Cannot invoke 'CCHmac' with an argument list of type '(UInt32, UnsafePointer<Int8>, UInt, [CChar], Int, UnsafeMutablePointer<CUnsignedChar>)

Question

I updated xCode and/or swift 1.0 to 1.2 and got lots of errors,

I knew some of the methods are updated/Changed in Swift 1.2 hence I started updating my whole project to swift 1.2. I am stuck on this line:

CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1), cKey, strlen(cKey), str!, strLen, result)

It's throwing error Cannot invoke 'CCHmac' with an argument list of type '(UInt32, UnsafePointer<Int8>, UInt, [CChar], Int, UnsafeMutablePointer<CUnsignedChar>)'

here is my code

.
.
.
 let str = cred.cStringUsingEncoding(NSUTF8StringEncoding)
        let strLen:Int = Int(cred.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
        let digestLen = Int(CC_SHA1_DIGEST_LENGTH)
        let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)
        let objcKey = key as NSString
        let keyStr = Key.cStringUsingEncoding(NSUTF8StringEncoding)
        let keyLen:Int = Int(Key.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))

        var st:NSString = dataFromHexadecimalString(Key)!
        let cKey = st.cStringUsingEncoding(NSUTF8StringEncoding)


        CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1), cKey, strlen(cKey), str!, strLen, result)
.
.
.

Note: I changed keyLen and strLen from Uint to Int but still its throwing the same error.

Answer 1

I solved it just cast the strlen(cKey) to int like Int(strlen(cKey))

whole line look like is

CCHmac(CCHmacAlgorithm(kCCHmacAlgSHA1), cKey, Int(strlen(cKey)), str!, strLen, result)