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authorHerbert Xu <herbert@gondor.apana.org.au>2008-09-09 17:23:07 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 11:01:35 +1100
commitfaccc4bba160784e834b758f23d598e500ac7108 (patch)
tree4938c074a79f2d7621ca546db3ad84753a222c95 /crypto
parent5f7082ed4f482f05db01d84dbf58190492ebf0ad (diff)
downloadconfigs-faccc4bba160784e834b758f23d598e500ac7108.tar.gz
crypto: crc32c - Switch to shash
This patch changes crc32c to the new shash interface. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/crc32c.c185
1 files changed, 53 insertions, 132 deletions
diff --git a/crypto/crc32c.c b/crypto/crc32c.c
index a882d9e4e63..b21b93f2bb9 100644
--- a/crypto/crc32c.c
+++ b/crypto/crc32c.c
@@ -25,20 +25,26 @@
#define CHKSUM_DIGEST_SIZE 4
struct chksum_ctx {
- u32 crc;
u32 key;
};
+struct chksum_desc_ctx {
+ u32 crc;
+};
+
/*
* Steps through buffer one byte at at time, calculates reflected
* crc using table.
*/
-static void chksum_init(struct crypto_tfm *tfm)
+static int chksum_init(struct shash_desc *desc)
{
- struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+ struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
+ ctx->crc = mctx->key;
- mctx->crc = mctx->key;
+ return 0;
}
/*
@@ -46,180 +52,95 @@ static void chksum_init(struct crypto_tfm *tfm)
* If your algorithm starts with ~0, then XOR with ~0 before you set
* the seed.
*/
-static int chksum_setkey(struct crypto_tfm *tfm, const u8 *key,
+static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
- struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+ struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
- if (keylen != sizeof(mctx->crc)) {
- tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ if (keylen != sizeof(mctx->key)) {
+ crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
mctx->key = le32_to_cpu(*(__le32 *)key);
return 0;
}
-static void chksum_update(struct crypto_tfm *tfm, const u8 *data,
- unsigned int length)
+static int chksum_update(struct shash_desc *desc, const u8 *data,
+ unsigned int length)
{
- struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
- mctx->crc = crc32c(mctx->crc, data, length);
-}
-
-static void chksum_final(struct crypto_tfm *tfm, u8 *out)
-{
- struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
-
- *(__le32 *)out = ~cpu_to_le32(mctx->crc);
-}
-
-static int crc32c_cra_init_old(struct crypto_tfm *tfm)
-{
- struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
-
- mctx->key = ~0;
+ ctx->crc = crc32c(ctx->crc, data, length);
return 0;
}
-static struct crypto_alg old_alg = {
- .cra_name = "crc32c",
- .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
- .cra_blocksize = CHKSUM_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct chksum_ctx),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(old_alg.cra_list),
- .cra_init = crc32c_cra_init_old,
- .cra_u = {
- .digest = {
- .dia_digestsize= CHKSUM_DIGEST_SIZE,
- .dia_setkey = chksum_setkey,
- .dia_init = chksum_init,
- .dia_update = chksum_update,
- .dia_final = chksum_final
- }
- }
-};
-
-/*
- * Setting the seed allows arbitrary accumulators and flexible XOR policy
- * If your algorithm starts with ~0, then XOR with ~0 before you set
- * the seed.
