/* BEGIN_HEADER */
#include <polarssl/pk.h>

/* For error codes */
#include <polarssl/ecp.h>
#include <polarssl/rsa.h>

static int rnd_std_rand( void *rng_state, unsigned char *output, size_t len );

#define RSA_KEY_SIZE 512
#define RSA_KEY_LEN   64

static int pk_genkey( pk_context *pk )
{
    ((void) pk);

#if defined(POLARSSL_RSA_C) && defined(POLARSSL_GENPRIME)
    if( pk_get_type( pk ) == POLARSSL_PK_RSA )
        return rsa_gen_key( pk_rsa( *pk ), rnd_std_rand, NULL, RSA_KEY_SIZE, 3 );
#endif
#if defined(POLARSSL_ECP_C)
    if( pk_get_type( pk ) == POLARSSL_PK_ECKEY ||
        pk_get_type( pk ) == POLARSSL_PK_ECKEY_DH ||
        pk_get_type( pk ) == POLARSSL_PK_ECDSA )
    {
        int ret;
        if( ( ret = ecp_use_known_dp( &pk_ec( *pk )->grp,
                                      POLARSSL_ECP_DP_SECP192R1 ) ) != 0 )
            return( ret );

        return ecp_gen_keypair( &pk_ec( *pk )->grp, &pk_ec( *pk )->d,
                                &pk_ec( *pk )->Q, rnd_std_rand, NULL );
    }
#endif
    return( -1 );
}

#if defined(POLARSSL_RSA_C)
int rsa_decrypt_func( void *ctx, int mode, size_t *olen,
                       const unsigned char *input, unsigned char *output,
                       size_t output_max_len )
{
    return( rsa_pkcs1_decrypt( (rsa_context *) ctx, NULL, NULL, mode, olen,
                               input, output, output_max_len ) );
}
int rsa_sign_func( void *ctx,
                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
                   int mode, md_type_t md_alg, unsigned int hashlen,
                   const unsigned char *hash, unsigned char *sig )
{
    return( rsa_pkcs1_sign( (rsa_context *) ctx, f_rng, p_rng, mode,
                            md_alg, hashlen, hash, sig ) );
}
size_t rsa_key_len_func( void *ctx )
{
    return( ((const rsa_context *) ctx)->len );
}
#endif /* POLARSSL_RSA_C */
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:POLARSSL_PK_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void pk_utils( int type, int size, int len, char *name )
{
    pk_context pk;

    pk_init( &pk );

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( type ) ) == 0 );
    TEST_ASSERT( pk_genkey( &pk ) == 0 );

    TEST_ASSERT( (int) pk_get_type( &pk ) == type );
    TEST_ASSERT( pk_can_do( &pk, type ) );
    TEST_ASSERT( pk_get_size( &pk ) == (unsigned) size );
    TEST_ASSERT( pk_get_len( &pk ) == (unsigned) len );
    TEST_ASSERT( strcmp( pk_get_name( &pk), name ) == 0 );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_PK_PARSE_C:POLARSSL_FS_IO */
void pk_check_pair( char *pub_file, char *prv_file, int ret )
{
    pk_context pub, prv, alt;

    pk_init( &pub );
    pk_init( &prv );
    pk_init( &alt );

    TEST_ASSERT( pk_parse_public_keyfile( &pub, pub_file ) == 0 );
    TEST_ASSERT( pk_parse_keyfile( &prv, prv_file, NULL ) == 0 );

    TEST_ASSERT( pk_check_pair( &pub, &prv ) == ret );

#if defined(POLARSSL_RSA_C)
    if( pk_get_type( &prv ) == POLARSSL_PK_RSA )
    {
        TEST_ASSERT( pk_init_ctx_rsa_alt( &alt, pk_rsa( prv ),
                     rsa_decrypt_func, rsa_sign_func, rsa_key_len_func ) == 0 );
        TEST_ASSERT( pk_check_pair( &pub, &alt ) == ret );
    }
#endif

    pk_free( &pub );
    pk_free( &prv );
    pk_free( &alt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_RSA_C */
void pk_rsa_verify_test_vec( char *message_hex_string, int digest,
                       int mod, int radix_N, char *input_N, int radix_E,
                       char *input_E, char *result_hex_str, int result )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char result_str[1000];
    rsa_context *rsa;
    pk_context pk;
    int msg_len;

    pk_init( &pk );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( POLARSSL_PK_RSA ) ) == 0 );
    rsa = pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    msg_len = unhexify( message_str, message_hex_string );
    unhexify( result_str, result_hex_str );

    if( md_info_from_type( digest ) != NULL )
        TEST_ASSERT( md( md_info_from_type( digest ), message_str, msg_len, hash_result ) == 0 );

