xref: /openbmc/linux/crypto/sha512_generic.c (revision f2ea0f5f) 
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 
24 static inline u64 Ch(u64 x, u64 y, u64 z)
25 {
26         return z ^ (x & (y ^ z));
27 }
28 
29 static inline u64 Maj(u64 x, u64 y, u64 z)
30 {
31         return (x & y) | (z & (x | y));
32 }
33 
34 static const u64 sha512_K[80] = {
35         0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
36         0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
37         0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
38         0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
39         0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
40         0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
41         0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
42         0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
43         0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
44         0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
45         0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
46         0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
47         0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
48         0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
49         0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
50         0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
51         0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
52         0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
53         0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
54         0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
55         0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
56         0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
57         0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
58         0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
59         0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
60         0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
61         0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
62 };
63 
64 #define e0(x)       (ror64(x,28) ^ ror64(x,34) ^ ror64(x,39))
65 #define e1(x)       (ror64(x,14) ^ ror64(x,18) ^ ror64(x,41))
66 #define s0(x)       (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
67 #define s1(x)       (ror64(x,19) ^ ror64(x,61) ^ (x >> 6))
68 
69 static inline void LOAD_OP(int I, u64 *W, const u8 *input)
70 {
71 	W[I] = __be64_to_cpu( ((__be64*)(input))[I] );
72 }
73 
74 static inline void BLEND_OP(int I, u64 *W)
75 {
76 	W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]);
77 }
78 
79 static void
80 sha512_transform(u64 *state, const u8 *input)
81 {
82 	u64 a, b, c, d, e, f, g, h, t1, t2;
83 
84 	int i;
85 	u64 W[16];
86 
87 	/* load the state into our registers */
88 	a=state[0];   b=state[1];   c=state[2];   d=state[3];
89 	e=state[4];   f=state[5];   g=state[6];   h=state[7];
90 
91 	/* now iterate */
92 	for (i=0; i<80; i+=8) {
93 		if (!(i & 8)) {
94 			int j;
95 
96 			if (i < 16) {
97 				/* load the input */
98 				for (j = 0; j < 16; j++)
99 					LOAD_OP(i + j, W, input);
100 			} else {
101 				for (j = 0; j < 16; j++) {
102 					BLEND_OP(i + j, W);
103 				}
104 			}
105 		}
106 
107 		t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i  ] + W[(i & 15)];
108 		t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
109 		t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[(i & 15) + 1];
110 		t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
111 		t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[(i & 15) + 2];
112 		t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
113 		t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[(i & 15) + 3];
114 		t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
115 		t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[(i & 15) + 4];
116 		t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
117 		t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[(i & 15) + 5];
118 		t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
119 		t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[(i & 15) + 6];
120 		t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
121 		t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[(i & 15) + 7];
122 		t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
123 	}
124 
125 	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
126 	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
127 
128 	/* erase our data */
