/* BEGIN_HEADER */
#include "mbedtls/bignum.h"
#include "mbedtls/x509_crt.h"
#include "mbedtls/x509_csr.h"
#include "mbedtls/pem.h"
#include "mbedtls/oid.h"
#include "mbedtls/rsa.h"

#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#include "mbedtls/psa_util.h"
#define PSA_INIT( ) PSA_ASSERT( psa_crypto_init( ) )
#endif /* MBEDTLS_USE_PSA_CRYPTO */

#if defined(MBEDTLS_RSA_C)
int mbedtls_rsa_decrypt_func( void *ctx, int mode, size_t *olen,
                       const unsigned char *input, unsigned char *output,
                       size_t output_max_len )
{
    return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, NULL, NULL, mode, olen,
                               input, output, output_max_len ) );
}
int mbedtls_rsa_sign_func( void *ctx,
                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
                   int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
                   const unsigned char *hash, unsigned char *sig )
{
    return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, mode,
                            md_alg, hashlen, hash, sig ) );
}
size_t mbedtls_rsa_key_len_func( void *ctx )
{
    return( ((const mbedtls_rsa_context *) ctx)->len );
}
#endif /* MBEDTLS_RSA_C */

#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
    defined(MBEDTLS_PEM_WRITE_C) && defined(MBEDTLS_X509_CSR_WRITE_C)
static int x509_crt_verifycsr( const unsigned char *buf, size_t buflen )
{
    unsigned char hash[MBEDTLS_MD_MAX_SIZE];
    const mbedtls_md_info_t *md_info;
    mbedtls_x509_csr csr;
    int ret = 0;

    mbedtls_x509_csr_init( &csr );

    if( mbedtls_x509_csr_parse( &csr, buf, buflen ) != 0 )
    {
        ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
        goto cleanup;
    }

    md_info = mbedtls_md_info_from_type( csr.sig_md );
    if( mbedtls_md( md_info, csr.cri.p, csr.cri.len, hash ) != 0 )
    {
        /* Note: this can't happen except after an internal error */
        ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
        goto cleanup;
    }

    if( mbedtls_pk_verify_ext( csr.sig_pk, csr.sig_opts, &csr.pk,
                       csr.sig_md, hash, mbedtls_md_get_size( md_info ),
                       csr.sig.p, csr.sig.len ) != 0 )
    {
        ret = MBEDTLS_ERR_X509_CERT_VERIFY_FAILED;
        goto cleanup;
    }

cleanup:

    mbedtls_x509_csr_free( &csr );
    return( ret );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_PEM_WRITE_C && MBEDTLS_X509_CSR_WRITE_C */

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_BIGNUM_C:MBEDTLS_FS_IO:MBEDTLS_PK_PARSE_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_PEM_WRITE_C:MBEDTLS_X509_CSR_WRITE_C */
void x509_csr_check( char * key_file, char * cert_req_check_file, int md_type,
                     int key_usage, int set_key_usage, int cert_type,
                     int set_cert_type )
{
    mbedtls_pk_context key;
    mbedtls_x509write_csr req;
    unsigned char buf[4096];
    unsigned char check_buf[4000];
    int ret;
    size_t olen = 0, pem_len = 0, buf_index;
    int der_len = -1;
    FILE *f;
    const char *subject_name = "C=NL,O=PolarSSL,CN=PolarSSL Server 1";
    mbedtls_test_rnd_pseudo_info rnd_info;

    memset( &rnd_info, 0x2a, sizeof( mbedtls_test_rnd_pseudo_info ) );

    mbedtls_pk_init( &key );
    TEST_ASSERT( mbedtls_pk_parse_keyfile( &key, key_file, NULL ) == 0 );

