4 * s390 generic implementation of the SHA Secure Hash Algorithms.
6 * Copyright IBM Corp. 2007
7 * Author(s): Jan Glauber (jang@de.ibm.com)
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
16 #include <crypto/internal/hash.h>
18 #include "crypt_s390.h"
20 int s390_sha_update(struct shash_desc
*desc
, const u8
*data
, unsigned int len
)
22 struct s390_sha_ctx
*ctx
= shash_desc_ctx(desc
);
23 unsigned int bsize
= crypto_shash_blocksize(desc
->tfm
);
27 /* how much is already in the buffer? */
28 index
= ctx
->count
& (bsize
- 1);
31 if ((index
+ len
) < bsize
)
34 /* process one stored block */
36 memcpy(ctx
->buf
+ index
, data
, bsize
- index
);
37 ret
= crypt_s390_kimd(ctx
->func
, ctx
->state
, ctx
->buf
, bsize
);
39 data
+= bsize
- index
;
43 /* process as many blocks as possible */
45 ret
= crypt_s390_kimd(ctx
->func
, ctx
->state
, data
,
47 BUG_ON(ret
!= (len
& ~(bsize
- 1)));
53 memcpy(ctx
->buf
+ index
, data
, len
);
57 EXPORT_SYMBOL_GPL(s390_sha_update
);
59 int s390_sha_final(struct shash_desc
*desc
, u8
*out
)
61 struct s390_sha_ctx
*ctx
= shash_desc_ctx(desc
);
62 unsigned int bsize
= crypto_shash_blocksize(desc
->tfm
);
64 unsigned int index
, end
, plen
;
67 /* SHA-512 uses 128 bit padding length */
68 plen
= (bsize
> SHA256_BLOCK_SIZE
) ? 16 : 8;
70 /* must perform manual padding */
71 index
= ctx
->count
& (bsize
- 1);
72 end
= (index
< bsize
- plen
) ? bsize
: (2 * bsize
);
74 /* start pad with 1 */
75 ctx
->buf
[index
] = 0x80;
79 memset(ctx
->buf
+ index
, 0x00, end
- index
- 8);
82 * Append message length. Well, SHA-512 wants a 128 bit lenght value,
83 * nevertheless we use u64, should be enough for now...
85 bits
= ctx
->count
* 8;
86 memcpy(ctx
->buf
+ end
- 8, &bits
, sizeof(bits
));
88 ret
= crypt_s390_kimd(ctx
->func
, ctx
->state
, ctx
->buf
, end
);
91 /* copy digest to out */
92 memcpy(out
, ctx
->state
, crypto_shash_digestsize(desc
->tfm
));
94 memset(ctx
, 0, sizeof *ctx
);
98 EXPORT_SYMBOL_GPL(s390_sha_final
);
100 MODULE_LICENSE("GPL");
101 MODULE_DESCRIPTION("s390 SHA cipher common functions");
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