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

#if defined(POLARSSL_GCM_C)
#include <polarssl/gcm.h>
#endif
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:POLARSSL_CIPHER_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void enc_dec_buf( int cipher_id, char *cipher_string, int key_len,
                  int length_val, int pad_mode )
{
    size_t length = length_val, outlen, total_len, i;
    unsigned char key[32];
    unsigned char iv[16];
    unsigned char ad[13];
    unsigned char tag[16];
    unsigned char inbuf[64];
    unsigned char encbuf[64];
    unsigned char decbuf[64];

    const cipher_info_t *cipher_info;
    cipher_context_t ctx_dec;
    cipher_context_t ctx_enc;

    /*
     * Prepare contexts
     */
    memset( &ctx_dec, 0, sizeof( ctx_dec ) );
    memset( &ctx_enc, 0, sizeof( ctx_enc ) );

    memset( key, 0x2a, sizeof( key ) );

    /* Check and get info structures */
    cipher_info = cipher_info_from_type( cipher_id );
    TEST_ASSERT( NULL != cipher_info );
    TEST_ASSERT( cipher_info_from_string( cipher_string ) == cipher_info );

    /* Initialise enc and dec contexts */
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx_dec, cipher_info ) );
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx_enc, cipher_info ) );

    TEST_ASSERT( 0 == cipher_setkey( &ctx_dec, key, key_len, POLARSSL_DECRYPT ) );
    TEST_ASSERT( 0 == cipher_setkey( &ctx_enc, key, key_len, POLARSSL_ENCRYPT ) );

    if( -1 != pad_mode )
    {
        TEST_ASSERT( 0 == cipher_set_padding_mode( &ctx_dec, pad_mode ) );
        TEST_ASSERT( 0 == cipher_set_padding_mode( &ctx_enc, pad_mode ) );
    }

    /*
     * Do a few encode/decode cycles
     */
    for( i = 0; i < 3; i++ )
    {
    memset( iv , 0x00 + i, sizeof( iv ) );
    memset( ad, 0x10 + i, sizeof( ad ) );
    memset( inbuf, 0x20 + i, sizeof( inbuf ) );

    memset( encbuf, 0, sizeof( encbuf ) );
    memset( decbuf, 0, sizeof( decbuf ) );
    memset( tag, 0, sizeof( tag ) );

    TEST_ASSERT( 0 == cipher_set_iv( &ctx_dec, iv, sizeof( iv ) ) );
    TEST_ASSERT( 0 == cipher_set_iv( &ctx_enc, iv, sizeof( iv ) ) );

    TEST_ASSERT( 0 == cipher_reset( &ctx_dec ) );
    TEST_ASSERT( 0 == cipher_reset( &ctx_enc ) );

#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_update_ad( &ctx_dec, ad, sizeof( ad ) - i ) );
    TEST_ASSERT( 0 == cipher_update_ad( &ctx_enc, ad, sizeof( ad ) - i ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* encode length number of bytes from inbuf */
    TEST_ASSERT( 0 == cipher_update( &ctx_enc, inbuf, length, encbuf, &outlen ) );
    total_len = outlen;

    TEST_ASSERT( total_len == length ||
                 ( total_len % cipher_get_block_size( &ctx_enc ) == 0 &&
                   total_len < length &&
                   total_len + cipher_get_block_size( &ctx_enc ) > length ) );

    TEST_ASSERT( 0 == cipher_finish( &ctx_enc, encbuf + outlen, &outlen ) );
    total_len += outlen;

#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_write_tag( &ctx_enc, tag, sizeof( tag ) ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    TEST_ASSERT( total_len == length ||
                 ( total_len % cipher_get_block_size( &ctx_enc ) == 0 &&
                   total_len > length &&
                   total_len <= length + cipher_get_block_size( &ctx_enc ) ) );

    /* decode the previously encoded string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, total_len, decbuf, &outlen ) );
    total_len = outlen;

