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>"); 209