diff options
Diffstat (limited to 'sha3.c')
| -rw-r--r-- | sha3.c | 130 |
1 files changed, 58 insertions, 72 deletions
@@ -513,21 +513,25 @@ static inline size_t absorb(sha3_state_t * const a, size_t num_bytes, const size return num_bytes; } +// get hash rate +// +// note: in hash functions, the capacity is always 2 times the +// destination length, and the rate is the total state size minus the +// capacity. +#define HASH_RATE(len) (200 - 2 * (len)) + // one-shot sha3 hash. static inline void hash_once(const uint8_t *m, size_t m_len, uint8_t * const dst, const size_t dst_len) { - // in the sha3 hash functions, the capacity is always 2 times the - // destination length, and the rate is the total state size minus the - // capacity - const size_t rate = 200 - 2 * dst_len; - + // init state sha3_state_t a = { .u64 = { 0 } }; - const size_t len = absorb(&a, 0, rate, SHA3_NUM_ROUNDS, m, m_len); + // absorb message + const size_t len = absorb(&a, 0, HASH_RATE(dst_len), SHA3_NUM_ROUNDS, m, m_len); // append suffix and padding // (note: suffix and padding are ambiguous in spec) a.u8[len] ^= 0x06; - a.u8[rate-1] ^= 0x80; + a.u8[HASH_RATE(dst_len)-1] ^= 0x80; // permute permute(a.u64, SHA3_NUM_ROUNDS); @@ -573,10 +577,10 @@ static inline void hash_final(sha3_t * const hash, const size_t rate, uint8_t * } // define hash one-shot and iterative context functions -#define DEF_HASH(BITS) \ +#define DEF_HASH(BITS, OUT_LEN) \ /* one-shot hash */ \ - void sha3_ ## BITS(const uint8_t *m, size_t m_len, uint8_t dst[static SHA3_ ## BITS ## _LEN]) { \ - hash_once(m, m_len, dst, SHA3_ ## BITS ## _LEN); \ + void sha3_ ## BITS(const uint8_t *m, size_t m_len, uint8_t dst[static OUT_LEN]) { \ + hash_once(m, m_len, dst, OUT_LEN); \ } \ \ /* Initialize iterative hash context. */ \ @@ -586,33 +590,19 @@ static inline void hash_final(sha3_t * const hash, const size_t rate, uint8_t * \ /* Absorb data into SHA3 iterative hash context. */ \ _Bool sha3_ ## BITS ## _absorb(sha3_t * const hash, const uint8_t *src, const size_t len) { \ - return hash_absorb(hash, SHA3_ ## BITS ## _RATE, src, len); \ + return hash_absorb(hash, HASH_RATE(OUT_LEN), src, len); \ } \ \ /* Finalize SHA3 iterative hash context. */ \ - void sha3_ ## BITS ## _final(sha3_t * const hash, uint8_t dst[static SHA3_ ## BITS ## _LEN]) { \ - hash_final(hash, SHA3_ ## BITS ## _RATE, dst, SHA3_ ## BITS ## _LEN); \ + void sha3_ ## BITS ## _final(sha3_t * const hash, uint8_t dst[static OUT_LEN]) { \ + hash_final(hash, HASH_RATE(OUT_LEN), dst, OUT_LEN); \ } -// sha3-224 -#define SHA3_224_LEN 28 // sha3-224 output length, in bytes -#define SHA3_224_RATE 200 - 2 * SHA3_224_LEN // sha3-224 input rate -DEF_HASH(224) // sha3_224_{init,absorb,final}() - -// sha3-256 -#define SHA3_256_LEN 32 // sha3-256 output length, in bytes -#define SHA3_256_RATE 200 - 2 * SHA3_256_LEN // sha3-256 input rate, in bytes -DEF_HASH(256) // sha3_256_{init,absorb,final}() - -// sha3-384 -#define SHA3_384_LEN 48 // sha3-384 output length, in bytes -#define SHA3_384_RATE 200 - 2 * SHA3_384_LEN // sha3-384 input rate, in bytes -DEF_HASH(384) // sha3_384_{init,absorb,final}() - -// sha3-512 -#define SHA3_512_LEN 64 // sha3-512 output length, in bytes -#define SHA3_512_RATE 