350 lines
11 KiB
C
350 lines
11 KiB
C
/*
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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/cryptval/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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*
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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/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/crypto.h>
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#include <asm/scatterlist.h>
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#include <asm/byteorder.h>
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#define SHA256_DIGEST_SIZE 32
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#define SHA256_HMAC_BLOCK_SIZE 64
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struct sha256_ctx {
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u32 count[2];
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u32 state[8];
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u8 buf[128];
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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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#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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#define H0 0x6a09e667
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#define H1 0xbb67ae85
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#define H2 0x3c6ef372
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#define H3 0xa54ff53a
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#define H4 0x510e527f
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#define H5 0x9b05688c
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#define H6 0x1f83d9ab
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#define H7 0x5be0cd19
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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] = __be32_to_cpu( ((__be32*)(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]; 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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/* 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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); d+=t1; 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); c+=t1; 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); b+=t1; 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); a+=t1; 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); h+=t1; 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); g+=t1; 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); f+=t1; 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); e+=t1; 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;
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t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
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t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
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t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
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t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
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t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
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t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
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t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
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t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
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t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
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t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
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t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
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t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
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t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
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t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
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t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
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t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
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t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
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t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
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t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
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t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
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t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
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t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
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t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
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t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
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t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
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t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
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t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
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t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
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t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
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t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
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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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/* clear any sensitive info... */
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a = b = c = d = e = f = g = h = t1 = t2 = 0;
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memset(W, 0, 64 * sizeof(u32));
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}
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static void sha256_init(void *ctx)
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{
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struct sha256_ctx *sctx = ctx;
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sctx->state[0] = H0;
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sctx->state[1] = H1;
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sctx->state[2] = H2;
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sctx->state[3] = H3;
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sctx->state[4] = H4;
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sctx->state[5] = H5;
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sctx->state[6] = H6;
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sctx->state[7] = H7;
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sctx->count[0] = sctx->count[1] = 0;
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memset(sctx->buf, 0, sizeof(sctx->buf));
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}
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static void sha256_update(void *ctx, const u8 *data, unsigned int len)
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{
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struct sha256_ctx *sctx = ctx;
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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 = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
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/* Update number of bits */
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if ((sctx->count[0] += (len << 3)) < (len << 3)) {
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sctx->count[1]++;
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sctx->count[1] += (len >> 29);
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}
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part_len = 64 - 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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sha256_transform(sctx->state, sctx->buf);
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for (i = part_len; i + 63 < len; i += 64)
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sha256_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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}
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static void sha256_final(void* ctx, u8 *out)
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{
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struct sha256_ctx *sctx = ctx;
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u8 bits[8];
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unsigned int index, pad_len, t;
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int i, j;
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static const u8 padding[64] = { 0x80, };
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/* Save number of bits */
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t = sctx->count[0];
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bits[7] = t; t >>= 8;
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bits[6] = t; t >>= 8;
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bits[5] = t; t >>= 8;
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bits[4] = t;
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t = sctx->count[1];
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bits[3] = t; t >>= 8;
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bits[2] = t; t >>= 8;
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bits[1] = t; t >>= 8;
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bits[0] = t;
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/* Pad out to 56 mod 64. */
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index = (sctx->count[0] >> 3) & 0x3f;
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pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
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sha256_update(sctx, padding, pad_len);
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/* Append length (before padding) */
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sha256_update(sctx, bits, 8);
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/* Store state in digest */
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for (i = j = 0; i < 8; i++, j += 4) {
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t = sctx->state[i];
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out[j+3] = t; t >>= 8;
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out[j+2] = t; t >>= 8;
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out[j+1] = t; t >>= 8;
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out[j ] = t;
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}
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/* Zeroize sensitive information. */
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memset(sctx, 0, sizeof(*sctx));
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}
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static struct crypto_alg alg = {
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.cra_name = "sha256",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
|
.cra_blocksize = SHA256_HMAC_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct sha256_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(alg.cra_list),
|
|
.cra_u = { .digest = {
|
|
.dia_digestsize = SHA256_DIGEST_SIZE,
|
|
.dia_init = sha256_init,
|
|
.dia_update = sha256_update,
|
|
.dia_final = sha256_final } }
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return crypto_register_alg(&alg);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg);
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
|