crypto: api - Export crypto_alg_lookup instead of __crypto_alg_lookup
[linux-2.6.git] / crypto / hmac.c
index 34c3706..7ff2d6a 100644 (file)
@@ -17,6 +17,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -56,14 +57,35 @@ static int hmac_setkey(struct crypto_hash *parent,
        if (keylen > bs) {
                struct hash_desc desc;
                struct scatterlist tmp;
+               int tmplen;
                int err;
 
                desc.tfm = tfm;
                desc.flags = crypto_hash_get_flags(parent);
                desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
-               sg_init_one(&tmp, inkey, keylen);
 
-               err = crypto_hash_digest(&desc, &tmp, keylen, digest);
+               err = crypto_hash_init(&desc);
+               if (err)
+                       return err;
+
+               tmplen = bs * 2 + ds;
+               sg_init_one(&tmp, ipad, tmplen);
+
+               for (; keylen > tmplen; inkey += tmplen, keylen -= tmplen) {
+                       memcpy(ipad, inkey, tmplen);
+                       err = crypto_hash_update(&desc, &tmp, tmplen);
+                       if (err)
+                               return err;
+               }
+
+               if (keylen) {
+                       memcpy(ipad, inkey, keylen);
+                       err = crypto_hash_update(&desc, &tmp, keylen);
+                       if (err)
+                               return err;
+               }
+
+               err = crypto_hash_final(&desc, digest);
                if (err)
                        return err;
 
@@ -160,7 +182,7 @@ static int hmac_digest(struct hash_desc *pdesc, struct scatterlist *sg,
 
        sg_init_table(sg1, 2);
        sg_set_buf(sg1, ipad, bs);
-       sg_chain(sg1, 2, sg);
+       scatterwalk_sg_chain(sg1, 2, sg);
 
        sg_init_table(sg2, 1);
        sg_set_buf(sg2, opad, bs + ds);
@@ -204,6 +226,7 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
        struct crypto_instance *inst;
        struct crypto_alg *alg;
        int err;
+       int ds;
 
        err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH);
        if (err)
@@ -212,7 +235,14 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_HASH,
                                  CRYPTO_ALG_TYPE_HASH_MASK);
        if (IS_ERR(alg))
-               return ERR_PTR(PTR_ERR(alg));
+               return ERR_CAST(alg);
+
+       inst = ERR_PTR(-EINVAL);
+       ds = (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+            CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
+                                   alg->cra_digest.dia_digestsize;
+       if (ds > alg->cra_blocksize)
+               goto out_put_alg;
 
        inst = crypto_alloc_instance("hmac", alg);
        if (IS_ERR(inst))
@@ -224,14 +254,10 @@ static struct crypto_instance *hmac_alloc(struct rtattr **tb)
        inst->alg.cra_alignmask = alg->cra_alignmask;
        inst->alg.cra_type = &crypto_hash_type;
 
-       inst->alg.cra_hash.digestsize =
-               (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
-               CRYPTO_ALG_TYPE_HASH ? alg->cra_hash.digestsize :
-                                      alg->cra_digest.dia_digestsize;
+       inst->alg.cra_hash.digestsize = ds;
 
        inst->alg.cra_ctxsize = sizeof(struct hmac_ctx) +
-                               ALIGN(inst->alg.cra_blocksize * 2 +
-                                     inst->alg.cra_hash.digestsize,
+                               ALIGN(inst->alg.cra_blocksize * 2 + ds,
                                      sizeof(void *));
 
        inst->alg.cra_init = hmac_init_tfm;