Root/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#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
24static DEFINE_PER_CPU(u64[80], msg_schedule);
25
26static inline u64 Ch(u64 x, u64 y, u64 z)
27{
28        return z ^ (x & (y ^ z));
29}
30
31static inline u64 Maj(u64 x, u64 y, u64 z)
32{
33        return (x & y) | (z & (x | y));
34}
35
36static inline u64 RORu64(u64 x, u64 y)
37{
38        return (x >> y) | (x << (64 - y));
39}
40
41static const u64 sha512_K[80] = {
42        0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
43        0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
44        0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
45        0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
46        0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
47        0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
48        0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
49        0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
50        0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
51        0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
52        0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
53        0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
54        0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
55        0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
56        0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
57        0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
58        0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
59        0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
60        0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
61        0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
62        0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
63        0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
64        0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
65        0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
66        0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
67        0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
68        0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
69};
70
71#define e0(x) (RORu64(x,28) ^ RORu64(x,34) ^ RORu64(x,39))
72#define e1(x) (RORu64(x,14) ^ RORu64(x,18) ^ RORu64(x,41))
73#define s0(x) (RORu64(x, 1) ^ RORu64(x, 8) ^ (x >> 7))
74#define s1(x) (RORu64(x,19) ^ RORu64(x,61) ^ (x >> 6))
75
76static inline void LOAD_OP(int I, u64 *W, const u8 *input)
77{
78    W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
79}
80
81static inline void BLEND_OP(int I, u64 *W)
82{
83    W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
84}
85
86static void
87sha512_transform(u64 *state, const u8 *input)
88{
89    u64 a, b, c, d, e, f, g, h, t1, t2;
90
91    int i;
92    u64 *W = get_cpu_var(msg_schedule);
93
94    /* load the input */
95        for (i = 0; i < 16; i++)
96                LOAD_OP(i, W, input);
97
98        for (i = 16; i < 80; i++) {
99                BLEND_OP(i, W);
100        }
101
102    /* load the state into our registers */
103    a=state[0]; b=state[1]; c=state[2]; d=state[3];
104    e=state[4]; f=state[5]; g=state[6]; h=state[7];
105
106    /* now iterate */
107    for (i=0; i<80; i+=8) {
108        t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i ] + W[i ];
109        t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
110        t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[i+1];
111        t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
112        t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[i+2];
113        t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
114        t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[i+3];
115        t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
116        t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[i+4];
117        t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
118        t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[i+5];
119        t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
120        t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[i+6];
121        t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
122        t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[i+7];
123        t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
124    }
125
126    state[0] += a; state[1] += b; state[2] += c; state[3] += d;
127    state[4] += e; state[5] += f; state[6] += g; state[7] += h;
