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Linux/crypto/md5.c

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  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>
 20 #include <linux/init.h>
 21 #include <linux/module.h>
 22 #include <linux/string.h>
 23 #include <linux/types.h>
 24 #include <linux/cryptohash.h>
 25 #include <asm/byteorder.h>
 26 
 27 /* XXX: this stuff can be optimized */
 28 static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
 29 {
 30         while (words--) {
 31                 __le32_to_cpus(buf);
 32                 buf++;
 33         }
 34 }
 35 
 36 static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
 37 {
 38         while (words--) {
 39                 __cpu_to_le32s(buf);
 40                 buf++;
 41         }
 42 }
 43 
 44 static inline void md5_transform_helper(struct md5_state *ctx)
 45 {
 46         le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
 47         md5_transform(ctx->hash, ctx->block);
 48 }
 49 
 50 static int md5_init(struct shash_desc *desc)
 51 {
 52         struct md5_state *mctx = shash_desc_ctx(desc);
 53 
 54         mctx->hash[0] = 0x67452301;
 55         mctx->hash[1] = 0xefcdab89;
 56         mctx->hash[2] = 0x98badcfe;
 57         mctx->hash[3] = 0x10325476;
 58         mctx->byte_count = 0;
 59 
 60         return 0;
 61 }
 62 
 63 static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 64 {
 65         struct md5_state *mctx = shash_desc_ctx(desc);
 66         const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 67 
 68         mctx->byte_count += len;
 69 
 70         if (avail > len) {
 71                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 72                        data, len);
 73                 return 0;
 74         }
 75 
 76         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 77                data, avail);
 78 
 79         md5_transform_helper(mctx);
 80         data += avail;
 81         len -= avail;
 82 
 83         while (len >= sizeof(mctx->block)) {
 84                 memcpy(mctx->block, data, sizeof(mctx->block));
 85                 md5_transform_helper(mctx);
 86                 data += sizeof(mctx->block);
 87                 len -= sizeof(mctx->block);
 88         }
 89 
 90         memcpy(mctx->block, data, len);
 91 
 92         return 0;
 93 }
 94 
 95 static int md5_final(struct shash_desc *desc, u8 *out)
 96 {
 97         struct md5_state *mctx = shash_desc_ctx(desc);
 98         const unsigned int offset = mctx->byte_count & 0x3f;
 99         char *p = (char *)mctx->block + offset;
100         int padding = 56 - (offset + 1);
101 
102         *p++ = 0x80;
103         if (padding < 0) {
104                 memset(p, 0x00, padding + sizeof (u64));
105                 md5_transform_helper(mctx);
106                 p = (char *)mctx->block;
107                 padding = 56;
108         }
109 
110         memset(p, 0, padding);
111         mctx->block[14] = mctx->byte_count << 3;
112         mctx->block[15] = mctx->byte_count >> 29;
113         le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
114                           sizeof(u64)) / sizeof(u32));
115         md5_transform(mctx->hash, mctx->block);
116         cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
117         memcpy(out, mctx->hash, sizeof(mctx->hash));
118         memset(mctx, 0, sizeof(*mctx));
119 
120         return 0;
121 }
122 
123 static int md5_export(struct shash_desc *desc, void *out)
124 {
125         struct md5_state *ctx = shash_desc_ctx(desc);
126 
127         memcpy(out, ctx, sizeof(*ctx));
128         return 0;
129 }
130 
131 static int md5_import(struct shash_desc *desc, const void *in)
132 {
133         struct md5_state *ctx = shash_desc_ctx(desc);
134 
135         memcpy(ctx, in, sizeof(*ctx));
136         return 0;
137 }
138 
139 static struct shash_alg alg = {
140         .digestsize     =       MD5_DIGEST_SIZE,
141         .init           =       md5_init,
142         .update         =       md5_update,
143         .final          =       md5_final,
144         .export         =       md5_export,
145         .import         =       md5_import,
146         .descsize       =       sizeof(struct md5_state),
147         .statesize      =       sizeof(struct md5_state),
148         .base           =       {
149                 .cra_name       =       "md5",
150                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
151                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
152                 .cra_module     =       THIS_MODULE,
153         }
154 };
155 
156 static int __init md5_mod_init(void)
157 {
158         return crypto_register_shash(&alg);
159 }
160 
161 static void __exit md5_mod_fini(void)
162 {
163         crypto_unregister_shash(&alg);
164 }
165 
166 module_init(md5_mod_init);
167 module_exit(md5_mod_fini);
168 
169 MODULE_LICENSE("GPL");
170 MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
171 

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