crypto: crc32c - Switch to shash
Herbert Xu [Tue, 9 Sep 2008 07:23:07 +0000 (17:23 +1000)]
This patch changes crc32c to the new shash interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/crc32c.c

index a882d9e..b21b93f 100644 (file)
 #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);