1 /* 2 * Cryptographic API. 3 * 4 * SHA1 Secure Hash Algorithm. 5 * 6 * Adapted for OCTEON by Aaro Koskinen <aaro.koskinen@iki.fi>. 7 * 8 * Based on crypto/sha1_generic.c, which is: 9 * 10 * Copyright (c) Alan Smithee. 11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 12 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 13 * 14 * This program is free software; you can redistribute it and/or modify it 15 * under the terms of the GNU General Public License as published by the Free 16 * Software Foundation; either version 2 of the License, or (at your option) 17 * any later version. 18 */ 19 20 #include <linux/mm.h> 21 #include <crypto/sha.h> 22 #include <linux/init.h> 23 #include <linux/types.h> 24 #include <linux/module.h> 25 #include <asm/byteorder.h> 26 #include <asm/octeon/octeon.h> 27 #include <crypto/internal/hash.h> 28 29 #include "octeon-crypto.h" 30 31 /* 32 * We pass everything as 64-bit. OCTEON can handle misaligned data. 33 */ 34 35 static void octeon_sha1_store_hash(struct sha1_state *sctx) 36 { 37 u64 *hash = (u64 *)sctx->state; 38 union { 39 u32 word[2]; 40 u64 dword; 41 } hash_tail = { { sctx->state[4], } }; 42 43 write_octeon_64bit_hash_dword(hash[0], 0); 44 write_octeon_64bit_hash_dword(hash[1], 1); 45 write_octeon_64bit_hash_dword(hash_tail.dword, 2); 46 memzero_explicit(&hash_tail.word[0], sizeof(hash_tail.word[0])); 47 } 48 49 static void octeon_sha1_read_hash(struct sha1_state *sctx) 50 { 51 u64 *hash = (u64 *)sctx->state; 52 union { 53 u32 word[2]; 54 u64 dword; 55 } hash_tail; 56 57 hash[0] = read_octeon_64bit_hash_dword(0); 58 hash[1] = read_octeon_64bit_hash_dword(1); 59 hash_tail.dword = read_octeon_64bit_hash_dword(2); 60 sctx->state[4] = hash_tail.word[0]; 61 memzero_explicit(&hash_tail.dword, sizeof(hash_tail.dword)); 62 } 63 64 static void octeon_sha1_transform(const void *_block) 65 { 66 const u64 *block = _block; 67 68 write_octeon_64bit_block_dword(block[0], 0); 69 write_octeon_64bit_block_dword(block[1], 1); 70 write_octeon_64bit_block_dword(block[2], 2); 71 write_octeon_64bit_block_dword(block[3], 3); 72 write_octeon_64bit_block_dword(block[4], 4); 73 write_octeon_64bit_block_dword(block[5], 5); 74 write_octeon_64bit_block_dword(block[6], 6); 75 octeon_sha1_start(block[7]); 76 } 77 78 static int octeon_sha1_init(struct shash_desc *desc) 79 { 80 struct sha1_state *sctx = shash_desc_ctx(desc); 81 82 sctx->state[0] = SHA1_H0; 83 sctx->state[1] = SHA1_H1; 84 sctx->state[2] = SHA1_H2; 85 sctx->state[3] = SHA1_H3; 86 sctx->state[4] = SHA1_H4; 87 sctx->count = 0; 88 89 return 0; 90 } 91 92 static void __octeon_sha1_update(struct sha1_state *sctx, const u8 *data, 93 unsigned int len) 94 { 95 unsigned int partial; 96 unsigned int done; 97 const u8 *src; 98 99 partial = sctx->count % SHA1_BLOCK_SIZE; 100 sctx->count += len; 101 done = 0; 102 src = data; 103 104 if ((partial + len) >= SHA1_BLOCK_SIZE) { 105 if (partial) { 106 done = -partial; 107 memcpy(sctx->buffer + partial, data, 108 done + SHA1_BLOCK_SIZE); 109 src = sctx->buffer; 110 } 111 112 do { 113 octeon_sha1_transform(src); 114 done += SHA1_BLOCK_SIZE; 115 src = data + done; 116 } while (done + SHA1_BLOCK_SIZE <= len); 117 118 partial = 0; 119 } 120 memcpy(sctx->buffer + partial, src, len - done); 121 } 122 123 static int octeon_sha1_update(struct shash_desc *desc, const u8 *data, 124 unsigned int len) 125 { 126 struct sha1_state *sctx = shash_desc_ctx(desc); 127 struct octeon_cop2_state state; 128 unsigned long flags; 129 130 /* 131 * Small updates never reach the crypto engine, so the generic sha1 is 132 * faster because of the heavyweight octeon_crypto_enable() / 133 * octeon_crypto_disable(). 134 */ 135 if ((sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 136 return crypto_sha1_update(desc, data, len); 137 138 flags = octeon_crypto_enable(&state); 139 octeon_sha1_store_hash(sctx); 140 141 __octeon_sha1_update(sctx, data, len); 142 143 octeon_sha1_read_hash(sctx); 144 octeon_crypto_disable(&state, flags); 145 146 return 0; 147 } 148 149 static int octeon_sha1_final(struct shash_desc *desc, u8 *out) 150 { 151 struct sha1_state *sctx = shash_desc_ctx(desc); 152 static const u8 padding[64] = { 0x80, }; 153 struct octeon_cop2_state state; 154 __be32 *dst = (__be32 *)out; 155 unsigned int pad_len; 156 unsigned long flags; 157 unsigned int index; 158 __be64 bits; 159 int i; 160 161 /* Save number of bits. */ 162 bits = cpu_to_be64(sctx->count << 3); 163 164 /* Pad out to 56 mod 64. */ 165 index = sctx->count & 0x3f; 166 pad_len = (index < 56) ? (56 - index) : ((64+56) - index); 167 168 flags = octeon_crypto_enable(&state); 169 octeon_sha1_store_hash(sctx); 170 171 __octeon_sha1_update(sctx, padding, pad_len); 172 173 /* Append length (before padding). */ 174 __octeon_sha1_update(sctx, (const u8 *)&bits, sizeof(bits)); 175 176 octeon_sha1_read_hash(sctx); 177 octeon_crypto_disable(&state, flags); 178 179 /* Store state in digest */ 180 for (i = 0; i < 5; i++) 181 dst[i] = cpu_to_be32(sctx->state[i]); 182 183 /* Zeroize sensitive information. */ 184 memset(sctx, 0, sizeof(*sctx)); 185 186 return 0; 187 } 188 189 static int octeon_sha1_export(struct shash_desc *desc, void *out) 190 { 191 struct sha1_state *sctx = shash_desc_ctx(desc); 192 193 memcpy(out, sctx, sizeof(*sctx)); 194 return 0; 195 } 196 197 static int octeon_sha1_import(struct shash_desc *desc, const void *in) 198 { 199 struct sha1_state *sctx = shash_desc_ctx(desc); 200 201 memcpy(sctx, in, sizeof(*sctx)); 202 return 0; 203 } 204 205 static struct shash_alg octeon_sha1_alg = { 206 .digestsize = SHA1_DIGEST_SIZE, 207 .init = octeon_sha1_init, 208 .update = octeon_sha1_update, 209 .final = octeon_sha1_final, 210 .export = octeon_sha1_export, 211 .import = octeon_sha1_import, 212 .descsize = sizeof(struct sha1_state), 213 .statesize = sizeof(struct sha1_state), 214 .base = { 215 .cra_name = "sha1", 216 .cra_driver_name= "octeon-sha1", 217 .cra_priority = OCTEON_CR_OPCODE_PRIORITY, 218 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 219 .cra_blocksize = SHA1_BLOCK_SIZE, 220 .cra_module = THIS_MODULE, 221 } 222 }; 223 224 static int __init octeon_sha1_mod_init(void) 225 { 226 if (!octeon_has_crypto()) 227 return -ENOTSUPP; 228 return crypto_register_shash(&octeon_sha1_alg); 229 } 230 231 static void __exit octeon_sha1_mod_fini(void) 232 { 233 crypto_unregister_shash(&octeon_sha1_alg); 234 } 235 236 module_init(octeon_sha1_mod_init); 237 module_exit(octeon_sha1_mod_fini); 238 239 MODULE_LICENSE("GPL"); 240 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (OCTEON)"); 241 MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); 242