129 	a = b = c = d = e = f = g = h = t1 = t2 = 0;
130 }
131 
132 static int
133 sha512_init(struct shash_desc *desc)
134 {
135 	struct sha512_state *sctx = shash_desc_ctx(desc);
136 	sctx->state[0] = SHA512_H0;
137 	sctx->state[1] = SHA512_H1;
138 	sctx->state[2] = SHA512_H2;
139 	sctx->state[3] = SHA512_H3;
140 	sctx->state[4] = SHA512_H4;
141 	sctx->state[5] = SHA512_H5;
142 	sctx->state[6] = SHA512_H6;
143 	sctx->state[7] = SHA512_H7;
144 	sctx->count[0] = sctx->count[1] = 0;
145 
146 	return 0;
147 }
148 
149 static int
150 sha384_init(struct shash_desc *desc)
151 {
152 	struct sha512_state *sctx = shash_desc_ctx(desc);
153 	sctx->state[0] = SHA384_H0;
154 	sctx->state[1] = SHA384_H1;
155 	sctx->state[2] = SHA384_H2;
156 	sctx->state[3] = SHA384_H3;
157 	sctx->state[4] = SHA384_H4;
158 	sctx->state[5] = SHA384_H5;
159 	sctx->state[6] = SHA384_H6;
160 	sctx->state[7] = SHA384_H7;
161 	sctx->count[0] = sctx->count[1] = 0;
162 
163 	return 0;
164 }
165 
166 static int
167 sha512_update(struct shash_desc *desc, const u8 *data, unsigned int len)
168 {
169 	struct sha512_state *sctx = shash_desc_ctx(desc);
170 
171 	unsigned int i, index, part_len;
172 
173 	/* Compute number of bytes mod 128 */
174 	index = sctx->count[0] & 0x7f;
175 
176 	/* Update number of bytes */
177 	if (!(sctx->count[0] += len))
178 		sctx->count[1]++;
179 
180         part_len = 128 - index;
181 
182 	/* Transform as many times as possible. */
183 	if (len >= part_len) {
184 		memcpy(&sctx->buf[index], data, part_len);
185 		sha512_transform(sctx->state, sctx->buf);
186 
187 		for (i = part_len; i + 127 < len; i+=128)
188 			sha512_transform(sctx->state, &data[i]);
189 
190 		index = 0;
191 	} else {
192 		i = 0;
193 	}
194 
195 	/* Buffer remaining input */
196 	memcpy(&sctx->buf[index], &data[i], len - i);
197 
198 	return 0;
199 }
200 
201 static int
202 sha512_final(struct shash_desc *desc, u8 *hash)
203 {
204 	struct sha512_state *sctx = shash_desc_ctx(desc);
205         static u8 padding[128] = { 0x80, };
206 	__be64 *dst = (__be64 *)hash;
207 	__be64 bits[2];
208 	unsigned int index, pad_len;
209 	int i;
210 
211 	/* Save number of bits */
212 	bits[1] = cpu_to_be64(sctx->count[0] << 3);
213 	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
214 
215 	/* Pad out to 112 mod 128. */
216 	index = sctx->count[0] & 0x7f;
217 	pad_len = (index < 112) ? (112 - index) : ((128+112) - index);
218 	sha512_update(desc, padding, pad_len);
219 
220 	/* Append length (before padding) */
221 	sha512_update(desc, (const u8 *)bits, sizeof(bits));
222 
223 	/* Store state in digest */
224 	for (i = 0; i < 8; i++)
225 		dst[i] = cpu_to_be64(sctx->state[i]);
226 
227 	/* Zeroize sensitive information. */
228 	memset(sctx, 0, sizeof(struct sha512_state));
229 
230 	return 0;
231 }
232 
233 static int sha384_final(struct shash_desc *desc, u8 *hash)
234 {
235 	u8 D[64];
236 
237 	sha512_final(desc, D);
238 
239 	memcpy(hash, D, 48);
240 	memset(D, 0, 64);
241 
242 	return 0;
243 }
244 
245 static struct shash_alg sha512 = {
246 	.digestsize	=	SHA512_DIGEST_SIZE,
247 	.init		=	sha512_init,
248 	.update		=	sha512_update,
249 	.final		=	sha512_final,
250 	.descsize	=	sizeof(struct sha512_state),
251 	.base		=	{
252 		.cra_name	=	"sha512",
253 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
254 		.cra_blocksize	=	SHA512_BLOCK_SIZE,
255 		.cra_module	=	THIS_MODULE,
256 	}
257 };
258 
259 static struct shash_alg sha384 = {
260 	.digestsize	=	SHA384_DIGEST_SIZE,
261 	.init		=	sha384_init,
262 	.update		=	sha512_update,
263 	.final		=	sha384_final,
264 	.descsize	=	sizeof(struct sha512_state),
265 	.base		=	{
266 		.cra_name	=	"sha384",
267 		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
268 		.cra_blocksize	=	SHA384_BLOCK_SIZE,
269 		.cra_module	=	THIS_MODULE,
270 	}
271 };
272 
273 static int __init sha512_generic_mod_init(void)
274 {
275         int ret = 0;
276 
277         if ((ret = crypto_register_shash(&sha384)) < 0)
278                 goto out;
279         if ((ret = crypto_register_shash(&sha512)) < 0)
280                 crypto_unregister_shash(&sha384);
281 out:
282         return ret;
283 }
284 
285 static void __exit sha512_generic_mod_fini(void)
286 {
287         crypto_unregister_shash(&sha384);
288         crypto_unregister_shash(&sha512);
289 }
290 
291 module_init(sha512_generic_mod_init);
292 module_exit(sha512_generic_mod_fini);
293 
294 MODULE_LICENSE("GPL");
295 MODULE_DESCRIPTION("SHA-512 and SHA-384 Secure Hash Algorithms");
296 
297 MODULE_ALIAS("sha384");
298 MODULE_ALIAS("sha512");
299