linux/crypto/sha512_generic.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#include <crypto/internal/hash.h>
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/mm.h>
  17#include <linux/init.h>
  18#include <linux/crypto.h>
  19#include <linux/types.h>
  20#include <crypto/sha.h>
  21#include <linux/percpu.h>
  22#include <asm/byteorder.h>
  23
  24struct sha512_ctx {
  25        u64 state[8];
  26        u32 count[4];
  27        u8 buf[128];
  28};
  29
  30static DEFINE_PER_CPU(u64[80], msg_schedule);
  31
  32static inline u64 Ch(u64 x, u64 y, u64 z)
  33{
  34        return z ^ (x & (y ^ z));
  35}
  36
  37static inline u64 Maj(u64 x, u64 y, u64 z)
  38{
  39        return (x & y) | (z & (x | y));
  40}
  41
  42static inline u64 RORu64(u64 x, u64 y)
  43{
  44        return (x >> y) | (x << (64 - y));
  45}
  46
  47static const u64 sha512_K[80] = {
  48        0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
  49        0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
  50        0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
  51        0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
  52        0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
  53        0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
  54        0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
  55        0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
  56        0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
  57        0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
  58        0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
  59        0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
  60        0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
  61        0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
  62        0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
  63        0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
  64        0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
  65        0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
  66        0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
  67        0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
  68        0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
  69        0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
  70        0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
  71        0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
  72        0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
  73        0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
  74        0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
  75};
  76
  77#define e0(x)       (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
  78#define e1(x)       (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
  79#define s0(x)       (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
  80#define s1(x)       (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
  81
  82static inline void LOAD_OP(int I, u64 *W, const u8 *input)
  83{
  84        W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
  85}
  86
  87static inline void BLEND_OP(int I, u64 *W)
  88{
  89        W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
  90}
  91
  92static void
  93sha512_transform(u64 *state, const u8 *input)
  94{
  95        u64 a, b, c, d, e, f, g, h, t1, t2;
  96
  97        int i;
  98        u64 *W = get_cpu_var(msg_schedule);
  99
 100        /* load the input */
 101        for (i = 0; i < 16; i++)
 102                LOAD_OP(i, W, input);
 103
 104        for (i = 16; i < 80; i++) {
 105                BLEND_OP(i, W);
 106        }
 107
 108        /* load the state into our registers */
 109        a=state[0];   b=state[1];   c=state[2];   d=state[3];
 110        e=state[4];   f=state[5];   g=state[6];   h=state[7];
 111
 112        /* now iterate */
 113        for (i=0; i<80; i+=8) {
 114                t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[i  ];
 115                t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
 116                t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
 117                t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
 118                t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
 119                t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
 120                t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
 121                t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
 122                t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
 123                t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
 124                t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
 125                t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
 126                t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
 127                t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
 128                t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
 129                t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
 130        }
 131
 132        state[0] += a; state[1] += b; state[2] += c; state[3] += d;
 133        state[4] += e; state[5] += f; state[6] += g; state[7] += h;
 134
 135        /* erase our data */
 136        a = b = c = d = e = f = g = h = t1 = t2 = 0;
 137        memset(W, 0, sizeof(__get_cpu_var(msg_schedule)));
 138        put_cpu_var(msg_schedule);
 139}
 140
 141static int
 142sha512_init(struct shash_desc *desc)
 143{
 144        struct sha512_ctx *sctx = shash_desc_ctx(desc);
