7.0 refactor

src/sha1.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "arch.h"
+
+typedef struct {
+  uint32_t state[5];
+  uint32_t count[2];
+  unsigned char buffer[64];
+} mg_sha1_ctx;
+
+void mg_sha1_init(mg_sha1_ctx *);
+void mg_sha1_update(mg_sha1_ctx *, const unsigned char *data, size_t len);
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *);
+void mg_hmac_sha1(const unsigned char *key, size_t key_len,
+                  const unsigned char *text, size_t text_len,
+                  unsigned char out[20]);