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(0x67452301); 73 mctx->hash[1] = cpu_to_le32(0xefcdab89); 74 mctx->hash[2] = cpu_to_le32(0x98badcfe); 75 mctx->hash[3] = cpu_to_le32(0x10325476); 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