info( buf, 2000, "", &crt );

    TEST_ASSERT( res != -1 );
    TEST_ASSERT( res != -2 );

    TEST_ASSERT( strcmp( buf, result_str ) == 0 );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRL_PARSE_C */
void mbedtls_x509_crl_info( char *crl_file, char *result_str )
{
    mbedtls_x509_crl   crl;
    char buf[2000];
    int res;

    mbedtls_x509_crl_init( &crl );
    memset( buf, 0, 2000 );

    TEST_ASSERT( mbedtls_x509_crl_parse_file( &crl, crl_file ) == 0 );
    res = mbedtls_x509_crl_info( buf, 2000, "", &crl );

    TEST_ASSERT( res != -1 );
    TEST_ASSERT( res != -2 );

    TEST_ASSERT( strcmp( buf, result_str ) == 0 );

exit:
    mbedtls_x509_crl_free( &crl );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRL_PARSE_C */
void mbedtls_x509_crl_parse( char *crl_file, int result )
{
    mbedtls_x509_crl   crl;
    char buf[2000];

    mbedtls_x509_crl_init( &crl );
    memset( buf, 0, 2000 );

    TEST_ASSERT( mbedtls_x509_crl_parse_file( &crl, crl_file ) == result );

exit:
    mbedtls_x509_crl_free( &crl );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CSR_PARSE_C */
void mbedtls_x509_csr_info( char *csr_file, char *result_str )
{
    mbedtls_x509_csr   csr;
    char buf[2000];
    int res;

    mbedtls_x509_csr_init( &csr );
    memset( buf, 0, 2000 );

    TEST_ASSERT( mbedtls_x509_csr_parse_file( &csr, csr_file ) == 0 );
    res = mbedtls_x509_csr_info( buf, 2000, "", &csr );

    TEST_ASSERT( res != -1 );
    TEST_ASSERT( res != -2 );

    TEST_ASSERT( strcmp( buf, result_str ) == 0 );

exit:
    mbedtls_x509_csr_free( &csr );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
void x509_verify_info( int flags, char *prefix, char *result_str )
{
    char buf[2000];
    int res;

    memset( buf, 0, sizeof( buf ) );

    res = mbedtls_x509_crt_verify_info( buf, sizeof( buf ), prefix, flags );

    TEST_ASSERT( res >= 0 );

    TEST_ASSERT( strcmp( buf, result_str ) == 0 );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_CRL_PARSE_C */
void x509_verify( char *crt_file, char *ca_file, char *crl_file,
                  char *cn_name_str, int result, int flags_result,
                  char *profile_str,
                  char *verify_callback )
{
    mbedtls_x509_crt   crt;
    mbedtls_x509_crt   ca;
    mbedtls_x509_crl    crl;
    uint32_t         flags = 0;
    int         res;
    int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *) = NULL;
    char *      cn_name = NULL;
    const mbedtls_x509_crt_profile *profile;

    mbedtls_x509_crt_init( &crt );
    mbedtls_x509_crt_init( &ca );
    mbedtls_x509_crl_init( &crl );

    if( strcmp( cn_name_str, "NULL" ) != 0 )
        cn_name = cn_name_str;

    if( strcmp( profile_str, "default" ) == 0 )
        profile = &mbedtls_x509_crt_profile_default;
    else if( strcmp( profile_str, "next" ) == 0 )
        profile = &mbedtls_x509_crt_profile_next;
    else if( strcmp( profile_str, "suite_b" ) == 0 )
        profile = &mbedtls_x509_crt_profile_suiteb;
    else if( strcmp( profile_str, "compat" ) == 0 )
        profile = &compat_profile;
    else
        TEST_ASSERT( "Unknown algorithm profile" == 0 );

    if( strcmp( verify_callback, "NULL" ) == 0 )
        f_vrfy = NULL;
    else if( strcmp( verify_callback, "verify_none" ) == 0 )
        f_vrfy = verify_none;
    else if( strcmp( verify_callback, "verify_all" ) == 0 )
        f_vrfy = verify_all;
    else
        TEST_ASSERT( "No known verify callback selected" == 0 );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
    TEST_ASSERT( mbedtls_x509_crt_parse_file( &ca, ca_file ) == 0 );
    TEST_ASSERT( mbedtls_x509_crl_parse_file( &crl, crl_file ) == 0 );

    res = mbedtls_x509_crt_verify_with_profile( &crt, &ca, &crl, profile, cn_name, &flags, f_vrfy, NULL );

