ia64/linux-2.6.18-xen.hg

view arch/s390/crypto/sha256_s390.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * Cryptographic API.
3 *
4 * s390 implementation of the SHA256 Secure Hash Algorithm.
5 *
6 * s390 Version:
7 * Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
8 * Author(s): Jan Glauber (jang@de.ibm.com)
9 *
10 * Derived from "crypto/sha256.c"
11 * and "arch/s390/crypto/sha1_s390.c"
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
17 *
18 */
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/crypto.h>
23 #include "crypt_s390.h"
25 #define SHA256_DIGEST_SIZE 32
26 #define SHA256_BLOCK_SIZE 64
28 struct s390_sha256_ctx {
29 u64 count;
30 u32 state[8];
31 u8 buf[2 * SHA256_BLOCK_SIZE];
32 };
34 static void sha256_init(struct crypto_tfm *tfm)
35 {
36 struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
38 sctx->state[0] = 0x6a09e667;
39 sctx->state[1] = 0xbb67ae85;
40 sctx->state[2] = 0x3c6ef372;
41 sctx->state[3] = 0xa54ff53a;
42 sctx->state[4] = 0x510e527f;
43 sctx->state[5] = 0x9b05688c;
44 sctx->state[6] = 0x1f83d9ab;
45 sctx->state[7] = 0x5be0cd19;
46 sctx->count = 0;
47 }
49 static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
50 unsigned int len)
51 {
52 struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
53 unsigned int index;
54 int ret;
56 /* how much is already in the buffer? */
57 index = sctx->count / 8 & 0x3f;
59 /* update message bit length */
60 sctx->count += len * 8;
62 if ((index + len) < SHA256_BLOCK_SIZE)
63 goto store;
65 /* process one stored block */
66 if (index) {
67 memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
68 ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
69 SHA256_BLOCK_SIZE);
70 BUG_ON(ret != SHA256_BLOCK_SIZE);
71 data += SHA256_BLOCK_SIZE - index;
72 len -= SHA256_BLOCK_SIZE - index;
73 }
75 /* process as many blocks as possible */
76 if (len >= SHA256_BLOCK_SIZE) {
77 ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, data,
78 len & ~(SHA256_BLOCK_SIZE - 1));
79 BUG_ON(ret != (len & ~(SHA256_BLOCK_SIZE - 1)));
80 data += ret;
81 len -= ret;
82 }
84 store:
85 /* anything left? */
86 if (len)
87 memcpy(sctx->buf + index , data, len);
88 }
90 static void pad_message(struct s390_sha256_ctx* sctx)
91 {
92 int index, end;
94 index = sctx->count / 8 & 0x3f;
95 end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
97 /* start pad with 1 */
98 sctx->buf[index] = 0x80;
100 /* pad with zeros */
101 index++;
102 memset(sctx->buf + index, 0x00, end - index - 8);
104 /* append message length */
105 memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
107 sctx->count = end * 8;
108 }
110 /* Add padding and return the message digest */
111 static void sha256_final(struct crypto_tfm *tfm, u8 *out)
112 {
113 struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
115 /* must perform manual padding */
116 pad_message(sctx);
118 crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
119 sctx->count / 8);
121 /* copy digest to out */
122 memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
124 /* wipe context */
125 memset(sctx, 0, sizeof *sctx);
126 }
128 static struct crypto_alg alg = {
129 .cra_name = "sha256",
130 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
131 .cra_blocksize = SHA256_BLOCK_SIZE,
132 .cra_ctxsize = sizeof(struct s390_sha256_ctx),
133 .cra_module = THIS_MODULE,
134 .cra_list = LIST_HEAD_INIT(alg.cra_list),
135 .cra_u = { .digest = {
136 .dia_digestsize = SHA256_DIGEST_SIZE,
137 .dia_init = sha256_init,
138 .dia_update = sha256_update,
139 .dia_final = sha256_final } }
140 };
142 static int init(void)
143 {
144 int ret;
146 if (!crypt_s390_func_available(KIMD_SHA_256))
147 return -ENOSYS;
149 ret = crypto_register_alg(&alg);
150 if (ret != 0)
151 printk(KERN_INFO "crypt_s390: sha256_s390 couldn't be loaded.");
152 return ret;
153 }
155 static void __exit fini(void)
156 {
157 crypto_unregister_alg(&alg);
158 }
160 module_init(init);
161 module_exit(fini);
163 MODULE_ALIAS("sha256");
165 MODULE_LICENSE("GPL");
166 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");