200 - 2 * SHA3_512_LEN // sha3-512 input rate, in bytes -DEF_HASH(512) // sha3_512_{init,absorb,final}() +// define hashes +DEF_HASH(224, 28) // sha3-224 +DEF_HASH(256, 32) // sha3-256 +DEF_HASH(384, 48) // sha3-384 +DEF_HASH(512, 64) // sha3-512 // initialize xof context static inline void xof_init(sha3_xof_t * const xof) { @@ -735,33 +725,32 @@ static inline void xof_once(const size_t rate, const size_t num_rounds, const ui \ /* squeeze bytes from shake context */ \ void shake ## BITS ## _squeeze(sha3_xof_t * const xof, uint8_t * const dst, const size_t dst_len) { \ - xof_squeeze(xof, SHAKE ## BITS ## _RATE, SHA3_NUM_ROUNDS, SHAKE ## BITS ## _PAD, dst, dst_len); \ + xof_squeeze(xof, SHAKE ## BITS ## _RATE, SHA3_NUM_ROUNDS, SHAKE_PAD, dst, dst_len); \ } \ \ /* one-shot shake absorb and squeeze */ \ void shake ## BITS(const uint8_t * const src, const size_t src_len, uint8_t * const dst, const size_t dst_len) { \ - xof_once(SHAKE ## BITS ## _RATE, SHA3_NUM_ROUNDS, SHAKE ## BITS ## _PAD, src, src_len, dst, dst_len); \ + xof_once(SHAKE ## BITS ## _RATE, SHA3_NUM_ROUNDS, SHAKE_PAD, src, src_len, dst, dst_len); \ } -// shake128 +// shake padding byte and rates +#define SHAKE_PAD 0x1f #define SHAKE128_RATE (200 - 2 * 16) // shake128 input rate, in bytes -#define SHAKE128_PAD 0x1f // shake128 padding -DEF_SHAKE(128) // shake128_{init,absorb,squeeze}() - -// shake256 #define SHAKE256_RATE (200 - 2 * 32) // shake256 input rate, in bytes -#define SHAKE256_PAD 0x1f // shake256 padding + +// define shake xofs +DEF_SHAKE(128) // shake128_{init,absorb,squeeze}() DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() // define hmac-sha3 iterative context and one-shot functions -#define DEF_HMAC(BITS) \ +#define DEF_HMAC(BITS, OUT_LEN) \ /* init hmac-sha3 context */ \ void hmac_sha3_ ## BITS ## _init(hmac_sha3_t *hmac, const uint8_t *k, const size_t k_len) { \ /* clear finalized flag */ \ hmac->finalized = false; \ \ /* init key buffer */ \ - uint8_t k_buf[SHA3_ ## BITS ## _RATE] = { 0 }; \ + uint8_t k_buf[HASH_RATE(OUT_LEN)] = { 0 }; \ if (k_len <= sizeof(k_buf)) { \ memcpy(k_buf, k, k_len); \ } else { \ @@ -769,7 +758,7 @@ DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() } \ \ /* apply opad */ \ - for (size_t i = 0; i < SHA3_ ## BITS ## _RATE; i++) { \ + for (size_t i = 0; i < HASH_RATE(OUT_LEN); i++) { \ k_buf[i] ^= 0x5c; \ } \ \ @@ -778,7 +767,7 @@ DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() sha3_ ## BITS ## _absorb(&(hmac->outer), k_buf, sizeof(k_buf)); \ \ /* remove opad, apply ipad */ \ - for (size_t i = 0; i < SHA3_ ## BITS ## _RATE; i++) { \ + for (size_t i = 0; i < HASH_RATE(OUT_LEN); i++) { \ k_buf[i] ^= (0x5c ^ 0x36); \ } \ \ @@ -793,9 +782,9 @@ DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() } \ \ /* finalize hmac-sha3 context */ \ - void hmac_sha3_ ## BITS ## _final(hmac_sha3_t *hmac, uint8_t dst[static SHA3_ ## BITS ## _LEN]) { \ + void hmac_sha3_ ## BITS ## _final(hmac_sha3_t *hmac, uint8_t dst[static OUT_LEN]) { \ /* finalize inner hash into buffer */ \ - uint8_t buf[SHA3_ ## BITS ## _LEN] = { 0 }; \ + uint8_t buf[OUT_LEN] = { 0 }; \ sha3_ ## BITS ## _final(&(hmac->inner), buf); \ \ /* absorb into outer hash */ \ @@ -806,7 +795,7 @@ DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() } \ \ /* one-shot hmac-sha3 */ \ - void hmac_sha3_ ## BITS(const uint8_t * const k, const size_t k_len, const uint8_t * const m, const size_t m_len, uint8_t dst[static SHA3_## BITS ##_LEN]) { \ + void hmac_sha3_ ## BITS(const uint8_t * const k, const size_t k_len, const uint8_t * const m, const size_t m_len, uint8_t dst[static OUT_LEN]) { \ /* init */ \ hmac_sha3_t hmac; \ hmac_sha3_## BITS ##_init(&hmac, k, k_len); \ @@ -819,10 +808,10 @@ DEF_SHAKE(256) // shake256_{init,absorb,squeeze}() } // define hmacs -DEF_HMAC(224) // hmac-sha3-224 -DEF_HMAC(256) // hmac-sha3-224 -DEF_HMAC(384) // hmac-sha3-224 -DEF_HMAC(512) // hmac-sha3-224 +DEF_HMAC(224, 28) // hmac-sha3-224 +DEF_HMAC(256, 32) // hmac-sha3-224 +DEF_HMAC(384, 48) // hmac-sha3-224 +DEF_HMAC(512, 64) // hmac-sha3-224 // NIST SP 800-105 utility function. static inline size_t left_encode(uint8_t buf[static 9], const uint64_t n) { @@ -1048,19 +1037,19 @@ static inline bytepad_t bytepad(const size_t data_len, const size_t width) { return r; } -#define CSHAKE128_XOF_RATE (200 - 2 * 16) -#define CSHAKE128_XOF_PAD 0x04 +// cshake padding byte +#define CSHAKE_PAD 0x04 _Bool cshake128_xof_absorb(sha3_xof_t * const xof, const uint8_t * const msg, const size_t len) { - return xof_absorb(xof, CSHAKE128_XOF_RATE, SHA3_NUM_ROUNDS, msg, len); + return xof_absorb(xof, SHAKE128_RATE, SHA3_NUM_ROUNDS, msg, len); } void cshake128_xof_squeeze(sha3_xof_t * const xof, uint8_t * const dst, const size_t len) { - xof_squeeze(xof, CSHAKE128_XOF_RATE, SHA3_NUM_ROUNDS, CSHAKE128_XOF_PAD, dst, len); + xof_squeeze(xof, SHAKE128_RATE, SHA3_NUM_ROUNDS, CSHAKE_PAD, dst, len); } void cshake128_xof_init(sha3_xof_t * const xof, const cshake_params_t params) { - static const uint8_t PAD[CSHAKE128_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE128_RATE] = { 0 }; if (!params.name_len && !params.custom_len) { // cshake w/o nist prefix and domain is shake @@ -1082,7 +1071,7 @@ void cshake128_xof_init(sha3_xof_t * const xof, const cshake_params_t params) { const size_t raw_len = name_len + params.name_len + custom_len + params.custom_len; // build bytepad prefix - const bytepad_t bp = bytepad(raw_len, CSHAKE128_XOF_RATE); + const bytepad_t bp = bytepad(raw_len, SHAKE128_RATE); // init xof xof_init(xof); @@ -1131,19 +1120,16 @@ void cshake128( cshake128_xof_squeeze(&xof, dst, dst_len); } -#define CSHAKE256_XOF_RATE (200 - 2 * 32) -#define CSHAKE256_XOF_PAD 0x04 - _Bool cshake256_xof_absorb(sha3_xof_t * const xof, const uint8_t * const msg, const size_t len) { - return xof_absorb(xof, CSHAKE256_XOF_RATE, SHA3_NUM_ROUNDS, msg, len); + return xof_absorb(xof, SHAKE256_RATE, SHA3_NUM_ROUNDS, msg, len); } void cshake256_xof_squeeze(sha3_xof_t * const xof, uint8_t * const dst, const size_t len) { - xof_squeeze(xof, CSHAKE256_XOF_RATE, SHA3_NUM_ROUNDS, CSHAKE256_XOF_PAD, dst, len); + xof_squeeze(xof, SHAKE256_RATE, SHA3_NUM_ROUNDS, CSHAKE_PAD, dst, len); } void cshake256_xof_init(sha3_xof_t * const xof, const cshake_params_t params) { - static const uint8_t PAD[CSHAKE256_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE256_RATE] = { 0 }; if (!params.name_len && !params.custom_len) { // cshake w/o