    TEST_ASSERT( res == ( result ) );
    TEST_ASSERT( flags == (uint32_t)( flags_result ) );

exit:
    mbedtls_x509_crt_free( &crt );
    mbedtls_x509_crt_free( &ca );
    mbedtls_x509_crl_free( &crl );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void x509_verify_callback( char *crt_file, char *ca_file,
                           int exp_ret, char *exp_vrfy_out )
{
    int ret;
    mbedtls_x509_crt crt;
    mbedtls_x509_crt ca;
    uint32_t flags = 0;
    verify_print_context vrfy_ctx;

    mbedtls_x509_crt_init( &crt );
    mbedtls_x509_crt_init( &ca );
    verify_print_init( &vrfy_ctx );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
    TEST_ASSERT( mbedtls_x509_crt_parse_file( &ca, ca_file ) == 0 );

    ret = mbedtls_x509_crt_verify_with_profile( &crt, &ca, NULL,
                                                &compat_profile,
                                                NULL, &flags,
                                                verify_print, &vrfy_ctx );

    TEST_ASSERT( ret == exp_ret );
    TEST_ASSERT( strcmp( vrfy_ctx.buf, exp_vrfy_out ) == 0 );

exit:
    mbedtls_x509_crt_free( &crt );
    mbedtls_x509_crt_free( &ca );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_dn_gets( char *crt_file, char *entity, char *result_str )
{
    mbedtls_x509_crt   crt;
    char buf[2000];
    int res = 0;

    mbedtls_x509_crt_init( &crt );
    memset( buf, 0, 2000 );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );
    if( strcmp( entity, "subject" ) == 0 )
        res =  mbedtls_x509_dn_gets( buf, 2000, &crt.subject );
    else if( strcmp( entity, "issuer" ) == 0 )
        res =  mbedtls_x509_dn_gets( buf, 2000, &crt.issuer );
    else
        TEST_ASSERT( "Unknown entity" == 0 );

    TEST_ASSERT( res != -1 );
    TEST_ASSERT( res != -2 );

    TEST_ASSERT( strcmp( buf, result_str ) == 0 );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_time_is_past( char *crt_file, char *entity, int result )
{
    mbedtls_x509_crt   crt;

    mbedtls_x509_crt_init( &crt );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );

    if( strcmp( entity, "valid_from" ) == 0 )
        TEST_ASSERT( mbedtls_x509_time_is_past( &crt.valid_from ) == result );
    else if( strcmp( entity, "valid_to" ) == 0 )
        TEST_ASSERT( mbedtls_x509_time_is_past( &crt.valid_to ) == result );
    else
        TEST_ASSERT( "Unknown entity" == 0 );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_time_is_future( char *crt_file, char *entity, int result )
{
    mbedtls_x509_crt   crt;

    mbedtls_x509_crt_init( &crt );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );

    if( strcmp( entity, "valid_from" ) == 0 )
        TEST_ASSERT( mbedtls_x509_time_is_future( &crt.valid_from ) == result );
    else if( strcmp( entity, "valid_to" ) == 0 )
        TEST_ASSERT( mbedtls_x509_time_is_future( &crt.valid_to ) == result );
    else
        TEST_ASSERT( "Unknown entity" == 0 );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_FS_IO */
void x509parse_crt_file( char *crt_file, int result )
{
    mbedtls_x509_crt crt;

    mbedtls_x509_crt_init( &crt );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == result );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
void x509parse_crt( char *crt_data, char *result_str, int result )
{
    mbedtls_x509_crt   crt;
    unsigned char buf[2000];
    unsigned char output[2000];
    int data_len, res;

    mbedtls_x509_crt_init( &crt );
    memset( buf, 0, 2000 );
    memset( output, 0, 2000 );

    data_len = unhexify( buf, crt_data );

    TEST_ASSERT( mbedtls_x509_crt_parse( &crt, buf, data_len ) == ( result ) );
    if( ( result ) == 0 )
    {
        res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );

        TEST_ASSERT( res != -1 );
        TEST_ASSERT( res != -2 );

        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
    }

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRL_PARSE_C */
void x509parse_crl( char *crl_data, char *result_str, int result )
{
    mbedtls_x509_crl   crl;
    unsigned char buf[2000];
    unsigned char output[2000];
    int data_len, res;

    mbedtls_x509_crl_init( &crl );
    memset( buf, 0, 2000 );
    memset( output, 0, 2000 );

    data_len = unhexify( buf, crl_data );

    TEST_ASSERT( mbedtls_x509_crl_parse( &crl, buf, data_len ) == ( result ) );
    if( ( result ) == 0 )
    {
        res = mbedtls_x509_crl_info( (char *) output, 2000, "", &crl );

