Create hash in swift using key and message

Question

I want to create an SHA1 hmac hash of a string using a key in swift. In obj-c I used this and it worked great:

+(NSString *)sha1FromMessage:(NSString *)messa         


        

Answer 1

The last parameter of the CCHmac() function has the type UnsafeMutablePointer because that's where the result is written to. You have to declare cHMAC as variable and pass it as an in-out expression with &. In addition, some type conversions are necessary:

var cHMAC = [CUnsignedChar](count: Int(CC_SHA1_DIGEST_LENGTH), repeatedValue: 0)
CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1), cKey, UInt(cKey.count), cData, UInt(cData.count), &cHMAC)