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51fc6dc8f9
For rounds 16--79, W[i] only depends on W[i - 2], W[i - 7], W[i - 15] and W[i - 16]. Consequently, keeping all W[80] array on stack is unnecessary, only 16 values are really needed. Using W[16] instead of W[80] greatly reduces stack usage (~750 bytes to ~340 bytes on x86_64). Line by line explanation: * BLEND_OP array is "circular" now, all indexes have to be modulo 16. Round number is positive, so remainder operation should be without surprises. * initial full message scheduling is trimmed to first 16 values which come from data block, the rest is calculated before it's needed. * original loop body is unrolled version of new SHA512_0_15 and SHA512_16_79 macros, unrolling was done to not do explicit variable renaming. Otherwise it's the very same code after preprocessing. See sha1_transform() code which does the same trick. Patch survives in-tree crypto test and original bugreport test (ping flood with hmac(sha512). See FIPS 180-2 for SHA-512 definition http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
308 lines
8.9 KiB
C
308 lines
8.9 KiB
C
/* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/crypto.h>
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#include <linux/types.h>
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#include <crypto/sha.h>
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#include <linux/percpu.h>
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#include <asm/byteorder.h>
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static inline u64 Ch(u64 x, u64 y, u64 z)
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{
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return z ^ (x & (y ^ z));
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}
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static inline u64 Maj(u64 x, u64 y, u64 z)
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{
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return (x & y) | (z & (x | y));
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}
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static inline u64 RORu64(u64 x, u64 y)
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{
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return (x >> y) | (x << (64 - y));
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}
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static const u64 sha512_K[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
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0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
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0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
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0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
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0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
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0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
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0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
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0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
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0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
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0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
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0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
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0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
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0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
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0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
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0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
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0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
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0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
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0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
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0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
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0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
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0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
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};
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#define e0(x) (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
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#define e1(x) (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
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#define s0(x) (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
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#define s1(x) (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
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static inline void LOAD_OP(int I, u64 *W, const u8 *input)
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{
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W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
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}
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static inline void BLEND_OP(int I, u64 *W)
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{
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W[I % 16] += s1(W[(I-2) % 16]) + W[(I-7) % 16] + s0(W[(I-15) % 16]);
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}
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static void
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sha512_transform(u64 *state, const u8 *input)
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{
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u64 a, b, c, d, e, f, g, h, t1, t2;
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int i;
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u64 W[16];
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/* load the input */
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for (i = 0; i < 16; i++)
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LOAD_OP(i, W, input);
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/* load the state into our registers */
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a=state[0]; b=state[1]; c=state[2]; d=state[3];
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e=state[4]; f=state[5]; g=state[6]; h=state[7];
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#define SHA512_0_15(i, a, b, c, d, e, f, g, h) \
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t1 = h + e1(e) + Ch(e, f, g) + sha512_K[i] + W[i]; \
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t2 = e0(a) + Maj(a, b, c); \
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d += t1; \
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h = t1 + t2
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#define SHA512_16_79(i, a, b, c, d, e, f, g, h) \
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BLEND_OP(i, W); \
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t1 = h + e1(e) + Ch(e, f, g) + sha512_K[i] + W[(i)%16]; \
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t2 = e0(a) + Maj(a, b, c); \
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d += t1; \
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h = t1 + t2
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for (i = 0; i < 16; i += 8) {
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SHA512_0_15(i, a, b, c, d, e, f, g, h);
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SHA512_0_15(i + 1, h, a, b, c, d, e, f, g);
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SHA512_0_15(i + 2, g, h, a, b, c, d, e, f);
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SHA512_0_15(i + 3, f, g, h, a, b, c, d, e);
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SHA512_0_15(i + 4, e, f, g, h, a, b, c, d);
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SHA512_0_15(i + 5, d, e, f, g, h, a, b, c);
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SHA512_0_15(i + 6, c, d, e, f, g, h, a, b);
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SHA512_0_15(i + 7, b, c, d, e, f, g, h, a);
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}
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for (i = 16; i < 80; i += 8) {
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SHA512_16_79(i, a, b, c, d, e, f, g, h);
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SHA512_16_79(i + 1, h, a, b, c, d, e, f, g);
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SHA512_16_79(i + 2, g, h, a, b, c, d, e, f);
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SHA512_16_79(i + 3, f, g, h, a, b, c, d, e);
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SHA512_16_79(i + 4, e, f, g, h, a, b, c, d);
