工作中常常使用的几种加密以及签名的方式：RSA加密

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import java.io.FileInputStream;import java.io.IOException;import java.math.BigInteger;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import java.security.KeyFactory;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;public class RSACoder {    private static final String Algorithm = "RSA";    public static final String Signature_Algorithm_MD5 = "MD5withRSA";    public static final String Signature_Algorithm_SHA1 = "SHA1WithRSA";        public static String signMS(String data, String privateKeyFile) throws Exception {     PrivateKey privateKey = getPrivateKeyPem(privateKeyFile);        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKey.getEncoded());            KeyFactory keyFactory = KeyFactory.getInstance(Algorithm);           PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);            Signature signature = Signature.getInstance(Signature_Algorithm_SHA1);          signature.initSign(priKey);          signature.update(data.getBytes("UTF-8"));           return Base64.encode(signature.sign());      }  private static PrivateKey getPrivateKeyPem(String fileName) throws Exception {    String key = readFile(fileName, "UTF-8");    byte[] keyBytes = buildPKCS8Key(key);        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);        KeyFactory keyFactory = KeyFactory.getInstance(Algorithm);        PrivateKey privateKey = keyFactory.generatePrivate(keySpec);        return privateKey;           }        private static byte[] buildPKCS8Key(String privateKey) throws IOException {        if (privateKey.contains("-----BEGIN PRIVATE KEY-----")) {            return Base64.decode(privateKey.replaceAll("-----\\w+ PRIVATE KEY-----", ""));        } else if (privateKey.contains("-----BEGIN RSA PRIVATE KEY-----")) {            final byte[] innerKey = Base64.decode(privateKey.replaceAll("-----\\w+ RSA PRIVATE KEY-----", ""));            final byte[] result = new byte[innerKey.length + 26];            System.arraycopy(Base64.decode("MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKY="), 0, result, 0, 26);            System.arraycopy(BigInteger.valueOf(result.length - 4).toByteArray(), 0, result, 2, 2);            System.arraycopy(BigInteger.valueOf(innerKey.length).toByteArray(), 0, result, 24, 2);            System.arraycopy(innerKey, 0, result, 26, innerKey.length);            return result;        } else {            return Base64.decode(privateKey);        }    }        private static String readFile(String filePath, String charSet) throws Exception {        FileInputStream fileInputStream = new FileInputStream(filePath);        try {            FileChannel fileChannel = fileInputStream.getChannel();            ByteBuffer byteBuffer = ByteBuffer.allocate((int) fileChannel.size());            fileChannel.read(byteBuffer);            byteBuffer.flip();            return new String(byteBuffer.array(), charSet);        } finally {            fileInputStream.close();        }    }        public static boolean verifyMS(String data, String signData, String publicKeyFile)              throws Exception {    PublicKey publicKey = getPubliceKeyPem(publicKeyFile);        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey.getEncoded());    KeyFactory keyFactory = KeyFactory.getInstance(Algorithm);        PublicKey pubKey = keyFactory.generatePublic(keySpec);            Signature signature = Signature.getInstance(Signature_Algorithm_SHA1);          signature.initVerify(pubKey);          signature.update(data.getBytes("UTF-8"));        return signature.verify(Base64.decode(signData));      }        private static PublicKey getPubliceKeyPem(String fileName) throws Exception {    String key = readFile(fileName, "UTF-8");        key = key.replaceAll("\\-{5}[\\w\\s]+\\-{5}[\\r\\n|\\n]", "");        KeyFactory keyFactory = KeyFactory.getInstance(Algorithm);        byte[] encodedKey = Base64.decode(key);        PublicKey pubKey = keyFactory                .generatePublic(new X509EncodedKeySpec(encodedKey));        return pubKey;    }}
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