        TEST_ASSERT( res != -1 );
        TEST_ASSERT( res != -2 );

        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
    }

exit:
    mbedtls_x509_crl_free( &crl );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CSR_PARSE_C */
void mbedtls_x509_csr_parse( char *csr_der_hex, char *ref_out, int ref_ret )
{
    mbedtls_x509_csr csr;
    unsigned char *csr_der = NULL;
    char my_out[1000];
    size_t csr_der_len;
    int my_ret;

    mbedtls_x509_csr_init( &csr );
    memset( my_out, 0, sizeof( my_out ) );
    csr_der = unhexify_alloc( csr_der_hex, &csr_der_len );

    my_ret = mbedtls_x509_csr_parse_der( &csr, csr_der, csr_der_len );
    TEST_ASSERT( my_ret == ref_ret );

    if( ref_ret == 0 )
    {
        size_t my_out_len = mbedtls_x509_csr_info( my_out, sizeof( my_out ), "", &csr );
        TEST_ASSERT( my_out_len == strlen( ref_out ) );
        TEST_ASSERT( strcmp( my_out, ref_out ) == 0 );
    }

exit:
    mbedtls_x509_csr_free( &csr );
    mbedtls_free( csr_der );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_crt_parse_path( char *crt_path, int ret, int nb_crt )
{
    mbedtls_x509_crt chain, *cur;
    int i;

    mbedtls_x509_crt_init( &chain );

    TEST_ASSERT( mbedtls_x509_crt_parse_path( &chain, crt_path ) == ret );

    /* Check how many certs we got */
    for( i = 0, cur = &chain; cur != NULL; cur = cur->next )
        if( cur->raw.p != NULL )
            i++;

    TEST_ASSERT( i == nb_crt );

exit:
    mbedtls_x509_crt_free( &chain );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_crt_verify_max( char *ca_file, char *chain_dir, int nb_int,
                                  int ret_chk, int flags_chk )
{
    char file_buf[128];
    int ret;
    uint32_t flags;
    mbedtls_x509_crt trusted, chain;

    /*
     * We expect chain_dir to contain certificates 00.crt, 01.crt, etc.
     * with NN.crt signed by NN-1.crt
     */

    mbedtls_x509_crt_init( &trusted );
    mbedtls_x509_crt_init( &chain );

    /* Load trusted root */
    TEST_ASSERT( mbedtls_x509_crt_parse_file( &trusted, ca_file ) == 0 );

    /* Load a chain with nb_int intermediates (from 01 to nb_int),
     * plus one "end-entity" cert (nb_int + 1) */
    ret = mbedtls_snprintf( file_buf, sizeof file_buf, "%s/c%02d.pem", chain_dir,
                                                            nb_int + 1 );
    TEST_ASSERT( ret > 0 && (size_t) ret < sizeof file_buf );
    TEST_ASSERT( mbedtls_x509_crt_parse_file( &chain, file_buf ) == 0 );

    /* Try to verify that chain */
    ret = mbedtls_x509_crt_verify( &chain, &trusted, NULL, NULL, &flags,
                                   NULL, NULL );
    TEST_ASSERT( ret == ret_chk );
    TEST_ASSERT( flags == (uint32_t) flags_chk );

exit:
    mbedtls_x509_crt_free( &chain );
    mbedtls_x509_crt_free( &trusted );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_x509_crt_verify_chain(  char *chain_paths, char *trusted_ca, int flags_result )
{
    char* act;
    uint32_t flags;
    int result, res;
    mbedtls_x509_crt trusted, chain;

    result= flags_result?MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:0;

    mbedtls_x509_crt_init( &chain );
    mbedtls_x509_crt_init( &trusted );

    while( ( act = mystrsep( &chain_paths, " " ) ) != NULL )
        TEST_ASSERT( mbedtls_x509_crt_parse_file( &chain, act ) == 0 );
    TEST_ASSERT( mbedtls_x509_crt_parse_file( &trusted, trusted_ca ) == 0 );

    res = mbedtls_x509_crt_verify( &chain, &trusted, NULL, NULL, &flags, NULL, NULL );

