Add libhv and test http client

vendor/libhv/include/hv/sha1.h

@@ -0,0 +1,55 @@
+#ifndef HV_SHA1_H_
+#define HV_SHA1_H_
+
+/*
+   SHA-1 in C
+   By Steve Reid <steve@edmweb.com>
+   100% Public Domain
+ */
+
+/* for uint32_t */
+#include <stdint.h>
+
+#include "hexport.h"
+
+typedef struct {
+    uint32_t state[5];
+    uint32_t count[2];
+    unsigned char buffer[64];
+} HV_SHA1_CTX;
+
+BEGIN_EXTERN_C
+
+HV_EXPORT void HV_SHA1Transform(
+    uint32_t state[5],
+    const unsigned char buffer[64]
+    );
+
+HV_EXPORT void HV_SHA1Init(
+    HV_SHA1_CTX * context
+    );
+
+HV_EXPORT void HV_SHA1Update(
+    HV_SHA1_CTX * context,
+    const unsigned char *data,
+    uint32_t len
+    );
+
+HV_EXPORT void HV_SHA1Final(
+    unsigned char digest[20],
+    HV_SHA1_CTX * context
+    );
+
+HV_EXPORT void HV_SHA1(
+    char *hash_out,
+    const char *str,
+    uint32_t len);
+
+HV_EXPORT void hv_sha1(unsigned char* input, uint32_t inputlen, unsigned char digest[20]);
+
+// NOTE: if outputlen > 40: output[40] = '\0'
+HV_EXPORT void hv_sha1_hex(unsigned char* input, uint32_t inputlen, char* output, uint32_t outputlen);
+
+END_EXTERN_C
+
+#endif // HV_SHA1_H_