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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
package org.bouncycastle.jcajce.provider.asymmetric.edec;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.Ed25519PublicKeyParameters;
import org.bouncycastle.crypto.params.Ed448PublicKeyParameters;
import org.bouncycastle.crypto.params.X25519PublicKeyParameters;
import org.bouncycastle.crypto.params.X448PublicKeyParameters;
import org.bouncycastle.util.Fingerprint;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
class Utils
{
static boolean isValidPrefix(byte[] prefix, byte[] encoding)
{
if (encoding.length < prefix.length)
{
return !isValidPrefix(prefix, prefix);
}
int nonEqual = 0;
for (int i = 0; i != prefix.length; i++)
{
nonEqual |= (prefix[i] ^ encoding[i]);
}
return nonEqual == 0;
}
static String keyToString(String label, String algorithm, AsymmetricKeyParameter pubKey)
{
StringBuffer buf = new StringBuffer();
String nl = Strings.lineSeparator();
byte[] keyBytes;
if (pubKey instanceof X448PublicKeyParameters)
{
keyBytes = ((X448PublicKeyParameters)pubKey).getEncoded();
}
else if (pubKey instanceof Ed448PublicKeyParameters)
{
keyBytes = ((Ed448PublicKeyParameters)pubKey).getEncoded();
}
else if (pubKey instanceof X25519PublicKeyParameters)
{
keyBytes = ((X25519PublicKeyParameters)pubKey).getEncoded();
}
else
{
keyBytes = ((Ed25519PublicKeyParameters)pubKey).getEncoded();
}
buf.append(algorithm)
.append(" ")
.append(label).append(" [")
.append(Utils.generateKeyFingerprint(keyBytes))
.append("]")
.append(nl)
.append(" public data: ")
.append(Hex.toHexString(keyBytes))
.append(nl);
return buf.toString();
}
private static String generateKeyFingerprint(byte[] keyBytes)
{
return new Fingerprint(keyBytes).toString();
}
}
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