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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | /* * Cryptographic API. * * s390 implementation of the SHA256 Secure Hash Algorithm. * * s390 Version: * Copyright IBM Corp. 2005,2007 * Author(s): Jan Glauber (jang@de.ibm.com) * * Derived from "crypto/sha256.c" * and "arch/s390/crypto/sha1_s390.c" * * 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 "crypt_s390.h" #define SHA256_DIGEST_SIZE 32 #define SHA256_BLOCK_SIZE 64 struct s390_sha256_ctx { u64 count; u32 state[8]; u8 buf[2 * SHA256_BLOCK_SIZE]; }; static void sha256_init(struct crypto_tfm *tfm) { struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm); sctx->state[0] = 0x6a09e667; sctx->state[1] = 0xbb67ae85; sctx->state[2] = 0x3c6ef372; sctx->state[3] = 0xa54ff53a; sctx->state[4] = 0x510e527f; sctx->state[5] = 0x9b05688c; sctx->state[6] = 0x1f83d9ab; sctx->state[7] = 0x5be0cd19; sctx->count = 0; } static void sha256_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len) { struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm); unsigned int index; int ret; /* how much is already in the buffer? */ index = sctx->count / 8 & 0x3f; /* update message bit length */ sctx->count += len * 8; if ((index + len) < SHA256_BLOCK_SIZE) goto store; /* process one stored block */ if (index) { memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index); ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf, SHA256_BLOCK_SIZE); BUG_ON(ret != SHA256_BLOCK_SIZE); data += SHA256_BLOCK_SIZE - index; len -= SHA256_BLOCK_SIZE - index; } /* process as many blocks as possible */ if (len >= SHA256_BLOCK_SIZE) { ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, data, len & ~(SHA256_BLOCK_SIZE - 1)); BUG_ON(ret != (len & ~(SHA256_BLOCK_SIZE - 1))); data += ret; len -= ret; } store: /* anything left? */ if (len) memcpy(sctx->buf + index , data, len); } static void pad_message(struct s390_sha256_ctx* sctx) { int index, end; index = sctx->count / 8 & 0x3f; end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_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 */ memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count); sctx->count = end * 8; } /* Add padding and return the message digest */ static void sha256_final(struct crypto_tfm *tfm, u8 *out) { struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm); /* must perform manual padding */ pad_message(sctx); crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf, sctx->count / 8); /* copy digest to out */ memcpy(out, sctx->state, SHA256_DIGEST_SIZE); /* wipe context */ memset(sctx, 0, sizeof *sctx); } static struct crypto_alg alg = { .cra_name = "sha256", .cra_driver_name = "sha256-s390", .cra_priority = CRYPT_S390_PRIORITY, .cra_flags = CRYPTO_ALG_TYPE_DIGEST, .cra_blocksize = SHA256_BLOCK_SIZE, .cra_ctxsize = sizeof(struct s390_sha256_ctx), .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(alg.cra_list), .cra_u = { .digest = { .dia_digestsize = SHA256_DIGEST_SIZE, .dia_init = sha256_init, .dia_update = sha256_update, .dia_final = sha256_final } } }; static int init(void) { if (!crypt_s390_func_available(KIMD_SHA_256)) return -EOPNOTSUPP; return crypto_register_alg(&alg); } static void __exit fini(void) { crypto_unregister_alg(&alg); } module_init(init); module_exit(fini); MODULE_ALIAS("sha256"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm"); |