Mercurial > dropbear
view libtomcrypt/src/hashes/sha3.c @ 1787:ce3ce75a6e04
Fix null pointer dereference removing listeners
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Mon, 07 Dec 2020 20:03:24 +0800 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ /* based on https://github.com/brainhub/SHA3IUF (public domain) */ #include "tomcrypt.h" #ifdef LTC_SHA3 const struct ltc_hash_descriptor sha3_224_desc = { "sha3-224", /* name of hash */ 17, /* internal ID */ 28, /* Size of digest in octets */ 144, /* Input block size in octets */ { 2,16,840,1,101,3,4,2,7 }, /* ASN.1 OID */ 9, /* Length OID */ &sha3_224_init, &sha3_process, &sha3_done, &sha3_224_test, NULL }; const struct ltc_hash_descriptor sha3_256_desc = { "sha3-256", /* name of hash */ 18, /* internal ID */ 32, /* Size of digest in octets */ 136, /* Input block size in octets */ { 2,16,840,1,101,3,4,2,8 }, /* ASN.1 OID */ 9, /* Length OID */ &sha3_256_init, &sha3_process, &sha3_done, &sha3_256_test, NULL }; const struct ltc_hash_descriptor sha3_384_desc = { "sha3-384", /* name of hash */ 19, /* internal ID */ 48, /* Size of digest in octets */ 104, /* Input block size in octets */ { 2,16,840,1,101,3,4,2,9 }, /* ASN.1 OID */ 9, /* Length OID */ &sha3_384_init, &sha3_process, &sha3_done, &sha3_384_test, NULL }; const struct ltc_hash_descriptor sha3_512_desc = { "sha3-512", /* name of hash */ 20, /* internal ID */ 64, /* Size of digest in octets */ 72, /* Input block size in octets */ { 2,16,840,1,101,3,4,2,10 }, /* ASN.1 OID */ 9, /* Length OID */ &sha3_512_init, &sha3_process, &sha3_done, &sha3_512_test, NULL }; #define SHA3_KECCAK_SPONGE_WORDS 25 /* 1600 bits > 200 bytes > 25 x ulong64 */ #define SHA3_KECCAK_ROUNDS 24 static const ulong64 keccakf_rndc[24] = { CONST64(0x0000000000000001), CONST64(0x0000000000008082), CONST64(0x800000000000808a), CONST64(0x8000000080008000), CONST64(0x000000000000808b), CONST64(0x0000000080000001), CONST64(0x8000000080008081), CONST64(0x8000000000008009), CONST64(0x000000000000008a), CONST64(0x0000000000000088), CONST64(0x0000000080008009), CONST64(0x000000008000000a), CONST64(0x000000008000808b), CONST64(0x800000000000008b), CONST64(0x8000000000008089), CONST64(0x8000000000008003), CONST64(0x8000000000008002), CONST64(0x8000000000000080), CONST64(0x000000000000800a), CONST64(0x800000008000000a), CONST64(0x8000000080008081), CONST64(0x8000000000008080), CONST64(0x0000000080000001), CONST64(0x8000000080008008) }; static const unsigned keccakf_rotc[24] = { 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44 }; static const unsigned keccakf_piln[24] = { 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1 }; static void keccakf(ulong64 s[25]) { int i, j, round; ulong64 t, bc[5]; for(round = 0; round < SHA3_KECCAK_ROUNDS; round++) { /* Theta */ for(i = 0; i < 5; i++) bc[i] = s[i] ^ s[i + 5] ^ s[i + 10] ^ s[i + 15] ^ s[i + 20]; for(i = 0; i < 5; i++) { t = bc[(i + 4) % 5] ^ ROL64(bc[(i + 1) % 5], 1); for(j = 0; j < 25; j += 5) s[j + i] ^= t; } /* Rho Pi */ t = s[1]; for(i = 0; i < 24; i++) { j = keccakf_piln[i]; bc[0] = s[j]; s[j] = ROL64(t, keccakf_rotc[i]); t = bc[0]; } /* Chi */ for(j = 0; j < 25; j += 5) { for(i = 0; i < 5; i++) bc[i] = s[j + i]; for(i = 0; i < 5; i++) s[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5]; } /* Iota */ s[0] ^= keccakf_rndc[round]; } } /* Public Inteface */ int sha3_224_init(hash_state *md) { LTC_ARGCHK(md != NULL); XMEMSET(&md->sha3, 0, sizeof(md->sha3)); md->sha3.capacity_words = 2 * 224 / (8 * sizeof(ulong64)); return CRYPT_OK; } int sha3_256_init(hash_state *md) { LTC_ARGCHK(md != NULL); XMEMSET(&md->sha3, 0, sizeof(md->sha3)); md->sha3.capacity_words = 2 * 256 / (8 * sizeof(ulong64)); return CRYPT_OK; } int sha3_384_init(hash_state *md) { LTC_ARGCHK(md != NULL); XMEMSET(&md->sha3, 0, sizeof(md->sha3)); md->sha3.capacity_words = 2 * 384 / (8 * sizeof(ulong64)); return CRYPT_OK; } int