public void TrimLeadingZeroes()
{
Assert.That(
Pkcs8.TrimLeadingZeroes(new byte[] { 0, 1 }, alignTo8Bytes: false),
Is.EqualTo(new byte[] { 1 }));
Assert.That(
Pkcs8.TrimLeadingZeroes(new byte[] { 0, 1 }, alignTo8Bytes: true),
Is.EqualTo(new byte[] { 0, 0, 0, 0, 0, 0, 0, 1 }));
Assert.That(
Pkcs8.TrimLeadingZeroes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, alignTo8Bytes: false),
Is.EqualTo(new byte[] { 1 }));
Assert.That(
Pkcs8.TrimLeadingZeroes(new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, alignTo8Bytes: true),
Is.EqualTo(new byte[] { 0, 0, 0, 0, 0, 0, 0, 1 }));
}
public void RsaFuzzTest()
{
// Create many RSA keys, encode them in PKCS8, verify the Pkcs8 class can decode them correctly.
// This test does take a few (possibly 10s of) seconds, longer than most unit tests.
for (int i = 0; i < 1000; i++)
{
// This SecureRandom constructor is deprecated,
// but is the easiest way to create a deterministic SecureRandom.
#pragma warning disable CS0618
var rnd = new Org.BouncyCastle.Security.SecureRandom(new byte[] { (byte)(i & 0xff), (byte)((i >> 8) & 0xff) });
#pragma warning restore CS0618
var rsa = new Org.BouncyCastle.Crypto.Generators.RsaKeyPairGenerator();
// 384 is the shortest valid key length. Use this for speed.
rsa.Init(new Org.BouncyCastle.Crypto.KeyGenerationParameters(rnd, 384));
var keys = rsa.GenerateKeyPair();
var pkcs8Generator = new Org.BouncyCastle.OpenSsl.Pkcs8Generator(keys.Private);
var pem = pkcs8Generator.Generate();
var ms = new System.IO.MemoryStream();
var stWriter = new System.IO.StreamWriter(ms);
var pemWriter = new Org.BouncyCastle.OpenSsl.PemWriter(stWriter);
pemWriter.WriteObject(pem);
stWriter.Close();
var pkcs8 = System.Text.Encoding.ASCII.GetString(ms.ToArray());
var rsaParameters = Pkcs8.DecodeRsaParameters(pkcs8);
var key = RSA.Create();
try
{
// Test that the parameters can be imported.
// Throws CryptographicException if the rsaParameters is invalid
key.ImportParameters(rsaParameters);
}
catch (CryptographicException e)
{
// Fails in iteration 8 without the Pkcs8 fix in PR#937
Assert.Fail($"Failed in iteration {i}: {e}");
}
// Check that all the parameters exported are equal to the originally created parameters
var exportedParams = key.ExportParameters(true);
var privateKey = (Org.BouncyCastle.Crypto.Parameters.RsaPrivateCrtKeyParameters)keys.Private;
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.P, false), Is.EqualTo(privateKey.P.ToByteArrayUnsigned()));
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.Q, false), Is.EqualTo(privateKey.Q.ToByteArrayUnsigned()));
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.DP, false), Is.EqualTo(privateKey.DP.ToByteArrayUnsigned()));
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.DQ, false), Is.EqualTo(privateKey.DQ.ToByteArrayUnsigned()));
var publicKey = (Org.BouncyCastle.Crypto.Parameters.RsaKeyParameters)keys.Public;
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.Exponent, false), Is.EqualTo(publicKey.Exponent.ToByteArrayUnsigned()));
Assert.That(Pkcs8.TrimLeadingZeroes(exportedParams.Modulus, false), Is.EqualTo(publicKey.Modulus.ToByteArrayUnsigned()));
}
}