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Feature: Added SHA3 support
This commit is contained in:
Philipp Schafft
parent
bbddb556ef
commit
9560620c02
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@ -100,6 +100,8 @@ AC_CHECK_HEADERS([sys/timeb.h])
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AC_CHECK_HEADERS([sys/socket.h])
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AC_CHECK_HEADERS([pwd.h grp.h])
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AC_C_BIGENDIAN
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XIPH_NET
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dnl Check for functions
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293
src/digest.c
293
src/digest.c
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@ -4,6 +4,9 @@
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* A copy of this license is included with this source.
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*
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* Copyright 2020, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
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*
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* The SHA3 implementation is based on rhash:
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* 2013 by Aleksey Kravchenko <rhash.admin@gmail.com>
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*/
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#ifdef HAVE_CONFIG_H
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@ -29,11 +32,276 @@ struct digest_tag {
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int done;
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union {
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struct MD5Context md5;
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struct {
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/* 1600 bits algorithm hashing state */
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uint64_t hash[25];
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/* 1536-bit buffer for leftovers */
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uint64_t message[24];
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/* count of bytes in the message[] buffer */
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size_t rest;
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/* size of a message block processed at once */
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size_t block_size;
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} sha3;
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} state;
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};
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REFOBJECT_DEFINE_TYPE(digest_t);
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#define ROTL64(qword, n) ((qword) << (n) ^ ((qword) >> (64 - (n))))
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#ifdef WORDS_BIGENDIAN
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// TODO: Improve this.
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static inline uint64_t digest_letoh64(uint64_t x)
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{
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union {
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uint64_t num;
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char b[8];
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} in, out;
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int i;
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in.num = x;
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for (i = 0; i < 8; i++)
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out.b[i] = in.b[7 - i];
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return out.num;
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}
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#else
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#define digest_letoh64(x) (x)
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#endif
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/* SHA3 (Keccak) constants for 24 rounds */
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static uint64_t keccak_round_constants[] = {
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0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808AULL, 0x8000000080008000ULL,
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0x000000000000808BULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL,
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0x000000000000008AULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000AULL,
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0x000000008000808BULL, 0x800000000000008BULL, 0x8000000000008089ULL, 0x8000000000008003ULL,
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0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800AULL, 0x800000008000000AULL,
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0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
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};
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static inline void sha3_init(digest_t *digest, unsigned int bits)
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{
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/* The Keccak capacity parameter = bits * 2 */
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unsigned int rate = 1600 - bits * 2;
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digest->state.sha3.block_size = rate / 8;
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}
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#define XORED_A(i) A[(i)] ^ A[(i) + 5] ^ A[(i) + 10] ^ A[(i) + 15] ^ A[(i) + 20]
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#define THETA_STEP(i) \
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A[(i)] ^= D[(i)]; \
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A[(i) + 5] ^= D[(i)]; \
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A[(i) + 10] ^= D[(i)]; \
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A[(i) + 15] ^= D[(i)]; \
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A[(i) + 20] ^= D[(i)]
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/* Keccak theta() transformation */
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static inline void keccak_theta(uint64_t *A)
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{
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uint64_t D[5];
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D[0] = ROTL64(XORED_A(1), 1) ^ XORED_A(4);
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D[1] = ROTL64(XORED_A(2), 1) ^ XORED_A(0);
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D[2] = ROTL64(XORED_A(3), 1) ^ XORED_A(1);
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D[3] = ROTL64(XORED_A(4), 1) ^ XORED_A(2);
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D[4] = ROTL64(XORED_A(0), 1) ^ XORED_A(3);
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THETA_STEP(0);
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THETA_STEP(1);
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THETA_STEP(2);
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THETA_STEP(3);
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THETA_STEP(4);
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}
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/* Keccak pi() transformation */
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static inline void keccak_pi(uint64_t *A)
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{
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uint64_t A1;
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A1 = A[1];
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A[ 1] = A[ 6];
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A[ 6] = A[ 9];
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A[ 9] = A[22];
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A[22] = A[14];
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A[14] = A[20];
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A[20] = A[ 2];
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A[ 2] = A[12];
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A[12] = A[13];
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A[13] = A[19];
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A[19] = A[23];
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A[23] = A[15];
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A[15] = A[ 4];
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A[ 4] = A[24];
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A[24] = A[21];
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A[21] = A[ 8];
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A[ 8] = A[16];
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A[16] = A[ 5];
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A[ 5] = A[ 3];
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A[ 3] = A[18];
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A[18] = A[17];
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A[17] = A[11];
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A[11] = A[ 7];
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A[ 7] = A[10];
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A[10] = A1;
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/* note: A[ 0] is left as is */
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}
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#define CHI_STEP(i) \
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A0 = A[0 + (i)]; \
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A1 = A[1 + (i)]; \
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A[0 + (i)] ^= ~A1 & A[2 + (i)]; \
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A[1 + (i)] ^= ~A[2 + (i)] & A[3 + (i)]; \
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A[2 + (i)] ^= ~A[3 + (i)] & A[4 + (i)]; \
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A[3 + (i)] ^= ~A[4 + (i)] & A0; \
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A[4 + (i)] ^= ~A0 & A1
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/* Keccak chi() transformation */
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static inline void keccak_chi(uint64_t *A)
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{
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uint64_t A0, A1;
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CHI_STEP(0);
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CHI_STEP(5);
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CHI_STEP(10);
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CHI_STEP(15);
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CHI_STEP(20);
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}
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/**
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* The core transformation. Process the specified block of data.
