1 /* 2 * Cryptographic API. 3 * 4 * s390 implementation of the SHA256 Secure Hash Algorithm. 5 * 6 * s390 Version: 7 * Copyright IBM Corp. 2005,2007 8 * Author(s): Jan Glauber (jang@de.ibm.com) 9 * 10 * Derived from "crypto/sha256_generic.c" 11 * and "arch/s390/crypto/sha1_s390.c" 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the Free 15 * Software Foundation; either version 2 of the License, or (at your option) 16 * any later version. 17 * 18 */ 19 #include <crypto/internal/hash.h> 20 #include <linux/init.h> 21 #include <linux/module.h> 22 #include <crypto/sha.h> 23 24 #include "crypt_s390.h" 25 #include "sha.h" 26 27 static int sha256_init(struct shash_desc *desc) 28 { 29 struct s390_sha_ctx *sctx = shash_desc_ctx(desc); 30 31 sctx->state[0] = SHA256_H0; 32 sctx->state[1] = SHA256_H1; 33 sctx->state[2] = SHA256_H2; 34 sctx->state[3] = SHA256_H3; 35 sctx->state[4] = SHA256_H4; 36 sctx->state[5] = SHA256_H5; 37 sctx->state[6] = SHA256_H6; 38 sctx->state[7] = SHA256_H7; 39 sctx->count = 0; 40 sctx->func = KIMD_SHA_256; 41 42 return 0; 43 } 44 45 static int sha256_export(struct shash_desc *desc, void *out) 46 { 47 struct s390_sha_ctx *sctx = shash_desc_ctx(desc); 48 struct sha256_state *octx = out; 49 50 octx->count = sctx->count; 51 memcpy(octx->state, sctx->state, sizeof(octx->state)); 52 memcpy(octx->buf, sctx->buf, sizeof(octx->buf)); 53 return 0; 54 } 55 56 static int sha256_import(struct shash_desc *desc, const void *in) 57 { 58 struct s390_sha_ctx *sctx = shash_desc_ctx(desc); 59 const struct sha256_state *ictx = in; 60 61 sctx->count = ictx->count; 62 memcpy(sctx->state, ictx->state, sizeof(ictx->state)); 63 memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf)); 64 sctx->func = KIMD_SHA_256; 65 return 0; 66 } 67 68 static struct shash_alg alg = { 69 .digestsize = SHA256_DIGEST_SIZE, 70 .init = sha256_init, 71 .update = s390_sha_update, 72 .final = s390_sha_final, 73 .export = sha256_export, 74 .import = sha256_import, 75 .descsize = sizeof(struct s390_sha_ctx), 76 .statesize = sizeof(struct sha256_state), 77 .base = { 78 .cra_name = "sha256", 79 .cra_driver_name= "sha256-s390", 80 .cra_priority = CRYPT_S390_PRIORITY, 81 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 82 .cra_blocksize = SHA256_BLOCK_SIZE, 83 .cra_module = THIS_MODULE, 84 } 85 }; 86 87 static int sha256_s390_init(void) 88 { 89 if (!crypt_s390_func_available(KIMD_SHA_256, CRYPT_S390_MSA)) 90 return -EOPNOTSUPP; 91 92 return crypto_register_shash(&alg); 93 } 94 95 static void __exit sha256_s390_fini(void) 96 { 97 crypto_unregister_shash(&alg); 98 } 99 100 module_init(sha256_s390_init); 101 module_exit(sha256_s390_fini); 102 103 MODULE_ALIAS("sha256"); 104 MODULE_LICENSE("GPL"); 105 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm"); 106