openssl rsa java 大于117的长字符串加密

佚名 6年前 (2019-04-26) 随笔 1339人围观抢沙发百度已收录

package org.yood.rsa.util;

import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.pkcs.RSAPrivateKeyStructure;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;


public class BestRSA {

    public static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC0kgVXWgRcOLyFbfHNKK55syz/" +
            "GhhMzGLPFj5AzczanP7NSCQEPPYhehMYhGUZI+Du8WS1yfOQ6SUYIYKZRuLUSSm4" +
            "ScsjhY+1LED9S+LDzDWCWnQah4Q4z0owNRySJqCSO4uA+ARg954n6kbXIg4hl2LM" +
            "UYelcocj1lBkymjGaQIDAQAB";

    public static String privateKey = "MIICXQIBAAKBgQC0kgVXWgRcOLyFbfHNKK55syz/GhhMzGLPFj5AzczanP7NSCQE" +
            "PPYhehMYhGUZI+Du8WS1yfOQ6SUYIYKZRuLUSSm4ScsjhY+1LED9S+LDzDWCWnQa" +
            "h4Q4z0owNRySJqCSO4uA+ARg954n6kbXIg4hl2LMUYelcocj1lBkymjGaQIDAQAB" +
            "AoGBAJftSCsv5P1HC29kiw8oDGz/EXvuE8YCLZy5xVU3EwZZE5Xa/drHA/w0vv5g" +
            "3sMhSe8hEbBWo+UoFPrRrxWR6+RwU0Mfrn9kAbSmmK5M8aoOG+fx/++mhmwH0fuN" +
            "BWcMZbcAti0n3DBFzhXjcmVqaSM9Z6eFREnX+d639cfwXEuRAkEAxlAY9wedTPdC" +
            "sTwtCpuPn5bNA+vBoTS+GcrEcP5H5ComWXxbPyvY8nCE1PCln/+FIddTo5TnDBAl" +
            "rondH3gS1QJBAOkYrmmChIYwAzRKjkaGRPyCJ+VLYIZ+yQis3udUDmOWxP3xKnBV" +
            "3j+BvD1GqhVBEHxPRBVWDKQ4+4AlWg2YZ0UCQQCoUQNfZ48S7Com07RG9JGKGiwX" +
            "z9mgQWu36Gmina/W8A9slCe+DjEsVGPpd/abPfx5JJFQnekcS/gvk8OiGf+hAkBU" +
            "XYKC3aJpjucZ/gIQtHgzjEg0TVvaUfkhErB6uYmbse4Km0bo8atHAQXIh9L3bl0x" +
            "IN9beZGJvrYIY3x8fzShAkADMutFaI6q6buVGkqGR6pNe6V1XDBdKPGvC5xhTgiS" +
            "3lTO5GjdHqW4+9SyR97USTyxRZXEWMSD/73ZQE592Mfy";


    private static String algorithm = "RSA";
    private static final int MAX_ENCRYPT_BLOCK = 117;
    private static final int MAX_DECRYPT_BLOCK = 128;
    private static String data = "1234561234561234561234561234561234561234561234561234561234561234561234561\n" +
            "2345612345612345612345612345612345612345612345612345612345612345612345612\n" +
            "4561234561234561234561234561234561234561234561234561234561234561234561234\n" +
            "5612345612345612345612345612345612345612345612345612345612345612345612345\n" +
            "6123456123456123456123456123456123456123456123456123456123456123456123456\n" +
            "1234561234561234561234561234561234561234561234561234561234561234561234561\n" +
            "2345612345612345612345612345612345612345612345612345612345612345612345612\n" +
            "3456123456123456123456123456123456123456123456123456123456123456123456123\n" +
            "4561234561234561234561234561234561234561234561234561234561234561234561234\n" +
            "5612345612345612345612345612345612345612345612345612345612345612345612345\n" +
            "6123456123456123456123456123456123456123456123456\n";

    public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException {
        String test = testEncrypt(privateKey, data);
        System.out.println(test);
        String testDecrypt = testDecrypt(publicKey, test);
        System.out.println(testDecrypt);

    }


    /**
     * 加密
     */

    public static String testEncrypt(String key, String data) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException {
        byte[] decode = Base64.getDecoder().decode(key);
        RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure((ASN1Sequence) ASN1Sequence.fromByteArray(decode));
        RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(), asn1PrivKey.getPrivateExponent());
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        PrivateKey generatePrivate = kf.generatePrivate(rsaPrivKeySpec);
        Cipher ci = Cipher.getInstance(algorithm);
        ci.init(Cipher.ENCRYPT_MODE, generatePrivate);

        byte[] bytes = data.getBytes();
        int inputLen = bytes.length;
        int offLen = 0;//偏移量
        int i = 0;
        ByteArrayOutputStream bops = new ByteArrayOutputStream();
        while (inputLen - offLen > 0) {
            byte[] cache;
            if (inputLen - offLen > 117) {
                cache = ci.doFinal(bytes, offLen, 117);
            } else {
                cache = ci.doFinal(bytes, offLen, inputLen - offLen);
            }
            bops.write(cache);
            i++;
            offLen = 117 * i;
        }
        bops.close();
        byte[] encryptedData = bops.toByteArray();
        String encodeToString = Base64.getEncoder().encodeToString(encryptedData);
        return encodeToString;
    }


    /**
     * 解密
     */
    public static String testDecrypt(String key, String data) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, IOException {
        byte[] decode = Base64.getDecoder().decode(key);
//		PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(decode); //java底层 RSA公钥只支持X509EncodedKeySpec这种格式
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(decode);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        PublicKey generatePublic = kf.generatePublic(x509EncodedKeySpec);
        Cipher ci = Cipher.getInstance(algorithm);
        ci.init(Cipher.DECRYPT_MODE, generatePublic);

        byte[] bytes = Base64.getDecoder().decode(data);
        int inputLen = bytes.length;
        int offLen = 0;
        int i = 0;
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        while (inputLen - offLen > 0) {
            byte[] cache;
            if (inputLen - offLen > 128) {
                cache = ci.doFinal(bytes, offLen, 128);
            } else {
                cache = ci.doFinal(bytes, offLen, inputLen - offLen);
            }
            byteArrayOutputStream.write(cache);
            i++;
            offLen = 128 * i;
        }
        byteArrayOutputStream.close();
        byte[] byteArray = byteArrayOutputStream.toByteArray();
        return new String(byteArray);
    }
}