1 /* 2 * Cryptographic API. 3 * 4 * SHA-224 and SHA-256 Secure Hash Algorithm. 5 * 6 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>. 7 * 8 * Based on crypto/sha256_generic.c, which is: 9 * 10 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 12 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 13 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> 14 * 15 * This program is free software; you can redistribute it and/or modify it 16 * under the terms of the GNU General Public License as published by the Free 17 * Software Foundation; either version 2 of the License, or (at your option) 18 * any later version. 19 */ 20 21 #include <linux/mm.h> 22 #include <crypto/sha.h> 23 #include <linux/init.h> 24 #include <linux/types.h> 25 #include <linux/module.h> 26 #include <asm/byteorder.h> 27 #include <asm/octeon/octeon.h> 28 #include <crypto/internal/hash.h> 29 30 #include "octeon-crypto.h" 31 32 /* 33 * We pass everything as 64-bit. OCTEON can handle misaligned data. 34 */ 35 36 static void octeon_sha256_store_hash(struct sha256_state *sctx) 37 { 38 u64 *hash = (u64 *)sctx->state; 39 40 write_octeon_64bit_hash_dword(hash[0], 0); 41 write_octeon_64bit_hash_dword(hash[1], 1); 42 write_octeon_64bit_hash_dword(hash[2], 2); 43 write_octeon_64bit_hash_dword(hash[3], 3); 44 } 45 46 static void octeon_sha256_read_hash(struct sha256_state *sctx) 47 { 48 u64 *hash = (u64 *)sctx->state; 49 50 hash[0] = read_octeon_64bit_hash_dword(0); 51 hash[1] = read_octeon_64bit_hash_dword(1); 52 hash[2] = read_octeon_64bit_hash_dword(2); 53 hash[3] = read_octeon_64bit_hash_dword(3); 54 } 55 56 static void octeon_sha256_transform(const void *_block) 57 { 58 const u64 *block = _block; 59 60 write_octeon_64bit_block_dword(block[0], 0); 61 write_octeon_64bit_block_dword(block[1], 1); 62 write_octeon_64bit_block_dword(block[2], 2); 63 write_octeon_64bit_block_dword(block[3], 3); 64 write_octeon_64bit_block_dword(block[4], 4); 65 write_octeon_64bit_block_dword(block[5], 5); 66 write_octeon_64bit_block_dword(block[6], 6); 67 octeon_sha256_start(block[7]); 68 } 69 70 static int octeon_sha224_init(struct shash_desc *desc) 71 { 72 struct sha256_state *sctx = shash_desc_ctx(desc); 73 74 sctx->state[0] = SHA224_H0; 75 sctx->state[1] = SHA224_H1; 76 sctx->state[2] = SHA224_H2; 77 sctx->state[3] = SHA224_H3; 78 sctx->state[4] = SHA224_H4; 79 sctx->state[5] = SHA224_H5; 80 sctx->state[6] = SHA224_H6; 81 sctx->state[7] = SHA224_H7; 82 sctx->count = 0; 83 84 return 0; 85 } 86 87 static int octeon_sha256_init(struct shash_desc *desc) 88 { 89 struct sha256_state *sctx = shash_desc_ctx(desc); 90 91 sctx->state[0] = SHA256_H0; 92 sctx->state[1] = SHA256_H1; 93 sctx->state[2] = SHA256_H2; 94 sctx->state[3] = SHA256_H3; 95 sctx->state[4] = SHA256_H4; 96 sctx->state[5] = SHA256_H5; 97 sctx->state[6] = SHA256_H6; 98 sctx->state[7] = SHA256_H7; 99 sctx->count = 0; 100 101 return 0; 102 } 103 104 static void __octeon_sha256_update(struct sha256_state *sctx, const u8 *data, 105 unsigned int len) 106 { 107 unsigned int partial; 108 unsigned int done; 109 const u8 *src; 110 111 partial = sctx->count % SHA256_BLOCK_SIZE; 112 sctx->count += len; 113 done = 0; 114 src = data; 115 116 if ((partial + len) >= SHA256_BLOCK_SIZE) { 117 if (partial) { 118 done = -partial; 119 memcpy(sctx->buf + partial, data, 120 done + SHA256_BLOCK_SIZE); 121 src = sctx->buf; 122 } 123 124 do { 125 octeon_sha256_transform(src); 126 done += SHA256_BLOCK_SIZE; 127 src = data + done; 128 } while (done + SHA256_BLOCK_SIZE <= len); 129 130 partial = 0; 131 } 132 memcpy(sctx->buf + partial, src, len - done); 133 } 134 135 static int octeon_sha256_update(struct shash_desc *desc, const u8 *data, 136 unsigned int len) 137 { 138 struct sha256_state *sctx = shash_desc_ctx(desc); 139 struct octeon_cop2_state state; 140 unsigned long flags; 141 142 /* 143 * Small updates never reach the crypto engine, so the generic sha256 is 144 * faster because of the heavyweight octeon_crypto_enable() / 145 * octeon_crypto_disable(). 