Java的签名与认证使用，Java签名认证使用,import java.

Java的签名与认证使用，Java签名认证使用,import java.

import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.security.InvalidKeyException;import java.security.Key;import java.security.KeyPair;import java.security.KeyStore;import java.security.KeyStoreException;import java.security.NoSuchAlgorithmException;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.SignatureException;import java.security.UnrecoverableKeyException;import java.security.cert.CertificateException;import java.security.cert.CertificateFactory;import org.apache.commons.io.output.ByteArrayOutputStream;import org.bouncycastle.util.encoders.Base64Encoder;public class Utils {    private static final String STRING_ENCODING = "UTF-8";    public static KeyStore loadKeyStore(File file, String storePassword)            throws IOException, KeyStoreException, NoSuchAlgorithmException,            CertificateException {        return loadKeyStore(KeyStore.getDefaultType(), file, storePassword);    }    public static KeyStore loadKeyStore(String storeType, File file,            String storePassword) throws IOException, KeyStoreException,            NoSuchAlgorithmException, CertificateException {        FileInputStream is = new FileInputStream(file);        try {            KeyStore keystore = KeyStore.getInstance(storeType);            keystore.load(is,                    storePassword == null ? null : storePassword.toCharArray());            return keystore;        } finally {            is.close();        }    }    public static KeyPair getKeyPair(KeyStore keyStore, String alias,            String keyPassword) throws UnrecoverableKeyException,            KeyStoreException, NoSuchAlgorithmException,            PrivateKeyNotFoundException {        Key key = getKey(keyStore, alias, keyPassword);        if (key instanceof PrivateKey) {            return new KeyPair(getPublicKey(keyStore, alias), (PrivateKey) key);        } else {            throw new PrivateKeyNotFoundException("The given key " + alias                    + " is not a private key.");        }    }    public static PublicKey getPublicKey(KeyStore keyStore, String alias)            throws KeyStoreException {        return keyStore.getCertificate(alias).getPublicKey();    }    public static Key getKey(KeyStore keyStore, String alias, String keyPassword)            throws KeyStoreException, NoSuchAlgorithmException,            UnrecoverableKeyException {        return keyStore.getKey(alias,                keyPassword == null ? null : keyPassword.toCharArray());    }    public static PublicKey loadPublicKeyFromCertificate(File certificateFile)            throws FileNotFoundException, CertificateException, IOException {        return loadPublicKeyFromCertificate(certificateFile, "X.509");    }    public static PublicKey loadPublicKeyFromCertificate(File certificateFile,            String certificateType) throws FileNotFoundException,            CertificateException, IOException {        PublicKey publicKey = null;        FileInputStream fis = new FileInputStream(certificateFile);        try {            CertificateFactory cf = CertificateFactory                    .getInstance(certificateType);            java.security.cert.Certificate cert = cf.generateCertificate(fis);            publicKey = cert.getPublicKey();        } finally {            fis.close();        }        return publicKey;    }    public static boolean verify(File certificateFile, File signatureFile,            File dataFile, String signAlgorithm) throws FileNotFoundException,            IOException, CertificateException, NoSuchAlgorithmException,            InvalidKeyException, SignatureException {        byte[] sigToVerify = null;        FileInputStream sigfis = new FileInputStream(signatureFile);        try {            sigToVerify = new byte[sigfis.available()];            sigfis.read(sigToVerify);        } finally {            sigfis.close();        }        return verify(dataFile, sigToVerify, certificateFile, signAlgorithm);    }    public static boolean verify(File dataFile, byte[] sigToVerify,            File certificateFile, String signAlgorithm)            throws FileNotFoundException, IOException, CertificateException,            NoSuchAlgorithmException, InvalidKeyException, SignatureException {        FileInputStream keyfis = new FileInputStream(certificateFile);        try {            byte[] encKey = new byte[keyfis.available()];            keyfis.read(encKey);        } finally {            keyfis.close();        }        PublicKey pubKey = loadPublicKeyFromCertificate(certificateFile);        Signature sig = Signature.getInstance(signAlgorithm);        sig.initVerify(pubKey);        FileInputStream datafis = new FileInputStream(dataFile);        try {            BufferedInputStream bufin = new BufferedInputStream(datafis);            try {                byte[] buffer = new byte[1024];                int len;                while (bufin.available() != 0) {                    len = bufin.read(buffer);                    sig.update(buffer, 0, len);                }            } finally {                if (bufin != null) {                    bufin.close();                }            }        } finally {            if (datafis != null) {                datafis.close();            }        }        return sig.verify(sigToVerify);    }    public static boolean verifyUsingBase64Decode(File certificateFile,            File signatureFile, File dataFile, String signAlgorithm)            throws FileNotFoundException, IOException, CertificateException,            