Swift版MD5加密

概述extension String {var md5: String! { let str = self.cStringUsingEncoding(NSUTF8StringEncoding) let strLen = CC_LONG(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)) let digestLen =

extension String  {var md5: String! {    let str = self.cStringUsingEnCoding(NSUTF8StringEnCoding)    let strLen = CC_LONG(self.lengthOfBytesUsingEnCoding(NSUTF8StringEnCoding))    let digestLen = Int(CC_MD5_DIGEST_LENGTH)    let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)    CC_MD5(str!,strLen,result)    let hash = NSMutableString()    for i in 0..<digestLen {        hash.appendFormat("%02x",result[i])    }    result.dealloc(digestLen)    return String(hash)}

}

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