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*
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* @param hash the algorithm state
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* @param block the message block to process
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* @param block_size the size of the processed block in bytes
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*/
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static inline void sha3_process_block(uint64_t hash[25], const uint64_t *block, size_t block_size)
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{
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size_t round;
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/* expanded loop */
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hash[ 0] ^= digest_letoh64(block[ 0]);
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hash[ 1] ^= digest_letoh64(block[ 1]);
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hash[ 2] ^= digest_letoh64(block[ 2]);
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hash[ 3] ^= digest_letoh64(block[ 3]);
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hash[ 4] ^= digest_letoh64(block[ 4]);
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hash[ 5] ^= digest_letoh64(block[ 5]);
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hash[ 6] ^= digest_letoh64(block[ 6]);
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hash[ 7] ^= digest_letoh64(block[ 7]);
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hash[ 8] ^= digest_letoh64(block[ 8]);
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/* if not sha3-512 */
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if (block_size > 72) {
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hash[ 9] ^= digest_letoh64(block[ 9]);
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hash[10] ^= digest_letoh64(block[10]);
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hash[11] ^= digest_letoh64(block[11]);
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hash[12] ^= digest_letoh64(block[12]);
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/* if not sha3-384 */
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if (block_size > 104) {
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hash[13] ^= digest_letoh64(block[13]);
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hash[14] ^= digest_letoh64(block[14]);
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hash[15] ^= digest_letoh64(block[15]);
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hash[16] ^= digest_letoh64(block[16]);
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/* if not sha3-256 */
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if (block_size > 136) {
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hash[17] ^= digest_letoh64(block[17]);
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}
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}
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}
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/* make a permutation of the hash */
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for (round = 0; round < (sizeof(keccak_round_constants)/sizeof(*keccak_round_constants)); round++) {
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keccak_theta(hash);
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/* apply Keccak rho() transformation */
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hash[ 1] = ROTL64(hash[ 1], 1);
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hash[ 2] = ROTL64(hash[ 2], 62);
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hash[ 3] = ROTL64(hash[ 3], 28);
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hash[ 4] = ROTL64(hash[ 4], 27);
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hash[ 5] = ROTL64(hash[ 5], 36);
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hash[ 6] = ROTL64(hash[ 6], 44);
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hash[ 7] = ROTL64(hash[ 7], 6);
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hash[ 8] = ROTL64(hash[ 8], 55);
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hash[ 9] = ROTL64(hash[ 9], 20);
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hash[10] = ROTL64(hash[10], 3);
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hash[11] = ROTL64(hash[11], 10);
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hash[12] = ROTL64(hash[12], 43);
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hash[13] = ROTL64(hash[13], 25);
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hash[14] = ROTL64(hash[14], 39);
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hash[15] = ROTL64(hash[15], 41);
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hash[16] = ROTL64(hash[16], 45);
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hash[17] = ROTL64(hash[17], 15);
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hash[18] = ROTL64(hash[18], 21);
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hash[19] = ROTL64(hash[19], 8);
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hash[20] = ROTL64(hash[20], 18);
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hash[21] = ROTL64(hash[21], 2);
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hash[22] = ROTL64(hash[22], 61);
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hash[23] = ROTL64(hash[23], 56);
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hash[24] = ROTL64(hash[24], 14);
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keccak_pi(hash);
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keccak_chi(hash);
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/* apply iota(hash, round) */
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*hash ^= keccak_round_constants[round];
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}
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}
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void sha3_write(digest_t *digest, const unsigned char *msg, size_t size)
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{
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size_t index = digest->state.sha3.rest;
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size_t block_size = digest->state.sha3.block_size;
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digest->state.sha3.rest = (index + size) % block_size;
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/* fill partial block */
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if (index) {
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size_t left = block_size - index;
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memcpy(digest->state.sha3.message + index, msg, (size < left ? size : left));
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if (size < left) return;
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/* process partial block */
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sha3_process_block(digest->state.sha3.hash, digest->state.sha3.message, block_size);
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msg += left;
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size -= left;
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}
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while (size >= block_size) {
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uint64_t *aligned_message_block;
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if (((intptr_t)(void*)msg) & 7) {
