arch/s390/crypto/sha1_s390.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Cryptographic API.
   4  *
   5  * s390 implementation of the SHA1 Secure Hash Algorithm.
   6  *
   7  * Derived from cryptoapi implementation, adapted for in-place
   8  * scatterlist interface.  Originally based on the public domain
   9  * implementation written by Steve Reid.
  10  *
  11  * s390 Version:
  12  *   Copyright IBM Corp. 2003, 2007
  13  *   Author(s): Thomas Spatzier
  14  *              Jan Glauber (jan.glauber@de.ibm.com)
  15  *
  16  * Derived from "crypto/sha1_generic.c"
  17  *   Copyright (c) Alan Smithee.
  18  *   Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  19  *   Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  20  */
  21 #include <crypto/internal/hash.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/cpufeature.h>
  25 #include <crypto/sha.h>
  26 #include <asm/cpacf.h>
  27
  28 #include "sha.h"
  29
  30 static int sha1_init(struct shash_desc *desc)
  31 {
  32         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  33
  34         sctx->state[0] = SHA1_H0;
  35         sctx->state[1] = SHA1_H1;
  36         sctx->state[2] = SHA1_H2;
  37         sctx->state[3] = SHA1_H3;
  38         sctx->state[4] = SHA1_H4;
  39         sctx->count = 0;
  40         sctx->func = CPACF_KIMD_SHA_1;
  41
  42         return 0;
  43 }
  44
  45 static int sha1_export(struct shash_desc *desc, void *out)
  46 {
  47         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  48         struct sha1_state *octx = out;
  49
  50         octx->count = sctx->count;
  51         memcpy(octx->state, sctx->state, sizeof(octx->state));
  52         memcpy(octx->buffer, sctx->buf, sizeof(octx->buffer));
  53         return 0;
  54 }
  55
  56 static int sha1_import(struct shash_desc *desc, const void *in)
  57 {
  58         struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
  59         const struct sha1_state *ictx = in;
  60
  61         sctx->count = ictx->count;
  62         memcpy(sctx->state, ictx->state, sizeof(ictx->state));
  63         memcpy(sctx->buf, ictx->buffer, sizeof(ictx->buffer));
  64         sctx->func = CPACF_KIMD_SHA_1;
  65         return 0;
  66 }
  67
  68 static struct shash_alg alg = {
  69         .digestsize     =       SHA1_DIGEST_SIZE,
  70         .init           =       sha1_init,
  71         .update         =       s390_sha_update,
  72         .final          =       s390_sha_final,
  73         .export         =       sha1_export,
  74         .import         =       sha1_import,
  75         .descsize       =       sizeof(struct s390_sha_ctx),
  76         .statesize      =       sizeof(struct sha1_state),
  77         .base           =       {
  78                 .cra_name       =       "sha1",
  79                 .cra_driver_name=       "sha1-s390",
  80                 .cra_priority   =       300,
  81                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
  82                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
  83                 .cra_module     =       THIS_MODULE,
  84         }
  85 };
  86
  87 static int __init sha1_s390_init(void)
  88 {
  89         if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
  90                 return -EOPNOTSUPP;
  91         return crypto_register_shash(&alg);
  92 }
  93
  94 static void __exit sha1_s390_fini(void)
  95 {
  96         crypto_unregister_shash(&alg);
  97 }
  98
  99 module_cpu_feature_match(MSA, sha1_s390_init);
 100 module_exit(sha1_s390_fini);
 101
 102 MODULE_ALIAS_CRYPTO("sha1");
 103 MODULE_LICENSE("GPL");
 104 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");