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25 * Copyright 2012 Xyratex Technology Limited
29 * This is crypto api shash wrappers to zlib_adler32.
32 #include <linux/module.h>
33 #include <linux/zutil.h>
34 #include <crypto/internal/hash.h>
35 #include "linux-crypto.h"
37 #define CHKSUM_BLOCK_SIZE 1
38 #define CHKSUM_DIGEST_SIZE 4
40 static int adler32_cra_init(struct crypto_tfm *tfm)
42 u32 *key = crypto_tfm_ctx(tfm);
49 static int adler32_setkey(struct crypto_shash *hash, const u8 *key,
52 u32 *mctx = crypto_shash_ctx(hash);
54 if (keylen != sizeof(u32))
61 static int adler32_init(struct shash_desc *desc)
63 u32 *mctx = crypto_shash_ctx(desc->tfm);
64 u32 *cksump = shash_desc_ctx(desc);
71 static int adler32_update(struct shash_desc *desc, const u8 *data,
74 u32 *cksump = shash_desc_ctx(desc);
76 *cksump = zlib_adler32(*cksump, data, len);
79 static int __adler32_finup(u32 *cksump, const u8 *data, unsigned int len,
82 *(u32 *)out = zlib_adler32(*cksump, data, len);
86 static int adler32_finup(struct shash_desc *desc, const u8 *data,
87 unsigned int len, u8 *out)
89 return __adler32_finup(shash_desc_ctx(desc), data, len, out);
92 static int adler32_final(struct shash_desc *desc, u8 *out)
94 u32 *cksump = shash_desc_ctx(desc);
96 *(u32 *)out = *cksump;
100 static int adler32_digest(struct shash_desc *desc, const u8 *data,
101 unsigned int len, u8 *out)
103 return __adler32_finup(crypto_shash_ctx(desc->tfm), data, len,
106 static struct shash_alg alg = {
107 .setkey = adler32_setkey,
108 .init = adler32_init,
109 .update = adler32_update,
110 .final = adler32_final,
111 .finup = adler32_finup,
112 .digest = adler32_digest,
113 .descsize = sizeof(u32),
114 .digestsize = CHKSUM_DIGEST_SIZE,
116 .cra_name = "adler32",
117 .cra_driver_name = "adler32-zlib",
119 #ifdef CRYPTO_ALG_OPTIONAL_KEY
120 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
122 .cra_blocksize = CHKSUM_BLOCK_SIZE,
123 .cra_ctxsize = sizeof(u32),
125 .cra_init = adler32_cra_init,
129 int cfs_crypto_adler32_register(void)
131 return crypto_register_shash(&alg);
134 void cfs_crypto_adler32_unregister(void)
136 crypto_unregister_shash(&alg);