Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 4 | * s390 implementation of the SHA1 Secure Hash Algorithm. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Derived from cryptoapi implementation, adapted for in-place |
| 7 | * scatterlist interface. Originally based on the public domain |
| 8 | * implementation written by Steve Reid. |
| 9 | * |
| 10 | * s390 Version: |
| 11 | * Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation |
| 12 | * Author(s): Thomas Spatzier (tspat@de.ibm.com) |
| 13 | * |
| 14 | * Derived from "crypto/sha1.c" |
| 15 | * Copyright (c) Alan Smithee. |
| 16 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> |
| 17 | * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> |
| 18 | * |
| 19 | * This program is free software; you can redistribute it and/or modify it |
| 20 | * under the terms of the GNU General Public License as published by the Free |
| 21 | * Software Foundation; either version 2 of the License, or (at your option) |
| 22 | * any later version. |
| 23 | * |
| 24 | */ |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/crypto.h> |
| 29 | #include <asm/scatterlist.h> |
| 30 | #include <asm/byteorder.h> |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 31 | #include "crypt_s390.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #define SHA1_DIGEST_SIZE 20 |
| 34 | #define SHA1_BLOCK_SIZE 64 |
| 35 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 36 | struct crypt_s390_sha1_ctx { |
| 37 | u64 count; |
| 38 | u32 state[5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | u32 buf_len; |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 40 | u8 buffer[2 * SHA1_BLOCK_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | static void |
| 44 | sha1_init(void *ctx) |
| 45 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 46 | static const struct crypt_s390_sha1_ctx initstate = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | .state = { |
| 48 | 0x67452301, |
| 49 | 0xEFCDAB89, |
| 50 | 0x98BADCFE, |
| 51 | 0x10325476, |
| 52 | 0xC3D2E1F0 |
| 53 | }, |
| 54 | }; |
| 55 | memcpy(ctx, &initstate, sizeof(initstate)); |
| 56 | } |
| 57 | |
| 58 | static void |
| 59 | sha1_update(void *ctx, const u8 *data, unsigned int len) |
| 60 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 61 | struct crypt_s390_sha1_ctx *sctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | long imd_len; |
| 63 | |
| 64 | sctx = ctx; |
| 65 | sctx->count += len * 8; //message bit length |
| 66 | |
| 67 | //anything in buffer yet? -> must be completed |
| 68 | if (sctx->buf_len && (sctx->buf_len + len) >= SHA1_BLOCK_SIZE) { |
| 69 | //complete full block and hash |
| 70 | memcpy(sctx->buffer + sctx->buf_len, data, |
| 71 | SHA1_BLOCK_SIZE - sctx->buf_len); |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 72 | crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | SHA1_BLOCK_SIZE); |
| 74 | data += SHA1_BLOCK_SIZE - sctx->buf_len; |
| 75 | len -= SHA1_BLOCK_SIZE - sctx->buf_len; |
| 76 | sctx->buf_len = 0; |
| 77 | } |
| 78 | |
| 79 | //rest of data contains full blocks? |
| 80 | imd_len = len & ~0x3ful; |
| 81 | if (imd_len){ |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 82 | crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, imd_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | data += imd_len; |
| 84 | len -= imd_len; |
| 85 | } |
| 86 | //anything left? store in buffer |
| 87 | if (len){ |
| 88 | memcpy(sctx->buffer + sctx->buf_len , data, len); |
| 89 | sctx->buf_len += len; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | |
| 94 | static void |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 95 | pad_message(struct crypt_s390_sha1_ctx* sctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | int index; |
| 98 | |
| 99 | index = sctx->buf_len; |
| 100 | sctx->buf_len = (sctx->buf_len < 56)? |
| 101 | SHA1_BLOCK_SIZE:2 * SHA1_BLOCK_SIZE; |
| 102 | //start pad with 1 |
| 103 | sctx->buffer[index] = 0x80; |
| 104 | //pad with zeros |
| 105 | index++; |
| 106 | memset(sctx->buffer + index, 0x00, sctx->buf_len - index); |
| 107 | //append length |
| 108 | memcpy(sctx->buffer + sctx->buf_len - 8, &sctx->count, |
| 109 | sizeof sctx->count); |
| 110 | } |
| 111 | |
| 112 | /* Add padding and return the message digest. */ |
| 113 | static void |
| 114 | sha1_final(void* ctx, u8 *out) |
| 115 | { |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 116 | struct crypt_s390_sha1_ctx *sctx = ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | //must perform manual padding |
| 119 | pad_message(sctx); |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 120 | crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | //copy digest to out |
| 122 | memcpy(out, sctx->state, SHA1_DIGEST_SIZE); |
| 123 | /* Wipe context */ |
| 124 | memset(sctx, 0, sizeof *sctx); |
| 125 | } |
| 126 | |
| 127 | static struct crypto_alg alg = { |
| 128 | .cra_name = "sha1", |
| 129 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
| 130 | .cra_blocksize = SHA1_BLOCK_SIZE, |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 131 | .cra_ctxsize = sizeof(struct crypt_s390_sha1_ctx), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | .cra_module = THIS_MODULE, |
| 133 | .cra_list = LIST_HEAD_INIT(alg.cra_list), |
| 134 | .cra_u = { .digest = { |
| 135 | .dia_digestsize = SHA1_DIGEST_SIZE, |
| 136 | .dia_init = sha1_init, |
| 137 | .dia_update = sha1_update, |
| 138 | .dia_final = sha1_final } } |
| 139 | }; |
| 140 | |
| 141 | static int |
| 142 | init(void) |
| 143 | { |
| 144 | int ret = -ENOSYS; |
| 145 | |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 146 | if (crypt_s390_func_available(KIMD_SHA_1)){ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | ret = crypto_register_alg(&alg); |
| 148 | if (ret == 0){ |
Jan Glauber | c1e26e1 | 2006-01-06 00:19:17 -0800 | [diff] [blame^] | 149 | printk(KERN_INFO "crypt_s390: sha1_s390 loaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | } |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static void __exit |
| 156 | fini(void) |
| 157 | { |
| 158 | crypto_unregister_alg(&alg); |
| 159 | } |
| 160 | |
| 161 | module_init(init); |
| 162 | module_exit(fini); |
| 163 | |
| 164 | MODULE_ALIAS("sha1"); |
| 165 | |
| 166 | MODULE_LICENSE("GPL"); |
| 167 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); |