24 lines
938 B
Java
24 lines
938 B
Java
import java.nio.file.Files;
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import java.nio.file.Path;
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import java.security.KeyPairGenerator;
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import java.security.Signature;
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import java.util.Base64;
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public class SignECDSA {
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public static void main(String[] args) throws Exception {
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final var gen = KeyPairGenerator.getInstance("EC");
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final var kp = gen.genKeyPair();
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final var bytes = Files.readAllBytes(Path.of("plaintext.txt"));
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final var sig = Signature.getInstance("SHA256withECDSA");
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sig.initVerify(kp.getPublic());
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sig.initSign(kp.getPrivate());
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sig.update(bytes);
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final var signature = sig.sign();
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Files.write(Path.of("b-signature.txt"), Base64.getEncoder().encode(signature));
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Files.write(Path.of("b-publickey.txt"), Base64.getEncoder().encode(kp.getPublic().getEncoded()));
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Files.write(Path.of("b-privatekey.txt"), Base64.getEncoder().encode(kp.getPrivate().getEncoded()));
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}
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}
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