B4X:
nativeMe.InitializeContext
Dim Signature As String=nativeMe.RunMethod("getSHA256RSA",Array(Canonico,$"4N4DfFoKq9Cg25AVmCk3V5VfKypdinHE/nUWfBmXxhA="$))
Log(Signature)
#If Java
import android.util.Base64;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.MessageDigest;
import java.util.Locale;
import android.text.TextUtils;
public static String getSHA256RSA(String input, String strPk) throws Exception
{
// Remove markers and new line characters in private key
String realPK = strPk.replaceAll("-----END PRIVATE KEY-----", "")
.replaceAll("-----BEGIN PRIVATE KEY-----", "")
.replaceAll("\n", "");
byte[] b1 = realPK.getBytes("UTF-8");
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(b1);
KeyFactory kf = KeyFactory.getInstance("RSA");
Signature privateSignature = Signature.getInstance("SHA256withRSA");
privateSignature.initSign(kf.generatePrivate(spec));
privateSignature.update(input.getBytes("UTF-8"));
byte[] s = privateSignature.sign();
return Base64.encodeToString(s, Base64.DEFAULT);
}
#End If