27 lines
966 B
Java
27 lines
966 B
Java
import java.security.KeyFactory;
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import java.security.Signature;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.Base64;
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public class VerifyECDSA {
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public static void main(String[] args) throws Exception {
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if (args.length < 3) {
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System.out.println(
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"Please specify in the following order: Public Key (X509), Signature (Base64), Message (plain text)");
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return;
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}
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final String PUBLIC_KEY = args[0];
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final String SIGNATURE = args[1];
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final String MESSAGE = args[2];
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final var kf = KeyFactory.getInstance("EC");
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final var pub = kf.generatePublic(new X509EncodedKeySpec(Base64.getDecoder().decode(PUBLIC_KEY)));
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final var sig = Signature.getInstance("SHA256withECDSA");
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sig.initVerify(pub);
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sig.update(MESSAGE.getBytes());
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System.out.println("Correct: " + sig.verify(Base64.getDecoder().decode(SIGNATURE)));
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}
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}
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