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• This module implements the HMAC algorithm as described by .

• functions

  hmac.new(key, msg=None, digestmod='')hmac.digest(key, meg, digest)

• mothods from HMAC object

  HMAC.update(msg) # m.update(a);m.update(b) is equivalent to m.update(a+b)HMAC.digest()HMAC.hexdigest()HMAC.copy()HMAC.digest_sizeHMAC.block_sizeHMAC.compare_digest(a,b)

• Usage Example

  import hmacmessage = b'Hello, world!'key = b'secret'h = hmac.new(key, message, digestmod='MD5') # 如果消息很长，可以多次调用h.update(msg)h.hexdigest()

• References

1. — Secure hashes and message digests