    TEST_ASSERT( pk_verify( &pk, digest, hash_result, 0,
                            result_str, pk_get_len( &pk ) ) == result );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_RSA_C */
void pk_rsa_verify_ext_test_vec( char *message_hex_string, int digest,
                       int mod, int radix_N, char *input_N, int radix_E,
                       char *input_E, char *result_hex_str,
                       int pk_type, int mgf1_hash_id, int salt_len,
                       int result )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char result_str[1000];
    rsa_context *rsa;
    pk_context pk;
    pk_rsassa_pss_options pss_opts;
    void *options;
    int msg_len;
    size_t hash_len;

    pk_init( &pk );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( POLARSSL_PK_RSA ) ) == 0 );
    rsa = pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    msg_len = unhexify( message_str, message_hex_string );
    unhexify( result_str, result_hex_str );

    if( digest != POLARSSL_MD_NONE )
    {
        TEST_ASSERT( md( md_info_from_type( digest ),
                     message_str, msg_len, hash_result ) == 0 );
        hash_len = 0;
    }
    else
    {
        memcpy( hash_result, message_str, msg_len );
        hash_len = msg_len;
    }

    if( mgf1_hash_id < 0 )
    {
        options = NULL;
    }
    else
    {
        options = &pss_opts;

        pss_opts.mgf1_hash_id = mgf1_hash_id;
        pss_opts.expected_salt_len = salt_len;
    }

    TEST_ASSERT( pk_verify_ext( pk_type, options, &pk,
                                digest, hash_result, hash_len,
                                result_str, pk_get_len( &pk ) ) == result );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_ECDSA_C */
void pk_ec_test_vec( int type, int id, char *key_str,
                     char *hash_str, char * sig_str, int ret )
{
    pk_context pk;
    ecp_keypair *eckey;
    unsigned char hash[100], sig[500], key[500];
    size_t hash_len, sig_len, key_len;

    pk_init( &pk );

    memset( hash, 0, sizeof( hash ) );  hash_len = unhexify(hash, hash_str);
    memset( sig, 0, sizeof( sig ) );    sig_len = unhexify(sig, sig_str);
    memset( key, 0, sizeof( key ) );    key_len = unhexify(key, key_str);

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( type ) ) == 0 );

    TEST_ASSERT( pk_can_do( &pk, POLARSSL_PK_ECDSA ) );
    eckey = pk_ec( pk );

    TEST_ASSERT( ecp_use_known_dp( &eckey->grp, id ) == 0 );
    TEST_ASSERT( ecp_point_read_binary( &eckey->grp, &eckey->Q,
                                        key, key_len ) == 0 );

    TEST_ASSERT( pk_verify( &pk, POLARSSL_MD_NONE,
                            hash, hash_len, sig, sig_len ) == ret );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE */
void pk_sign_verify( int type, int sign_ret, int verify_ret )
{
    pk_context pk;
    unsigned char hash[50], sig[5000];
    size_t sig_len;

    pk_init( &pk );

    memset( hash, 0x2a, sizeof hash );
    memset( sig, 0, sizeof sig );

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( type ) ) == 0 );
    TEST_ASSERT( pk_genkey( &pk ) == 0 );

    TEST_ASSERT( pk_sign( &pk, POLARSSL_MD_NONE, hash, sizeof hash,
                          sig, &sig_len, rnd_std_rand, NULL ) == sign_ret );

