Encapsulation of practical methods introduced by webrtc native M96 basic base module (MD5, Base64, time, random number)

rtc_base message_digest

Implements many types of message summarization algorithms ,DIGEST_MD5、DIGEST_SHA_1、DIGEST_SHA_224、DIGEST_SHA_256、DIGEST_SHA_384、DIGEST_SHA_512[];
MD5:
MD5 Information digest algorithm （ English ：MD5 Message-Digest Algorithm）, A widely used cryptographic hash function , I can produce one 128 position （16 byte ） Hash value （hash value）, Used to ensure complete and consistent transmission of information .

inline std::string MD5(const std::string& input) {
  return ComputeDigest(DIGEST_MD5, input);
}

std::string HA1 = MD5(sensitive);
ExplicitZeroMemory(sensitive, len);
delete[] sensitive;
std::string HA2 = MD5(A2);
std::string dig_response = MD5(HA1 + ":" + middle + ":" + HA2);

HMAC Is the key related hash operation message authentication code （Hash-based Message Authentication Code） Abbreviation
Use ：

  size_t ret = rtc::ComputeHmac(rtc::DIGEST_SHA_1, key, keylen, buf.Data(),
                                msg_len_for_hmac