diff --git a/hash.h b/hash.h
index 8c5a514..16989fc 100644
--- a/hash.h
+++ b/hash.h
@@ -26,6 +26,9 @@ struct lc_hash_impl {
 
 	void	*(*ctx_new)(void);
 	void	 (*ctx_free)(void *);
+
+	size_t	   blocklen;
+	size_t	   hashlen;
 };
 
 struct lc_hash_ctx {
diff --git a/hash_sha224_sha256.c b/hash_sha224_sha256.c
index 6444564..ea7760d 100644
--- a/hash_sha224_sha256.c
+++ b/hash_sha224_sha256.c
@@ -266,6 +266,9 @@ static struct lc_hash_impl	sha224_impl = {
 
 	.ctx_new = &sha224_sha256_ctx_new,
 	.ctx_free = NULL,
+
+	.blocklen = LC_SHA224_BLOCKLEN,
+	.hashlen = LC_SHA224_HASHLEN,
 };
 
 static struct lc_hash_impl	sha256_impl = {
@@ -276,6 +279,9 @@ static struct lc_hash_impl	sha256_impl = {
 
 	.ctx_new = &sha224_sha256_ctx_new,
 	.ctx_free = NULL,
+
+	.blocklen = LC_SHA256_BLOCKLEN,
+	.hashlen = LC_SHA256_HASHLEN,
 };
 
 const struct lc_hash_impl *
diff --git a/hash_sha384_sha512.c b/hash_sha384_sha512.c
index 54a9921..f63f657 100644
--- a/hash_sha384_sha512.c
+++ b/hash_sha384_sha512.c
@@ -271,6 +271,9 @@ static struct lc_hash_impl	sha384_impl = {
 
 	.ctx_new = &sha384_sha512_ctx_new,
 	.ctx_free = NULL,
+
+	.blocklen = LC_SHA384_BLOCKLEN,
+	.hashlen = LC_SHA384_HASHLEN,
 };
 
 static struct lc_hash_impl	sha512_impl = {
@@ -281,6 +284,9 @@ static struct lc_hash_impl	sha512_impl = {
 
 	.ctx_new = &sha384_sha512_ctx_new,
 	.ctx_free = NULL,
+
+	.blocklen = LC_SHA512_BLOCKLEN,
+	.hashlen = LC_SHA512_HASHLEN,
 };
 
 const struct lc_hash_impl *