    TEST_ASSERT( total_len == length ||
                 ( total_len % cipher_get_block_size( &ctx_dec ) == 0 &&
                   total_len < length &&
                   total_len + cipher_get_block_size( &ctx_dec ) >= length ) );

    TEST_ASSERT( 0 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
    total_len += outlen;

#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_check_tag( &ctx_dec, tag, sizeof( tag ) ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* check result */
    TEST_ASSERT( total_len == length );
    TEST_ASSERT( 0 == memcmp(inbuf, decbuf, length) );
    }

    /*
     * Done
     */
    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_dec ) );
    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_enc ) );
}
/* END_CASE */

/* BEGIN_CASE */
void enc_fail( int cipher_id, int pad_mode, int key_len,
               int length_val, int ret )
{
    size_t length = length_val;
    unsigned char key[32];
    unsigned char iv[16];

    const cipher_info_t *cipher_info;
    cipher_context_t ctx;

    unsigned char inbuf[64];
    unsigned char encbuf[64];

    size_t outlen = 0;

    memset( key, 0, 32 );
    memset( iv , 0, 16 );

    memset( &ctx, 0, sizeof( ctx ) );

    memset( inbuf, 5, 64 );
    memset( encbuf, 0, 64 );

    /* Check and get info structures */
    cipher_info = cipher_info_from_type( cipher_id );
    TEST_ASSERT( NULL != cipher_info );

    /* Initialise context */
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx, cipher_info ) );
    TEST_ASSERT( 0 == cipher_setkey( &ctx, key, key_len, POLARSSL_ENCRYPT ) );
    TEST_ASSERT( 0 == cipher_set_padding_mode( &ctx, pad_mode ) );
    TEST_ASSERT( 0 == cipher_set_iv( &ctx, iv, 16 ) );
    TEST_ASSERT( 0 == cipher_reset( &ctx ) );
#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_update_ad( &ctx, NULL, 0 ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* encode length number of bytes from inbuf */
    TEST_ASSERT( 0 == cipher_update( &ctx, inbuf, length, encbuf, &outlen ) );
    TEST_ASSERT( ret == cipher_finish( &ctx, encbuf + outlen, &outlen ) );

    /* done */
    TEST_ASSERT( 0 == cipher_free_ctx( &ctx ) );
}
/* END_CASE */

/* BEGIN_CASE */
void dec_empty_buf()
{
    unsigned char key[32];
    unsigned char iv[16];

    cipher_context_t ctx_dec;
    const cipher_info_t *cipher_info;

    unsigned char encbuf[64];
    unsigned char decbuf[64];

    size_t outlen = 0;

    memset( key, 0, 32 );
    memset( iv , 0, 16 );
    
    memset( &ctx_dec, 0, sizeof( ctx_dec ) );
    
    memset( encbuf, 0, 64 );
    memset( decbuf, 0, 64 );

    /* Initialise context */
    cipher_info = cipher_info_from_type( POLARSSL_CIPHER_AES_128_CBC );
    TEST_ASSERT( NULL != cipher_info);
    
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx_dec, cipher_info ) );

    TEST_ASSERT( 0 == cipher_setkey( &ctx_dec, key, 128, POLARSSL_DECRYPT ) );

    TEST_ASSERT( 0 == cipher_set_iv( &ctx_dec, iv, 16 ) );

    TEST_ASSERT( 0 == cipher_reset( &ctx_dec ) );

#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_update_ad( &ctx_dec, NULL, 0 ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* decode 0-byte string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, 0, decbuf, &outlen ) );
    TEST_ASSERT( 0 == outlen );
    TEST_ASSERT( POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED == cipher_finish(
                 &ctx_dec, decbuf + outlen, &outlen ) );
    TEST_ASSERT( 0 == outlen );

