arch/s390/crypto/sha_common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Cryptographic API.
   4  *
   5  * s390 generic implementation of the SHA Secure Hash Algorithms.
   6  *
   7  * Copyright IBM Corp. 2007
   8  * Author(s): Jan Glauber (jang@de.ibm.com)
   9  */
  10
  11 #include <crypto/internal/hash.h>
  12 #include <linux/module.h>
  13 #include <asm/cpacf.h>
  14 #include "sha.h"
  15
  16 int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
  17 {
  18         struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
  19         unsigned int bsize = crypto_shash_blocksize(desc->tfm);
  20         unsigned int index, n;
  21
  22         /* how much is already in the buffer? */
  23         index = ctx->count % bsize;
  24         ctx->count += len;
  25
  26         if ((index + len) < bsize)
  27                 goto store;
  28
  29         /* process one stored block */
  30         if (index) {
  31                 memcpy(ctx->buf + index, data, bsize - index);
  32                 cpacf_kimd(ctx->func, ctx->state, ctx->buf, bsize);
  33                 data += bsize - index;
  34                 len -= bsize - index;
  35                 index = 0;
  36         }
  37
  38         /* process as many blocks as possible */
  39         if (len >= bsize) {
  40                 n = (len / bsize) * bsize;
  41                 cpacf_kimd(ctx->func, ctx->state, data, n);
  42                 data += n;
  43                 len -= n;
  44         }
  45 store:
  46         if (len)
  47                 memcpy(ctx->buf + index , data, len);
  48
  49         return 0;
  50 }
  51 EXPORT_SYMBOL_GPL(s390_sha_update);
  52
  53 static int s390_crypto_shash_parmsize(int func)
  54 {
  55         switch (func) {
  56         case CPACF_KLMD_SHA_1:
  57                 return 20;
  58         case CPACF_KLMD_SHA_256:
  59                 return 32;
  60         case CPACF_KLMD_SHA_512:
  61                 return 64;
  62         case CPACF_KLMD_SHA3_224:
  63         case CPACF_KLMD_SHA3_256:
  64         case CPACF_KLMD_SHA3_384:
  65         case CPACF_KLMD_SHA3_512:
  66                 return 200;
  67         default:
  68                 return -EINVAL;
  69         }
  70 }
  71
  72 int s390_sha_final(struct shash_desc *desc, u8 *out)
  73 {
  74         struct s390_sha_ctx *ctx = shash_desc_ctx(desc);
  75         unsigned int bsize = crypto_shash_blocksize(desc->tfm);
  76         u64 bits;
  77         unsigned int n;
  78         int mbl_offset;
  79
  80         n = ctx->count % bsize;
  81         bits = ctx->count * 8;
  82         mbl_offset = s390_crypto_shash_parmsize(ctx->func);
  83         if (mbl_offset < 0)
  84                 return -EINVAL;
  85
  86         mbl_offset = mbl_offset / sizeof(u32);
  87
  88         /* set total msg bit length (mbl) in CPACF parmblock */
  89         switch (ctx->func) {
  90         case CPACF_KLMD_SHA_1:
  91         case CPACF_KLMD_SHA_256:
  92                 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
  93                 break;
  94         case CPACF_KLMD_SHA_512:
  95                 /*
  96                  * the SHA512 parmblock has a 128-bit mbl field, clear
  97                  * high-order u64 field, copy bits to low-order u64 field
  98                  */
  99                 memset(ctx->state + mbl_offset, 0x00, sizeof(bits));
 100                 mbl_offset += sizeof(u64) / sizeof(u32);
 101                 memcpy(ctx->state + mbl_offset, &bits, sizeof(bits));
 102                 break;
 103         case CPACF_KLMD_SHA3_224:
 104         case CPACF_KLMD_SHA3_256:
 105         case CPACF_KLMD_SHA3_384:
 106         case CPACF_KLMD_SHA3_512:
 107                 break;
 108         default:
 109                 return -EINVAL;
 110         }
 111
 112         cpacf_klmd(ctx->func, ctx->state, ctx->buf, n);
 113
 114         /* copy digest to out */
 115         memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));
 116         /* wipe context */
 117         memset(ctx, 0, sizeof *ctx);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL_GPL(s390_sha_final);
 122
 123 MODULE_LICENSE("GPL");
 124 MODULE_DESCRIPTION("s390 SHA cipher common functions");