PKCS#7 Signin and verify sign

2019-03-17 10:00发布

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问题:

I am trying to sign and verify sign using PKCS#7. I am following book beginning cryptography with java. I have written sample code to sign and verify. When i am trying to attach a signature and write it to a file and then trying to verify i am getting exception (Exception is given below )

I want to know how do we write this signed data to a file ? Do i need to share keystore also to second person who will verify the sign?

org.bouncycastle.cms.CMSException: message-digest attribute value does not match calculated value
at org.bouncycastle.cms.SignerInformation.doVerify(Unknown Source)
at org.bouncycastle.cms.SignerInformation.verify(Unknown Source)
at org.bouncycastle.cms.SignerInformation.verify(Unknown Source)
at com.inc.cms.test.bc.Test.isValidSignature(Test.java:150)
at com.inc.cms.test.bc.Test.verifyData(Test.java:120)
at com.inc.cms.test.bc.Test.main(Test.java:78)

THANKS A LOT
MY CODE IS BELOW

Please help me to fix this issue. Thanks a lot 

`package com.inc.cms.test.bc;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.CertPathBuilder;
import java.security.cert.CertStore;
import java.security.cert.Certificate;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.PKIXBuilderParameters;
import java.security.cert.PKIXCertPathBuilderResult;
import java.security.cert.TrustAnchor;
import java.security.cert.X509CertSelector;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;

import javax.security.auth.x500.X500Principal;
import javax.security.auth.x500.X500PrivateCredential;

import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.cms.CMSProcessable;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.SignerId;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.x509.X509V1CertificateGenerator;
import org.bouncycastle.x509.X509V3CertificateGenerator;
import org.bouncycastle.x509.extension.AuthorityKeyIdentifierStructure;
import org.bouncycastle.x509.extension.SubjectKeyIdentifierStructure;

public class Test {

    private static final char[] KEY_STORE_PASSWORD = "123456".toCharArray();
    private static final long VALIDITY_PERIOD = 365 * 24 * 60 * 60 * 1000;
    private static final char[] KEY_PASSWORD = "keyPassword".toCharArray();
    public static String ROOT_ALIAS = "root";
    public static String INTERMEDIATE_ALIAS = "intermediate";
    public static String END_ENTITY_ALIAS = "end";
    public static String PLAIN_TEXT = "Hello World!123";

    public static void main(String[] args) {
        try {

            // CREATE KEY STORE
            KeyStore keyStore = createKeyStore();

            // STEP 1. SIGN
            byte[] step1Data = PLAIN_TEXT.getBytes();
            CMSSignedData cmsSignedData = signData(keyStore, step1Data);
            new File("D:\\pkcs7\\encrypted-file.p7b");
            FileOutputStream fileOuputStream = new FileOutputStream(
                    "D:\\pkcs7\\encrypted-file.p7b");
            fileOuputStream.write(cmsSignedData.getEncoded());
            fileOuputStream.flush();
            fileOuputStream.close();

            // STEP 2. READ ENCRYPTED DATA AND VERIFY SIGN AND DECRYPT IT
            File file = new File("D:\\pkcs7\\encrypted-file.p7b");
            FileInputStream fileInputStream = new FileInputStream(file);
            byte[] encryptedAndSignedByte = new byte[(int) file.length()];
            fileInputStream.read(encryptedAndSignedByte);
            fileInputStream.close();
            cmsSignedData = new CMSSignedData(encryptedAndSignedByte);
            if (verifyData(keyStore, cmsSignedData) == true) {
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private static CMSSignedData signData(KeyStore keyStore,
            byte[] encryptedData) throws Exception {
        // GET THE PRIVATE KEY
        PrivateKey key = (PrivateKey) keyStore.getKey(END_ENTITY_ALIAS,
                KEY_PASSWORD);

        Certificate[] chain = keyStore.getCertificateChain(END_ENTITY_ALIAS);
        CertStore certsAndCRLs = CertStore.getInstance("Collection",
                new CollectionCertStoreParameters(Arrays.asList(chain)), "BC");
        X509Certificate cert = (X509Certificate) chain[0];

        // set up the generator
        CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
        gen.addSigner(key, cert, CMSSignedDataGenerator.DIGEST_SHA224);
        gen.addCertificatesAndCRLs(certsAndCRLs);

        // create the signed-data object
        CMSProcessable data = new CMSProcessableByteArray(encryptedData);
        CMSSignedData signed = gen.generate(data, "BC");