    mbedtls_x509write_csr_init( &req );
    mbedtls_x509write_csr_set_md_alg( &req, md_type );
    mbedtls_x509write_csr_set_key( &req, &key );
    TEST_ASSERT( mbedtls_x509write_csr_set_subject_name( &req, subject_name ) == 0 );
    if( set_key_usage != 0 )
        TEST_ASSERT( mbedtls_x509write_csr_set_key_usage( &req, key_usage ) == 0 );
    if( set_cert_type != 0 )
        TEST_ASSERT( mbedtls_x509write_csr_set_ns_cert_type( &req, cert_type ) == 0 );

    ret = mbedtls_x509write_csr_pem( &req, buf, sizeof( buf ),
                                     mbedtls_test_rnd_pseudo_rand, &rnd_info );
    TEST_ASSERT( ret == 0 );

    pem_len = strlen( (char *) buf );

    for( buf_index = pem_len; buf_index < sizeof( buf ); ++buf_index )
    {
        TEST_ASSERT( buf[buf_index] == 0 );
    }

    f = fopen( cert_req_check_file, "r" );
    TEST_ASSERT( f != NULL );
    olen = fread( check_buf, 1, sizeof( check_buf ), f );
    fclose( f );

    TEST_ASSERT( olen >= pem_len - 1 );
    TEST_ASSERT( memcmp( buf, check_buf, pem_len - 1 ) == 0 );

    der_len = mbedtls_x509write_csr_der( &req, buf, sizeof( buf ),
                                         mbedtls_test_rnd_pseudo_rand,
                                         &rnd_info );
    TEST_ASSERT( der_len >= 0 );

    if( der_len == 0 )
        goto exit;

    ret = mbedtls_x509write_csr_der( &req, buf, (size_t)( der_len - 1 ),
                                     mbedtls_test_rnd_pseudo_rand, &rnd_info );
    TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );

exit:
    mbedtls_x509write_csr_free( &req );
    mbedtls_pk_free( &key );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PEM_WRITE_C:MBEDTLS_X509_CSR_WRITE_C:MBEDTLS_USE_PSA_CRYPTO */
void x509_csr_check_opaque( char *key_file, int md_type, int key_usage,
                                 int cert_type )
{
    mbedtls_pk_context key;
    mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
    psa_algorithm_t md_alg_psa;
    mbedtls_x509write_csr req;
    unsigned char buf[4096];
    int ret;
    size_t pem_len = 0;
    const char *subject_name = "C=NL,O=PolarSSL,CN=PolarSSL Server 1";
    mbedtls_test_rnd_pseudo_info rnd_info;

    PSA_INIT( );
    memset( &rnd_info, 0x2a, sizeof( mbedtls_test_rnd_pseudo_info ) );

    md_alg_psa = mbedtls_psa_translate_md( (mbedtls_md_type_t) md_type );
    TEST_ASSERT( md_alg_psa != MBEDTLS_MD_NONE );

    mbedtls_pk_init( &key );
    TEST_ASSERT( mbedtls_pk_parse_keyfile( &key, key_file, NULL ) == 0 );
    TEST_ASSERT( mbedtls_pk_wrap_as_opaque( &key, &key_id, md_alg_psa ) == 0 );

    mbedtls_x509write_csr_init( &req );
    mbedtls_x509write_csr_set_md_alg( &req, md_type );
    mbedtls_x509write_csr_set_key( &req, &key );
    TEST_ASSERT( mbedtls_x509write_csr_set_subject_name( &req, subject_name ) == 0 );
    if( key_usage != 0 )
        TEST_ASSERT( mbedtls_x509write_csr_set_key_usage( &req, key_usage ) == 0 );
    if( cert_type != 0 )
        TEST_ASSERT( mbedtls_x509write_csr_set_ns_cert_type( &req, cert_type ) == 0 );

    ret = mbedtls_x509write_csr_pem( &req, buf, sizeof( buf ) - 1,
                                     mbedtls_test_rnd_pseudo_rand, &rnd_info );