    TEST_ASSERT( pk_verify( &pk, POLARSSL_MD_NONE,
                            hash, sizeof hash, sig, sig_len ) == verify_ret );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_RSA_C */
void pk_rsa_encrypt_test_vec( char *message_hex, int mod,
                            int radix_N, char *input_N,
                            int radix_E, char *input_E,
                            char *result_hex, int ret )
{
    unsigned char message[1000];
    unsigned char output[1000];
    unsigned char result[1000];
    size_t msg_len, olen, res_len;
    rnd_pseudo_info rnd_info;
    rsa_context *rsa;
    pk_context pk;

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( message,    0, sizeof( message ) );
    memset( output,     0, sizeof( output ) );
    memset( result,     0, sizeof( result ) );

    msg_len = unhexify( message, message_hex );
    res_len = unhexify( result, result_hex );

    pk_init( &pk );
    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( POLARSSL_PK_RSA ) ) == 0 );
    rsa = pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    TEST_ASSERT( pk_encrypt( &pk, message, msg_len,
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );
    TEST_ASSERT( olen == res_len );
    TEST_ASSERT( memcmp( output, result, olen ) == 0 );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_RSA_C */
void pk_rsa_decrypt_test_vec( char *cipher_hex, int mod,
                            int radix_P, char *input_P,
                            int radix_Q, char *input_Q,
                            int radix_N, char *input_N,
                            int radix_E, char *input_E,
                            char *clear_hex, int ret )
{
    unsigned char clear[1000];
    unsigned char output[1000];
    unsigned char cipher[1000];
    size_t clear_len, olen, cipher_len;
    rnd_pseudo_info rnd_info;
    mpi P1, Q1, H, G;
    rsa_context *rsa;
    pk_context pk;

    pk_init( &pk );
    mpi_init( &P1 ); mpi_init( &Q1 ); mpi_init( &H ); mpi_init( &G );

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( clear,      0, sizeof( clear ) );
    memset( cipher,     0, sizeof( cipher ) );

    clear_len = unhexify( clear, clear_hex );
    cipher_len = unhexify( cipher, cipher_hex );

    /* init pk-rsa context */
    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( POLARSSL_PK_RSA ) ) == 0 );
    rsa = pk_rsa( pk );

    /* load public key */
    rsa->len = mod / 8;
    TEST_ASSERT( mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    /* load private key */
    TEST_ASSERT( mpi_read_string( &rsa->P, radix_P, input_P ) == 0 );
    TEST_ASSERT( mpi_read_string( &rsa->Q, radix_Q, input_Q ) == 0 );
    TEST_ASSERT( mpi_sub_int( &P1, &rsa->P, 1 ) == 0 );
    TEST_ASSERT( mpi_sub_int( &Q1, &rsa->Q, 1 ) == 0 );
    TEST_ASSERT( mpi_mul_mpi( &H, &P1, &Q1 ) == 0 );
    TEST_ASSERT( mpi_gcd( &G, &rsa->E, &H  ) == 0 );
    TEST_ASSERT( mpi_inv_mod( &rsa->D , &rsa->E, &H  ) == 0 );
    TEST_ASSERT( mpi_mod_mpi( &rsa->DP, &rsa->D, &P1 ) == 0 );
    TEST_ASSERT( mpi_mod_mpi( &rsa->DQ, &rsa->D, &Q1 ) == 0 );
    TEST_ASSERT( mpi_inv_mod( &rsa->QP, &rsa->Q, &rsa->P ) == 0 );

    /* decryption test */
    memset( output, 0, sizeof( output ) );
    olen = 0;
    TEST_ASSERT( pk_decrypt( &pk, cipher, cipher_len,
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );
    if( ret == 0 )
    {
        TEST_ASSERT( olen == clear_len );
        TEST_ASSERT( memcmp( output, clear, olen ) == 0 );
    }

exit:
    mpi_free( &P1 ); mpi_free( &Q1 ); mpi_free( &H ); mpi_free( &G );
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE */
void pk_ec_nocrypt( int type )
{
    pk_context pk;
    unsigned char output[100];
    unsigned char input[100];
    rnd_pseudo_info rnd_info;
    size_t olen = 0;
    int ret = POLARSSL_ERR_PK_TYPE_MISMATCH;

    pk_init( &pk );

