md5.c (5a2dd72abdae75ea2960145e0549635ce4e0be96) md5.c (7d6f75eb21b84cdc5dfb09789974f02b42a89058)
1/*
2 * Cryptographic API.
3 *
4 * MD5 Message Digest Algorithm (RFC1321).
5 *
6 * Derived from cryptoapi implementation, originally based on the
7 * public domain implementation written by Colin Plumb in 1993.
8 *
9 * Copyright (c) Cryptoapi developers.
10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 */
18#include <crypto/internal/hash.h>
1/*
2 * Cryptographic API.
3 *
4 * MD5 Message Digest Algorithm (RFC1321).
5 *
6 * Derived from cryptoapi implementation, originally based on the
7 * public domain implementation written by Colin Plumb in 1993.
8 *
9 * Copyright (c) Cryptoapi developers.
10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 */
18#include <crypto/internal/hash.h>
19#include <crypto/md5.h>
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/types.h>
23#include <asm/byteorder.h>
24
20#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/string.h>
23#include <linux/types.h>
24#include <asm/byteorder.h>
25
25#define MD5_DIGEST_SIZE 16
26#define MD5_HMAC_BLOCK_SIZE 64
27#define MD5_BLOCK_WORDS 16
28#define MD5_HASH_WORDS 4
29
30#define F1(x, y, z) (z ^ (x & (y ^ z)))
31#define F2(x, y, z) F1(z, x, y)
32#define F3(x, y, z) (x ^ y ^ z)
33#define F4(x, y, z) (y ^ (x | ~z))
34
35#define MD5STEP(f, w, x, y, z, in, s) \
36 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
37
26#define F1(x, y, z) (z ^ (x & (y ^ z)))
27#define F2(x, y, z) F1(z, x, y)
28#define F3(x, y, z) (x ^ y ^ z)
29#define F4(x, y, z) (y ^ (x | ~z))
30
31#define MD5STEP(f, w, x, y, z, in, s) \
32 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
33
38struct md5_ctx {
39 u32 hash[MD5_HASH_WORDS];
40 u32 block[MD5_BLOCK_WORDS];
41 u64 byte_count;
42};
43
44static void md5_transform(u32 *hash, u32 const *in)
45{
46 u32 a, b, c, d;
47
48 a = hash[0];
49 b = hash[1];
50 c = hash[2];
51 d = hash[3];

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136static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
137{
138 while (words--) {
139 __cpu_to_le32s(buf);
140 buf++;
141 }
142}
143
34static void md5_transform(u32 *hash, u32 const *in)
35{
36 u32 a, b, c, d;
37
38 a = hash[0];
39 b = hash[1];
40 c = hash[2];
41 d = hash[3];

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126static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
127{
128 while (words--) {
129 __cpu_to_le32s(buf);
130 buf++;
131 }
132}
133
144static inline void md5_transform_helper(struct md5_ctx *ctx)
134static inline void md5_transform_helper(struct md5_state *ctx)
145{
146 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
147 md5_transform(ctx->hash, ctx->block);
148}
149
150static int md5_init(struct shash_desc *desc)
151{
135{
136 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
137 md5_transform(ctx->hash, ctx->block);
138}
139
140static int md5_init(struct shash_desc *desc)
141{
152 struct md5_ctx *mctx = shash_desc_ctx(desc);
142 struct md5_state *mctx = shash_desc_ctx(desc);
153
154 mctx->hash[0] = 0x67452301;
155 mctx->hash[1] = 0xefcdab89;
156 mctx->hash[2] = 0x98badcfe;
157 mctx->hash[3] = 0x10325476;
158 mctx->byte_count = 0;
159
160 return 0;
161}
162
163static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
164{
143
144 mctx->hash[0] = 0x67452301;
145 mctx->hash[1] = 0xefcdab89;
146 mctx->hash[2] = 0x98badcfe;
147 mctx->hash[3] = 0x10325476;
148 mctx->byte_count = 0;
149
150 return 0;
151}
152
153static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
154{
165 struct md5_ctx *mctx = shash_desc_ctx(desc);
155 struct md5_state *mctx = shash_desc_ctx(desc);
166 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
167
168 mctx->byte_count += len;
169
170 if (avail > len) {
171 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
172 data, len);
173 return 0;

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189
190 memcpy(mctx->block, data, len);
191
192 return 0;
193}
194
195static int md5_final(struct shash_desc *desc, u8 *out)
196{
156 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
157
158 mctx->byte_count += len;
159
160 if (avail > len) {
161 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
162 data, len);
163 return 0;

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179
180 memcpy(mctx->block, data, len);
181
182 return 0;
183}
184
185static int md5_final(struct shash_desc *desc, u8 *out)
186{
197 struct md5_ctx *mctx = shash_desc_ctx(desc);
187 struct md5_state *mctx = shash_desc_ctx(desc);
198 const unsigned int offset = mctx->byte_count & 0x3f;
199 char *p = (char *)mctx->block + offset;
200 int padding = 56 - (offset + 1);
201
202 *p++ = 0x80;
203 if (padding < 0) {
204 memset(p, 0x00, padding + sizeof (u64));
205 md5_transform_helper(mctx);

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215 md5_transform(mctx->hash, mctx->block);
216 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
217 memcpy(out, mctx->hash, sizeof(mctx->hash));
218 memset(mctx, 0, sizeof(*mctx));
219
220 return 0;
221}
222
188 const unsigned int offset = mctx->byte_count & 0x3f;
189 char *p = (char *)mctx->block + offset;
190 int padding = 56 - (offset + 1);
191
192 *p++ = 0x80;
193 if (padding < 0) {
194 memset(p, 0x00, padding + sizeof (u64));
195 md5_transform_helper(mctx);

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205 md5_transform(mctx->hash, mctx->block);
206 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
207 memcpy(out, mctx->hash, sizeof(mctx->hash));
208 memset(mctx, 0, sizeof(*mctx));
209
210 return 0;
211}
212
213static int md5_export(struct shash_desc *desc, void *out)
214{
215 struct md5_state *ctx = shash_desc_ctx(desc);
216
217 memcpy(out, ctx, sizeof(*ctx));
218 return 0;
219}
220
221static int md5_import(struct shash_desc *desc, const void *in)
222{
223 struct md5_state *ctx = shash_desc_ctx(desc);
224
225 memcpy(ctx, in, sizeof(*ctx));
226 return 0;
227}
228
223static struct shash_alg alg = {
224 .digestsize = MD5_DIGEST_SIZE,
225 .init = md5_init,
226 .update = md5_update,
227 .final = md5_final,
229static struct shash_alg alg = {
230 .digestsize = MD5_DIGEST_SIZE,
231 .init = md5_init,
232 .update = md5_update,
233 .final = md5_final,
228 .descsize = sizeof(struct md5_ctx),
234 .export = md5_export,
235 .import = md5_import,
236 .descsize = sizeof(struct md5_state),
229 .base = {
230 .cra_name = "md5",
231 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
232 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
233 .cra_module = THIS_MODULE,
234 }
235};
236

--- 15 unchanged lines hidden --- 		237 .base = {
238 .cra_name = "md5",
239 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
240 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
241 .cra_module = THIS_MODULE,
242 }
243};
244

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