        // recreate
        signed = new CMSSignedData(data, signed.getEncoded());
        // ContentInfo conInf = signed.getContentInfo();
        // CMSProcessable sigContent = signed.getSignedContent();
        return signed;
    }

    private static boolean verifyData(KeyStore keyStore, CMSSignedData signed)
            throws Exception {
        // verification step
        X509Certificate rootCert = (X509Certificate) keyStore
                .getCertificate(ROOT_ALIAS);

        if (isValidSignature(signed, rootCert)) {
            System.out.println("verification succeeded");
            return true;
        } else {
            System.out.println("verification failed");
        }
        return false;
    }

    /**
     * Take a CMS SignedData message and a trust anchor and determine if the
     * message is signed with a valid signature from a end entity entity
     * certificate recognized by the trust anchor rootCert.
     */
    private static boolean isValidSignature(CMSSignedData signedData,
            X509Certificate rootCert) throws Exception {

        boolean[] bArr = new boolean[2];
        bArr[0] = true;
        CertStore certsAndCRLs = signedData.getCertificatesAndCRLs(
                "Collection", "BC");
        SignerInformationStore signers = signedData.getSignerInfos();
        Iterator it = signers.getSigners().iterator();

        if (it.hasNext()) {
            SignerInformation signer = (SignerInformation) it.next();
            SignerId signerConstraints = signer.getSID();
            signerConstraints.setKeyUsage(bArr);
            PKIXCertPathBuilderResult result = buildPath(rootCert,
                    signer.getSID(), certsAndCRLs);
            return signer.verify(result.getPublicKey(), "BC");
        }

        return false;
    }

    /**
     * Build a path using the given root as the trust anchor, and the passed in
     * end constraints and certificate store.
     * <p>
     * Note: the path is built with revocation checking turned off.
     */
    public static PKIXCertPathBuilderResult buildPath(X509Certificate rootCert,
            X509CertSelector endConstraints, CertStore certsAndCRLs)
            throws Exception {
        CertPathBuilder builder = CertPathBuilder.getInstance("PKIX", "BC");
        PKIXBuilderParameters buildParams = new PKIXBuilderParameters(
                Collections.singleton(new TrustAnchor(rootCert, null)),
                endConstraints);

        buildParams.addCertStore(certsAndCRLs);
        buildParams.setRevocationEnabled(false);

        return (PKIXCertPathBuilderResult) builder.build(buildParams);
    }

    /**
     * Create a KeyStore containing the a private credential with certificate
     * chain and a trust anchor.
     */
    public static KeyStore createKeyStore() throws Exception {
        KeyStore keyStore = KeyStore.getInstance("JKS");
        keyStore.load(null, null);

        keyStore.load(null, null);

        X500PrivateCredential rootCredential = createRootCredential();
        X500PrivateCredential interCredential = createIntermediateCredential(
                rootCredential.getPrivateKey(), rootCredential.getCertificate());
        X500PrivateCredential endCredential = createEndEntityCredential(
                interCredential.getPrivateKey(),
                interCredential.getCertificate());

        keyStore.setCertificateEntry(rootCredential.getAlias(),
                rootCredential.getCertificate());
        keyStore.setKeyEntry(
                endCredential.getAlias(),
                endCredential.getPrivateKey(),
                KEY_PASSWORD,
                new Certificate[] { endCredential.getCertificate(),
                        interCredential.getCertificate(),
                        rootCredential.getCertificate() });

        keyStore.store(new FileOutputStream("d:\\pkcs7\\KeyStore.jks"),
                KEY_STORE_PASSWORD);
        return keyStore;
    }

    /**
     * Create a random 1024 bit RSA key pair
     */
    public static KeyPair generateRSAKeyPair() throws Exception {
        KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC");
        kpGen.initialize(1024, new SecureRandom());
        return kpGen.generateKeyPair();
    }

    /**
     * Generate a sample V1 certificate to use as a CA root certificate
     */
    public static X509Certificate generateCertificate(KeyPair pair)
            throws Exception {
        X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
        certGen.setSerialNumber(BigInteger.valueOf(1));
        certGen.setIssuerDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setNotBefore(new Date(System.currentTimeMillis()
                - VALIDITY_PERIOD));
        certGen.setNotAfter(new Date(System.currentTimeMillis()
                + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setPublicKey(pair.getPublic());
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");
        return certGen.generateX509Certificate(pair.getPrivate(), "BC");
    }

    /**
     * Generate a sample V1 certificate to use as a CA root certificate
     */
    public static X509Certificate generateRootCert(KeyPair pair)
            throws Exception {
        X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();

        certGen.setSerialNumber(BigInteger.valueOf(1));
        certGen.setIssuerDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setNotBefore(new Date(System.currentTimeMillis()
                - VALIDITY_PERIOD));
        certGen.setNotAfter(new Date(System.currentTimeMillis()
                + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setPublicKey(pair.getPublic());
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        return certGen.generateX509Certificate(pair.getPrivate(), "BC");
    }

