1 /* 2 * Cryptographic API. 3 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation 4 * 5 * This file is based on sha1_generic.c and sha1_ssse3_glue.c 6 * 7 * Copyright (c) Alan Smithee. 8 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 9 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 10 * Copyright (c) Mathias Krause <minipli@googlemail.com> 11 * 12 * This program is free software; you can redistribute it and/or modify it 13 * under the terms of the GNU General Public License as published by the Free 14 * Software Foundation; either version 2 of the License, or (at your option) 15 * any later version. 16 * 17 */ 18 19 #include <crypto/internal/hash.h> 20 #include <linux/init.h> 21 #include <linux/module.h> 22 #include <linux/cryptohash.h> 23 #include <linux/types.h> 24 #include <crypto/sha.h> 25 #include <asm/byteorder.h> 26 27 28 asmlinkage void sha1_block_data_order(u32 *digest, 29 const unsigned char *data, unsigned int rounds); 30 31 32 static int sha1_init(struct shash_desc *desc) 33 { 34 struct sha1_state *sctx = shash_desc_ctx(desc); 35 36 *sctx = (struct sha1_state){ 37 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, 38 }; 39 40 return 0; 41 } 42 43 44 static int __sha1_update(struct sha1_state *sctx, const u8 *data, 45 unsigned int len, unsigned int partial) 46 { 47 unsigned int done = 0; 48 49 sctx->count += len; 50 51 if (partial) { 52 done = SHA1_BLOCK_SIZE - partial; 53 memcpy(sctx->buffer + partial, data, done); 54 sha1_block_data_order(sctx->state, sctx->buffer, 1); 55 } 56 57 if (len - done >= SHA1_BLOCK_SIZE) { 58 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; 59 sha1_block_data_order(sctx->state, data + done, rounds); 60 done += rounds * SHA1_BLOCK_SIZE; 61 } 62 63 memcpy(sctx->buffer, data + done, len - done); 64 return 0; 65 } 66 67 68 static int sha1_update(struct shash_desc *desc, const u8 *data, 69 unsigned int len) 70 { 71 struct sha1_state *sctx = shash_desc_ctx(desc); 72 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 73 int res; 74 75 /* Handle the fast case right here */ 76 if (partial + len < SHA1_BLOCK_SIZE) { 77 sctx->count += len; 78 memcpy(sctx->buffer + partial, data, len); 79 return 0; 80 } 81 res = __sha1_update(sctx, data, len, partial); 82 return res; 83 } 84 85 86 /* Add padding and return the message digest. */ 87 static int sha1_final(struct shash_desc *desc, u8 *out) 88 { 89 struct sha1_state *sctx = shash_desc_ctx(desc); 90 unsigned int i, index, padlen; 91 __be32 *dst = (__be32 *)out; 92 __be64 bits; 93 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; 94 95 bits = cpu_to_be64(sctx->count << 3); 96 97 /* Pad out to 56 mod 64 and append length */ 98 index = sctx->count % SHA1_BLOCK_SIZE; 99 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); 100 /* We need to fill a whole block for __sha1_update() */ 101 if (padlen <= 56) { 102 sctx->count += padlen; 103 memcpy(sctx->buffer + index, padding, padlen); 104 } else { 105 __sha1_update(sctx, padding, padlen, index); 106 } 107 __sha1_update(sctx, (const u8 *)&bits, sizeof(bits), 56); 108 109 /* Store state in digest */ 110 for (i = 0; i < 5; i++) 111 dst[i] = cpu_to_be32(sctx->state[i]); 112 113 /* Wipe context */ 114 memset(sctx, 0, sizeof(*sctx)); 115 return 0; 116 } 117 118 119 static int sha1_export(struct shash_desc *desc, void *out) 120 { 121 struct sha1_state *sctx = shash_desc_ctx(desc); 122 memcpy(out, sctx, sizeof(*sctx)); 123 return 0; 124 } 125 126 127 static int sha1_import(struct shash_desc *desc, const void *in) 128 { 129 struct sha1_state *sctx = shash_desc_ctx(desc); 130 memcpy(sctx, in, sizeof(*sctx)); 131 return 0; 132 } 133 134 135 static struct shash_alg alg = { 136 .digestsize = SHA1_DIGEST_SIZE, 137 .init = sha1_init, 138 .update = sha1_update, 139 .final = sha1_final, 140 .export = sha1_export, 141 .import = sha1_import, 142 .descsize = sizeof(struct sha1_state), 143 .statesize = sizeof(struct sha1_state), 144 .base = { 145 .cra_name = "sha1", 146 .cra_driver_name= "sha1-asm", 147 .cra_priority = 150, 148 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 149 .cra_blocksize = SHA1_BLOCK_SIZE, 150 .cra_module = THIS_MODULE, 151 } 152 }; 153 154 155 static int __init sha1_mod_init(void) 156 { 157 return crypto_register_shash(&alg); 158 } 159 160 161 static void __exit sha1_mod_fini(void) 162 { 163 crypto_unregister_shash(&alg); 164 } 165 166 167 module_init(sha1_mod_init); 168 module_exit(sha1_mod_fini); 169 170 MODULE_LICENSE("GPL"); 171 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (ARM)"); 172 MODULE_ALIAS("sha1"); 173 MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>"); 174