linux/crypto/sha256_generic.c
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   1/*
   2 * Cryptographic API.
   3 *
   4 * SHA-256, as specified in
   5 * http://csrc.nist.gov/groups/STM/cavp/documents/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>
  12 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
  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 <crypto/internal/hash.h>
  21#include <linux/init.h>
  22#include <linux/module.h>
  23#include <linux/mm.h>
  24#include <linux/types.h>
  25#include <crypto/sha.h>
  26#include <crypto/sha256_base.h>
  27#include <asm/byteorder.h>
  28#include <asm/unaligned.h>
  29
  30const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
  31        0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
  32        0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
  33        0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
  34        0x2f
  35};
  36EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
  37
  38const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
  39        0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
  40        0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
  41        0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
  42        0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
  43};
  44EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
  45
  46static inline u32 Ch(u32 x, u32 y, u32 z)
  47{
  48        return z ^ (x & (y ^ z));
  49}
  50
  51static inline u32 Maj(u32 x, u32 y, u32 z)
  52{
  53        return (x & y) | (z & (x | y));
  54}
  55
  56#define e0(x)       (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
  57#define e1(x)       (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
  58#define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
  59#define s1(x)       (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
  60
  61static inline void LOAD_OP(int I, u32 *W, const u8 *input)
  62{
  63        W[I] = get_unaligned_be32((__u32 *)input + I);
  64}
  65
  66static inline void BLEND_OP(int I, u32 *W)
  67{
  68        W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
  69}
  70
  71static void sha256_transform(u32 *state, const u8 *input)
  72{
  73        u32 a, b, c, d, e, f, g, h, t1, t2;
  74        u32 W[64];
  75        int i;
  76
  77        /* load the input */
  78        for (i = 0; i < 16; i++)
  79                LOAD_OP(i, W, input);
  80
  81        /* now blend */
  82        for (i = 16; i < 64; i++)
  83                BLEND_OP(i, W);
  84
  85        /* load the state into our registers */
  86        a=state[0];  b=state[1];  c=state[2];  d=state[3];
  87        e=state[4];  f=state[5];  g=state[6];  h=state[7];
  88
  89        /* now iterate */
  90        t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
  91        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
  92        t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
  93        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
  94        t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
  95        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
  96        t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
  97        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
  98        t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
  99        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 100        t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
 101        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 102        t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
 103        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 104        t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
 105        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 106
 107        t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
 108        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 109        t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
 110        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 111        t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
 112        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 113        t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
 114        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 115        t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
 116        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 117        t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
 118        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 119        t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
 120        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 121        t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
 122        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 123
 124        t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
 125        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 126        t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
 127        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 128        t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
 129        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 130        t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
 131        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 132        t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
 133        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 134        t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
 135        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 136        t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
 137        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 138        t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
 139        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 140
 141        t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
 142        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 143        t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
 144        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 145        t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
 146        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 147        t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
 148        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 149        t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
 150        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 151        t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
 152        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 153        t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
 154        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 155        t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
 156        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 157
 158        t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
 159        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 160        t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
 161        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 162        t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
 163        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 164        t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
 165        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 166        t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
 167        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 168        t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
 169        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 170        t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
 171        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 172        t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
 173        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 174
 175        t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
 176        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 177        t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
 178        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 179        t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
 180        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 181        t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
 182        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 183        t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
 184        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 185        t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
 186        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 187        t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
 188        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 189        t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
 190        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 191
 192        t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
 193        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 194        t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
 195        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 196        t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
 197        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 198        t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
 199        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 200        t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
 201        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 202        t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
 203        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 204        t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
 205        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 206        t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
 207        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 208
 209        t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
 210        t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 211        t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
 212        t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 213        t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
 214        t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 215        t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
 216        t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 217        t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
 218        t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 219        t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
 220        t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 221        t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
 222        t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 223        t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
 224        t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 225
 226        state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 227        state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 228
 229        /* clear any sensitive info... */
 230        a = b = c = d = e = f = g = h = t1 = t2 = 0;
 231        memzero_explicit(W, 64 * sizeof(u32));
 232}
 233
 234static void sha256_generic_block_fn(struct sha256_state *sst, u8 const *src,
 235                                    int blocks)
 236{
 237        while (blocks--) {
 238                sha256_transform(sst->state, src);
 239                src += SHA256_BLOCK_SIZE;
 240        }
 241}
 242
 243int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
 244                          unsigned int len)
 245{
 246        return sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
 247}
 248EXPORT_SYMBOL(crypto_sha256_update);
 249
 250static int sha256_final(struct shash_desc *desc, u8 *out)
 251{
 252        sha256_base_do_finalize(desc, sha256_generic_block_fn);
 253        return sha256_base_finish(desc, out);
 254}
 255
 256int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
 257                        unsigned int len, u8 *hash)
 258{
 259        sha256_base_do_update(desc, data, len, sha256_generic_block_fn);
 260        return sha256_final(desc, hash);
 261}
 262EXPORT_SYMBOL(crypto_sha256_finup);
 263
 264static struct shash_alg sha256_algs[2] = { {
 265        .digestsize     =       SHA256_DIGEST_SIZE,
 266        .init           =       sha256_base_init,
 267        .update         =       crypto_sha256_update,
 268        .final          =       sha256_final,
 269        .finup          =       crypto_sha256_finup,
 270        .descsize       =       sizeof(struct sha256_state),
 271        .base           =       {
 272                .cra_name       =       "sha256",
 273                .cra_driver_name=       "sha256-generic",
 274                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 275                .cra_blocksize  =       SHA256_BLOCK_SIZE,
 276                .cra_module     =       THIS_MODULE,
 277        }
 278}, {
 279        .digestsize     =       SHA224_DIGEST_SIZE,
 280        .init           =       sha224_base_init,
 281        .update         =       crypto_sha256_update,
 282        .final          =       sha256_final,
 283        .finup          =       crypto_sha256_finup,
 284        .descsize       =       sizeof(struct sha256_state),
 285        .base           =       {
 286                .cra_name       =       "sha224",
 287                .cra_driver_name=       "sha224-generic",
 288                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 289                .cra_blocksize  =       SHA224_BLOCK_SIZE,
 290                .cra_module     =       THIS_MODULE,
 291        }
 292} };
 293
 294static int __init sha256_generic_mod_init(void)
 295{
 296        return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 297}
 298
 299static void __exit sha256_generic_mod_fini(void)
 300{
 301        crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 302}
 303
 304module_init(sha256_generic_mod_init);
 305module_exit(sha256_generic_mod_fini);
 306
 307MODULE_LICENSE("GPL");
 308MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 309
 310MODULE_ALIAS_CRYPTO("sha224");
 311MODULE_ALIAS_CRYPTO("sha224-generic");
 312MODULE_ALIAS_CRYPTO("sha256");
 313MODULE_ALIAS_CRYPTO("sha256-generic");
 314