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 #include <asm/crypto/sha1.h> 27 28 29 asmlinkage void sha1_block_data_order(u32 *digest, 30 const unsigned char *data, unsigned int rounds); 31 32 33 static int sha1_init(struct shash_desc *desc) 34 { 35 struct sha1_state *sctx = shash_desc_ctx(desc); 36 37 *sctx = (struct sha1_state){ 38 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, 39 }; 40 41 return 0; 42 } 43 44 45 static int __sha1_update(struct sha1_state *sctx, const u8 *data, 46 unsigned int len, unsigned int partial) 47 { 48 unsigned int done = 0; 49 50 sctx->count += len; 51 52 if (partial) { 53 done = SHA1_BLOCK_SIZE - partial; 54 memcpy(sctx->buffer + partial, data, done); 55 sha1_block_data_order(sctx->state, sctx->buffer, 1); 56 } 57 58 if (len - done >= SHA1_BLOCK_SIZE) { 59 const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE; 60 sha1_block_data_order(sctx->state, data + done, rounds); 61 done += rounds * SHA1_BLOCK_SIZE; 62 } 63 64 memcpy(sctx->buffer, data + done, len - done); 65 return 0; 66 } 67 68 69 int sha1_update_arm(struct shash_desc *desc, const u8 *data, 70 unsigned int len) 71 { 72 struct sha1_state *sctx = shash_desc_ctx(desc); 73 unsigned int partial = sctx->count % SHA1_BLOCK_SIZE; 74 int res; 75 76 /* Handle the fast case right here */ 77 if (partial + len < SHA1_BLOCK_SIZE) { 78 sctx->count += len; 79 memcpy(sctx->buffer + partial, data, len); 80 return 0; 81 } 82 res = __sha1_update(sctx, data, len, partial); 83 return res; 84 } 85 EXPORT_SYMBOL_GPL(sha1_update_arm); 86 87 88 /* Add padding and return the message digest. */ 89 static int sha1_final(struct shash_desc *desc, u8 *out) 90 { 91 struct sha1_state *sctx = shash_desc_ctx(desc); 92 unsigned int i, index, padlen; 93 __be32 *dst = (__be32 *)out; 94 __be64 bits; 95 static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, }; 96 97 bits = cpu_to_be64(sctx->count << 3); 98 99 /* Pad out to 56 mod 64 and append length */ 100 index = sctx->count % SHA1_BLOCK_SIZE; 101 padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index); 102 /* We need to fill a whole block for __sha1_update() */ 103 if (padlen <= 56) { 104 sctx->count += padlen; 105 memcpy(sctx->buffer + index, padding, padlen); 106 } else { 107 __sha1_update(sctx, padding, padlen, index); 108 } 109 __sha1_update(sctx, (const u8 *)&bits, sizeof(bits), 56); 110 111 /* Store state in digest */ 112 for (i = 0; i < 5; i++) 113 dst[i] = cpu_to_be32(sctx->state[i]); 114 115 /* Wipe context */ 116 memset(sctx, 0, sizeof(*sctx)); 117 return 0; 118 } 119 120 121 static int sha1_export(struct shash_desc *desc, void *out) 122 { 123 struct sha1_state *sctx = shash_desc_ctx(desc); 124 memcpy(out, sctx, sizeof(*sctx)); 125 return 0; 126 } 127 128 129 static int sha1_import(struct shash_desc *desc, const void *in) 130 { 131 struct sha1_state *sctx = shash_desc_ctx(desc); 132 memcpy(sctx, in, sizeof(*sctx)); 133 return 0; 134 } 135 136 137 static struct shash_alg alg = { 138 .digestsize = SHA1_DIGEST_SIZE, 139 .init = sha1_init, 140 .update = sha1_update_arm, 141 .final = sha1_final, 142 .export = sha1_export, 143 .import = sha1_import, 144 .descsize = sizeof(struct sha1_state), 145 .statesize = sizeof(struct sha1_state), 146 .base = { 147 .cra_name = "sha1", 148 .cra_driver_name= "sha1-asm", 149 .cra_priority = 150, 150 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 151 .cra_blocksize = SHA1_BLOCK_SIZE, 152 .cra_module = THIS_MODULE, 153 } 154 }; 155 156 157 static int __init sha1_mod_init(void) 158 { 159 return crypto_register_shash(&alg); 160 } 161 162 163 static void __exit sha1_mod_fini(void) 164 { 165 crypto_unregister_shash(&alg); 166 } 167 168 169 module_init(sha1_mod_init); 170 module_exit(sha1_mod_fini); 171 172 MODULE_LICENSE("GPL"); 173 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm (ARM)"); 174 MODULE_ALIAS("sha1"); 175 MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>"); 176