diff --git a/include/crypto.h b/include/crypto.h
index d93cbad..f2a1f14 100644
--- a/include/crypto.h
+++ b/include/crypto.h
@@ -23,6 +23,11 @@ enum crypto_hash_type {
 	CRYPTO_HASH_SHA1,
 };
 
+struct crypto_data_entry {
+	uint8_t* data;
+	size_t len;
+};
+
 void crypto_dump_base16(const char* msg, const uint8_t* bytes, size_t len);
 void crypto_dump_base64(const char* msg, const uint8_t* bytes, size_t len);
 
@@ -73,6 +78,11 @@ void crypto_hash_append(struct crypto_hash* self, const uint8_t* src,
 void crypto_hash_digest(struct crypto_hash* self, uint8_t* dst,
 		size_t len);
 
+void crypto_hash_one(uint8_t* dst, size_t dst_len, enum crypto_hash_type type,
+		const uint8_t* src, size_t src_len);
+void crypto_hash_many(uint8_t* dst, size_t dst_len, enum crypto_hash_type type,
+		const struct crypto_data_entry *src);
+
 // RSA
 struct crypto_rsa_pub_key* crypto_rsa_pub_key_new(void);
 void crypto_rsa_pub_key_del(struct crypto_rsa_pub_key*);
diff --git a/src/crypto-nettle.c b/src/crypto-nettle.c
index db04241..ea34637 100644
--- a/src/crypto-nettle.c
+++ b/src/crypto-nettle.c
@@ -471,6 +471,25 @@ void crypto_hash_digest(struct crypto_hash* self, uint8_t* dst, size_t len)
 	self->digest(&self->ctx, len, dst);
 }
 
+void crypto_hash_one(uint8_t* dst, size_t dst_len, enum crypto_hash_type type,
+		const uint8_t* src, size_t src_len)
+{
+	struct crypto_hash *hash = crypto_hash_new(type);
+	crypto_hash_append(hash, src, src_len);
+	crypto_hash_digest(hash, dst, dst_len);
+	crypto_hash_del(hash);
+}
+
+void crypto_hash_many(uint8_t* dst, size_t dst_len, enum crypto_hash_type type,
+		const struct crypto_data_entry *src)
+{
+	struct crypto_hash *hash = crypto_hash_new(type);
+	for (int i = 0; src[i].data && src[i].len; ++i)
+		crypto_hash_append(hash, src[i].data, src[i].len);
+	crypto_hash_digest(hash, dst, dst_len);
+	crypto_hash_del(hash);
+}
+
 struct crypto_rsa_pub_key *crypto_rsa_pub_key_new(void)
 {
 	struct crypto_rsa_pub_key* self = calloc(1, sizeof(*self));