nist prefix and domain is shake @@ -1165,7 +1151,7 @@ void cshake256_xof_init(sha3_xof_t * const xof, const cshake_params_t params) { const size_t raw_len = name_len + params.name_len + custom_len + params.custom_len; // build bytepad prefix - const bytepad_t bp = bytepad(raw_len, CSHAKE256_XOF_RATE); + const bytepad_t bp = bytepad(raw_len, SHAKE256_RATE); // init xof xof_init(xof); @@ -1219,7 +1205,7 @@ void kmac128( const uint8_t * const msg, const size_t msg_len, uint8_t * const dst, const size_t dst_len ) { - static const uint8_t PAD[CSHAKE128_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE128_RATE] = { 0 }; static const uint8_t NAME[4] = { 'K', 'M', 'A', 'C' }; // build cshake128 params @@ -1235,7 +1221,7 @@ void kmac128( const size_t key_buf_len = encode_string_prefix(key_buf, params.key_len); // build bytepad prefix - const bytepad_t bp = bytepad(key_buf_len + params.key_len, CSHAKE128_XOF_RATE); + const bytepad_t bp = bytepad(key_buf_len + params.key_len, SHAKE128_RATE); // init xof sha3_xof_t xof; @@ -1275,7 +1261,7 @@ void kmac256( const uint8_t * const msg, const size_t msg_len, uint8_t * const dst, const size_t dst_len ) { - static const uint8_t PAD[CSHAKE256_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE256_RATE] = { 0 }; static const uint8_t NAME[4] = { 'K', 'M', 'A', 'C' }; // build cshake256 params @@ -1291,7 +1277,7 @@ void kmac256( const size_t key_buf_len = encode_string_prefix(key_buf, params.key_len); // build bytepad prefix - const bytepad_t bp = bytepad(key_buf_len + params.key_len, CSHAKE256_XOF_RATE); + const bytepad_t bp = bytepad(key_buf_len + params.key_len, SHAKE256_RATE); // init xof sha3_xof_t xof; @@ -1340,7 +1326,7 @@ void kmac128_xof_squeeze(sha3_xof_t * const xof, uint8_t * const dst, const size } void kmac128_xof_init(sha3_xof_t * const xof, const kmac_params_t params) { - static const uint8_t PAD[CSHAKE128_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE128_RATE] = { 0 }; static const uint8_t NAME[4] = { 'K', 'M', 'A', 'C' }; // build cshake128 params @@ -1356,7 +1342,7 @@ void kmac128_xof_init(sha3_xof_t * const xof, const kmac_params_t params) { const size_t key_buf_len = encode_string_prefix(key_buf, params.key_len); // build bytepad prefix - const bytepad_t bp = bytepad(key_buf_len + params.key_len, CSHAKE128_XOF_RATE); + const bytepad_t bp = bytepad(key_buf_len + params.key_len, SHAKE128_RATE); // init xof cshake128_xof_init(xof, cshake_params); @@ -1398,7 +1384,7 @@ void kmac256_xof_squeeze(sha3_xof_t * const xof, uint8_t * const dst, const size } void kmac256_xof_init(sha3_xof_t * const xof, const kmac_params_t params) { - static const uint8_t PAD[CSHAKE256_XOF_RATE] = { 0 }; + static const uint8_t PAD[SHAKE256_RATE] = { 0 }; static const uint8_t NAME[4] = { 'K', 'M', 'A', 'C' }; // build cshake256 params @@ -1414,7 +1400,7 @@ void kmac256_xof_init(sha3_xof_t * const xof, const kmac_params_t params) { const size_t key_buf_len = encode_string_prefix(key_buf, params.key_len); // build bytepad prefix - const bytepad_t bp = bytepad(key_buf_len + params.key_len, CSHAKE256_XOF_RATE); + const bytepad_t bp = bytepad(key_buf_len + params.key_len, SHAKE256_RATE); // init xof cshake256_xof_init(xof, cshake_params); |