128
129    /* erase our data */
130    a = b = c = d = e = f = g = h = t1 = t2 = 0;
131    memset(W, 0, sizeof(__get_cpu_var(msg_schedule)));
132    put_cpu_var(msg_schedule);
133}
134
135static int
136sha512_init(struct shash_desc *desc)
137{
138    struct sha512_state *sctx = shash_desc_ctx(desc);
139    sctx->state[0] = SHA512_H0;
140    sctx->state[1] = SHA512_H1;
141    sctx->state[2] = SHA512_H2;
142    sctx->state[3] = SHA512_H3;
143    sctx->state[4] = SHA512_H4;
144    sctx->state[5] = SHA512_H5;
145    sctx->state[6] = SHA512_H6;
146    sctx->state[7] = SHA512_H7;
147    sctx->count[0] = sctx->count[1] = 0;
148
149    return 0;
150}
151
152static int
153sha384_init(struct shash_desc *desc)
154{
155    struct sha512_state *sctx = shash_desc_ctx(desc);
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] = 0;
165
166    return 0;
167}
168
169static int
170sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
171{
172    struct sha512_state *sctx = shash_desc_ctx(desc);
173
174    unsigned int i, index, part_len;
175
176    /* Compute number of bytes mod 128 */
177    index = sctx->count[0] & 0x7f;
178
179    /* Update number of bytes */
180    if (!(sctx->count[0] += len))
181        sctx->count[1]++;
182
183        part_len = 128 - index;
184
185    /* Transform as many times as possible. */
186    if (len >= part_len) {
187        memcpy(&sctx->buf[index], data, part_len);
188        sha512_transform(sctx->state, sctx->buf);
189
190        for (i = part_len; i + 127 < len; i+=128)
191            sha512_transform(sctx->state, &data[i]);
192
193        index = 0;
194    } else {
195        i = 0;
196    }
197
198    /* Buffer remaining input */
199    memcpy(&sctx->buf[index], &data[i], len - i);
200
201    return 0;
202}
203
204static int
205sha512_final(struct shash_desc *desc, u8 *hash)
206{
207    struct sha512_state *sctx = shash_desc_ctx(desc);
208        static u8 padding[128] = { 0x80, };
209    __be64 *dst = (__be64 *)hash;
210    __be64 bits[2];
211    unsigned int index, pad_len;
212    int i;
213
214    /* Save number of bits */
215    bits[1] = cpu_to_be64(sctx->count[0] << 3);
216    bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
217
218    /* Pad out to 112 mod 128. */
219    index = sctx->count[0] & 0x7f;
220    pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
221    sha512_update(desc, padding, pad_len);
222
223    /* Append length (before padding) */
224    sha512_update(desc, (const u8 *)bits, sizeof(bits));
225
226    /* Store state in digest */
227    for (i = 0; i < 8; i++)
228        dst[i] = cpu_to_be64(sctx->state[i]);
229
230    /* Zeroize sensitive information. */
231    memset(sctx, 0, sizeof(struct sha512_state));
232
233    return 0;
234}
235
236static int sha384_final(struct shash_desc *desc, u8 *hash)
237{
238    u8 D[64];
239
240    sha512_final(desc, D);
241
242    memcpy(hash, D, 48);
243    memset(D, 0, 64);
244
245    return 0;
246}
247
248static struct shash_alg sha512 = {
249    .digestsize = SHA512_DIGEST_SIZE,
250    .init = sha512_init,
251    .update = sha512_update,
252    .final = sha512_final,
253    .descsize = sizeof(struct sha512_state),
254    .base = {
255        .cra_name = "sha512",
256        .cra_flags = CRYPTO_ALG_TYPE_SHASH,
257        .cra_blocksize = SHA512_BLOCK_SIZE,
258        .cra_module = THIS_MODULE,
259    }
260};
261
262static struct shash_alg sha384 = {
263    .digestsize = SHA384_DIGEST_SIZE,
264    .init = sha384_init,
265    .update = sha512_update,
266    .final = sha384_final,
267    .descsize = sizeof(struct sha512_state),
268    .base = {
269        .cra_name = "sha384",
270        .cra_flags = CRYPTO_ALG_TYPE_SHASH,
271        .cra_blocksize = SHA384_BLOCK_SIZE,
272        .cra_module = THIS_MODULE,
273    }
274};
275
276static int __init sha512_generic_mod_init(void)
277{
278        int ret = 0;
279
280        if ((ret = crypto_register_shash(&sha384)) < 0)
281                goto out;
282        if ((ret = crypto_register_shash(&sha512)) < 0)
283                crypto_unregister_shash(&sha384);
284out:
285        return ret;
286}
287
288static void __exit sha512_generic_mod_fini(void)
289{
290        crypto_unregister_shash(&sha384);
291        crypto_unregister_shash(&sha512);
292}
293
294module_init(sha512_generic_mod_init);
295module_exit(sha512_generic_mod_fini);
296
297MODULE_LICENSE("GPL");
298MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
299
300MODULE_ALIAS("sha384");
301MODULE_ALIAS("sha512");
302

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