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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 <libcfs/linux/linux-crypto.h>
35 #include <crypto/internal/hash.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)) {
55 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
62 static int adler32_init(struct shash_desc *desc)
64 u32 *mctx = crypto_shash_ctx(desc->tfm);
65 u32 *cksump = shash_desc_ctx(desc);
72 static int adler32_update(struct shash_desc *desc, const u8 *data,
75 u32 *cksump = shash_desc_ctx(desc);
77 *cksump = zlib_adler32(*cksump, data, len);
80 static int __adler32_finup(u32 *cksump, const u8 *data, unsigned int len,
83 *(u32 *)out = zlib_adler32(*cksump, data, len);
87 static int adler32_finup(struct shash_desc *desc, const u8 *data,
88 unsigned int len, u8 *out)
90 return __adler32_finup(shash_desc_ctx(desc), data, len, out);
93 static int adler32_final(struct shash_desc *desc, u8 *out)
95 u32 *cksump = shash_desc_ctx(desc);
97 *(u32 *)out = *cksump;
101 static int adler32_digest(struct shash_desc *desc, const u8 *data,
102 unsigned int len, u8 *out)
104 return __adler32_finup(crypto_shash_ctx(desc->tfm), data, len,
107 static struct shash_alg alg = {
108 .setkey = adler32_setkey,
109 .init = adler32_init,
110 .update = adler32_update,
111 .final = adler32_final,
112 .finup = adler32_finup,
113 .digest = adler32_digest,
114 .descsize = sizeof(u32),
115 .digestsize = CHKSUM_DIGEST_SIZE,
117 .cra_name = "adler32",
118 .cra_driver_name = "adler32-zlib",
120 .cra_blocksize = CHKSUM_BLOCK_SIZE,
121 .cra_ctxsize = sizeof(u32),
122 .cra_module = THIS_MODULE,
123 .cra_init = adler32_cra_init,
127 int cfs_crypto_adler32_register(void)
129 return crypto_register_shash(&alg);
132 void cfs_crypto_adler32_unregister(void)
134 crypto_unregister_shash(&alg);