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 #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 MODULE_ALIAS("sha384");
  282 
  283 static int __init init(void)
  284 {
  285         int ret = 0;
  286 
  287         if ((ret = crypto_register_alg(&sha384)) < 0)
  288                 goto out;
  289         if ((ret = crypto_register_alg(&sha512)) < 0)
  290                 crypto_unregister_alg(&sha384);
  291 out:
  292         return ret;
  293 }
  294 
  295 static void __exit fini(void)
  296 {
  297         crypto_unregister_alg(&sha384);
  298         crypto_unregister_alg(&sha512);
  299 }
  300 
  301 module_init(init);
  302 module_exit(fini);
  303 
  304 MODULE_LICENSE("GPL");
  305 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
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FreeBSD/Linux Kernel Cross Reference sys/crypto/sha512.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/sha512.c