    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_dec ) );
}
/* END_CASE */

/* BEGIN_CASE */
void enc_dec_buf_multipart( int cipher_id, int key_len, int first_length_val,
                            int second_length_val )
{
    size_t first_length = first_length_val;
    size_t second_length = second_length_val;
    size_t length = first_length + second_length;
    unsigned char key[32];
    unsigned char iv[16];

    cipher_context_t ctx_dec;
    cipher_context_t ctx_enc;
    const cipher_info_t *cipher_info;

    unsigned char inbuf[64];
    unsigned char encbuf[64];
    unsigned char decbuf[64];

    size_t outlen = 0;
    size_t totaloutlen = 0;

    memset( key, 0, 32 );
    memset( iv , 0, 16 );
    
    memset( &ctx_dec, 0, sizeof( ctx_dec ) );
    memset( &ctx_enc, 0, sizeof( ctx_enc ) );
        
    memset( inbuf, 5, 64 );
    memset( encbuf, 0, 64 );
    memset( decbuf, 0, 64 );

    /* Initialise enc and dec contexts */
    cipher_info = cipher_info_from_type( cipher_id );
    TEST_ASSERT( NULL != cipher_info);
    
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx_dec, cipher_info ) );
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx_enc, cipher_info ) );
    
    TEST_ASSERT( 0 == cipher_setkey( &ctx_dec, key, key_len, POLARSSL_DECRYPT ) );
    TEST_ASSERT( 0 == cipher_setkey( &ctx_enc, key, key_len, POLARSSL_ENCRYPT ) );

    TEST_ASSERT( 0 == cipher_set_iv( &ctx_dec, iv, 16 ) );
    TEST_ASSERT( 0 == cipher_set_iv( &ctx_enc, iv, 16 ) );

    TEST_ASSERT( 0 == cipher_reset( &ctx_dec ) );
    TEST_ASSERT( 0 == cipher_reset( &ctx_enc ) );

#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_update_ad( &ctx_dec, NULL, 0 ) );
    TEST_ASSERT( 0 == cipher_update_ad( &ctx_enc, NULL, 0 ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* encode length number of bytes from inbuf */
    TEST_ASSERT( 0 == cipher_update( &ctx_enc, inbuf, first_length, encbuf, &outlen ) );
    totaloutlen = outlen;
    TEST_ASSERT( 0 == cipher_update( &ctx_enc, inbuf + first_length, second_length, encbuf + totaloutlen, &outlen ) );
    totaloutlen += outlen;
    TEST_ASSERT( totaloutlen == length ||
                 ( totaloutlen % cipher_get_block_size( &ctx_enc ) == 0 &&
                   totaloutlen < length &&
                   totaloutlen + cipher_get_block_size( &ctx_enc ) > length ) );

    TEST_ASSERT( 0 == cipher_finish( &ctx_enc, encbuf + totaloutlen, &outlen ) );
    totaloutlen += outlen;
    TEST_ASSERT( totaloutlen == length ||
                 ( totaloutlen % cipher_get_block_size( &ctx_enc ) == 0 &&
                   totaloutlen > length &&
                   totaloutlen <= length + cipher_get_block_size( &ctx_enc ) ) );

    /* decode the previously encoded string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, totaloutlen, decbuf, &outlen ) );
    totaloutlen = outlen;

    TEST_ASSERT( totaloutlen == length ||
                 ( totaloutlen % cipher_get_block_size( &ctx_dec ) == 0 &&
                   totaloutlen < length &&
                   totaloutlen + cipher_get_block_size( &ctx_dec ) >= length ) );

    TEST_ASSERT( 0 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
    totaloutlen += outlen;

    TEST_ASSERT( totaloutlen == length );

    TEST_ASSERT( 0 == memcmp(inbuf, decbuf, length) );

    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_dec ) );
    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_enc ) );
}
/* END_CASE */

