547 lines
13 KiB
C
547 lines
13 KiB
C
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/*
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* Cryptographic API.
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*
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* SHA-256, as specified in
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* http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
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*
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* SHA-256 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) 2002 James Morris <jmorris@intercode.com.au>
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* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
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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 Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include "sha256.h"
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#define SHA256_H0 0x6a09e667UL
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#define SHA256_H1 0xbb67ae85UL
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#define SHA256_H2 0x3c6ef372UL
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#define SHA256_H3 0xa54ff53aUL
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#define SHA256_H4 0x510e527fUL
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#define SHA256_H5 0x9b05688cUL
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#define SHA256_H6 0x1f83d9abUL
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#define SHA256_H7 0x5be0cd19UL
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#define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
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#define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
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#define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
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#define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
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static const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
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0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
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0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
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0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
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0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
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};
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static inline u32 Ch(u32 x, u32 y, u32 z)
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{
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return z ^ (x & (y ^ z));
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}
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static inline u32 Maj(u32 x, u32 y, u32 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 void *shash_desc_ctx(struct shash_desc *desc)
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{
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return &desc->__ctx;
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}
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static inline void LOAD_OP(int I, u32 *W, const u8 *input)
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{
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W[I] = get_unaligned_be32((__u32 *) input + I);
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}
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static inline void BLEND_OP(int I, u32 *W)
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{
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W[I] = s1(W[I - 2]) + W[I - 7] + s0(W[I - 15]) + W[I - 16];
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}
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static void sha256_transform(u32 *state, const u8 *input)
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{
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u32 a, b, c, d, e, f, g, h, t1, t2;
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u32 W[64];
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int i;
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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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/* now blend */
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for (i = 16; i < 64; i++)
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BLEND_OP(i, W);
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/* load the state into our registers */
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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f = state[5];
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g = state[6];
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h = state[7];
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/* now iterate */
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t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
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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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t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
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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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t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[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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t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
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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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t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
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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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t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
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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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t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
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t2 = e0(h) + Maj(h, a, b);
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c += t1;
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g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
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t2 = e0(g) + Maj(g, h, a);
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b += t1;
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f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
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t2 = e0(f) + Maj(f, g, h);
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a += t1;
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e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
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t2 = e0(e) + Maj(e, f, g);
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h += t1;
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d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
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t2 = e0(d) + Maj(d, e, f);
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g += t1;
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c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
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t2 = e0(c) + Maj(c, d, e);