146 */ 147 if ((sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 148 return crypto_sha256_update(desc, data, len); 149 150 flags = octeon_crypto_enable(&state); 151 octeon_sha256_store_hash(sctx); 152 153 __octeon_sha256_update(sctx, data, len); 154 155 octeon_sha256_read_hash(sctx); 156 octeon_crypto_disable(&state, flags); 157 158 return 0; 159 } 160 161 static int octeon_sha256_final(struct shash_desc *desc, u8 *out) 162 { 163 struct sha256_state *sctx = shash_desc_ctx(desc); 164 static const u8 padding[64] = { 0x80, }; 165 struct octeon_cop2_state state; 166 __be32 *dst = (__be32 *)out; 167 unsigned int pad_len; 168 unsigned long flags; 169 unsigned int index; 170 __be64 bits; 171 int i; 172 173 /* Save number of bits. */ 174 bits = cpu_to_be64(sctx->count << 3); 175 176 /* Pad out to 56 mod 64. */ 177 index = sctx->count & 0x3f; 178 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 179 180 flags = octeon_crypto_enable(&state); 181 octeon_sha256_store_hash(sctx); 182 183 __octeon_sha256_update(sctx, padding, pad_len); 184 185 /* Append length (before padding). */ 186 __octeon_sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); 187 188 octeon_sha256_read_hash(sctx); 189 octeon_crypto_disable(&state, flags); 190 191 /* Store state in digest */ 192 for (i = 0; i < 8; i++) 193 dst[i] = cpu_to_be32(sctx->state[i]); 194 195 /* Zeroize sensitive information. */ 196 memset(sctx, 0, sizeof(*sctx)); 197 198 return 0; 199 } 200 201 static int octeon_sha224_final(struct shash_desc *desc, u8 *hash) 202 { 203 u8 D[SHA256_DIGEST_SIZE]; 204 205 octeon_sha256_final(desc, D); 206 207 memcpy(hash, D, SHA224_DIGEST_SIZE); 208 memzero_explicit(D, SHA256_DIGEST_SIZE); 209 210 return 0; 211 } 212 213 static int octeon_sha256_export(struct shash_desc *desc, void *out) 214 { 215 struct sha256_state *sctx = shash_desc_ctx(desc); 216 217 memcpy(out, sctx, sizeof(*sctx)); 218 return 0; 219 } 220 221 static int octeon_sha256_import(struct shash_desc *desc, const void *in) 222 { 223 struct sha256_state *sctx = shash_desc_ctx(desc); 224 225 memcpy(sctx, in, sizeof(*sctx)); 226 return 0; 227 } 228 229 static struct shash_alg octeon_sha256_algs[2] = { { 230 .digestsize = SHA256_DIGEST_SIZE, 231 .init = octeon_sha256_init, 232 .update = octeon_sha256_update, 233 .final = octeon_sha256_final, 234 .export = octeon_sha256_export, 235 .import = octeon_sha256_import, 236 .descsize = sizeof(struct sha256_state), 237 .statesize = sizeof(struct sha256_state), 238 .base = { 239 .cra_name = "sha256", 240 .cra_driver_name= "octeon-sha256", 241 .cra_priority = OCTEON_CR_OPCODE_PRIORITY, 242 .cra_blocksize = SHA256_BLOCK_SIZE, 243 .cra_module = THIS_MODULE, 244 } 245 }, { 246 .digestsize = SHA224_DIGEST_SIZE, 247 .init = octeon_sha224_init, 248 .update = octeon_sha256_update, 249 .final = octeon_sha224_final, 250 .descsize = sizeof(struct sha256_state), 251 .base = { 252 .cra_name = "sha224", 253 .cra_driver_name= "octeon-sha224", 254 .cra_blocksize = SHA224_BLOCK_SIZE, 255 .cra_module = THIS_MODULE, 256 } 257 } }; 258 259 static int __init octeon_sha256_mod_init(void) 260 { 261 if (!octeon_has_crypto()) 262 return -ENOTSUPP; 263 return crypto_register_shashes(octeon_sha256_algs, 264 ARRAY_SIZE(octeon_sha256_algs)); 265 } 266 267 static void __exit octeon_sha256_mod_fini(void) 268 { 269 crypto_unregister_shashes(octeon_sha256_algs, 270 ARRAY_SIZE(octeon_sha256_algs)); 271 } 272 273 module_init(octeon_sha256_mod_init); 274 module_exit(octeon_sha256_mod_fini); 275 276 MODULE_LICENSE("GPL"); 277 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm (OCTEON)"); 278 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); 279