Swift MD5 support to String

Bridge.h

#import <CommonCrypto/CommonCrypto.h>

String+md5.swift

import Foundation

extension String {
    func md5() -> String! {
        let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
        let strLen = CUnsignedInt(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
        let digestLen = Int(CC_MD5_DIGEST_LENGTH)
        let result = UnsafePointer<CUnsignedChar>.alloc(digestLen)
        
        CC_MD5(str!, strLen, result)
        
        var hash = NSMutableString()
        for i in 0..<digestLen {
            hash.appendFormat("%02x", result[i])
        }
        
        result.destroy()
        
        return String(hash)
    }
}

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