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