Java与C++之RSA签名与验签及加解密操作

桃扇骨 2023-01-23 12:56 7阅读 0赞

一、使用OpenSSL来生成私钥和公钥

1、执行命令openssl version -a 验证机器上已经安装openssl

2、使用openssl命令生成公私钥

openssl genrsa -out rsa_private_key.pem 1024
    openssl rsa -in rsa_private_key.pem -out rsa_public_key.pem -pubout
    openssl pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt

所有RSA流程总规则：（**私钥签名，公钥验签），（公钥加密，私钥解密）**

二、java 实现过程

1、java签名/验证签名，加解密实现

/**
         * 公钥
         */
        private static final String DEFAULT_PUBLIC_KEY="公钥\r";
    
        /**
         * 私钥
         */
        private static final String DEFAULT_PRIVATE_KEY="私钥\r";
    
        /**
         * 生成签名或密文
         */
        public String password(String data) {
            String pw = "";
            try {
                //System.out.println("---------------私钥签名过程------------------");
                //signstr = RSASignatureCommon.sign(data, DEFAULT_PRIVATE_KEY);
                //System.out.println("签名原串：" + data);
                //System.out.println("签名串：" + signstr);
                //System.out.println();
    
                //加密
                Base64 base64 = new Base64();
                RSAEncryptCommon rsaEncrypt= new RSAEncryptCommon();
                rsaEncrypt.loadPublicKey(DEFAULT_PUBLIC_KEY);//加载公钥
                byte[] cipher = rsaEncrypt.encrypt(rsaEncrypt.getPublicKey(), data.getBytes());
                pw = new String(base64.encode(cipher));
            } catch (Exception e) {
                System.err.println("错误:" + e.getMessage());
            }
    
            return pw;
        }
    
        /**
         * 解密或者验签
         */
        public String decryption(String password) {
            try {
                //RSA解密
                Base64 base64 = new Base64();
                RSAEncryptCommon rsaEncrypt= new RSAEncryptCommon();
                //加载私钥
                rsaEncrypt.loadPrivateKey(DEFAULT_PRIVATE_KEY);
    
                System.out.println("密文长度:"+ base64.decode(password).length);
                byte[] plainText = rsaEncrypt.decrypt(rsaEncrypt.getPrivateKey(), base64.decode(password));
                password = new String(plainText, "UTF-8");
                System.out.println("明文:"+ password);
    
                //System.out.println("---------------公钥校验签名------------------");
                //System.out.println("验签结果：" + RSASignatureCommon.doCheck(password, signature, DEFAULT_PUBLIC_KEY));
                //!RSASignatureCommon.doCheck(password, signature, DEFAULT_PUBLIC_KEY) ||
                //System.out.println();
    
            } catch (Exception e) {
                System.err.println(e.getMessage());
            }
    
            return password;
        }

2、JAVA rsa签名和验签方法

注意：  
    public static final String SIGN\_ALGORITHMS = "MD5WithRSA"; //根据c++端算法选择对应算法

package com.gks.auth.common;
    
    import java.security.KeyFactory;
    import java.security.PrivateKey;
    import java.security.PublicKey;
    import java.security.spec.PKCS8EncodedKeySpec;
    import java.security.spec.X509EncodedKeySpec;
    
    import org.apache.commons.codec.binary.Base64;
    
    /**
     * RSA签名验签类
     */
    public class RSASignatureCommon {
    
        /**
         * 签名算法
         * C++ EVP_md5 对应 MD5withRSA   实现Java语言MD5withRSA/SHA256withRSA/SHA384withRSA/SHA512withRSA
         */
        public static final String SIGN_ALGORITHMS = "MD5WithRSA"; //根据c++端算法选择对应算法
    
        /**
         * RSA签名
         * @param content 待签名数据
         * @param privateKey 商户私钥
         * @param encode 字符集编码
         * @return 签名值
         */
        public static String sign(String content, String privateKey, String encode) {
            try {
                Base64 base64 = new Base64();
                PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(base64.decode(privateKey));
    
                KeyFactory keyf = KeyFactory.getInstance("RSA");
                PrivateKey priKey = keyf.generatePrivate(priPKCS8);
    
                java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
    
                signature.initSign(priKey);
                signature.update(content.getBytes(encode));
    
                byte[] signed = signature.sign();
    
                return new String(base64.encode(signed));
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return null;
        }
    
        /**
         * RSA验签名检查
         * @param content 待签名数据
         * @param sign 签名值
         * @param publicKey 分配给开发商公钥
         * @param encode 字符集编码
         * @return 布尔值
         */
        public static boolean doCheck(String content, String sign, String publicKey, String encode) {
            try {
                KeyFactory keyFactory = KeyFactory.getInstance("RSA");
                Base64 base64 = new Base64();
                byte[] encodedKey = base64.decode(publicKey);
                PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
    
                java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
    
                signature.initVerify(pubKey);
                signature.update(content.getBytes(encode));
    
                boolean bverify = signature.verify(base64.decode(sign));
                return bverify;
    
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return false;
        }
    
    }

3、JAVA rsa加解密代码

注意：cipher= Cipher.getInstance("RSA/ECB/PKCS1Padding", new BouncyCastleProvider());

