crypto/sha512_generic.c

   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 #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
  24 struct sha512_ctx {
  25         u64 state[8];
  26         u32 count[4];
  27         u8 buf[128];
  28 };
  29
  30 static DEFINE_PER_CPU(u64[80], msg_schedule);
  31
  32 static inline u64 Ch(u64 x, u64 y, u64 z)
  33 {
  34         return z ^ (x & (y ^ z));
  35 }
  36
  37 static inline u64 Maj(u64 x, u64 y, u64 z)
  38 {
  39         return (x & y) | (z & (x | y));
  40 }
  41
  42 static inline u64 RORu64(u64 x, u64 y)
  43 {
  44         return (x >> y) | (x << (64 - y));
  45 }
  46
  47 static 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
  82 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
  83 {
  84         W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
  85 }
  86
  87 static 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
  92 static void
  93 sha512_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
 141 static void
 142 sha512_init(struct crypto_tfm *tfm)
 143 {
 144         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 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
 156 static void
 157 sha384_init(struct crypto_tfm *tfm)
 158 {
 159         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 160         sctx->state[0] = SHA384_H0;
 161         sctx->state[1] = SHA384_H1;
 162         sctx->state[2] = SHA384_H2;
 163         sctx->state[3] = SHA384_H3;
 164         sctx->state[4] = SHA384_H4;
 165         sctx->state[5] = SHA384_H5;
 166         sctx->state[6] = SHA384_H6;
 167         sctx->state[7] = SHA384_H7;
 168         sctx->count[0] = sctx->count[1] = sctx->count[2] = sctx->count[3] = 0;
 169 }
 170
 171 static void
 172 sha512_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 173 {
 174         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 175
 176         unsigned int i, index, part_len;
 177
 178         /* Compute number of bytes mod 128 */
 179         index = (unsigned int)((sctx->count[0] >> 3) & 0x7F);
 180
 181         /* Update number of bits */
 182         if ((sctx->count[0] += (len << 3)) < (len << 3)) {
 183                 if ((sctx->count[1] += 1) < 1)
 184                         if ((sctx->count[2] += 1) < 1)
 185                                 sctx->count[3]++;
 186                 sctx->count[1] += (len >> 29);
 187         }
 188
 189         part_len = 128 - index;
 190
 191         /* Transform as many times as possible. */
 192         if (len >= part_len) {
 193                 memcpy(&sctx->buf[index], data, part_len);
 194                 sha512_transform(sctx->state, sctx->buf);
 195
 196                 for (i = part_len; i + 127 < len; i+=128)
 197                         sha512_transform(sctx->state, &data[i]);
 198
 199                 index = 0;
 200         } else {
 201                 i = 0;
 202         }
 203
 204         /* Buffer remaining input */
 205         memcpy(&sctx->buf[index], &data[i], len - i);
 206 }
 207
 208 static void
 209 sha512_final(struct crypto_tfm *tfm, u8 *hash)
 210 {
 211         struct sha512_ctx *sctx = crypto_tfm_ctx(tfm);
 212         static u8 padding[128] = { 0x80, };
 213         __be64 *dst = (__be64 *)hash;
 214         __be32 bits[4];
 215         unsigned int index, pad_len;
 216         int i;
 217
 218         /* Save number of bits */
 219         bits[3] = cpu_to_be32(sctx->count[0]);
 220         bits[2] = cpu_to_be32(sctx->count[1]);
 221         bits[1] = cpu_to_be32(sctx->count[2]);
 222         bits[0] = cpu_to_be32(sctx->count[3]);
 223
 224         /* Pad out to 112 mod 128. */
 225         index = (sctx->count[0] >> 3) & 0x7f;
 226         pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
 227         sha512_update(tfm, padding, pad_len);
 228
 229         /* Append length (before padding) */
 230         sha512_update(tfm, (const u8 *)bits, sizeof(bits));
 231
 232         /* Store state in digest */
 233         for (i = 0; i < 8; i++)
 234                 dst[i] = cpu_to_be64(sctx->state[i]);
 235
 236         /* Zeroize sensitive information. */
 237         memset(sctx, 0, sizeof(struct sha512_ctx));
 238 }
 239
 240 static void sha384_final(struct crypto_tfm *tfm, u8 *hash)
 241 {
 242         u8 D[64];
 243
 244         sha512_final(tfm, D);
 245
 246         memcpy(hash, D, 48);
 247         memset(D, 0, 64);
 248 }
 249
 250 static struct crypto_alg sha512 = {
 251         .cra_name       = "sha512",
 252         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 253         .cra_blocksize  = SHA512_BLOCK_SIZE,
 254         .cra_ctxsize    = sizeof(struct sha512_ctx),
 255         .cra_module     = THIS_MODULE,
 256         .cra_alignmask  = 3,
 257         .cra_list       = LIST_HEAD_INIT(sha512.cra_list),
 258         .cra_u          = { .digest = {
 259                                 .dia_digestsize = SHA512_DIGEST_SIZE,
 260                                 .dia_init       = sha512_init,
 261                                 .dia_update     = sha512_update,
 262                                 .dia_final      = sha512_final }
 263         }
 264 };
 265
 266 static struct crypto_alg sha384 = {
 267         .cra_name       = "sha384",
 268         .cra_flags      = CRYPTO_ALG_TYPE_DIGEST,
 269         .cra_blocksize  = SHA384_BLOCK_SIZE,
 270         .cra_ctxsize    = sizeof(struct sha512_ctx),
 271         .cra_alignmask  = 3,
 272         .cra_module     = THIS_MODULE,
 273         .cra_list       = LIST_HEAD_INIT(sha384.cra_list),
 274         .cra_u          = { .digest = {
 275                                 .dia_digestsize = SHA384_DIGEST_SIZE,
 276                                 .dia_init       = sha384_init,
 277                                 .dia_update     = sha512_update,
 278                                 .dia_final      = sha384_final }
 279         }
 280 };
 281
 282 static int __init sha512_generic_mod_init(void)
 283 {
 284         int ret = 0;
 285
 286         if ((ret = crypto_register_alg(&sha384)) < 0)
 287                 goto out;
 288         if ((ret = crypto_register_alg(&sha512)) < 0)
 289                 crypto_unregister_alg(&sha384);
 290 out:
 291         return ret;
 292 }
 293
 294 static void __exit sha512_generic_mod_fini(void)
 295 {
 296         crypto_unregister_alg(&sha384);
 297         crypto_unregister_alg(&sha512);
 298 }
 299
 300 module_init(sha512_generic_mod_init);
 301 module_exit(sha512_generic_mod_fini);
 302
 303 MODULE_LICENSE("GPL");
 304 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
 305
 306 MODULE_ALIAS("sha384");
 307 MODULE_ALIAS("sha512");