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Linux/arch/mips/cavium-octeon/crypto/octeon-md5.c

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  1 /*
  2  * Cryptographic API.
  3  *
  4  * MD5 Message Digest Algorithm (RFC1321).
  5  *
  6  * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>.
  7  *
  8  * Based on crypto/md5.c, which is:
  9  *
 10  * Derived from cryptoapi implementation, originally based on the
 11  * public domain implementation written by Colin Plumb in 1993.
 12  *
 13  * Copyright (c) Cryptoapi developers.
 14  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 15  *
 16  * This program is free software; you can redistribute it and/or modify it
 17  * under the terms of the GNU General Public License as published by the Free
 18  * Software Foundation; either version 2 of the License, or (at your option)
 19  * any later version.
 20  */
 21 
 22 #include <crypto/md5.h>
 23 #include <linux/init.h>
 24 #include <linux/types.h>
 25 #include <linux/module.h>
 26 #include <linux/string.h>
 27 #include <asm/byteorder.h>
 28 #include <linux/cryptohash.h>
 29 #include <asm/octeon/octeon.h>
 30 #include <crypto/internal/hash.h>
 31 
 32 #include "octeon-crypto.h"
 33 
 34 /*
 35  * We pass everything as 64-bit. OCTEON can handle misaligned data.
 36  */
 37 
 38 static void octeon_md5_store_hash(struct md5_state *ctx)
 39 {
 40         u64 *hash = (u64 *)ctx->hash;
 41 
 42         write_octeon_64bit_hash_dword(hash[0], 0);
 43         write_octeon_64bit_hash_dword(hash[1], 1);
 44 }
 45 
 46 static void octeon_md5_read_hash(struct md5_state *ctx)
 47 {
 48         u64 *hash = (u64 *)ctx->hash;
 49 
 50         hash[0] = read_octeon_64bit_hash_dword(0);
 51         hash[1] = read_octeon_64bit_hash_dword(1);
 52 }
 53 
 54 static void octeon_md5_transform(const void *_block)
 55 {
 56         const u64 *block = _block;
 57 
 58         write_octeon_64bit_block_dword(block[0], 0);
 59         write_octeon_64bit_block_dword(block[1], 1);
 60         write_octeon_64bit_block_dword(block[2], 2);
 61         write_octeon_64bit_block_dword(block[3], 3);
 62         write_octeon_64bit_block_dword(block[4], 4);
 63         write_octeon_64bit_block_dword(block[5], 5);
 64         write_octeon_64bit_block_dword(block[6], 6);
 65         octeon_md5_start(block[7]);
 66 }
 67 
 68 static int octeon_md5_init(struct shash_desc *desc)
 69 {
 70         struct md5_state *mctx = shash_desc_ctx(desc);
 71 
 72         mctx->hash[0] = cpu_to_le32(MD5_H0);
 73         mctx->hash[1] = cpu_to_le32(MD5_H1);
 74         mctx->hash[2] = cpu_to_le32(MD5_H2);
 75         mctx->hash[3] = cpu_to_le32(MD5_H3);
 76         mctx->byte_count = 0;
 77 
 78         return 0;
 79 }
 80 
 81 static int octeon_md5_update(struct shash_desc *desc, const u8 *data,
 82                              unsigned int len)
 83 {
 84         struct md5_state *mctx = shash_desc_ctx(desc);
 85         const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 86         struct octeon_cop2_state state;
 87         unsigned long flags;
 88 
 89         mctx->byte_count += len;
 90 
 91         if (avail > len) {
 92                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 93                        data, len);
 94                 return 0;
 95         }
 96 
 97         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data,
 98                avail);
 99 
100         flags = octeon_crypto_enable(&state);
101         octeon_md5_store_hash(mctx);
102 
103         octeon_md5_transform(mctx->block);
104         data += avail;
105         len -= avail;
106 
107         while (len >= sizeof(mctx->block)) {
108                 octeon_md5_transform(data);
109                 data += sizeof(mctx->block);
110                 len -= sizeof(mctx->block);
111         }
112 
113         octeon_md5_read_hash(mctx);
114         octeon_crypto_disable(&state, flags);
115 
116         memcpy(mctx->block, data, len);
117 
118         return 0;
119 }
120 
121 static int octeon_md5_final(struct shash_desc *desc, u8 *out)
122 {
123         struct md5_state *mctx = shash_desc_ctx(desc);
124         const unsigned int offset = mctx->byte_count & 0x3f;
125         char *p = (char *)mctx->block + offset;
126         int padding = 56 - (offset + 1);
127         struct octeon_cop2_state state;
128         unsigned long flags;
129 
130         *p++ = 0x80;
131 
132         flags = octeon_crypto_enable(&state);
133         octeon_md5_store_hash(mctx);
134 
135         if (padding < 0) {
136                 memset(p, 0x00, padding + sizeof(u64));
137                 octeon_md5_transform(mctx->block);
138                 p = (char *)mctx->block;
139                 padding = 56;
140         }
141 
142         memset(p, 0, padding);
143         mctx->block[14] = cpu_to_le32(mctx->byte_count << 3);
144         mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29);
145         octeon_md5_transform(mctx->block);
146 
147         octeon_md5_read_hash(mctx);
148         octeon_crypto_disable(&state, flags);
149 
150         memcpy(out, mctx->hash, sizeof(mctx->hash));
151         memset(mctx, 0, sizeof(*mctx));
152 
153         return 0;
154 }
155 
156 static int octeon_md5_export(struct shash_desc *desc, void *out)
157 {
158         struct md5_state *ctx = shash_desc_ctx(desc);
159 
160         memcpy(out, ctx, sizeof(*ctx));
161         return 0;
162 }
163 
164 static int octeon_md5_import(struct shash_desc *desc, const void *in)
165 {
166         struct md5_state *ctx = shash_desc_ctx(desc);
167 
168         memcpy(ctx, in, sizeof(*ctx));
169         return 0;
170 }
171 
172 static struct shash_alg alg = {
173         .digestsize     =       MD5_DIGEST_SIZE,
174         .init           =       octeon_md5_init,
175         .update         =       octeon_md5_update,
176         .final          =       octeon_md5_final,
177         .export         =       octeon_md5_export,
178         .import         =       octeon_md5_import,
179         .descsize       =       sizeof(struct md5_state),
180         .statesize      =       sizeof(struct md5_state),
181         .base           =       {
182                 .cra_name       =       "md5",
183                 .cra_driver_name=       "octeon-md5",
184                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
185                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
186                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
187                 .cra_module     =       THIS_MODULE,
188         }
189 };
190 
191 static int __init md5_mod_init(void)
192 {
193         if (!octeon_has_crypto())
194                 return -ENOTSUPP;
195         return crypto_register_shash(&alg);
196 }
197 
198 static void __exit md5_mod_fini(void)
199 {
200         crypto_unregister_shash(&alg);
201 }
202 
203 module_init(md5_mod_init);
204 module_exit(md5_mod_fini);
205 
206 MODULE_LICENSE("GPL");
207 MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)");
208 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
209 

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