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/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>
  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 <linux/init.h>
  21#include <linux/module.h>
  22#include <linux/mm.h>
  23#include <linux/crypto.h>
  24#include <linux/types.h>
  25#include <crypto/sha.h>
  26#include <asm/byteorder.h>
  27
  28struct sha256_ctx {
  29        u32 count[2];
  30        u32 state[8];
  31        u8 buf[128];
  32};
  33
  34static inline u32 Ch(u32 x, u32 y, u32 z)
  35{
  36        return z ^ (x & (y ^ z));
  37}
  38
  39static 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
  49static inline void LOAD_OP(int I, u32 *W, const u8 *input)
  50{
  51        W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
  52}
  53
  54static 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
  59static 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
 222
 223static 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
 238static void sha256_init(struct crypto_tfm *tfm)
 239{
 240        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
 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;
 249        sctx->count[0] = sctx->count[1] = 0;
 250}
 251
 252static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
 253                          unsigned int len)
 254{
 255        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
 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
 285static void sha256_final(struct crypto_tfm *tfm, u8 *out)
 286{
 287        struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
 288        __be32 *dst = (__be32 *)out;
 289        __be32 bits[2];
 290        unsigned int index, pad_len;
 291        int i;
 292        static const u8 padding[64] = { 0x80, };
 293
 294        /* Save number of bits */
 295        bits[1] = cpu_to_be32(sctx->count[0]);
 296        bits[0] = cpu_to_be32(sctx->count[1]);
 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);
 301        sha256_update(tfm, padding, pad_len);
 302
 303        /* Append length (before padding) */
 304        sha256_update(tfm, (const u8 *)bits, sizeof(bits));
 305
 306        /* Store state in digest */
 307        for (i = 0; i < 8; i++)
 308                dst[i] = cpu_to_be32(sctx->state[i]);
 309
 310        /* Zeroize sensitive information. */
 311        memset(sctx, 0, sizeof(*sctx));
 312}
 313
 314static void sha224_final(struct crypto_tfm *tfm, u8 *hash)
 315{
 316        u8 D[SHA256_DIGEST_SIZE];
 317
 318        sha256_final(tfm, D);
 319
 320        memcpy(hash, D, SHA224_DIGEST_SIZE);
 321        memset(D, 0, SHA256_DIGEST_SIZE);
 322}
 323
 324static struct crypto_alg sha256 = {
 325        .cra_name       =       "sha256",
 326        .cra_driver_name=       "sha256-generic",
 327        .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
 328        .cra_blocksize  =       SHA256_BLOCK_SIZE,
 329        .cra_ctxsize    =       sizeof(struct sha256_ctx),
 330        .cra_module     =       THIS_MODULE,
 331        .cra_alignmask  =       3,
 332        .cra_list       =       LIST_HEAD_INIT(sha256.cra_list),
 333        .cra_u          =       { .digest = {
 334        .dia_digestsize =       SHA256_DIGEST_SIZE,
 335        .dia_init       =       sha256_init,
 336        .dia_update     =       sha256_update,
 337        .dia_final      =       sha256_final } }
 338};
 339
 340static 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 } }
 354};
 355
 356static int __init sha256_generic_mod_init(void)
 357{
 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;
 371}
 372
 373static void __exit sha256_generic_mod_fini(void)
 374{
 375        crypto_unregister_alg(&sha224);
 376        crypto_unregister_alg(&sha256);
 377}
 378
 379module_init(sha256_generic_mod_init);
 380module_exit(sha256_generic_mod_fini);
 381
 382MODULE_LICENSE("GPL");
 383MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 384
 385MODULE_ALIAS("sha224");
 386MODULE_ALIAS("sha256");
 387
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