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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | /* * Cryptographic API. * * s390 implementation of the SHA1 Secure Hash Algorithm. * * Derived from cryptoapi implementation, adapted for in-place * scatterlist interface. Originally based on the public domain * implementation written by Steve Reid. * * s390 Version: * Copyright IBM Corp. 2003,2007 * Author(s): Thomas Spatzier * Jan Glauber (jan.glauber@de.ibm.com) * * Derived from "crypto/sha1_generic.c" * Copyright (c) Alan Smithee. * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <linux/init.h> #include <linux/module.h> #include <linux/crypto.h> #include <crypto/sha.h> #include "crypt_s390.h" struct s390_sha1_ctx { u64 count; /* message length */ u32 state[5]; u8 buf[2 * SHA1_BLOCK_SIZE]; }; static void sha1_init(struct crypto_tfm *tfm) { struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm); sctx->state[0] = SHA1_H0; sctx->state[1] = SHA1_H1; sctx->state[2] = SHA1_H2; sctx->state[3] = SHA1_H3; sctx->state[4] = SHA1_H4; sctx->count = 0; } static void sha1_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len) { struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm); unsigned int index; int ret; /* how much is already in the buffer? */ index = sctx->count & 0x3f; sctx->count += len; if (index + len < SHA1_BLOCK_SIZE) goto store; /* process one stored block */ if (index) { memcpy(sctx->buf + index, data, SHA1_BLOCK_SIZE - index); ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, SHA1_BLOCK_SIZE); BUG_ON(ret != SHA1_BLOCK_SIZE); data += SHA1_BLOCK_SIZE - index; len -= SHA1_BLOCK_SIZE - index; } /* process as many blocks as possible */ if (len >= SHA1_BLOCK_SIZE) { ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, len & ~(SHA1_BLOCK_SIZE - 1)); BUG_ON(ret != (len & ~(SHA1_BLOCK_SIZE - 1))); data += ret; len -= ret; } store: /* anything left? */ if (len) memcpy(sctx->buf + index , data, len); } /* Add padding and return the message digest. */ static void sha1_final(struct crypto_tfm *tfm, u8 *out) { struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm); u64 bits; unsigned int index, end; int ret; /* must perform manual padding */ index = sctx->count & 0x3f; end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE); /* start pad with 1 */ sctx->buf[index] = 0x80; /* pad with zeros */ index++; memset(sctx->buf + index, 0x00, end - index - 8); /* append message length */ bits = sctx->count * 8; memcpy(sctx->buf + end - 8, &bits, sizeof(bits)); ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, end); BUG_ON(ret != end); /* copy digest to out */ memcpy(out, sctx->state, SHA1_DIGEST_SIZE); /* wipe context */ memset(sctx, 0, sizeof *sctx); } static struct crypto_alg alg = { .cra_name = "sha1", .cra_driver_name= "sha1-s390", .cra_priority = CRYPT_S390_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_DIGEST, .cra_blocksize = SHA1_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_sha1_ctx), .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(alg.cra_list), .cra_u = { .digest = { .dia_digestsize = SHA1_DIGEST_SIZE, .dia_init = sha1_init, .dia_update = sha1_update, .dia_final = sha1_final } } }; static int __init init(void) { if (!crypt_s390_func_available(KIMD_SHA_1)) return -EOPNOTSUPP; return crypto_register_alg(&alg); } static void __exit fini(void) { crypto_unregister_alg(&alg); } module_init(init); module_exit(fini); MODULE_ALIAS("sha1"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); |