1 files changed, 51 insertions, 0 deletions
diff --git a/hmac-sha2.h b/hmac-sha2.h
new file mode 100644
index 0000000..46908d2
--- /dev/null
+++ b/hmac-sha2.h
@@ -0,0 +1,51 @@
+#ifndef HMAC_SHA2_H_
+#define HMAC_SHA2_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <stdint.h> // uint8_t
+#include "sha2.h"
+
+typedef struct {
+  uint8_t key[64];
+  sha256_t ctx;
+} hmac_sha256_t;
+
+void hmac_sha256_init(
+  hmac_sha256_t * const ctx,
+  const uint8_t * const key,
+  const size_t key_len
+);
+
+void hmac_sha256_push(
+  hmac_sha256_t * const ctx,
+  const uint8_t * const buf,
+  const size_t buf_len
+);
+
+void hmac_sha256_fini(
+  hmac_sha256_t * const ctx,
+  uint8_t * const out
+);
+
+void hmac_sha256(
+  const uint8_t * const key,
+  const size_t key_len,
+  const uint8_t * const buf,
+  const size_t buf_len,
+  uint8_t * const out
+);
+
+_Bool hmac_check(
+  const uint8_t * const a,
+  const uint8_t * const b,
+  const size_t len
+);
+
+#ifdef __cplusplus
+};
+#endif /* __cplusplus */
+
+#endif /* HMAC_SHA2_H_ */