SHAKE

Digest

To test a SHAKE implementation, the function must conform to one of these conventions:

CC_SHAKE_128_digest[_bit]

CC_SHAKE_256_digest[_bit]

• bit is an optional parameter. If present, the implementation is considered to be bit-oriented. By default, it is considered byte-oriented.

Its signature must be:

void SHAKE_digest(

uint8_t *digest,

size_t digest_size,

const uint8_t *input,

size_t input_size,

)

Produces digests of arbitrary length.

Parameters:

• digest – [Out] A buffer to store the resulting digest.

• digest_size – [In] The desired size of the digest.

• input – [In] The input data.

• input_size – [In] The size of the input data in bytes.

Examples:

• SHAKE128:

void CC_SHAKE_128_digest(uint8_t *digest, size_t digest_size,
                        const uint8_t *input, size_t input_size);

• SHAKE256:

void CC_SHAKE_256_digest(uint8_t *digest, size_t digest_size,
                        const uint8_t *input, size_t input_size);

• Bit-oriented SHAKE256:

void CC_SHAKE_256_digest_bit(uint8_t *digest, size_t digest_size,
                            const uint8_t *input, size_t input_size);