Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
| 4 | * SHA-256, as specified in |
| 5 | * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf |
| 6 | * |
| 7 | * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. |
| 8 | * |
| 9 | * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> |
| 10 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> |
| 11 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 12 | * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify it |
| 15 | * under the terms of the GNU General Public License as published by the Free |
| 16 | * Software Foundation; either version 2 of the License, or (at your option) |
| 17 | * any later version. |
| 18 | * |
| 19 | */ |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/crypto.h> |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 24 | #include <linux/types.h> |
Jan Glauber | 5265eeb | 2007-10-09 22:43:13 +0800 | [diff] [blame] | 25 | #include <crypto/sha.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/byteorder.h> |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | struct sha256_ctx { |
| 29 | u32 count[2]; |
| 30 | u32 state[8]; |
| 31 | u8 buf[128]; |
| 32 | }; |
| 33 | |
| 34 | static inline u32 Ch(u32 x, u32 y, u32 z) |
| 35 | { |
| 36 | return z ^ (x & (y ^ z)); |
| 37 | } |
| 38 | |
| 39 | static inline u32 Maj(u32 x, u32 y, u32 z) |
| 40 | { |
| 41 | return (x & y) | (z & (x | y)); |
| 42 | } |
| 43 | |
| 44 | #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) |
| 45 | #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) |
| 46 | #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) |
| 47 | #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | static inline void LOAD_OP(int I, u32 *W, const u8 *input) |
| 50 | { |
| 51 | W[I] = __be32_to_cpu( ((__be32*)(input))[I] ); |
| 52 | } |
| 53 | |
| 54 | static inline void BLEND_OP(int I, u32 *W) |
| 55 | { |
| 56 | W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; |
| 57 | } |
| 58 | |
| 59 | static void sha256_transform(u32 *state, const u8 *input) |
| 60 | { |
| 61 | u32 a, b, c, d, e, f, g, h, t1, t2; |
| 62 | u32 W[64]; |
| 63 | int i; |
| 64 | |
| 65 | /* load the input */ |
| 66 | for (i = 0; i < 16; i++) |
| 67 | LOAD_OP(i, W, input); |
| 68 | |
| 69 | /* now blend */ |
| 70 | for (i = 16; i < 64; i++) |
| 71 | BLEND_OP(i, W); |
| 72 | |
| 73 | /* load the state into our registers */ |
| 74 | a=state[0]; b=state[1]; c=state[2]; d=state[3]; |
| 75 | e=state[4]; f=state[5]; g=state[6]; h=state[7]; |
| 76 | |
| 77 | /* now iterate */ |
| 78 | t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; |
| 79 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 80 | t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; |
| 81 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 82 | t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; |
| 83 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 84 | t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; |
| 85 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 86 | t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; |
| 87 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 88 | t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; |
| 89 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 90 | t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; |
| 91 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 92 | t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; |
| 93 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 94 | |
| 95 | t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; |
| 96 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 97 | t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; |
| 98 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 99 | t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; |
| 100 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 101 | t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; |
| 102 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 103 | t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; |
| 104 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 105 | t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; |
| 106 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 107 | t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; |
| 108 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 109 | t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; |
| 110 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 111 | |
| 112 | t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; |
| 113 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 114 | t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; |
| 115 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 116 | t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; |
| 117 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 118 | t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; |
| 119 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 120 | t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; |
| 121 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 122 | t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; |
| 123 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 124 | t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; |
| 125 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 126 | t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; |
| 127 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 128 | |
| 129 | t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; |
| 130 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 131 | t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; |
| 132 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 133 | t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; |
| 134 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 135 | t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; |
| 136 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 137 | t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; |