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SHA512_16_79(i + 5, d, e, f, g, h, a, b, c);
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SHA512_16_79(i + 6, c, d, e, f, g, h, a, b);
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SHA512_16_79(i + 7, b, c, d, e, f, g, h, a);
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}
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state[0] += a; state[1] += b; state[2] += c; state[3] += d;
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state[4] += e; state[5] += f; state[6] += g; state[7] += h;
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/* erase our data */
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a = b = c = d = e = f = g = h = t1 = t2 = 0;
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}
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static int
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sha512_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA512_H0;
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sctx->state[1] = SHA512_H1;
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sctx->state[2] = SHA512_H2;
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sctx->state[3] = SHA512_H3;
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sctx->state[4] = SHA512_H4;
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sctx->state[5] = SHA512_H5;
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sctx->state[6] = SHA512_H6;
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sctx->state[7] = SHA512_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static int
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sha384_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA384_H0;
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sctx->state[1] = SHA384_H1;
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sctx->state[2] = SHA384_H2;
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sctx->state[3] = SHA384_H3;
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sctx->state[4] = SHA384_H4;
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sctx->state[5] = SHA384_H5;
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sctx->state[6] = SHA384_H6;
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sctx->state[7] = SHA384_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static int
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sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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unsigned int i, index, part_len;
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/* Compute number of bytes mod 128 */
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index = sctx->count[0] & 0x7f;
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/* Update number of bytes */
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if (!(sctx->count[0] += len))
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sctx->count[1]++;
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part_len = 128 - index;
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/* Transform as many times as possible. */
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if (len >= part_len) {
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memcpy(&sctx->buf[index], data, part_len);
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sha512_transform(sctx->state, sctx->buf);
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for (i = part_len; i + 127 < len; i+=128)
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sha512_transform(sctx->state, &data[i]);
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index = 0;
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} else {
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i = 0;
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}
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/* Buffer remaining input */
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memcpy(&sctx->buf[index], &data[i], len - i);
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return 0;
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}
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static int
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sha512_final(struct shash_desc *desc, u8 *hash)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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static u8 padding[128] = { 0x80, };
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__be64 *dst = (__be64 *)hash;
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__be64 bits[2];
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unsigned int index, pad_len;
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int i;
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/* Save number of bits */
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bits[1] = cpu_to_be64(sctx->count[0] << 3);
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bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
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/* Pad out to 112 mod 128. */
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index = sctx->count[0] & 0x7f;
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pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
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sha512_update(desc, padding, pad_len);
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/* Append length (before padding) */
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sha512_update(desc, (const u8 *)bits, sizeof(bits));
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be64(sctx->state[i]);
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/* Zeroize sensitive information. */
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memset(sctx, 0, sizeof(struct sha512_state));
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return 0;
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}
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static int sha384_final(struct shash_desc *desc, u8 *hash)
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{
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u8 D[64];
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sha512_final(desc, D);
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memcpy(hash, D, 48);
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memset(D, 0, 64);
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return 0;
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}
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static struct shash_alg sha512 = {
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.digestsize = SHA512_DIGEST_SIZE,
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.init = sha512_init,
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.update = sha512_update,
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.final = sha512_final,
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.descsize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha512",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA512_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct shash_alg sha384 = {
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.digestsize = SHA384_DIGEST_SIZE,
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.init = sha384_init,
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.update = sha512_update,
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.final = sha384_final,
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.descsize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha384",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA384_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha512_generic_mod_init(void)
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{
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int ret = 0;
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if ((ret = crypto_register_shash(&sha384)) < 0)
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goto out;
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if ((ret = crypto_register_shash(&sha512)) < 0)
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crypto_unregister_shash(&sha384);
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out:
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return ret;
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}
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static void __exit sha512_generic_mod_fini(void)
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{
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crypto_unregister_shash(&sha384);
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crypto_unregister_shash(&sha512);
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}
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module_init(sha512_generic_mod_init);
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module_exit(sha512_generic_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
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MODULE_ALIAS("sha384");
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MODULE_ALIAS("sha512");
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