Hash string with SHA512 in Swift

Question

Anyone knows how to reproduce PHP hashing method hash(‘SHA512’, $value, true) in swift ? I tried to use CommonCrypto C library with this code :

extension String {
    func digest(length:Int32, gen:(data: UnsafePointer<Void>, len: CC_LONG, md: UnsafeMutablePointer<UInt8>) -> UnsafeMutablePointer<UInt8>) -> String {
        var cStr = [UInt8](self.utf8)
        var result = [UInt8](count:Int(length), repeatedValue:0)
        gen(data: &cStr, len: CC_LONG(cStr.count), md: &result)
        let output = NSMutableString(capacity:Int(length))
        for r in result {
            output.appendFormat("%02x", r)
        }
        return String(output)
    }
}

and used it like this :

var digest = salted.digest(CC_SHA512_DIGEST_LENGTH, gen: {(data, len, md) in CC_SHA512(data,len,md)})

But I don't get the right output

EDIT :

I have some PHP code :

echo base64_encode(hash('sha512', '8yOrBmkd', true)); // output: rlltLWeWaQCrfNTYMa0CcIs0mfLoHGAynrd+d8H65+rGAzHS/BSWsumwSmcxF9aAG9TIzXx+HOjArPyLL3herg==

And I want my swift code to output the same. The Base64 encoding is ok :

let utf8str = input.dataUsingEncoding(NSUTF8StringEncoding)!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
                let base64Encoded = utf8str!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
                print("Encoded:  \(base64Encoded)")

But the hashing part return an output the same value as this PHP code :

echo base64_encode(hash('sha512', '8yOrBmkd', false)); // output: YWU1OTZkMmQ2Nzk2NjkwMGFiN2NkNGQ4MzFhZDAyNzA4YjM0OTlmMmU4MWM2MDMyOWViNzdlNzdjMWZhZTdlYWM2MDMzMWQyZmMxNDk2YjJlOWIwNGE2NzMxMTdkNjgwMWJkNGM4Y2Q3YzdlMWNlOGMwYWNmYzhiMmY3ODVlYWU=

Answer 1

Updating this with swift 4

func sha512Hex( string: String) -> String {
    var digest = [UInt8](repeating: 0, count: Int(CC_SHA512_DIGEST_LENGTH))
    if let data = string.data(using: String.Encoding.utf8) {
        let value =  data as NSData
        CC_SHA512(value.bytes, CC_LONG(data.count), &digest)

    }
    var digestHex = ""
    for index in 0..<Int(CC_SHA512_DIGEST_LENGTH) {
        digestHex += String(format: "%02x", digest[index])
    }

    return digestHex
}


func sha512(string: String) -> [UInt8] {
    var digest = [UInt8](repeating: 0, count: Int(CC_SHA512_DIGEST_LENGTH))
    let data = string.data(using: String.Encoding.utf8 , allowLossyConversion: true)
    let value =  data! as NSData
    CC_SHA512(value.bytes, CC_LONG(value.length), &digest)

    return digest
}

func sha512Base64(string: String) -> String {
    let digest = NSMutableData(length: Int(CC_SHA512_DIGEST_LENGTH))!
    if let data = string.data(using: String.Encoding.utf8) {

        let value =  data as NSData
        let uint8Pointer = UnsafeMutablePointer<UInt8>.allocate(capacity: digest.length)
        CC_SHA512(value.bytes, CC_LONG(data.count), uint8Pointer)

    }
    return digest.base64EncodedString(options: NSData.Base64EncodingOptions([]))
}

Testing

    let vad = sha512Hex(string: "8yOrBmkd")
    print(vad)

    let digestRaw = sha512(string:"8yOrBmkd")
    print("decimal array:\n\(digestRaw)")
    print("hexadecimal:\n\(NSData(bytes:digestRaw, length:digestRaw.count).description)")

    let digestBase64 = sha512Base64(string:"8yOrBmkd")
    print("Base64:\n\(digestBase64)")