diff --git a/include/libantelope/hash.hpp b/include/libantelope/hash.hpp
index 4ad57d7..67dd698 100644
--- a/include/libantelope/hash.hpp
+++ b/include/libantelope/hash.hpp
@@ -25,6 +25,7 @@
 #define LIBANTELOPE_HASH_H
 
 #include <cstddef>
+#include <libantelope/internal/hash.hpp>
 
 namespace libantelope {
 
@@ -34,6 +35,26 @@ namespace libantelope {
 typedef unsigned char ripemd160_t[20];
 typedef unsigned char sha256_t[32];
 
+typedef internal::sha256_state sha256_ctx_t;
+typedef internal::ripemd160_state ripemd160_ctx_t;
+
+/**
+ * Initialize a sha256_ctx_t structure
+ */
+int sha256_init(sha256_ctx_t* ctx);
+
+/**
+ * Update the sha256 hash value with the contents in `data` up to `len` bytes.
+ * This can be called repeatedly to hash chunks of data.
+ */
+int sha256_update(sha256_ctx_t* ctx, const void *data, std::size_t len);
+
+/**
+ * Place the message digest in out variable.
+ * The ctx's internal state is reset after this operation.
+ */
+int sha256_final(sha256_ctx_t* ctx, sha256_t* out);
+
 /**
  * sha256 hashing function.
  * Hashes the content in `data` up to `len` bytes. The result is stored in `out`.
@@ -48,6 +69,23 @@ sha256_t* sha256(const unsigned char *data, std::size_t len, sha256_t* out);
  */
 sha256_t* sha256d(const unsigned char *data, std::size_t len, sha256_t* out);
 
+/**
+ * Initialize a ripmemd160_ctx_t structure
+ */
+int ripemd160_init(ripemd160_ctx_t* ctx);
+
+/**
+ * Update the RipeMD160 hash value with the contents in `data` up to `len` bytes.
+ * This can be called repeatedly to hash chunks of data.
+ */
+int ripemd160_update(ripemd160_ctx_t* ctx, const void *data, std::size_t len);
+
+/**
+ * Places the RipeMD160 message digest in out variable.
+ * The ctx's internal state is reset after this operation.
+ */
+int ripemd160_final(ripemd160_ctx_t* ctx, ripemd160_t* out);
+
 /**
  * RipeMD160 hashing function.
  * Hashes the content in `data` up to `len` bytes. The result is stored in `out`.
diff --git a/src/openssl/hash.cpp b/src/openssl/hash.cpp
index 492e23a..1fa07b3 100644
--- a/src/openssl/hash.cpp
+++ b/src/openssl/hash.cpp
@@ -27,6 +27,18 @@
 
 namespace libantelope {
 
+int sha256_init(struct sha256_ctx* ctx) {
+	return SHA256_Init((SHA256_CTX*)ctx);
+}
+
+int sha256_update(sha256_ctx_t* ctx, const void *data, std::size_t len) {
+	return SHA256_Update((SHA256_CTX*)ctx, data, len);
+}
+
+int sha256_final(sha256_ctx_t* ctx, sha256_t* out) {
+	return SHA256_Final((unsigned char*) out, (SHA256_CTX*)ctx);
+}
+
 sha256_t* sha256(const unsigned char *data, std::size_t len, sha256_t* out) {
 	return (sha256_t *) SHA256(data, len, (unsigned char*) out);
 }
@@ -36,6 +48,18 @@ sha256_t* sha256d(const unsigned char *data, std::size_t len, sha256_t* out) {
 	return (sha256_t *) SHA256((unsigned char*) out, 32, (unsigned char*) out);
 }
 
+int ripemd160_init(ripemd160_ctx_t* ctx) {
+	return RIPEMD160_Init((RIPEMD160_CTX*)ctx);
+}
+
+int ripemd160_update(ripemd160_ctx_t* ctx, const void *data, std::size_t len) {
+	return RIPEMD160_Update((RIPEMD160_CTX*)ctx, data, len);
+}
+
+int ripemd160_final(ripemd160_ctx_t* ctx, ripemd160_t* out) {
+	return RIPEMD160_Final((unsigned char*) out, (RIPEMD160_CTX*)ctx);
+}
+
 ripemd160_t* ripemd160(const unsigned char *data, std::size_t len, ripemd160_t* out) {
 	return (ripemd160_t *) RIPEMD160(data, len, (unsigned char*) out);
 }