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

   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 <asm/octeon/octeon.h>
  29 #include <crypto/internal/hash.h>
  30
  31 #include "octeon-crypto.h"
  32
  33 /*
  34  * We pass everything as 64-bit. OCTEON can handle misaligned data.
  35  */
  36
  37 static void octeon_md5_store_hash(struct md5_state *ctx)
  38 {
  39         u64 *hash = (u64 *)ctx->hash;
  40
  41         write_octeon_64bit_hash_dword(hash[0], 0);
  42         write_octeon_64bit_hash_dword(hash[1], 1);
  43 }
  44
  45 static void octeon_md5_read_hash(struct md5_state *ctx)
  46 {
  47         u64 *hash = (u64 *)ctx->hash;
  48
  49         hash[0] = read_octeon_64bit_hash_dword(0);
  50         hash[1] = read_octeon_64bit_hash_dword(1);
  51 }
  52
  53 static void octeon_md5_transform(const void *_block)
  54 {
  55         const u64 *block = _block;
  56
  57         write_octeon_64bit_block_dword(block[0], 0);
  58         write_octeon_64bit_block_dword(block[1], 1);
  59         write_octeon_64bit_block_dword(block[2], 2);
  60         write_octeon_64bit_block_dword(block[3], 3);
  61         write_octeon_64bit_block_dword(block[4], 4);
  62         write_octeon_64bit_block_dword(block[5], 5);
  63         write_octeon_64bit_block_dword(block[6], 6);
  64         octeon_md5_start(block[7]);
  65 }
  66
  67 static int octeon_md5_init(struct shash_desc *desc)
  68 {
  69         struct md5_state *mctx = shash_desc_ctx(desc);
  70
  71         mctx->hash[0] = MD5_H0;
  72         mctx->hash[1] = MD5_H1;
  73         mctx->hash[2] = MD5_H2;
  74         mctx->hash[3] = MD5_H3;
  75         cpu_to_le32_array(mctx->hash, 4);
  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] = mctx->byte_count << 3;
 144         mctx->block[15] = mctx->byte_count >> 29;
 145         cpu_to_le32_array(mctx->block + 14, 2);
 146         octeon_md5_transform(mctx->block);
 147
 148         octeon_md5_read_hash(mctx);
 149         octeon_crypto_disable(&state, flags);
 150
 151         memcpy(out, mctx->hash, sizeof(mctx->hash));
 152         memset(mctx, 0, sizeof(*mctx));
 153
 154         return 0;
 155 }
 156
 157 static int octeon_md5_export(struct shash_desc *desc, void *out)
 158 {
 159         struct md5_state *ctx = shash_desc_ctx(desc);
 160
 161         memcpy(out, ctx, sizeof(*ctx));
 162         return 0;
 163 }
 164
 165 static int octeon_md5_import(struct shash_desc *desc, const void *in)
 166 {
 167         struct md5_state *ctx = shash_desc_ctx(desc);
 168
 169         memcpy(ctx, in, sizeof(*ctx));
 170         return 0;
 171 }
 172
 173 static struct shash_alg alg = {
 174         .digestsize     =       MD5_DIGEST_SIZE,
 175         .init           =       octeon_md5_init,
 176         .update         =       octeon_md5_update,
 177         .final          =       octeon_md5_final,
 178         .export         =       octeon_md5_export,
 179         .import         =       octeon_md5_import,
 180         .descsize       =       sizeof(struct md5_state),
 181         .statesize      =       sizeof(struct md5_state),
 182         .base           =       {
 183                 .cra_name       =       "md5",
 184                 .cra_driver_name=       "octeon-md5",
 185                 .cra_priority   =       OCTEON_CR_OPCODE_PRIORITY,
 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>");