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HMAC 
 
 
 
cryptographic message authentication. 
 
 
 
 
HMAC is a cryptographic mechanism for message authentication described 
in RFC2104.  It allows a sender and receiver with a shared 
cryptographic key to verify the authenticity of a message. 
 
 
 
 
 
 
RFC2104 - HMAC: Keyed-Hashing for Message Authentication 
 
 
 
 
 
 
 
 
@data:  
@data_len:  
@key:  
@key_len:  
@digest: