Aaro Koskinen | 82be2dc | 2015-03-08 22:07:44 +0200 | [diff] [blame^] | 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>"); |