ios - Generate a HMAC swift sdk8.3 using CCHmac() -

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before sdk8.3 generating hmac way. error on cchmac() function. since i'm beginner can't figure out how fix it. in advance help!

xcode warning: cannot involke 'cchmac' argument list of type (uint32, [cchar]?, uint, [cchar]?, uint, inout[(cunsignedchar)]

func generatehmac(key: string, data: string) -> string {      let ckey = key.cstringusingencoding(nsutf8stringencoding)     let cdata = data.cstringusingencoding(nsutf8stringencoding)      var result = [cunsignedchar](count: int(cc_sha512_digest_length), repeatedvalue: 0)     cchmac(cchmacalgorithm(kcchmacalgsha512), ckey, strlen(ckey!), cdata, strlen(cdata!), &result)       let hash = nsmutablestring()     var = 0; < result.count; i++ {         hash.appendformat("%02hhx", result[i])     }      return hash string }

the problem strlen returns uint, while cchmac’s length arguments ints.

while coercion, may use count property of 2 arrays rather calling strlen.

func generatehmac(key: string, data: string) -> string {      var result: [cunsignedchar]     if let ckey = key.cstringusingencoding(nsutf8stringencoding),            cdata = data.cstringusingencoding(nsutf8stringencoding)     {         let algo  = cchmacalgorithm(kcchmacalgsha512)         result = array(count: int(cc_sha512_digest_length), repeatedvalue: 0)          cchmac(algo, ckey, ckey.count-1, cdata, cdata.count-1, &result)     }     else {         // @martinr points out, in theory impossible          // personally, prefer doing using `!`         fatalerror("nil returned when processing input strings utf8")     }      let hash = nsmutablestring()     val in result {         hash.appendformat("%02hhx", val)     }      return hash string }

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