    TEST_ASSERT( ret == 0 );

    pem_len = strlen( (char *) buf );
    buf[pem_len] = '\0';
    TEST_ASSERT( x509_crt_verifycsr( buf, pem_len + 1 ) == 0 );


exit:
    mbedtls_x509write_csr_free( &req );
    mbedtls_pk_free( &key );
    psa_destroy_key( key_id );
    PSA_DONE( );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PEM_WRITE_C:MBEDTLS_X509_CRT_WRITE_C:MBEDTLS_SHA1_C */
void x509_crt_check( char *subject_key_file, char *subject_pwd,
                     char *subject_name, char *issuer_key_file,
                     char *issuer_pwd, char *issuer_name,
                     char *serial_str, char *not_before, char *not_after,
                     int md_type, int key_usage, int set_key_usage,
                     int cert_type, int set_cert_type, int auth_ident,
                     int ver, char *cert_check_file, int rsa_alt )
{
    mbedtls_pk_context subject_key, issuer_key, issuer_key_alt;
    mbedtls_pk_context *key = &issuer_key;

    mbedtls_x509write_cert crt;
    unsigned char buf[4096];
    unsigned char check_buf[5000];
    mbedtls_mpi serial;
    int ret;
    size_t olen = 0, pem_len = 0, buf_index = 0;
    int der_len = -1;
    FILE *f;
    mbedtls_test_rnd_pseudo_info rnd_info;

    memset( &rnd_info, 0x2a, sizeof( mbedtls_test_rnd_pseudo_info ) );
    mbedtls_mpi_init( &serial );

    mbedtls_pk_init( &subject_key );
    mbedtls_pk_init( &issuer_key  );
    mbedtls_pk_init( &issuer_key_alt );

    mbedtls_x509write_crt_init( &crt );

    TEST_ASSERT( mbedtls_pk_parse_keyfile( &subject_key, subject_key_file,
                                         subject_pwd ) == 0 );

    TEST_ASSERT( mbedtls_pk_parse_keyfile( &issuer_key, issuer_key_file,
                                         issuer_pwd ) == 0 );

#if defined(MBEDTLS_RSA_C)
    /* For RSA PK contexts, create a copy as an alternative RSA context. */
    if( rsa_alt == 1 && mbedtls_pk_get_type( &issuer_key ) == MBEDTLS_PK_RSA )
    {
        TEST_ASSERT( mbedtls_pk_setup_rsa_alt( &issuer_key_alt,
                                            mbedtls_pk_rsa( issuer_key ),
                                            mbedtls_rsa_decrypt_func,
                                            mbedtls_rsa_sign_func,
                                            mbedtls_rsa_key_len_func ) == 0 );

        key = &issuer_key_alt;
    }
#else
    (void) rsa_alt;
#endif

    TEST_ASSERT( mbedtls_mpi_read_string( &serial, 10, serial_str ) == 0 );

    if( ver != -1 )
        mbedtls_x509write_crt_set_version( &crt, ver );

    TEST_ASSERT( mbedtls_x509write_crt_set_serial( &crt, &serial ) == 0 );
    TEST_ASSERT( mbedtls_x509write_crt_set_validity( &crt, not_before,
                                                     not_after ) == 0 );
    mbedtls_x509write_crt_set_md_alg( &crt, md_type );
    TEST_ASSERT( mbedtls_x509write_crt_set_issuer_name( &crt, issuer_name ) == 0 );
    TEST_ASSERT( mbedtls_x509write_crt_set_subject_name( &crt, subject_name ) == 0 );
    mbedtls_x509write_crt_set_subject_key( &crt, &subject_key );

    mbedtls_x509write_crt_set_issuer_key( &crt, key );