| 138 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 139 | t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; |
| 140 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 141 | t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; |
| 142 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 143 | t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; |
| 144 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 145 | |
| 146 | t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; |
| 147 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 148 | t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; |
| 149 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 150 | t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; |
| 151 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 152 | t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; |
| 153 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 154 | t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; |
| 155 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 156 | t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; |
| 157 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 158 | t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; |
| 159 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 160 | t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; |
| 161 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 162 | |
| 163 | t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; |
| 164 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 165 | t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; |
| 166 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 167 | t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; |
| 168 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 169 | t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; |
| 170 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 171 | t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; |
| 172 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 173 | t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; |
| 174 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 175 | t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; |
| 176 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 177 | t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; |
| 178 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 179 | |
| 180 | t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; |
| 181 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 182 | t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; |
| 183 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 184 | t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; |
| 185 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 186 | t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; |
| 187 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 188 | t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; |
| 189 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 190 | t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; |
| 191 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 192 | t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; |
| 193 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 194 | t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; |
| 195 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 196 | |
| 197 | t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; |
| 198 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; |
| 199 | t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; |
| 200 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; |
| 201 | t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; |
| 202 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; |
| 203 | t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; |
| 204 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; |
| 205 | t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; |
| 206 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; |
| 207 | t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; |
| 208 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; |
| 209 | t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; |
| 210 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; |
| 211 | t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; |
| 212 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; |
| 213 | |
| 214 | state[0] += a; state[1] += b; state[2] += c; state[3] += d; |
| 215 | state[4] += e; state[5] += f; state[6] += g; state[7] += h; |
| 216 | |
| 217 | /* clear any sensitive info... */ |
| 218 | a = b = c = d = e = f = g = h = t1 = t2 = 0; |
| 219 | memset(W, 0, 64 * sizeof(u32)); |
| 220 | } |
| 221 | |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 222 | |
| 223 | static void sha224_init(struct crypto_tfm *tfm) |
| 224 | { |
| 225 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
| 226 | sctx->state[0] = SHA224_H0; |
| 227 | sctx->state[1] = SHA224_H1; |
| 228 | sctx->state[2] = SHA224_H2; |
| 229 | sctx->state[3] = SHA224_H3; |
| 230 | sctx->state[4] = SHA224_H4; |
| 231 | sctx->state[5] = SHA224_H5; |
| 232 | sctx->state[6] = SHA224_H6; |
| 233 | sctx->state[7] = SHA224_H7; |
| 234 | sctx->count[0] = 0; |
| 235 | sctx->count[1] = 0; |
| 236 | } |
| 237 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 238 | static void sha256_init(struct crypto_tfm *tfm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 240 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
Jan Glauber | 5265eeb | 2007-10-09 22:43:13 +0800 | [diff] [blame] | 241 | sctx->state[0] = SHA256_H0; |
| 242 | sctx->state[1] = SHA256_H1; |
| 243 | sctx->state[2] = SHA256_H2; |
| 244 | sctx->state[3] = SHA256_H3; |
| 245 | sctx->state[4] = SHA256_H4; |
| 246 | sctx->state[5] = SHA256_H5; |
| 247 | sctx->state[6] = SHA256_H6; |
| 248 | sctx->state[7] = SHA256_H7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | sctx->count[0] = sctx->count[1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 252 | static void sha256_update(struct crypto_tfm *tfm, const u8 *data, |
