96e836ec94
* Digital signature. * Digital signature. move message.txt in src/test/resources/digitalsignature.
34 lines
1.1 KiB
Java
34 lines
1.1 KiB
Java
package com.baeldung.digitalsignature.level1;
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import com.baeldung.digitalsignature.Utils;
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import javax.crypto.Cipher;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.security.MessageDigest;
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import java.security.PublicKey;
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import java.util.Arrays;
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public class DigitalSignatureWithMessageDigestAndCipherVerifying {
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public static void main(String[] args) throws Exception {
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PublicKey publicKey = Utils.getPublicKey();
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byte[] messageBytes = Files.readAllBytes(Paths.get("src/test/resources/digitalsignature/message.txt"));
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MessageDigest md = MessageDigest.getInstance("SHA-256");
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byte[] newMessageHash = md.digest(messageBytes);
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byte[] encryptedMessageHash = Files.readAllBytes(Paths.get("target/digital_signature_1"));
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.DECRYPT_MODE, publicKey);
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byte[] decryptedMessageHash = cipher.doFinal(encryptedMessageHash);
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boolean isCorrect = Arrays.equals(decryptedMessageHash, newMessageHash);
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System.out.println("Signature " + (isCorrect ? "correct" : "incorrect"));
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}
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}
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