NSString & NSData to MD5

MD5.swift

import Foundation

extension NSData {
    var md5: NSString {
        let digestLength = Int(CC_MD5_DIGEST_LENGTH)
        let md5Buffer = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLength)

        CC_MD5(bytes, CC_LONG(length), md5Buffer)
        let output = NSMutableString(capacity: Int(CC_MD5_DIGEST_LENGTH * 2))
        for i in 0..<digestLength {
            output.appendFormat("%02x", md5Buffer[i])
        }
        return NSString(format: output)
    }
}

extension Data {
    var md5: String {
        return (self as NSData).md5 as String
    }
}

extension NSString {
    var md5: NSString {
        let digestLength = Int(CC_MD5_DIGEST_LENGTH)
        let md5Buffer = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLength)
        CC_MD5(utf8String, CC_LONG(strlen(utf8String)), md5Buffer)

        let output = NSMutableString(capacity: Int(CC_MD5_DIGEST_LENGTH * 2))
        for i in 0..<digestLength {
            output.appendFormat("%02x", md5Buffer[i])
        }

        return NSString(format: output)
    }
}

extension String {
    var md5: String {
        return (self as NSString).md5 as String
    }
}