/* BEGIN_CASE */
void decrypt_test_vec( int cipher_id, int pad_mode,
                       char *hex_key, char *hex_iv,
                       char *hex_cipher, char *hex_clear,
                       char *hex_ad, char *hex_tag,
                       int finish_result, int tag_result )
{
    unsigned char key[50];
    unsigned char iv[50];
    unsigned char cipher[200];
    unsigned char clear[200];
    unsigned char ad[200];
    unsigned char tag[20];
    size_t key_len, iv_len, cipher_len, clear_len, ad_len, tag_len;
    cipher_context_t ctx;
    unsigned char output[200];
    size_t outlen, total_len;

    memset( key, 0x00, sizeof( key ) );
    memset( iv, 0x00, sizeof( iv ) );
    memset( cipher, 0x00, sizeof( cipher ) );
    memset( clear, 0x00, sizeof( clear ) );
    memset( ad, 0x00, sizeof( ad ) );
    memset( tag, 0x00, sizeof( tag ) );
    memset( output, 0x00, sizeof( output ) );

    key_len = unhexify( key, hex_key );
    iv_len = unhexify( iv, hex_iv );
    cipher_len = unhexify( cipher, hex_cipher );
    clear_len = unhexify( clear, hex_clear );
    ad_len = unhexify( ad, hex_ad );
    tag_len = unhexify( tag, hex_tag );

    /* Prepare context */
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx,
                                       cipher_info_from_type( cipher_id ) ) );
    TEST_ASSERT( 0 == cipher_setkey( &ctx, key, 8 * key_len, POLARSSL_DECRYPT ) );
    if( pad_mode != -1 )
        TEST_ASSERT( 0 == cipher_set_padding_mode( &ctx, pad_mode ) );
    TEST_ASSERT( 0 == cipher_set_iv( &ctx, iv, iv_len ) );
    TEST_ASSERT( 0 == cipher_reset( &ctx ) );
#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( 0 == cipher_update_ad( &ctx, ad, ad_len ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* decode buffer and check tag */
    total_len = 0;
    TEST_ASSERT( 0 == cipher_update( &ctx, cipher, cipher_len, output, &outlen ) );
    total_len += outlen;
    TEST_ASSERT( finish_result == cipher_finish( &ctx, output + outlen,
                                                 &outlen ) );
    total_len += outlen;
#if defined(POLARSSL_CIPHER_MODE_AEAD)
    TEST_ASSERT( tag_result == cipher_check_tag( &ctx, tag, tag_len ) );
#endif /* POLARSSL_CIPHER_MODE_AEAD */

    /* check plaintext only if everything went fine */
    if( 0 == finish_result && 0 == tag_result )
    {
        TEST_ASSERT( total_len == clear_len );
        TEST_ASSERT( 0 == memcmp( output, clear, clear_len ) );
    }

    cipher_free_ctx( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void set_padding( int cipher_id, int pad_mode, int ret )
{
    const cipher_info_t *cipher_info;
    cipher_context_t ctx;

    cipher_info = cipher_info_from_type( cipher_id );
    TEST_ASSERT( NULL != cipher_info );
    TEST_ASSERT( 0 == cipher_init_ctx( &ctx, cipher_info ) );

    TEST_ASSERT( ret == cipher_set_padding_mode( &ctx, pad_mode ) );

    TEST_ASSERT( 0 == cipher_free_ctx( &ctx ) );
}
/* END_CASE */

/* BEGIN_CASE */
void check_padding( int pad_mode, char *input_str, int ret, int dlen_check )
{
    cipher_info_t cipher_info;
    cipher_context_t ctx;
    unsigned char input[16];
    size_t ilen, dlen;

    /* build a fake context just for getting access to get_padding */
    memset( &ctx, 0, sizeof( ctx ) );
    cipher_info.mode = POLARSSL_MODE_CBC;
    ctx.cipher_info = &cipher_info;

    TEST_ASSERT( 0 == cipher_set_padding_mode( &ctx, pad_mode ) );

    ilen = unhexify( input, input_str );

    TEST_ASSERT( ret == ctx.get_padding( input, ilen, &dlen ) );
    if( 0 == ret )
        TEST_ASSERT( dlen == (size_t) dlen_check );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_selftest()
{
    TEST_ASSERT( cipher_self_test( 0 ) == 0 );
}
/* END_CASE */