| 253 | unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 255 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | unsigned int i, index, part_len; |
| 257 | |
| 258 | /* Compute number of bytes mod 128 */ |
| 259 | index = (unsigned int)((sctx->count[0] >> 3) & 0x3f); |
| 260 | |
| 261 | /* Update number of bits */ |
| 262 | if ((sctx->count[0] += (len << 3)) < (len << 3)) { |
| 263 | sctx->count[1]++; |
| 264 | sctx->count[1] += (len >> 29); |
| 265 | } |
| 266 | |
| 267 | part_len = 64 - index; |
| 268 | |
| 269 | /* Transform as many times as possible. */ |
| 270 | if (len >= part_len) { |
| 271 | memcpy(&sctx->buf[index], data, part_len); |
| 272 | sha256_transform(sctx->state, sctx->buf); |
| 273 | |
| 274 | for (i = part_len; i + 63 < len; i += 64) |
| 275 | sha256_transform(sctx->state, &data[i]); |
| 276 | index = 0; |
| 277 | } else { |
| 278 | i = 0; |
| 279 | } |
| 280 | |
| 281 | /* Buffer remaining input */ |
| 282 | memcpy(&sctx->buf[index], &data[i], len-i); |
| 283 | } |
| 284 | |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 285 | static void sha256_final(struct crypto_tfm *tfm, u8 *out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 287 | struct sha256_ctx *sctx = crypto_tfm_ctx(tfm); |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 288 | __be32 *dst = (__be32 *)out; |
| 289 | __be32 bits[2]; |
| 290 | unsigned int index, pad_len; |
| 291 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | static const u8 padding[64] = { 0x80, }; |
| 293 | |
| 294 | /* Save number of bits */ |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 295 | bits[1] = cpu_to_be32(sctx->count[0]); |
| 296 | bits[0] = cpu_to_be32(sctx->count[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
| 298 | /* Pad out to 56 mod 64. */ |
| 299 | index = (sctx->count[0] >> 3) & 0x3f; |
| 300 | pad_len = (index < 56) ? (56 - index) : ((64+56) - index); |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 301 | sha256_update(tfm, padding, pad_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | /* Append length (before padding) */ |
Herbert Xu | 6c2bb98 | 2006-05-16 22:09:29 +1000 | [diff] [blame] | 304 | sha256_update(tfm, (const u8 *)bits, sizeof(bits)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | /* Store state in digest */ |
Herbert Xu | 06ace7a | 2005-10-30 21:25:15 +1100 | [diff] [blame] | 307 | for (i = 0; i < 8; i++) |
| 308 | dst[i] = cpu_to_be32(sctx->state[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | /* Zeroize sensitive information. */ |
| 311 | memset(sctx, 0, sizeof(*sctx)); |
| 312 | } |
| 313 | |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 314 | static void sha224_final(struct crypto_tfm *tfm, u8 *hash) |
| 315 | { |
| 316 | u8 D[SHA256_DIGEST_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 318 | sha256_final(tfm, D); |
| 319 | |
| 320 | memcpy(hash, D, SHA224_DIGEST_SIZE); |
| 321 | memset(D, 0, SHA256_DIGEST_SIZE); |
| 322 | } |
| 323 | |
| 324 | static struct crypto_alg sha256 = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | .cra_name = "sha256", |
Michal Ludvig | b3be9a6 | 2006-07-09 08:59:38 +1000 | [diff] [blame] | 326 | .cra_driver_name= "sha256-generic", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
Jan Glauber | 5265eeb | 2007-10-09 22:43:13 +0800 | [diff] [blame] | 328 | .cra_blocksize = SHA256_BLOCK_SIZE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | .cra_ctxsize = sizeof(struct sha256_ctx), |
| 330 | .cra_module = THIS_MODULE, |
Atsushi Nemoto | e1147d8 | 2006-04-10 08:42:35 +1000 | [diff] [blame] | 331 | .cra_alignmask = 3, |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 332 | .cra_list = LIST_HEAD_INIT(sha256.cra_list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | .cra_u = { .digest = { |
| 334 | .dia_digestsize = SHA256_DIGEST_SIZE, |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 335 | .dia_init = sha256_init, |
| 336 | .dia_update = sha256_update, |
| 337 | .dia_final = sha256_final } } |
| 338 | }; |
| 339 | |
| 340 | static struct crypto_alg sha224 = { |
| 341 | .cra_name = "sha224", |
| 342 | .cra_driver_name = "sha224-generic", |
| 343 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
| 344 | .cra_blocksize = SHA224_BLOCK_SIZE, |
| 345 | .cra_ctxsize = sizeof(struct sha256_ctx), |
| 346 | .cra_module = THIS_MODULE, |
| 347 | .cra_alignmask = 3, |
| 348 | .cra_list = LIST_HEAD_INIT(sha224.cra_list), |
| 349 | .cra_u = { .digest = { |
| 350 | .dia_digestsize = SHA224_DIGEST_SIZE, |
| 351 | .dia_init = sha224_init, |
| 352 | .dia_update = sha256_update, |
| 353 | .dia_final = sha224_final } } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | }; |
| 355 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame^] | 356 | static int __init sha256_generic_mod_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | { |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 358 | int ret = 0; |
| 359 | |
| 360 | ret = crypto_register_alg(&sha224); |
| 361 | |
| 362 | if (ret < 0) |
| 363 | return ret; |
| 364 | |
| 365 | ret = crypto_register_alg(&sha256); |
| 366 | |
| 367 | if (ret < 0) |
| 368 | crypto_unregister_alg(&sha224); |
| 369 | |
| 370 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame^] | 373 | static void __exit sha256_generic_mod_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 375 | crypto_unregister_alg(&sha224); |
| 376 | crypto_unregister_alg(&sha256); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Kamalesh Babulal | 3af5b90 | 2008-04-05 21:00:57 +0800 | [diff] [blame^] | 379 | module_init(sha256_generic_mod_init); |
| 380 | module_exit(sha256_generic_mod_fini); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | MODULE_LICENSE("GPL"); |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 383 | MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm"); |
Michal Ludvig | b3be9a6 | 2006-07-09 08:59:38 +1000 | [diff] [blame] | 384 | |
Jonathan Lynch | cd12fb90 | 2007-11-10 20:08:25 +0800 | [diff] [blame] | 385 | MODULE_ALIAS("sha224"); |
Sebastian Siewior | ad5d278 | 2007-10-08 11:45:10 +0800 | [diff] [blame] | 386 | MODULE_ALIAS("sha256"); |