SweetHMAC是个极小，简单易用的Swift类，使用HMAC算法加密字符串。
字符串扩展：
// Will output this string: e470f785afb708cd8c2a31860642fd11"I'm going to make him an offer he can't refuse".HMAC(.MD5, secret:"Vito Corleone")HMAC：
let quote = "I'm going to make him an offer he can't refuse"let author = "Vito Corleone"// Create a SweetHMAC instance with your message and secret stringslet hmacEncrypt:SweetHMAC = SweetHMAC(source: quote, secret: author)// Pick some computed HMAC output based on some algorithm using "HMAC" method...let md5 = hmacEncrypt.HMAC(.MD5)// ...or do it more "Sweet" like thislet md5 = SweetHMAC(source: quote, secret: author).HMAC(.MD5)
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