NoSuchAlgorithmException, InvalidKeyException, SignatureException {        byte[] sigToVerify = null;        FileInputStream sigfis = new FileInputStream(signatureFile);        try {            sigToVerify = new byte[sigfis.available()];            sigfis.read(sigToVerify);        } finally {            sigfis.close();        }        ByteArrayOutputStream signStream = new ByteArrayOutputStream();        new Base64Encoder().decode(sigToVerify, 0, sigToVerify.length,                signStream);        return verify(dataFile, signStream.toByteArray(), certificateFile,                signAlgorithm);    }    public static boolean verify(File certificateFile, File signatureFile,            String data, String signAlgorithm) throws FileNotFoundException,            IOException, CertificateException, NoSuchAlgorithmException,            InvalidKeyException, SignatureException {        byte[] sigToVerify = null;        FileInputStream sigfis = new FileInputStream(signatureFile);        try {            sigToVerify = new byte[sigfis.available()];            sigfis.read(sigToVerify);        } finally {            sigfis.close();        }        return verify(data, sigToVerify, certificateFile, signAlgorithm);    }    public static boolean verify(String dataFile, byte[] sigToVerify,            File certificateFile, String signAlgorithm)            throws FileNotFoundException, IOException, CertificateException,            NoSuchAlgorithmException, InvalidKeyException, SignatureException {        FileInputStream keyfis = new FileInputStream(certificateFile);        try {            byte[] encKey = new byte[keyfis.available()];            keyfis.read(encKey);        } finally {            keyfis.close();        }        PublicKey pubKey = loadPublicKeyFromCertificate(certificateFile);        Signature sig = Signature.getInstance(signAlgorithm);        sig.initVerify(pubKey);        sig.update(dataFile.getBytes(STRING_ENCODING));        return sig.verify(sigToVerify);    }    public static boolean verifyUsingBase64Decode(File certificateFile,            File signatureFile, String data, String signAlgorithm)            throws FileNotFoundException, IOException, CertificateException,            NoSuchAlgorithmException, InvalidKeyException, SignatureException {        byte[] sigToVerify = null;        FileInputStream sigfis = new FileInputStream(signatureFile);        try {            sigToVerify = new byte[sigfis.available()];            sigfis.read(sigToVerify);        } finally {            sigfis.close();        }        ByteArrayOutputStream signStream = new ByteArrayOutputStream();        new Base64Encoder().decode(sigToVerify, 0, sigToVerify.length,                signStream);        return verify(data, signStream.toByteArray(), certificateFile,                signAlgorithm);    }    protected static void writeToFileUsingBase64Encode(byte[] realSig, File f2)            throws FileNotFoundException, IOException {        FileOutputStream sigfos2 = new FileOutputStream(f2);        new Base64Encoder().encode(realSig, 0, realSig.length, sigfos2);        sigfos2.close();    }    protected static void writeToFile(File file, byte[] realSig)            throws FileNotFoundException, IOException {        FileOutputStream sigfos = new FileOutputStream(file);        try {            sigfos.write(realSig);        } finally {            sigfos.close();        }    }    public static byte[] sign(File dataToSign, File keyStoreFile,            String storePassword, String alias, String keyPassword,            String signAlgorithm) throws IOException, KeyStoreException,            NoSuchAlgorithmException, CertificateException,            UnrecoverableKeyException, PrivateKeyNotFoundException,            InvalidKeyException, FileNotFoundException, SignatureException {        Signature dsa = null;        KeyStore keyStore = loadKeyStore(keyStoreFile, storePassword);        KeyPair pair = getKeyPair(keyStore, alias, keyPassword);        PrivateKey priv = pair.getPrivate();        dsa = Signature.getInstance(signAlgorithm);        dsa.initSign(priv);        FileInputStream fis = new FileInputStream(dataToSign);        try {            BufferedInputStream bufin = new BufferedInputStream(fis);            try {                byte[] buffer = new byte[1024];                int len;                while (bufin.available() != 0) {                    len = bufin.read(buffer);                    dsa.update(buffer, 0, len);                }            } finally {                if (bufin != null) {                    bufin.close();                }            }        } finally {            if (fis != null) {                fis.close();            }        }        return dsa.sign();    }    public static byte[] sign(String dataToSign, File keyStoreFile,            String storePassword, String alias, String keyPassword,            String signAlgorithm) throws IOException, KeyStoreException,            NoSuchAlgorithmException, CertificateException,            UnrecoverableKeyException, PrivateKeyNotFoundException,            InvalidKeyException, FileNotFoundException, SignatureException {        Signature dsa = null;        KeyStore keyStore = loadKeyStore(keyStoreFile, storePassword);        KeyPair pair = getKeyPair(keyStore, alias, keyPassword);        PrivateKey priv = pair.getPrivate();        dsa = Signature.getInstance(signAlgorithm);        dsa.initSign(priv);        dsa.update(dataToSign.getBytes(STRING_ENCODING));        return dsa.sign();    }}