使用 3DES + ECB 算法加密密码时遇到问题。
这是我使用的代码:
class func encryptPassword(pass: String) -> String {
let keyString = "123456789012345678901234"
let keyData: NSData! = (keyString as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
let keyBytes = UnsafePointer<UInt8>(keyData.bytes)
let data: NSData! = (pass as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
let dataLength = UInt(data.length)
let dataBytes = UnsafePointer<UInt8>(data.bytes)
var cryptData = NSMutableData(length: Int(dataLength) + kCCBlockSize3DES)!
var cryptPointer = UnsafeMutablePointer<UInt8>(cryptData.mutableBytes)
var cryptLength = size_t(cryptData.length)
let keyLength = size_t(kCCKeySize3DES)
let operation: CCOperation = UInt32(kCCEncrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionECBMode | kCCOptionPKCS7Padding)
var numBytesEncrypted :UInt = 0
var cryptStatus = CCCrypt(operation,
algoritm,
options,
keyBytes, keyLength,
nil,
dataBytes, dataLength,
cryptPointer, cryptLength,
&numBytesEncrypted)
var base64cryptString = ""
if UInt32(cryptStatus) == UInt32(kCCSuccess) {
let x: UInt = numBytesEncrypted
cryptData.length = Int(numBytesEncrypted)
println("cryptLength = \(numBytesEncrypted),\n cryptData = \(cryptData)\n")
base64cryptString = cryptData.base64EncodedStringWithOptions(nil)
} else {
println("Error: \(cryptStatus)")
}
return base64cryptString
}
}
这可行,但验证失败。我使用在线加密器来实现类似的功能http://www.tools4noobs.com/online_tools/encrypt/选择 TripleDES 和 ECB
对于代码
let encrypted = Utils.encryptPassword("123456789")
控制台显示
cryptData = <1dd50935 b702084b d164ce3e 9427c493>
在线转换器显示
1dd50935b702084bf9fbee67c9643874
即前 8 个字节是正确的,但最后一个字节是错误的。怎么会这样?代码可能有什么问题?
===========编辑============
正如@Artjom所说 - 应该添加零值到完整的块中。
start 中的这段代码添加了零值:
// Trim password
var password = pass.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
// Adding null padding
let count = 8 - countElements(password) % 8
for i in 1...count {
password += "\0"
}
然后使用“password”var代替传入的“pass”生成“data”
并删除选项的填充
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
Thanks