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] = cpu_to_le32(MD5_H0); 72 mctx->hash[1] = cpu_to_le32(MD5_H1); 73 mctx->hash[2] = cpu_to_le32(MD5_H2); 74 mctx->hash[3] = cpu_to_le32(MD5_H3); 75 mctx->byte_count = 0; 76 77 return 0; 78 } 79 80 static int octeon_md5_update(struct shash_desc *desc, const u8 *data, 81 unsigned int len) 82 { 83 struct md5_state *mctx = shash_desc_ctx(desc); 84 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 85 struct octeon_cop2_state state; 86 unsigned long flags; 87 88 mctx->byte_count += len; 89 90 if (avail > len) { 91 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 92 data, len); 93 return 0; 94 } 95 96 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, 97 avail); 98 99 flags = octeon_crypto_enable(&state); 100 octeon_md5_store_hash(mctx); 101 102 octeon_md5_transform(mctx->block); 103 data += avail; 104 len -= avail; 105 106 while (len >= sizeof(mctx->block)) { 107 octeon_md5_transform(data); 108 data += sizeof(mctx->block); 109 len -= sizeof(mctx->block); 110 } 111 112 octeon_md5_read_hash(mctx); 113 octeon_crypto_disable(&state, flags); 114 115 memcpy(mctx->block, data, len); 116 117 return 0; 118 } 119 120 static int octeon_md5_final(struct shash_desc *desc, u8 *out) 121 { 122 struct md5_state *mctx = shash_desc_ctx(desc); 123 const unsigned int offset = mctx->byte_count & 0x3f; 124 char *p = (char *)mctx->block + offset; 125 int padding = 56 - (offset + 1); 126 struct octeon_cop2_state state; 127 unsigned long flags; 128 129 *p++ = 0x80; 130 131 flags = octeon_crypto_enable(&state); 132 octeon_md5_store_hash(mctx); 133 134 if (padding < 0) { 135 memset(p, 0x00, padding + sizeof(u64)); 136 octeon_md5_transform(mctx->block); 137 p = (char *)mctx->block; 138 padding = 56; 139 } 140 141 memset(p, 0, padding); 142 mctx->block[14] = cpu_to_le32(mctx->byte_count << 3); 143 mctx->block[15] = cpu_to_le32(mctx->byte_count >> 29); 144 octeon_md5_transform(mctx->block); 145 146 octeon_md5_read_hash(mctx); 147 octeon_crypto_disable(&state, flags); 148 149 memcpy(out, mctx->hash, sizeof(mctx->hash)); 150 memset(mctx, 0, sizeof(*mctx)); 151 152 return 0; 153 } 154 155 static int octeon_md5_export(struct shash_desc *desc, void *out) 156 { 157 struct md5_state *ctx = shash_desc_ctx(desc); 158 159 memcpy(out, ctx, sizeof(*ctx)); 160 return 0; 161 } 162 163 static int octeon_md5_import(struct shash_desc *desc, const void *in) 164 { 165 struct md5_state *ctx = shash_desc_ctx(desc); 166 167 memcpy(ctx, in, sizeof(*ctx)); 168 return 0; 169 } 170 171 static struct shash_alg alg = { 172 .digestsize = MD5_DIGEST_SIZE, 173 .init = octeon_md5_init, 174 .update = octeon_md5_update, 175 .final = octeon_md5_final, 176 .export = octeon_md5_export, 177 .import = octeon_md5_import, 178 .descsize = sizeof(struct md5_state), 179 .statesize = sizeof(struct md5_state), 180 .base = { 181 .cra_name = "md5", 182 .cra_driver_name= "octeon-md5", 183 .cra_priority = OCTEON_CR_OPCODE_PRIORITY, 184 .cra_blocksize = MD5_HMAC_BLOCK_SIZE, 185 .cra_module = THIS_MODULE, 186 } 187 }; 188 189 static int __init md5_mod_init(void) 190 { 191 if (!octeon_has_crypto()) 192 return -ENOTSUPP; 193 return crypto_register_shash(&alg); 194 } 195 196 static void __exit md5_mod_fini(void) 197 { 198 crypto_unregister_shash(&alg); 199 } 200 201 module_init(md5_mod_init); 202 module_exit(md5_mod_fini); 203 204 MODULE_LICENSE("GPL"); 205 MODULE_DESCRIPTION("MD5 Message Digest Algorithm (OCTEON)"); 206 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); 207