arch/s390/crypto/sha1_s390.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * s390 implementation of the SHA1 Secure Hash Algorithm.
   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 IBM Corp. 2003, 2007
  12  *   Author(s): Thomas Spatzier
  13  *              Jan Glauber (jan.glauber@de.ibm.com)
  14  *
  15  * Derived from "crypto/sha1_generic.c"
  16  *   Copyright (c) Alan Smithee.
  17  *   Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  18  *   Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  19  *
  20  * This program is free software; you can redistribute it and/or modify it
  21  * under the terms of the GNU General Public License as published by the Free
  22  * Software Foundation; either version 2 of the License, or (at your option)
  23  * any later version.
  24  *
  25  */
  26 #include <crypto/internal/hash.h>
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/cpufeature.h>
  30 #include <crypto/sha.h>
  31 #include <asm/cpacf.h>
  32
  33 #include "sha.h"
  34
  35 static int sha1_init(struct shash_desc *desc)
  36 {
  37         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  38
  39         sctx->state[0] = SHA1_H0;
  40         sctx->state[1] = SHA1_H1;
  41         sctx->state[2] = SHA1_H2;
  42         sctx->state[3] = SHA1_H3;
  43         sctx->state[4] = SHA1_H4;
  44         sctx->count = 0;
  45         sctx->func = CPACF_KIMD_SHA_1;
  46
  47         return 0;
  48 }
  49
  50 static int sha1_export(struct shash_desc *desc, void *out)
  51 {
  52         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  53         struct sha1_state *octx = out;
  54
  55         octx->count = sctx->count;
  56         memcpy(octx->state, sctx->state, sizeof(octx->state));
  57         memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
  58         return 0;
  59 }
  60
  61 static int sha1_import(struct shash_desc *desc, const void *in)
  62 {
  63         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  64         const struct sha1_state *ictx = in;
  65
  66         sctx->count = ictx->count;
  67         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  68         memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));
  69         sctx->func = CPACF_KIMD_SHA_1;
  70         return 0;
  71 }
  72
  73 static struct shash_alg alg = {
  74         .digestsize     =       SHA1_DIGEST_SIZE,
  75         .init           =       sha1_init,
  76         .update         =       s390_sha_update,
  77         .final          =       s390_sha_final,
  78         .export         =       sha1_export,
  79         .import         =       sha1_import,
  80         .descsize       =       sizeof(struct s390_sha_ctx),
  81         .statesize      =       sizeof(struct sha1_state),
  82         .base           =       {
  83                 .cra_name       =       "sha1",
  84                 .cra_driver_name=       "sha1-s390",
  85                 .cra_priority   =       300,
  86                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  87                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
  88                 .cra_module     =       THIS_MODULE,
  89         }
  90 };
  91
  92 static int __init sha1_s390_init(void)
  93 {
  94         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
  95                 return -EOPNOTSUPP;
  96         return crypto_register_shash(&alg);
  97 }
  98
  99 static void __exit sha1_s390_fini(void)
 100 {
 101         crypto_unregister_shash(&alg);
 102 }
 103
 104 module_cpu_feature_match(MSA, sha1_s390_init);
 105 module_exit(sha1_s390_fini);
 106
 107 MODULE_ALIAS_CRYPTO("sha1");
 108 MODULE_LICENSE("GPL");
 109 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");