- struct scatterlist tmp;
-
- tmp.page = virt_to_page(key);
- tmp.offset = offset_in_page(key);
- tmp.length = keylen;
- crypto_digest_digest(tfm, &tmp, 1, key);
-
+ return (void *)ALIGN((unsigned long)p, align);
+}
+
+static inline struct hmac_ctx *hmac_ctx(struct crypto_hash *tfm)
+{
+ return align_ptr(crypto_hash_ctx_aligned(tfm) +
+ crypto_hash_blocksize(tfm) * 2 +
+ crypto_hash_digestsize(tfm), sizeof(void *));
+}
+
+static int hmac_setkey(struct crypto_hash *parent,
+ const u8 *inkey, unsigned int keylen)
+{
+ int bs = crypto_hash_blocksize(parent);
+ int ds = crypto_hash_digestsize(parent);
+ char *ipad = crypto_hash_ctx_aligned(parent);
+ char *opad = ipad + bs;
+ char *digest = opad + bs;
+ struct hmac_ctx *ctx = align_ptr(digest + ds, sizeof(void *));
+ struct crypto_hash *tfm = ctx->child;
+ unsigned int i;
+
+ if (keylen > bs) {
+ struct hash_desc desc;
+ struct scatterlist tmp;
+ int err;
+
+ desc.tfm = tfm;
+ desc.flags = crypto_hash_get_flags(parent);
+ desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
+ sg_set_buf(&tmp, inkey, keylen);
+
+ err = crypto_hash_digest(&desc, &tmp, keylen, digest);
+ if (err)
+ return err;
+
+ inkey = digest;
+ keylen = ds;
+ }
+
+ memcpy(ipad, inkey, keylen);
+ memset(ipad + keylen, 0, bs - keylen);
+ memcpy(opad, ipad, bs);
+
+ for (i = 0; i < bs; i++) {
+ ipad[i] ^= 0x36;
+ opad[i] ^= 0x5c;
+ }
+
+ return 0;