linux/crypto/sha512.c
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   1/* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
   2 *
   3 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   4 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   5 * Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License as published by the
   9 * Free Software Foundation; either version 2, or (at your option) any
  10 * later version.
  11 *
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16
  17#include <linux/mm.h>
  18#include <linux/init.h>
  19#include <linux/crypto.h>
  20#include <linux/types.h>
  21
  22#include <asm/scatterlist.h>
  23#include <asm/byteorder.h>
  24
  25#define SHA384_DIGEST_SIZE 48
  26#define SHA512_DIGEST_SIZE 64
  27#define SHA384_HMAC_BLOCK_SIZE  96
  28#define SHA512_HMAC_BLOCK_SIZE 128
  29
  30struct sha512_ctx {
  31        u64 state[8];
  32        u32 count[4];
  33        u8 buf[128];
  34        u64 W[80];
  35};
  36
  37static inline u64 Ch(u64 x, u64 y, u64 z)
  38{
  39        return z ^ (x & (y ^ z));
  40}
  41
  42static inline u64 Maj(u64 x, u64 y, u64 z)
  43{
  44        return (x & y) | (z & (x | y));
  45}
  46
  47static inline u64 RORu64(u64 x, u64 y)
  48{
  49        return (x >> y) | (x << (64 - y));
  50}
  51
  52static const u64 sha512_K[80] = {
  53        0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  54        0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  55        0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  56        0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  57        0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  58        0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  59        0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  60        0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  61        0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  62        0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  63        0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  64        0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  65        0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  66        0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  67        0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  68        0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  69        0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  70        0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  71        0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  72        0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  73        0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  74        0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  75        0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  76        0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  77        0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  78        0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  79        0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  80};
  81
  82#define e0(x)       (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
  83#define e1(x)       (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
  84#define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
  85#define s1(x)       (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
  86
  87/* H* initial state for SHA-512 */
  88#define H0         0x6a09e667f3bcc908ULL
  89#define H1         0xbb67ae8584caa73bULL
  90#define H2         0x3c6ef372fe94f82bULL
  91#define H3         0xa54ff53a5f1d36f1ULL
  92#define H4         0x510e527fade682d1ULL
  93#define H5         0x9b05688c2b3e6c1fULL
  94#define H6         0x1f83d9abfb41bd6bULL
  95#define H7         0x5be0cd19137e2179ULL
  96
  97/* H'* initial state for SHA-384 */
  98#define HP0 0xcbbb9d5dc1059ed8ULL
  99#define HP1 0x629a292a367cd507ULL
 100#define HP2 0x9159015a3070dd17ULL
 101#define HP3 0x152fecd8f70e5939ULL
 102#define HP4 0x67332667ffc00b31ULL
 103#define HP5 0x8eb44a8768581511ULL
 104#define HP6 0xdb0c2e0d64f98fa7ULL
 105#define HP7 0x47b5481dbefa4fa4ULL
 106
 107static inline void LOAD_OP(int I, u64 *W, const u8 *input)
 108{
 109        W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
 110}
 111
 112static inline void BLEND_OP(int I, u64 *W)
 113{
 114        W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 115}
 116
 117static void
 118sha512_transform(u64 *state, u64 *W, const u8 *input)
 119{
 120        u64 a, b, c, d, e, f, g, h, t1, t2;
 121
 122        int i;
 123
 124        /* load the input */
 125        for (i = 0; i < 16; i++)
 126                LOAD_OP(i, W, input);
 127
 128        for (i = 16; i < 80; i++) {
 129                BLEND_OP(i, W);
 130        }
 131
 132        /* load the state into our registers */
 133        a=state[0];   b=state[1];   c=state[2];   d=state[3];  
 134        e=state[4];   f=state[5];   g=state[6];   h=state[7];  
 135  
 136        /* now iterate */
 137        for (i=0; i<80; i+=8) {
 138                t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[i  ];
 139                t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 140                t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
 141                t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 142                t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
 143                t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 144                t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
 145                t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 146                t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
 147                t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 148                t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
 149                t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 150                t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
 151                t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 152                t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