    TEST_ASSERT( res == ( result ) );
    TEST_ASSERT( flags == (uint32_t)( flags_result ) );

exit:
    mbedtls_x509_crt_free( &trusted );
    mbedtls_x509_crt_free( &chain );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
void x509_oid_desc( char *oid_str, char *ref_desc )
{
    mbedtls_x509_buf oid;
    const char *desc = NULL;
    unsigned char buf[20];
    int ret;

    memset( buf, 0, sizeof buf );

    oid.tag = MBEDTLS_ASN1_OID;
    oid.len = unhexify( buf, oid_str );
    oid.p   = buf;

    ret = mbedtls_oid_get_extended_key_usage( &oid, &desc );

    if( strcmp( ref_desc, "notfound" ) == 0 )
    {
        TEST_ASSERT( ret != 0 );
        TEST_ASSERT( desc == NULL );
    }
    else
    {
        TEST_ASSERT( ret == 0 );
        TEST_ASSERT( desc != NULL );
        TEST_ASSERT( strcmp( desc, ref_desc ) == 0 );
    }
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
void x509_oid_numstr( char *oid_str, char *numstr, int blen, int ret )
{
    mbedtls_x509_buf oid;
    unsigned char oid_buf[20];
    char num_buf[100];

    memset( oid_buf, 0x00, sizeof oid_buf );
    memset( num_buf, 0x2a, sizeof num_buf );

    oid.tag = MBEDTLS_ASN1_OID;
    oid.len = unhexify( oid_buf, oid_str );
    oid.p   = oid_buf;

    TEST_ASSERT( (size_t) blen <= sizeof num_buf );

    TEST_ASSERT( mbedtls_oid_get_numeric_string( num_buf, blen, &oid ) == ret );

    if( ret >= 0 )
    {
        TEST_ASSERT( num_buf[ret] == 0 );
        TEST_ASSERT( strcmp( num_buf, numstr ) == 0 );
    }
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_CHECK_KEY_USAGE */
void x509_check_key_usage( char *crt_file, int usage, int ret )
{
    mbedtls_x509_crt crt;

    mbedtls_x509_crt_init( &crt );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );

    TEST_ASSERT( mbedtls_x509_crt_check_key_usage( &crt, usage ) == ret );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
void x509_check_extended_key_usage( char *crt_file, char *usage_hex, int ret )
{
    mbedtls_x509_crt crt;
    char oid[50];
    size_t len;

    mbedtls_x509_crt_init( &crt );

    len = unhexify( (unsigned char *) oid, usage_hex );

    TEST_ASSERT( mbedtls_x509_crt_parse_file( &crt, crt_file ) == 0 );

    TEST_ASSERT( mbedtls_x509_crt_check_extended_key_usage( &crt, oid, len ) == ret );

exit:
    mbedtls_x509_crt_free( &crt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
void x509_get_time( int tag,  char *time_str, int ret,
                    int year, int mon, int day,
                    int hour, int min, int sec )
{
    mbedtls_x509_time time;
    unsigned char buf[21];
    unsigned char* start = buf;
    unsigned char* end = buf;

    memset( &time, 0x00, sizeof( time ) );
    *end = (unsigned char)tag; end++;
    *end = strlen( time_str );
    TEST_ASSERT( *end < 20 );
    end++;
    memcpy( end, time_str, (size_t)*(end - 1) );
    end += *(end - 1);

    TEST_ASSERT( mbedtls_x509_get_time( &start, end, &time ) == ret );
    if( ret == 0 )
    {
        TEST_ASSERT( year == time.year );
        TEST_ASSERT( mon  == time.mon  );
        TEST_ASSERT( day  == time.day  );
        TEST_ASSERT( hour == time.hour );
        TEST_ASSERT( min  == time.min  );
        TEST_ASSERT( sec  == time.sec  );
    }
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_RSASSA_PSS_SUPPORT */
void x509_parse_rsassa_pss_params( char *hex_params, int params_tag,
                                   int ref_msg_md, int ref_mgf_md,
                                   int ref_salt_len, int ref_ret )
{
    int my_ret;
    mbedtls_x509_buf params;
    mbedtls_md_type_t my_msg_md, my_mgf_md;
    int my_salt_len;

    params.p = unhexify_alloc( hex_params, &params.len );
    params.tag = params_tag;

    my_ret = mbedtls_x509_get_rsassa_pss_params( &params, &my_msg_md, &my_mgf_md,
                                         &my_salt_len );

    TEST_ASSERT( my_ret == ref_ret );

    if( ref_ret == 0 )
    {
        TEST_ASSERT( my_msg_md == (mbedtls_md_type_t) ref_msg_md );
        TEST_ASSERT( my_mgf_md == (mbedtls_md_type_t) ref_mgf_md );
        TEST_ASSERT( my_salt_len == ref_salt_len );
    }

exit:
    mbedtls_free( params.p );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_SELF_TEST */
void x509_selftest()
{
    TEST_ASSERT( mbedtls_x509_self_test( 1 ) == 0 );
}
/* END_CASE */