sha3_512_init(hash_state *md) { LTC_ARGCHK(md != NULL); XMEMSET(&md->sha3, 0, sizeof(md->sha3)); md->sha3.capacity_words = 2 * 512 / (8 * sizeof(ulong64)); return CRYPT_OK; } int sha3_shake_init(hash_state *md, int num) { LTC_ARGCHK(md != NULL); if (num != 128 && num != 256) return CRYPT_INVALID_ARG; XMEMSET(&md->sha3, 0, sizeof(md->sha3)); md->sha3.capacity_words = (unsigned short)(2 * num / (8 * sizeof(ulong64))); return CRYPT_OK; } int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen) { /* 0...7 -- how much is needed to have a word */ unsigned old_tail = (8 - md->sha3.byte_index) & 7; unsigned long words; unsigned tail; unsigned long i; if (inlen == 0) return CRYPT_OK; /* nothing to do */ LTC_ARGCHK(md != NULL); LTC_ARGCHK(in != NULL); if(inlen < old_tail) { /* have no complete word or haven't started the word yet */ while (inlen--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8); return CRYPT_OK; } if(old_tail) { /* will have one word to process */ inlen -= old_tail; while (old_tail--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8); /* now ready to add saved to the sponge */ md->sha3.s[md->sha3.word_index] ^= md->sha3.saved; md->sha3.byte_index = 0; md->sha3.saved = 0; if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) { keccakf(md->sha3.s); md->sha3.word_index = 0; } } /* now work in full words directly from input */ words = inlen / sizeof(ulong64); tail = inlen - words * sizeof(ulong64); for(i = 0; i < words; i++, in += sizeof(ulong64)) { ulong64 t; LOAD64L(t, in); md->sha3.s[md->sha3.word_index] ^= t; if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) { keccakf(md->sha3.s); md->sha3.word_index = 0; } } /* finally, save the partial word */ while (tail--) { md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8); } return CRYPT_OK; } int sha3_done(hash_state *md, unsigned char *hash) { unsigned i; LTC_ARGCHK(md != NULL); LTC_ARGCHK(hash != NULL); md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x06) << (md->sha3.byte_index * 8))); md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000); keccakf(md->sha3.s); /* store sha3.s[] as little-endian bytes into sha3.sb */ for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) { STORE64L(md->sha3.s[i], md->sha3.sb + i * 8); } XMEMCPY(hash, md->sha3.sb, md->sha3.capacity_words * 4); return CRYPT_OK; } int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen) { /* IMPORTANT NOTE: sha3_shake_done can be called many times */ unsigned long idx; unsigned i; if (outlen == 0) return CRYPT_OK; /* nothing to do */ LTC_ARGCHK(md != NULL); LTC_ARGCHK(out != NULL); if (!md->sha3.xof_flag) { /* shake_xof operation must be done only once */ md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x1F) << (md->sha3.byte_index * 8))); md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000); keccakf(md->sha3.s); /* store sha3.s[] as little-endian bytes into sha3.sb */ for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) { STORE64L(md->sha3.s[i], md->sha3.sb + i * 8); } md->sha3.byte_index = 0; md->sha3.xof_flag = 1; } for (idx = 0; idx < outlen; idx++) { if(md->sha3.byte_index >= (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words) * 8) { keccakf(md->sha3.s); /* store sha3.s[] as little-endian bytes into sha3.sb */ for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) { STORE64L(md->sha3.s[i], md->sha3.sb + i * 8); } md->sha3.byte_index = 0; } out[idx] = md->sha3.sb[md->sha3.byte_index++]; } return CRYPT_OK; } int sha3_shake_memory(int num, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { hash_state md; int err; LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); if ((err = sha3_shake_init(&md, num)) != CRYPT_OK) return err; if ((err = sha3_shake_process(&md, in, inlen)) != CRYPT_OK) return err; if ((err = sha3_shake_done(&md, out, *outlen)) != CRYPT_OK) return err; return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */