Swift MD5

Swift-MD5.swift

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 = UnsafeMutablePointer<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(format: hash)
  }
}

TheProjectName-Bridging-Header.h

#import <CommonCrypto/CommonCrypto.h> // required for MD5