/* BEGIN_HEADER */
#include "mbedtls/chachapoly.h"
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_CHACHAPOLY_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void mbedtls_chachapoly_enc( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string )
{
    unsigned char key_str[32]; /* size set by the standard */
    unsigned char nonce_str[12]; /* size set by the standard */
    unsigned char aad_str[12]; /* max size of test data so far */
    unsigned char input_str[265]; /* max size of binary input/output so far */
    unsigned char output_str[265];
    unsigned char output[265];
    unsigned char mac_str[16]; /* size set by the standard */
    unsigned char mac[16]; /* size set by the standard */
    size_t input_len;
    size_t output_len;
    size_t aad_len;
    size_t key_len;
    size_t nonce_len;
    size_t mac_len;
    mbedtls_chachapoly_context ctx;

    memset( key_str,    0x00, sizeof( key_str ) );
    memset( nonce_str,  0x00, sizeof( nonce_str ) );
    memset( aad_str,    0x00, sizeof( aad_str ) );
    memset( input_str,  0x00, sizeof( input_str ) );
    memset( output_str, 0x00, sizeof( output_str ) );
    memset( mac_str,    0x00, sizeof( mac_str ) );

    aad_len    = unhexify( aad_str,    hex_aad_string    );
    input_len  = unhexify( input_str,  hex_input_string  );
    output_len = unhexify( output_str, hex_output_string );
    key_len    = unhexify( key_str,    hex_key_string    );
    nonce_len  = unhexify( nonce_str,  hex_nonce_string  );
    mac_len    = unhexify( mac_str,    hex_mac_string    );

    TEST_ASSERT( key_len   == 32 );
    TEST_ASSERT( nonce_len == 12 );
    TEST_ASSERT( mac_len   == 16 );

    mbedtls_chachapoly_init( &ctx );

    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );

    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      input_len, nonce_str,
                                      aad_str, aad_len,
                                      input_str, output, mac ) == 0 );

    TEST_ASSERT( memcmp( output_str, output, output_len ) == 0 );
    TEST_ASSERT( memcmp( mac_str, mac, 16U ) == 0 );

exit:
    mbedtls_chachapoly_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_chachapoly_dec( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string, int ret_exp )
{
    unsigned char key_str[32]; /* size set by the standard */
    unsigned char nonce_str[12]; /* size set by the standard */
    unsigned char aad_str[12]; /* max size of test data so far */
    unsigned char input_str[265]; /* max size of binary input/output so far */
    unsigned char output_str[265];
    unsigned char output[265];
    unsigned char mac_str[16]; /* size set by the standard */
    size_t input_len;
    size_t output_len;
    size_t aad_len;
    size_t key_len;
    size_t nonce_len;
    size_t mac_len;
    int ret;
    mbedtls_chachapoly_context ctx;

    memset( key_str,    0x00, sizeof( key_str ) );
    memset( nonce_str,  0x00, sizeof( nonce_str ) );
    memset( aad_str,    0x00, sizeof( aad_str ) );
    memset( input_str,  0x00, sizeof( input_str ) );
    memset( output_str, 0x00, sizeof( output_str ) );
    memset( mac_str,    0x00, sizeof( mac_str ) );

    aad_len    = unhexify( aad_str,    hex_aad_string    );
    input_len  = unhexify( input_str,  hex_input_string  );
    output_len = unhexify( output_str, hex_output_string );
    key_len    = unhexify( key_str,    hex_key_string    );
    nonce_len  = unhexify( nonce_str,  hex_nonce_string  );
    mac_len    = unhexify( mac_str,    hex_mac_string    );

    TEST_ASSERT( key_len   == 32 );
    TEST_ASSERT( nonce_len == 12 );
    TEST_ASSERT( mac_len   == 16 );

    mbedtls_chachapoly_init( &ctx );

    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );

    ret = mbedtls_chachapoly_auth_decrypt( &ctx,
                                           input_len, nonce_str,
                                           aad_str, aad_len,
                                           mac_str, input_str, output );