 145        sctx->state[0] = SHA512_H0;
 146        sctx->state[1] = SHA512_H1;
 147        sctx->state[2] = SHA512_H2;
 148        sctx->state[3] = SHA512_H3;
 149        sctx->state[4] = SHA512_H4;
 150        sctx->state[5] = SHA512_H5;
 151        sctx->state[6] = SHA512_H6;
 152        sctx->state[7] = SHA512_H7;
 153        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 154
 155        return 0;
 156}
 157
 158static int
 159sha384_init(struct shash_desc *desc)
 160{
 161        struct sha512_ctx *sctx = shash_desc_ctx(desc);
 162        sctx->state[0] = SHA384_H0;
 163        sctx->state[1] = SHA384_H1;
 164        sctx->state[2] = SHA384_H2;
 165        sctx->state[3] = SHA384_H3;
 166        sctx->state[4] = SHA384_H4;
 167        sctx->state[5] = SHA384_H5;
 168        sctx->state[6] = SHA384_H6;
 169        sctx->state[7] = SHA384_H7;
 170        sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 171
 172        return 0;
 173}
 174
 175static int
 176sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 177{
 178        struct sha512_ctx *sctx = shash_desc_ctx(desc);
 179
 180        unsigned int i, index, part_len;
 181
 182        /* Compute number of bytes mod 128 */
 183        index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
 184
 185        /* Update number of bits */
 186        if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 187                if ((sctx->count[1] += 1) < 1)
 188                        if ((sctx->count[2] += 1) < 1)
 189                                sctx->count[3]++;
 190                sctx->count[1] += (len >> 29);
 191        }
 192
 193        part_len = 128 - index;
 194
 195        /* Transform as many times as possible. */
 196        if (len >= part_len) {
 197                memcpy(&sctx->buf[index], data, part_len);
 198                sha512_transform(sctx->state, sctx->buf);
 199
 200                for (i = part_len; i + 127 < len; i+=128)
 201                        sha512_transform(sctx->state, &data[i]);
 202
 203                index = 0;
 204        } else {
 205                i = 0;
 206        }
 207
 208        /* Buffer remaining input */
 209        memcpy(&sctx->buf[index], &data[i], len - i);
 210
 211        return 0;
 212}
 213
 214static int
 215sha512_final(struct shash_desc *desc, u8 *hash)
 216{
 217        struct sha512_ctx *sctx = shash_desc_ctx(desc);
 218        static u8 padding[128] = { 0x80, };
 219        __be64 *dst = (__be64 *)hash;
 220        __be32 bits[4];
 221        unsigned int index, pad_len;
 222        int i;
 223
 224        /* Save number of bits */
 225        bits[3] = cpu_to_be32(sctx->count[0]);
 226        bits[2] = cpu_to_be32(sctx->count[1]);
 227        bits[1] = cpu_to_be32(sctx->count[2]);
 228        bits[0] = cpu_to_be32(sctx->count[3]);
 229
 230        /* Pad out to 112 mod 128. */
 231        index = (sctx->count[0] >> 3) & 0x7f;
 232        pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 233        sha512_update(desc, padding, pad_len);
 234
 235        /* Append length (before padding) */
 236        sha512_update(desc, (const u8 *)bits, sizeof(bits));
 237
 238        /* Store state in digest */
 239        for (i = 0; i < 8; i++)
 240                dst[i] = cpu_to_be64(sctx->state[i]);
 241
 242        /* Zeroize sensitive information. */
 243        memset(sctx, 0, sizeof(struct sha512_ctx));
 244
 245        return 0;
 246}
 247
 248static int sha384_final(struct shash_desc *desc, u8 *hash)
 249{
 250        u8 D[64];
 251
 252        sha512_final(desc, D);
 253
 254        memcpy(hash, D, 48);
 255        memset(D, 0, 64);
 256
 257        return 0;
 258}
 259
 260static struct shash_alg sha512 = {
 261        .digestsize     =       SHA512_DIGEST_SIZE,
 262        .init           =       sha512_init,
 263        .update         =       sha512_update,
 264        .final          =       sha512_final,
 265        .descsize       =       sizeof(struct sha512_ctx),
 266        .base           =       {
 267                .cra_name       =       "sha512",
 268                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 269                .cra_blocksize  =       SHA512_BLOCK_SIZE,
 270                .cra_module     =       THIS_MODULE,
 271        }
 272};
 273
 274static struct shash_alg sha384 = {
 275        .digestsize     =       SHA384_DIGEST_SIZE,
 276        .init           =       sha384_init,
 277        .update         =       sha512_update,
 278        .final          =       sha384_final,
 279        .descsize       =       sizeof(struct sha512_ctx),
 280        .base           =       {
 281                .cra_name       =       "sha384",
 282                .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 283                .cra_blocksize  =       SHA384_BLOCK_SIZE,
 284                .cra_module     =       THIS_MODULE,
 285        }
 286};
 287
 288static int __init sha512_generic_mod_init(void)
 289{
 290        int ret = 0;
 291
 292        if ((ret = crypto_register_shash(&sha384)) < 0)
 293                goto out;
 294        if ((ret = crypto_register_shash(&sha512)) < 0)
 295                crypto_unregister_shash(&sha384);
 296out:
 297        return ret;
 298}
 299
 300static void __exit sha512_generic_mod_fini(void)
 301{
 302        crypto_unregister_shash(&sha384);
 303        crypto_unregister_shash(&sha512);
 304}
 305
 306module_init(sha512_generic_mod_init);
 307module_exit(sha512_generic_mod_fini);
 308
 309MODULE_LICENSE("GPL");
 310MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
 311
 312MODULE_ALIAS("sha384");
 313MODULE_ALIAS("sha512");
 314