    if( crt.version >= MBEDTLS_X509_CRT_VERSION_3 )
    {
        TEST_ASSERT( mbedtls_x509write_crt_set_basic_constraints( &crt, 0, 0 ) == 0 );
        TEST_ASSERT( mbedtls_x509write_crt_set_subject_key_identifier( &crt ) == 0 );
        if( auth_ident )
            TEST_ASSERT( mbedtls_x509write_crt_set_authority_key_identifier( &crt ) == 0 );
        if( set_key_usage != 0 )
            TEST_ASSERT( mbedtls_x509write_crt_set_key_usage( &crt, key_usage ) == 0 );
        if( set_cert_type != 0 )
            TEST_ASSERT( mbedtls_x509write_crt_set_ns_cert_type( &crt, cert_type ) == 0 );
    }

    ret = mbedtls_x509write_crt_pem( &crt, buf, sizeof( buf ),
                                     mbedtls_test_rnd_pseudo_rand, &rnd_info );
    TEST_ASSERT( ret == 0 );

    pem_len = strlen( (char *) buf );

    // check that the rest of the buffer remains clear
    for( buf_index = pem_len; buf_index < sizeof( buf ); ++buf_index )
    {
        TEST_ASSERT( buf[buf_index] == 0 );
    }

    f = fopen( cert_check_file, "r" );
    TEST_ASSERT( f != NULL );
    olen = fread( check_buf, 1, sizeof( check_buf ), f );
    fclose( f );
    TEST_ASSERT( olen < sizeof( check_buf ) );

    TEST_ASSERT( olen >= pem_len - 1 );
    TEST_ASSERT( memcmp( buf, check_buf, pem_len - 1 ) == 0 );

    der_len = mbedtls_x509write_crt_der( &crt, buf, sizeof( buf ),
                                         mbedtls_test_rnd_pseudo_rand,
                                         &rnd_info );
    TEST_ASSERT( der_len >= 0 );

    if( der_len == 0 )
        goto exit;

    ret = mbedtls_x509write_crt_der( &crt, buf, (size_t)( der_len - 1 ),
                                     mbedtls_test_rnd_pseudo_rand, &rnd_info );
    TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );

exit:
    mbedtls_x509write_crt_free( &crt );
    mbedtls_pk_free( &issuer_key_alt );
    mbedtls_pk_free( &subject_key );
    mbedtls_pk_free( &issuer_key );
    mbedtls_mpi_free( &serial );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_X509_CREATE_C:MBEDTLS_X509_USE_C */
void mbedtls_x509_string_to_names( char * name, char * parsed_name, int result
                                   )
{
    int ret;
    size_t len = 0;
    mbedtls_asn1_named_data *names = NULL;
    mbedtls_x509_name parsed, *parsed_cur, *parsed_prv;
    unsigned char buf[1024], out[1024], *c;

    memset( &parsed, 0, sizeof( parsed ) );
    memset( out, 0, sizeof( out ) );
    memset( buf, 0, sizeof( buf ) );
    c = buf + sizeof( buf );

    ret = mbedtls_x509_string_to_names( &names, name );
    TEST_ASSERT( ret == result );

    if( ret != 0 )
        goto exit;

    ret = mbedtls_x509_write_names( &c, buf, names );
    TEST_ASSERT( ret > 0 );

    TEST_ASSERT( mbedtls_asn1_get_tag( &c, buf + sizeof( buf ), &len,
                        MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) == 0 );
    TEST_ASSERT( mbedtls_x509_get_name( &c, buf + sizeof( buf ), &parsed ) == 0 );

    ret = mbedtls_x509_dn_gets( (char *) out, sizeof( out ), &parsed );
    TEST_ASSERT( ret > 0 );

    TEST_ASSERT( strcmp( (char *) out, parsed_name ) == 0 );

exit:
    mbedtls_asn1_free_named_data_list( &names );

    parsed_cur = parsed.next;
    while( parsed_cur != 0 )
    {
        parsed_prv = parsed_cur;
        parsed_cur = parsed_cur->next;
        mbedtls_free( parsed_prv );
    }
}
/* END_CASE */