 153                t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 154        }
 155  
 156        state[0] += a; state[1] += b; state[2] += c; state[3] += d;  
 157        state[4] += e; state[5] += f; state[6] += g; state[7] += h;  
 158
 159        /* erase our data */
 160        a = b = c = d = e = f = g = h = t1 = t2 = 0;
 161}
 162
 163static void
 164sha512_init(struct crypto_tfm *tfm)
 165{
 166        struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 167        sctx->state[0] = H0;
 168        sctx->state[1] = H1;
 169        sctx->state[2] = H2;
 170        sctx->state[3] = H3;
 171        sctx->state[4] = H4;
 172        sctx->state[5] = H5;
 173        sctx->state[6] = H6;
 174        sctx->state[7] = H7;
 175        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 176}
 177
 178static void
 179sha384_init(struct crypto_tfm *tfm)
 180{
 181        struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 182        sctx->state[0] = HP0;
 183        sctx->state[1] = HP1;
 184        sctx->state[2] = HP2;
 185        sctx->state[3] = HP3;
 186        sctx->state[4] = HP4;
 187        sctx->state[5] = HP5;
 188        sctx->state[6] = HP6;
 189        sctx->state[7] = HP7;
 190        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 191}
 192
 193static void
 194sha512_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 195{
 196        struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 197
 198        unsigned int i, index, part_len;
 199
 200        /* Compute number of bytes mod 128 */
 201        index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
 202        
 203        /* Update number of bits */
 204        if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 205                if ((sctx->count[1] += 1) < 1)
 206                        if ((sctx->count[2] += 1) < 1)
 207                                sctx->count[3]++;
 208                sctx->count[1] += (len >> 29);
 209        }
 210        
 211        part_len = 128 - index;
 212        
 213        /* Transform as many times as possible. */
 214        if (len >= part_len) {
 215                memcpy(&sctx->buf[index], data, part_len);
 216                sha512_transform(sctx->state, sctx->W, sctx->buf);
 217
 218                for (i = part_len; i + 127 < len; i+=128)
 219                        sha512_transform(sctx->state, sctx->W, &data[i]);
 220
 221                index = 0;
 222        } else {
 223                i = 0;
 224        }
 225
 226        /* Buffer remaining input */
 227        memcpy(&sctx->buf[index], &data[i], len - i);
 228
 229        /* erase our data */
 230        memset(sctx->W, 0, sizeof(sctx->W));
 231}
 232
 233static void
 234sha512_final(struct crypto_tfm *tfm, u8 *hash)
 235{
 236        struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 237        static u8 padding[128] = { 0x80, };
 238        __be64 *dst = (__be64 *)hash;
 239        __be32 bits[4];
 240        unsigned int index, pad_len;
 241        int i;
 242
 243        /* Save number of bits */
 244        bits[3] = cpu_to_be32(sctx->count[0]);
 245        bits[2] = cpu_to_be32(sctx->count[1]);
 246        bits[1] = cpu_to_be32(sctx->count[2]);
 247        bits[0] = cpu_to_be32(sctx->count[3]);
 248
 249        /* Pad out to 112 mod 128. */
 250        index = (sctx->count[0] >> 3) & 0x7f;
 251        pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 252        sha512_update(tfm, padding, pad_len);
 253
 254        /* Append length (before padding) */
 255        sha512_update(tfm, (const u8 *)bits, sizeof(bits));
 256
 257        /* Store state in digest */
 258        for (i = 0; i < 8; i++)
 259                dst[i] = cpu_to_be64(sctx->state[i]);
 260
 261        /* Zeroize sensitive information. */
 262        memset(sctx, 0, sizeof(struct sha512_ctx));
 263}
 264
 265static void sha384_final(struct crypto_tfm *tfm, u8 *hash)
 266{
 267        u8 D[64];
 268
 269        sha512_final(tfm, D);
 270
 271        memcpy(hash, D, 48);
 272        memset(D, 0, 64);
 273}
 274
 275static struct crypto_alg sha512 = {
 276        .cra_name       = "sha512",
 277        .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 278        .cra_blocksize  = SHA512_HMAC_BLOCK_SIZE,
 279        .cra_ctxsize    = sizeof(struct sha512_ctx),
 280        .cra_module     = THIS_MODULE,
 281        .cra_alignmask  = 3,
 282        .cra_list       = LIST_HEAD_INIT(sha512.cra_list),
 283        .cra_u          = { .digest = {
 284                                .dia_digestsize = SHA512_DIGEST_SIZE,
 285                                .dia_init       = sha512_init,
 286                                .dia_update     = sha512_update,
 287                                .dia_final      = sha512_final }
 288        }
 289};
 290
 291static struct crypto_alg sha384 = {
 292        .cra_name       = "sha384",
 293        .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 294        .cra_blocksize  = SHA384_HMAC_BLOCK_SIZE,
 295        .cra_ctxsize    = sizeof(struct sha512_ctx),
 296        .cra_alignmask  = 3,
 297        .cra_module     = THIS_MODULE,
 298        .cra_list       = LIST_HEAD_INIT(sha384.cra_list),
 299        .cra_u          = { .digest = {
 300                                .dia_digestsize = SHA384_DIGEST_SIZE,
 301                                .dia_init       = sha384_init,
 302                                .dia_update     = sha512_update,
 303                                .dia_final      = sha384_final }
 304        }
 305};
 306
 307MODULE_ALIAS("sha384");
 308
 309static int __init init(void)
 310{
 311        int ret = 0;
 312
 313        if ((ret = crypto_register_alg(&sha384)) < 0)
 314                goto out;
 315        if ((ret = crypto_register_alg(&sha512)) < 0)
 316                crypto_unregister_alg(&sha384);
 317out:
 318        return ret;
 319}
 320
 321static void __exit fini(void)
 322{
 323        crypto_unregister_alg(&sha384);
 324        crypto_unregister_alg(&sha512);
 325}
 326
 327module_init(init);
 328module_exit(fini);
 329
 330MODULE_LICENSE("GPL");
 331MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
 332
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