    /**
     * Generate a sample V3 certificate to use as an end entity certificate
     */
    public static X509Certificate generateEndEntityCert(PublicKey entityKey,
            PrivateKey caKey, X509Certificate caCert) throws Exception {
        X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();

        certGen.setSerialNumber(BigInteger.valueOf(1));
        certGen.setIssuerDN(caCert.getSubjectX500Principal());
        certGen.setNotBefore(new Date(System.currentTimeMillis()
                - VALIDITY_PERIOD));
        certGen.setNotAfter(new Date(System.currentTimeMillis()
                + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test End Certificate"));
        certGen.setPublicKey(entityKey);
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false,
                new AuthorityKeyIdentifierStructure(caCert));
        certGen.addExtension(X509Extensions.SubjectKeyIdentifier, false,
                new SubjectKeyIdentifierStructure(entityKey));
        certGen.addExtension(X509Extensions.BasicConstraints, true,
                new BasicConstraints(false));
        certGen.addExtension(X509Extensions.KeyUsage, true, new KeyUsage(
                KeyUsage.digitalSignature | KeyUsage.keyEncipherment));

        return certGen.generateX509Certificate(caKey, "BC");
    }

    /**
     * Generate a X500PrivateCredential for the root entity.
     */
    public static X500PrivateCredential createRootCredential() throws Exception {
        KeyPair rootPair = generateRSAKeyPair();
        X509Certificate rootCert = generateRootCert(rootPair);

        return new X500PrivateCredential(rootCert, rootPair.getPrivate(),
                ROOT_ALIAS);
    }

    /**
     * Generate a X500PrivateCredential for the intermediate entity.
     */
    public static X500PrivateCredential createIntermediateCredential(
            PrivateKey caKey, X509Certificate caCert) throws Exception {
        KeyPair interPair = generateRSAKeyPair();
        X509Certificate interCert = generateIntermediateCert(
                interPair.getPublic(), caKey, caCert);

        return new X500PrivateCredential(interCert, interPair.getPrivate(),
                INTERMEDIATE_ALIAS);
    }

    /**
     * Generate a X500PrivateCredential for the end entity.
     */
    public static X500PrivateCredential createEndEntityCredential(
            PrivateKey caKey, X509Certificate caCert) throws Exception {
        KeyPair endPair = generateRSAKeyPair();
        X509Certificate endCert = generateEndEntityCert(endPair.getPublic(),
                caKey, caCert);

        return new X500PrivateCredential(endCert, endPair.getPrivate(),
                END_ENTITY_ALIAS);
    }

    /**
     * Generate a sample V3 certificate to use as an intermediate CA certificate
     */
    public static X509Certificate generateIntermediateCert(PublicKey intKey,
            PrivateKey caKey, X509Certificate caCert) throws Exception {
        X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();

        certGen.setSerialNumber(BigInteger.valueOf(1));
        certGen.setIssuerDN(caCert.getSubjectX500Principal());
        certGen.setNotBefore(new Date(System.currentTimeMillis()));
        certGen.setNotAfter(new Date(System.currentTimeMillis()
                + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal(
                "CN=Test Intermediate Certificate"));
        certGen.setPublicKey(intKey);
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false,
                new AuthorityKeyIdentifierStructure(caCert));
        certGen.addExtension(X509Extensions.SubjectKeyIdentifier, false,
                new SubjectKeyIdentifierStructure(intKey));
        certGen.addExtension(X509Extensions.BasicConstraints, true,
                new BasicConstraints(0));
        certGen.addExtension(X509Extensions.KeyUsage, true, new KeyUsage(
                KeyUsage.digitalSignature | KeyUsage.keyCertSign
                        | KeyUsage.cRLSign));

        return certGen.generateX509Certificate(caKey, "BC");
    }

}

回答1:

Try this:

public static void main(String[] args)throws Exception
{
    String password = "123456";

    MessageDigest md = MessageDigest.getInstance("SHA-256");
    md.update(password.getBytes());

    byte byteData[] = md.digest();

    //convert the byte to hex format method 1
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < byteData.length; i++) {
     sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
    }

    System.out.println("Hex format : " + sb.toString());

    //convert the byte to hex format method 2
    StringBuffer hexString = new StringBuffer();
    for (int i=0;i<byteData.length;i++) {
        String hex=Integer.toHexString(0xff & byteData[i]);
        if(hex.length()==1) hexString.append('0');
        hexString.append(hex);
    }
    System.out.println("Hex format : " + hexString.toString());
}


标签： java cryptography bouncycastle public-key-encryption pkcs#7
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