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( output,     0, sizeof( output ) );
    memset( input,      0, sizeof( input ) );

    TEST_ASSERT( pk_init_ctx( &pk, pk_info_from_type( type ) ) == 0 );

    TEST_ASSERT( pk_encrypt( &pk, input, sizeof( input ),
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );

    TEST_ASSERT( pk_decrypt( &pk, input, sizeof( input ),
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );

exit:
    pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:POLARSSL_RSA_C */
void pk_rsa_alt( )
{
    /*
     * An rsa_alt context can only do private operations (decrypt, sign).
     * Test it against the public operations (encrypt, verify) of a
     * corresponding rsa context.
     */
    rsa_context raw;
    pk_context rsa, alt;
    pk_debug_item dbg_items[10];
    unsigned char hash[50], sig[1000];
    unsigned char msg[50], ciph[1000], test[1000];
    size_t sig_len, ciph_len, test_len;
    int ret = POLARSSL_ERR_PK_TYPE_MISMATCH;

    rsa_init( &raw, RSA_PKCS_V15, POLARSSL_MD_NONE );
    pk_init( &rsa ); pk_init( &alt );

    memset( hash, 0x2a, sizeof hash );
    memset( sig, 0, sizeof sig );
    memset( msg, 0x2a, sizeof msg );
    memset( ciph, 0, sizeof ciph );
    memset( test, 0, sizeof test );

    /* Initiliaze PK RSA context with random key */
    TEST_ASSERT( pk_init_ctx( &rsa,
                              pk_info_from_type( POLARSSL_PK_RSA ) ) == 0 );
    TEST_ASSERT( pk_genkey( &rsa ) == 0 );

    /* Extract key to the raw rsa context */
    TEST_ASSERT( rsa_copy( &raw, pk_rsa( rsa ) ) == 0 );

    /* Initialize PK RSA_ALT context */
    TEST_ASSERT( pk_init_ctx_rsa_alt( &alt, (void *) &raw,
                 rsa_decrypt_func, rsa_sign_func, rsa_key_len_func ) == 0 );

    /* Test administrative functions */
    TEST_ASSERT( pk_can_do( &alt, POLARSSL_PK_RSA ) );
    TEST_ASSERT( pk_get_size( &alt ) == RSA_KEY_SIZE );
    TEST_ASSERT( pk_get_len( &alt ) == RSA_KEY_LEN );
    TEST_ASSERT( pk_get_type( &alt ) == POLARSSL_PK_RSA_ALT );
    TEST_ASSERT( strcmp( pk_get_name( &alt ), "RSA-alt" ) == 0 );

    /* Test signature */
    TEST_ASSERT( pk_sign( &alt, POLARSSL_MD_NONE, hash, sizeof hash,
                          sig, &sig_len, rnd_std_rand, NULL ) == 0 );
    TEST_ASSERT( sig_len == RSA_KEY_LEN );
    TEST_ASSERT( pk_verify( &rsa, POLARSSL_MD_NONE,
                            hash, sizeof hash, sig, sig_len ) == 0 );

    /* Test decrypt */
    TEST_ASSERT( pk_encrypt( &rsa, msg, sizeof msg,
                             ciph, &ciph_len, sizeof ciph,
                             rnd_std_rand, NULL ) == 0 );
    TEST_ASSERT( pk_decrypt( &alt, ciph, ciph_len,
                             test, &test_len, sizeof test,
                             rnd_std_rand, NULL ) == 0 );
    TEST_ASSERT( test_len == sizeof msg );
    TEST_ASSERT( memcmp( test, msg, test_len ) == 0 );

    /* Test forbidden operations */
    TEST_ASSERT( pk_encrypt( &alt, msg, sizeof msg,
                             ciph, &ciph_len, sizeof ciph,
                             rnd_std_rand, NULL ) == ret );
    TEST_ASSERT( pk_verify( &alt, POLARSSL_MD_NONE,
                            hash, sizeof hash, sig, sig_len ) == ret );
    TEST_ASSERT( pk_debug( &alt, dbg_items ) == ret );

exit:
    rsa_free( &raw );
    pk_free( &rsa ); pk_free( &alt );
}
/* END_CASE */