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<p>我试图在swift3中加密一个字符串,我的加密每次都会给出不同的输出。为什么?(我在python中尝试过类似的加密,加密后的输出总是相同的)。在</p>
<p>下面是我的Swift 3 aesEncrypt函数:</p>
<pre><code>func aesEncrypt(key:String, iv:Array<Any>, options:Int = kCCOptionPKCS7Padding) -> String? {
if let keyData = sha256(string:key),
let data = self.data(using: String.Encoding.utf8),
let cryptData = NSMutableData(length: Int((data.count)) + kCCBlockSizeAES128) {
let keyLength = size_t(kCCKeySizeAES128)
let operation: CCOperation = UInt32(kCCEncrypt)
let algorithm: CCAlgorithm = UInt32(kCCAlgorithmAES128)
let options: CCOptions = UInt32(options)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algorithm,
options,
(keyData as NSData).bytes, keyLength,
iv,
(data as NSData).bytes, data.count,
cryptData.mutableBytes, cryptData.length,
&numBytesEncrypted)
// ADDED PRINT STATEMENTS
print("keyData")
print(keyData)
print("\(keyData as NSData)")
print("iv")
print(iv)
var hex_iv = toHexString(arr: iv as! [UInt8])
print(hex_iv)
print("data")
print(data)
print("\(data as NSData)")
print("encryption: cryptdata")
print(cryptData)
print("encryption: num bytes encrypted")
print(numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess) {
cryptData.length = Int(numBytesEncrypted)
let base64cryptString = cryptData.base64EncodedString(options: .lineLength64Characters)
return base64cryptString
}
else {
return nil
}
}
return nil
}
</code></pre>
<p>当我尝试使用initial_string=“hello”运行以下代码时,每次都会得到不同的加密输出字符串。在</p>
^{pr2}$
<p>第一次运行带有“hello”字符串的代码的示例输出:</p>
<pre><code>keyData
32 bytes
<d5a78c66 e9b3ed40 b3a92480 c732527f 1a919fdc f68957d2 b7e9218f 6221085d>
iv
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
data
5 bytes
<68656c6c 6f>
encryption: cryptdata
<b17d67fc 26e3f316 6a2bdfbf 9d387c2d 00000000 00>
encryption: num bytes encrypted
16
Encrypted string
Optional("sX1n/Cbj8xZqK9+/nTh8LQ==")
</code></pre>
<p>第二次运行带有“hello”字符串的代码的示例输出:</p>
<pre><code>keyData
32 bytes
<d5a78c66 e9b3ed40 b3a92480 c732527f 1a919fdc f68957d2 b7e9218f 6221085d>
iv
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
data
5 bytes
<68656c6c 6f>
encryption: cryptdata
<01b9f69b 45deb31d eda46c2d dc9ad9e8 00000000 00>
encryption: num bytes encrypted
16
Encrypted string
Optional("Abn2m0Xesx3tpGwt3JrZ6A==")
</code></pre>
<p>你能告诉我为什么同一个key,iv,和string每次的输出都不一样吗?谢谢!在</p>