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java - 带有 Bouncy CaSTLe 的 Java 中的 PBKDF2 与 .NET Rfc2898DeriveBytes?

转载 作者:塔克拉玛干 更新时间:2023-11-02 20:16:37 29 4
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我有一些使用 PBKDF2 生成 key 的 C# 代码。

//byte[] salt = new RNGCryptoServiceProvider().GetBytes(salt);
byte[] salt = new byte[] { 19, 3, 248, 189, 144, 42, 57, 23 }; // for testing

byte[] bcKey = new Rfc2898DeriveBytes("mypassword", salt, 8192).GetBytes(32);

这很好用。我正在尝试使用 Bouncy CaSTLe 在 Java 中实现相同的功能。无法让它工作(Java 缺少无符号类型这一事实使它更加烦人)。

SecureRandom random = new SecureRandom();
byte[] salt = u2s(new int[] { 19, 3, 248, 189, 144, 42, 57, 23 });
//random.nextBytes(salt);

PBEParametersGenerator generator = new PKCS5S2ParametersGenerator();
generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(("BLK" + password).toCharArray()), salt, keyTransformationRounds);
KeyParameter params = (KeyParameter)generator.generateDerivedParameters(keyLengthBits);
byte[] bcKey = params.getKey();
int[] bcKeyU = s2u(bcKey);
System.out.println(new String(Base64.encode(bcKey), "UTF-8"));

// Helper functions because Java has no unsigned types
//
// EDIT: THESE FUNCTIONS ARE INCORRECT.
// See my answer below for the correct versions.
//
static byte[] u2s(int[] unsignedArray) throws IOException
{
byte[] signedArray = new byte[unsignedArray.length];
for (int i = 0; i < signedArray.length; i++)
{
if (unsignedArray[i] < 0 || unsignedArray[i] > 255)
{
throw new IOException("unsignedArray at " + i + " was not within the range 0 to 255.");
}

signedArray[i] = (byte)(unsignedArray[i] - 128);
}

return signedArray;
}

static int[] s2u(byte[] signedArray)
{
int[] unsignedArray = new int[signedArray.length];
for (int i = 0; i < unsignedArray.length; i++)
{
unsignedArray[i] = (int)(signedArray[i] + 128);
}

return unsignedArray;
}

生成的 bcKey 字节数组不同。我究竟做错了什么?我是要正确处理从未签名到已签名的转换,还是不会像我预期的那样工作?

最佳答案

我没有正确处理有符号/无符号的转换。下面是一些演示整数数组(表示无符号字节数组)和有符号字节数组之间转换的辅助函数。

检查 intsToBytes 中 0-255 范围之外的整数不是必需的,但可能有助于调试。

static byte[] intsToBytes(int[] ints)
{
byte[] bytes = new byte[ints.length];
for (int i = 0; i < ints.length; i++)
{
if (ints[i] < 0 || ints[i] > 255) System.out.println(String.format("WARNING: ints at index %1$d (%2$d) was not a valid byte value (0-255)", i, ints[i]));

bytes[i] = (byte)ints[i];
}

return bytes;
}

static int[] bytesToInts(byte[] bytes)
{
int[] ints = new int[bytes.length];
for (int i = 0; i < bytes.length; i++)
{
ints[i] = bytes[i] & 0xff;
}

return ints;
}

关于java - 带有 Bouncy CaSTLe 的 Java 中的 PBKDF2 与 .NET Rfc2898DeriveBytes?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6359576/

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