    TEST_ASSERT( ret == ret_exp );
    if( ret_exp == 0 )
    {
        TEST_ASSERT( memcmp( output_str, output, output_len ) == 0 );
    }

exit:
    mbedtls_chachapoly_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void chachapoly_bad_params()
{
    unsigned char key[32];
    unsigned char nonce[12];
    unsigned char aad[1];
    unsigned char input[1];
    unsigned char output[1];
    unsigned char mac[16];
    size_t input_len = sizeof( input );
    size_t aad_len = sizeof( aad );
    mbedtls_chachapoly_context ctx;

    memset( key,    0x00, sizeof( key ) );
    memset( nonce,  0x00, sizeof( nonce ) );
    memset( aad,    0x00, sizeof( aad ) );
    memset( input,  0x00, sizeof( input ) );
    memset( output, 0x00, sizeof( output ) );
    memset( mac,    0x00, sizeof( mac ) );

    mbedtls_chachapoly_init( NULL );
    mbedtls_chachapoly_free( NULL );

    mbedtls_chachapoly_init( &ctx );

    TEST_ASSERT( mbedtls_chachapoly_setkey( NULL, key )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, NULL )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( NULL,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      0, nonce,
                                      aad, 0,
                                      input, output, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      0, NULL,
                                      aad, 0,
                                      input, output, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      0, nonce,
                                      NULL, aad_len,
                                      input, output, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      input_len, nonce,
                                      aad, 0,
                                      NULL, output, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      input_len, nonce,
                                      aad, 0,
                                      input, NULL, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      0, nonce,
                                      aad, 0,
                                      input, output, NULL )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( NULL,
                                           0, nonce,
                                           aad, 0,
                                           mac, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           0, NULL,
                                           aad, 0,
                                           mac, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           0, nonce,
                                           NULL, aad_len,
                                           mac, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           0, nonce,
                                           aad, 0,
                                           NULL, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           input_len, nonce,
                                           aad, 0,
                                           mac, NULL, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           input_len, nonce,
                                           aad, 0,
                                           mac, input, NULL )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      0, nonce,
                                      aad, aad_len,
                                      NULL, NULL, mac )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           0, nonce,
                                           aad, aad_len,
                                           mac, NULL, NULL )
                 == 0 );

    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
                                      input_len, nonce,
                                      NULL, 0,
                                      input, output, mac )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
                                           input_len, nonce,
                                           NULL, 0,
                                           mac, input, output )
                 == 0 );

    TEST_ASSERT( mbedtls_chachapoly_starts( NULL, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, NULL, MBEDTLS_CHACHAPOLY_ENCRYPT )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_update_aad( NULL, aad, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, NULL, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_update( NULL, input_len, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, NULL, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, NULL )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_chachapoly_finish( NULL, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, NULL )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );

exit:
    mbedtls_chachapoly_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void chachapoly_state()
{
    unsigned char key[32];
    unsigned char nonce[12];
    unsigned char aad[1];
    unsigned char input[1];
    unsigned char output[1];
    unsigned char mac[16];
    size_t input_len = sizeof( input );
    size_t aad_len = sizeof( aad );
    mbedtls_chachapoly_context ctx;

    memset( key,    0x00, sizeof( key ) );
    memset( nonce,  0x00, sizeof( nonce ) );
    memset( aad,    0x00, sizeof( aad ) );
    memset( input,  0x00, sizeof( input ) );
    memset( output, 0x00, sizeof( output ) );
    memset( mac,    0x00, sizeof( mac ) );

    /* Initial state: finish, update, update_aad forbidden */
    mbedtls_chachapoly_init( &ctx );

    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );

    /* Still initial state: finish, update, update_aad forbidden */
    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key )
                 == 0 );

    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );

    /* Starts -> finish OK */
    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
                 == 0 );

    /* After finish: update, update_aad forbidden */
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );

    /* Starts -> update* OK */
    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
                 == 0 );

    /* After update: update_aad forbidden */
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );

    /* Starts -> update_aad* -> finish OK */
    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
                 == 0 );
    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
                 == 0 );

exit:
    mbedtls_chachapoly_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void chachapoly_selftest()
{
    TEST_ASSERT( mbedtls_chachapoly_self_test( 1 ) == 0 );
}
/* END_CASE */