- */
-static int crc32c_setkey(struct crypto_ahash *hash, const u8 *key,
- unsigned int keylen)
+static int chksum_final(struct shash_desc *desc, u8 *out)
{
- u32 *mctx = crypto_ahash_ctx(hash);
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
- if (keylen != sizeof(u32)) {
- crypto_ahash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- *mctx = le32_to_cpup((__le32 *)key);
+ *(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
return 0;
}
-static int crc32c_init(struct ahash_request *req)
+static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
{
- u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
- u32 *crcp = ahash_request_ctx(req);
-
- *crcp = *mctx;
+ *(__le32 *)out = ~cpu_to_le32(crc32c(*crcp, data, len));
return 0;
}
-static int crc32c_update(struct ahash_request *req)
+static int chksum_finup(struct shash_desc *desc, const u8 *data,
+ unsigned int len, u8 *out)
{
- struct crypto_hash_walk walk;
- u32 *crcp = ahash_request_ctx(req);
- u32 crc = *crcp;
- int nbytes;
-
- for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
- nbytes = crypto_hash_walk_done(&walk, 0))
- crc = crc32c(crc, walk.data, nbytes);
+ struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
- *crcp = crc;
- return 0;
+ return __chksum_finup(&ctx->crc, data, len, out);
}
-static int crc32c_final(struct ahash_request *req)
+static int chksum_digest(struct shash_desc *desc, const u8 *data,
+ unsigned int length, u8 *out)
{
- u32 *crcp = ahash_request_ctx(req);
-
- *(__le32 *)req->result = ~cpu_to_le32p(crcp);
- return 0;
-}
+ struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
-static int crc32c_digest(struct ahash_request *req)
-{
- struct crypto_hash_walk walk;
- u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
- u32 crc = *mctx;
- int nbytes;
-
- for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
- nbytes = crypto_hash_walk_done(&walk, 0))
- crc = crc32c(crc, walk.data, nbytes);
-
- *(__le32 *)req->result = ~cpu_to_le32(crc);
- return 0;
+ return __chksum_finup(&mctx->key, data, length, out);
}
static int crc32c_cra_init(struct crypto_tfm *tfm)
{
- u32 *key = crypto_tfm_ctx(tfm);
-
- *key = ~0;
-
- tfm->crt_ahash.reqsize = sizeof(u32);
+ struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+ mctx->key = ~0;
return 0;
}
-static struct crypto_alg alg = {
- .cra_name = "crc32c",
- .cra_driver_name = "crc32c-generic",
- .cra_priority = 100,
- .cra_flags = CRYPTO_ALG_TYPE_AHASH,
- .cra_blocksize = CHKSUM_BLOCK_SIZE,
- .cra_alignmask = 3,
- .cra_ctxsize = sizeof(u32),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(alg.cra_list),
- .cra_init = crc32c_cra_init,
- .cra_type = &crypto_ahash_type,
- .cra_u = {
- .ahash = {
- .digestsize = CHKSUM_DIGEST_SIZE,
- .setkey = crc32c_setkey,
- .init = crc32c_init,
- .update = crc32c_update,
- .final = crc32c_final,
- .digest = crc32c_digest,
- }
+static struct shash_alg alg = {
+ .digestsize = CHKSUM_DIGEST_SIZE,
+ .setkey = chksum_setkey,
+ .init = chksum_init,
+ .update = chksum_update,
+ .final = chksum_final,
+ .finup = chksum_finup,
+ .digest = chksum_digest,
+ .descsize = sizeof(struct chksum_desc_ctx),
+ .base = {
+ .cra_name = "crc32c",
+ .cra_driver_name = "crc32c-generic",
+ .cra_priority = 100,
+ .cra_blocksize = CHKSUM_BLOCK_SIZE,
+ .cra_alignmask = 3,
+ .cra_ctxsize = sizeof(struct chksum_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = crc32c_cra_init,
}
};
static int __init crc32c_mod_init(void)
{
- int err;
-
- err = crypto_register_alg(&old_alg);
- if (err)
- return err;
-
- err = crypto_register_alg(&alg);
- if (err)
- crypto_unregister_alg(&old_alg);
-
- return err;
+ return crypto_register_shash(&alg);
}
static void __exit crc32c_mod_fini(void)
{
- crypto_unregister_alg(&alg);
- crypto_unregister_alg(&old_alg);
+ crypto_unregister_shash(&alg);
}
module_init(crc32c_mod_init);