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f += t1;
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b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
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t2 = e0(b) + Maj(b, c, d);
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e += t1;
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a = t1 + t2;
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t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
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||
|
|
t2 = e0(a) + Maj(a, b, c);
|
||
|
|
d += t1;
|
||
|
|
h = t1 + t2;
|
||
|
|
t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
|
||
|
|
t2 = e0(h) + Maj(h, a, b);
|
||
|
|
c += t1;
|
||
|
|
g = t1 + t2;
|
||
|
|
t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
|
||
|
|
t2 = e0(g) + Maj(g, h, a);
|
||
|
|
b += t1;
|
||
|
|
f = t1 + t2;
|
||
|
|
t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
|
||
|
|
t2 = e0(f) + Maj(f, g, h);
|
||
|
|
a += t1;
|
||
|
|
e = t1 + t2;
|
||
|
|
t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
|
||
|
|
t2 = e0(e) + Maj(e, f, g);
|
||
|
|
h += t1;
|
||
|
|
d = t1 + t2;
|
||
|
|
t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
|
||
|
|
t2 = e0(d) + Maj(d, e, f);
|
||
|
|
g += t1;
|
||
|
|
c = t1 + t2;
|
||
|
|
t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
|
||
|
|
t2 = e0(c) + Maj(c, d, e);
|
||
|
|
f += t1;
|
||
|
|
b = t1 + t2;
|
||
|
|
t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
|
||
|
|
t2 = e0(b) + Maj(b, c, d);
|
||
|
|
e += t1;
|
||
|
|
a = t1 + t2;
|
||
|
|
|
||
|
|
t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
|
||
|
|
t2 = e0(a) + Maj(a, b, c);
|
||
|
|
d += t1;
|
||
|
|
h = t1 + t2;
|
||
|
|
t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
|
||
|
|
t2 = e0(h) + Maj(h, a, b);
|
||
|
|
c += t1;
|
||
|
|
g = t1 + t2;
|
||
|
|
t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
|
||
|
|
t2 = e0(g) + Maj(g, h, a);
|
||
|
|
b += t1;
|
||
|
|
f = t1 + t2;
|
||
|
|
t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
|
||
|
|
t2 = e0(f) + Maj(f, g, h);
|
||
|
|
a += t1;
|
||
|
|
e = t1 + t2;
|
||
|
|
t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
|
||
|
|
t2 = e0(e) + Maj(e, f, g);
|
||
|
|
h += t1;
|
||
|
|
d = t1 + t2;
|
||
|
|
t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
|
||
|
|
t2 = e0(d) + Maj(d, e, f);
|
||
|
|
g += t1;
|
||
|
|
c = t1 + t2;
|
||
|
|
t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
|
||
|
|
t2 = e0(c) + Maj(c, d, e);
|
||
|
|
f += t1;
|
||
|
|
b = t1 + t2;
|
||
|
|
t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
|
||
|
|
t2 = e0(b) + Maj(b, c, d);
|
||
|
|
e += t1;
|
||
|
|
a = t1 + t2;
|
||
|
|
|
||
|
|
state[0] += a;
|
||
|
|
state[1] += b;
|
||
|
|
state[2] += c;
|
||
|
|
state[3] += d;
|
||
|
|
state[4] += e;
|
||
|
|
state[5] += f;
|
||
|
|
state[6] += g;
|
||
|
|
state[7] += h;
|
||
|
|
|
||
|
|
/* clear any sensitive info... */
|
||
|
|
a = b = c = d = e = f = g = h = t1 = t2 = 0;
|
||
|
|
memzero_explicit(W, 64 * sizeof(u32));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void sha256_generic_block_fn(struct sha256_state *sst, u8 const *src,
|
||
|
|
int blocks)
|
||
|
|
{
|
||
|
|
while (blocks--) {
|
||
|
|
sha256_transform(sst->state, src);
|
||
|
|
src += SHA256_BLOCK_SIZE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sha256_base_do_update(struct shash_desc *desc,
|
||
|
|
const u8 *data,
|
||
|
|
unsigned int len, sha256_block_fn *block_fn)
|
||
|
|
{
|
||
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
||
|
|
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
sctx->count += len;
|
||
|
|
|
||
|
|
if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
|
||
|
|
int blocks;
|
||
|
|
|
||
|
|
if (partial) {
|
||
|
|
int p = SHA256_BLOCK_SIZE - partial;
|
||
|
|
|
||
|
|
memcpy(sctx->buf + partial, data, p);
|
||
|
|
data += p;
|
||
|
|
len -= p;
|
||
|
|
|
||
|
|
block_fn(sctx, sctx->buf, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
blocks = len / SHA256_BLOCK_SIZE;
|
||
|
|
len %= SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
if (blocks) {
|
||
|
|
block_fn(sctx, data, blocks);
|
||
|
|
data += blocks * SHA256_BLOCK_SIZE;
|
||
|
|
}
|
||
|
|
partial = 0;
|
||
|
|
}
|
||
|
|
if (len)
|
||
|
|
memcpy(sctx->buf + partial, data, len);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int sha256_base_do_finalize(struct shash_desc *desc,
|
||
|
|
sha256_block_fn *block_fn)
|
||
|
|
{
|
||
|
|
const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
|
||
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
||
|
|
__be64 *bits = (__be64 *) (sctx->buf + bit_offset);
|
||
|
|
unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
|
||
|
|
|
||
|
|
sctx->buf[partial++] = 0x80;
|
||
|
|
if (partial > bit_offset) {
|
||
|
|
memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
|
||
|
|
partial = 0;
|
||
|
|
|
||
|
|
block_fn(sctx, sctx->buf, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(sctx->buf + partial, 0x0, bit_offset - partial);
|
||
|
|
*bits = cpu_to_be64(sctx->count << 3);
|
||
|
|
block_fn(sctx, sctx->buf, 1);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
|
||
|
|
{
|
||
|
|
unsigned int digest_size = SHA256_DIGEST_SIZE;
|
||
|
|
struct sha256_state *sctx = shash_desc_ctx(desc);
|
||
|
|
__be32 *digest = (__be32 *) out;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
|
||
|
|
put_unaligned_be32(sctx->state[i], digest++);
|
||
|
|
|
||
|
|
*sctx = (struct sha256_state) {
|
||
|
|
};
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_init(struct shash_desc *desc)
|
||
|
|
{
|
||
|
|
struct sha256_state *sctx = NULL;
|
||
|
|
|
||
|
|
if (!desc)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
sctx = shash_desc_ctx(desc);
|
||
|
|
|
||
|
|
sctx->state[0] = SHA256_H0;
|
||
|
|
sctx->state[1] = SHA256_H1;
|
||
|
|
sctx->state[2] = SHA256_H2;
|
||
|
|
sctx->state[3] = SHA256_H3;
|
||
|
|
sctx->state[4] = SHA256_H4;
|
||
|
|
sctx->state[5] = SHA256_H5;
|
||
|
|
sctx->state[6] = SHA256_H6;
|
||
|
|
sctx->state[7] = SHA256_H7;
|
||
|
|
sctx->count = 0;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_update(struct shash_desc *desc, const u8 *data, unsigned int len)
|
||
|
|
{
|
||
|
|
if (!desc || !data)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_final(struct shash_desc *desc, u8 *out)
|
||
|
|
{
|
||
|
|
if (!desc || !out)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
sha256_base_do_finalize(desc, sha256_generic_block_fn);
|
||
|
|
return sha256_base_finish(desc, out);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_finup(struct shash_desc *desc, const u8 *data,
|
||
|
|
unsigned int len, u8 *hash)
|
||
|
|
{
|
||
|
|
if (!desc || !data || !hash)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
|
||
|
|
return sha256_final(desc, hash);
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256_desc_copy(struct shash_desc *dst, const struct shash_desc *src)
|
||
|
|
{
|
||
|
|
if (!dst || !src)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
memcpy(dst, src, sizeof(struct shash_desc));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sha256(const u8 *data, unsigned int len, u8 *out)
|
||
|
|
{
|
||
|
|
struct shash_desc ctx;
|
||
|
|
int ret = -EINVAL;
|
||
|
|
|
||
|
|
if (!out || !data)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
ret = sha256_init(&ctx);
|
||
|
|
if (ret != 0)
|
||
|
|
goto exit_error;
|
||
|
|
|
||
|
|
ret = sha256_update(&ctx, data, len);
|
||
|
|
if (ret != 0)
|
||
|
|
goto exit_error;
|
||
|
|
|
||
|
|
ret = sha256_final(&ctx, out);
|
||
|
|
if (ret != 0)
|
||
|
|
goto exit_error;
|
||
|
|
|
||
|
|
memzero_explicit(&ctx, sizeof(ctx));
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
exit_error:
|
||
|
|
return ret;
|
||
|
|
}
|