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memcpy(digest->state.sha3.message, msg, block_size);
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aligned_message_block = digest->state.sha3.message;
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} else {
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aligned_message_block = (uint64_t*)msg;
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}
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sha3_process_block(digest->state.sha3.hash, aligned_message_block, block_size);
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msg += block_size;
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size -= block_size;
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}
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if (size)
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memcpy(digest->state.sha3.message, msg, size); /* save leftovers */
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}
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static inline size_t sha3_read(digest_t *digest, void *buf, size_t len)
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{
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const size_t block_size = digest->state.sha3.block_size;
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memset(digest->state.sha3.message + digest->state.sha3.rest, 0, block_size - digest->state.sha3.rest);
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((char*)digest->state.sha3.message)[digest->state.sha3.rest] |= 0x06;
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((char*)digest->state.sha3.message)[block_size - 1] |= 0x80;
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sha3_process_block(digest->state.sha3.hash, digest->state.sha3.message, block_size);
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#ifdef WORDS_BIGENDIAN
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do {
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size_t i;
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for (i = 0; i < (sizeof(digest->state.sha3.hash)/sizeof(*digest->state.sha3.hash)); i++)
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digest->state.sha3.hash[i] = digest_htole64(digest->state.sha3.hash[i]);
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} while (0);
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#endif
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if (len > (100 - digest->state.sha3.block_size / 2))
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len = 100 - digest->state.sha3.block_size / 2;
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memcpy(buf, digest->state.sha3.hash, len);
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return len;
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}
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digest_t * digest_new(digest_algo_t algo)
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{
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digest_t *digest = refobject_new__new(digest_t, NULL, NULL, NULL);
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@ -46,6 +314,18 @@ digest_t * digest_new(digest_algo_t algo)
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case DIGEST_ALGO_MD5:
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MD5Init(&(digest->state.md5));
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break;
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case DIGEST_ALGO_SHA3_224:
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sha3_init(digest, 224);
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break;
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case DIGEST_ALGO_SHA3_256:
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sha3_init(digest, 256);
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break;
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case DIGEST_ALGO_SHA3_384:
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sha3_init(digest, 384);
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break;
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case DIGEST_ALGO_SHA3_512:
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sha3_init(digest, 512);
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break;
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default:
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refobject_unref(digest);
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return NULL;
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@ -68,6 +348,13 @@ ssize_t digest_write(digest_t *digest, const void *data, size_t len)
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MD5Update(&(digest->state.md5), (const unsigned char *)data, len);
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return len;
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break;
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case DIGEST_ALGO_SHA3_224:
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case DIGEST_ALGO_SHA3_256:
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case DIGEST_ALGO_SHA3_384:
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case DIGEST_ALGO_SHA3_512:
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sha3_write(digest, data, len);
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return len;
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break;
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default:
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return -1;
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break;
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@ -96,6 +383,12 @@ ssize_t digest_read(digest_t *digest, void *buf, size_t len)
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return HASH_LEN;
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}
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break;
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case DIGEST_ALGO_SHA3_224:
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case DIGEST_ALGO_SHA3_256:
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case DIGEST_ALGO_SHA3_384:
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case DIGEST_ALGO_SHA3_512:
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return sha3_read(digest, buf, len);
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break;
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default:
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return -1;
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break;
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@ -14,7 +14,11 @@
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REFOBJECT_FORWARD_TYPE(digest_t);
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typedef enum {
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DIGEST_ALGO_MD5
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DIGEST_ALGO_MD5,
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DIGEST_ALGO_SHA3_224,
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DIGEST_ALGO_SHA3_256,
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DIGEST_ALGO_SHA3_384,
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DIGEST_ALGO_SHA3_512
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} digest_algo_t;
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digest_t * digest_new(digest_algo_t algo);
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