BEGIN_HEADER
#include <polarssl/cipher.h>
END_HEADER

BEGIN_CASE
enc_dec_buf:cipher_id:cipher_string:key_len:length:
    size_t length = {length};
    unsigned char key[32];
    unsigned char iv[16];

    const cipher_info_t *cipher_info;
    cipher_context_t ctx_dec;
    cipher_context_t ctx_enc;

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

    size_t outlen = 0;
    size_t enclen = 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 );

    /* 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 ) );

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

    enclen = cipher_get_block_size( &ctx_enc )
                    * ( 1 + length / cipher_get_block_size( &ctx_enc ) );

    /* encode length number of bytes from inbuf */
    TEST_ASSERT( 0 == cipher_update( &ctx_enc, inbuf, length, encbuf, &outlen ) );
    TEST_ASSERT( outlen == enclen - cipher_get_block_size ( &ctx_enc ) );
    TEST_ASSERT( 0 == cipher_finish( &ctx_enc, encbuf + outlen, &outlen ) );
    TEST_ASSERT( outlen == cipher_get_block_size ( &ctx_enc ) );

    /* decode the previously encoded string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, enclen, decbuf, &outlen ) );
    TEST_ASSERT( enclen - cipher_get_block_size ( &ctx_enc ) == outlen );
    TEST_ASSERT( 0 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
    TEST_ASSERT( length - enclen + cipher_get_block_size ( &ctx_enc ) == outlen );

    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
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 enc and dec contexts */
    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_reset( &ctx_dec, iv ) );

    /* decode 0-byte string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, 0, decbuf, &outlen ) );
    TEST_ASSERT( 0 == outlen );
    TEST_ASSERT( 1 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
    TEST_ASSERT( 0 == outlen );

    TEST_ASSERT( 0 == cipher_free_ctx( &ctx_dec ) );
END_CASE

BEGIN_CASE
enc_dec_buf_multipart:cipher_id:key_len:first_length:second_length:
    size_t first_length = {first_length};
    size_t second_length = {second_length};
    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;
    size_t enclen = 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_reset( &ctx_dec, iv ) );
    TEST_ASSERT( 0 == cipher_reset( &ctx_enc, iv ) );

    enclen = cipher_get_block_size(&ctx_enc )
                    * ( 1 + length / cipher_get_block_size( &ctx_enc ) );

    /* 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 == enclen - cipher_get_block_size ( &ctx_enc ) );
    TEST_ASSERT( 0 == cipher_finish( &ctx_enc, encbuf + totaloutlen, &outlen ) );
    totaloutlen += outlen;
    TEST_ASSERT( outlen == cipher_get_block_size ( &ctx_enc ) );

    /* decode the previously encoded string */
    TEST_ASSERT( 0 == cipher_update( &ctx_dec, encbuf, enclen, decbuf, &outlen ) );
    TEST_ASSERT( enclen - cipher_get_block_size ( &ctx_enc ) == outlen );
    TEST_ASSERT( 0 == cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
    TEST_ASSERT( length - enclen + cipher_get_block_size ( &ctx_enc ) == outlen );
    

    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
cipher_selftest:
{
    TEST_ASSERT( cipher_self_test( 0 ) == 0 );
}
END_CASE