根据C++端的加密算法调整对应的内容RSA/ECB/PKCS1Padding

package com.gks.auth.common;
    
    import java.io.*;
    import java.security.InvalidKeyException;
    import java.security.KeyFactory;
    import java.security.KeyPair;
    import java.security.KeyPairGenerator;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    import java.security.interfaces.RSAPrivateKey;
    import java.security.interfaces.RSAPublicKey;
    import java.security.spec.InvalidKeySpecException;
    import java.security.spec.PKCS8EncodedKeySpec;
    import java.security.spec.X509EncodedKeySpec;
    
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    
    import sun.misc.BASE64Decoder;
    
    public class RSAEncryptCommon {
    
        /**
         * 私钥
         */
        private RSAPrivateKey privateKey;
    
        /**
         * 公钥
         */
        private RSAPublicKey publicKey;
    
        /**
         * RSA最大加密明文大小
         */
        private static final int MAX_ENCRYPT_BLOCK = 117;
    
        /**
         * RSA最大解密密文大小
         */
        private static final int MAX_DECRYPT_BLOCK = 128;
    
        /**
         * 字节数据转字符串专用集合
         */
        private static final char[] HEX_CHAR= {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    
        /**
         * 获取私钥
         * @return 当前的私钥对象
         */
        public RSAPrivateKey getPrivateKey() {
            return privateKey;
        }
    
        /**
         * 获取公钥
         * @return 当前的公钥对象
         */
        public RSAPublicKey getPublicKey() {
            return publicKey;
        }
    
        /**
         * 随机生成密钥对
         */
        public void genKeyPair(){
            KeyPairGenerator keyPairGen= null;
            try {
                keyPairGen= KeyPairGenerator.getInstance("RSA");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
            keyPairGen.initialize(1024, new SecureRandom());
            KeyPair keyPair= keyPairGen.generateKeyPair();
            this.privateKey= (RSAPrivateKey) keyPair.getPrivate();
            this.publicKey= (RSAPublicKey) keyPair.getPublic();
        }
    
        /**
         * 从文件中输入流中加载公钥
         * @param in 公钥输入流
         * @throws Exception 加载公钥时产生的异常
         */
        public void loadPublicKey(InputStream in) throws Exception{
            try {
                BufferedReader br= new BufferedReader(new InputStreamReader(in));
                String readLine= null;
                StringBuilder sb= new StringBuilder();
                while((readLine= br.readLine())!=null){
                    if(readLine.charAt(0)=='-'){
                        continue;
                    }else{
                        sb.append(readLine);
                        sb.append('\r');
                    }
                }
                loadPublicKey(sb.toString());
            } catch (IOException e) {
                throw new Exception("公钥数据流读取错误");
            } catch (NullPointerException e) {
                throw new Exception("公钥输入流为空");
            }
        }
    
        /**
         * 从字符串中加载公钥
         * @param publicKeyStr 公钥数据字符串
         * @throws Exception 加载公钥时产生的异常
         */
        public void loadPublicKey(String publicKeyStr) throws Exception{
            try {
                BASE64Decoder base64Decoder= new BASE64Decoder();
                byte[] buffer= base64Decoder.decodeBuffer(publicKeyStr);
                KeyFactory keyFactory= KeyFactory.getInstance("RSA");
                X509EncodedKeySpec keySpec= new X509EncodedKeySpec(buffer);
                this.publicKey= (RSAPublicKey) keyFactory.generatePublic(keySpec);
            } catch (NoSuchAlgorithmException e) {
                throw new Exception("无此算法");
            } catch (InvalidKeySpecException e) {
                throw new Exception("公钥非法");
            } catch (IOException e) {
                throw new Exception("公钥数据内容读取错误");
            } catch (NullPointerException e) {
                throw new Exception("公钥数据为空");
            }
        }
    
        /**
         * 从文件中加载私钥
         * @param in 私钥文件名
         * @return 是否成功
         * @throws Exception
         */
        public void loadPrivateKey(InputStream in) throws Exception{
            try {
                BufferedReader br= new BufferedReader(new InputStreamReader(in));
                String readLine= null;
                StringBuilder sb= new StringBuilder();
                while((readLine= br.readLine())!=null){
                    if(readLine.charAt(0)=='-'){
                        continue;
                    }else{
                        sb.append(readLine);
                        sb.append('\r');
                    }
                }
                loadPrivateKey(sb.toString());
            } catch (IOException e) {
                throw new Exception("私钥数据读取错误");
            } catch (NullPointerException e) {
                throw new Exception("私钥输入流为空");
            }
        }
    
        /**
         * 从字符串中加载私钥
         * @param privateKeyStr 私钥数据字符串
         * @throws Exception 加载私钥时产生的异常
         */
        public void loadPrivateKey(String privateKeyStr) throws Exception{
            try {
                BASE64Decoder base64Decoder= new BASE64Decoder();
                byte[] buffer= base64Decoder.decodeBuffer(privateKeyStr);
                PKCS8EncodedKeySpec keySpec= new PKCS8EncodedKeySpec(buffer);
                KeyFactory keyFactory= KeyFactory.getInstance("RSA");
                this.privateKey= (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
            } catch (NoSuchAlgorithmException e) {
                throw new Exception("无此算法");
            } catch (InvalidKeySpecException e) {
                throw new Exception("私钥非法");
            } catch (IOException e) {
                throw new Exception("私钥数据内容读取错误");
            } catch (NullPointerException e) {
                throw new Exception("私钥数据为空");
            }
        }
    
        /**
         * 加密过程
         * @param publicKey 公钥
         * @param plainTextData 明文数据
         * @return
         * @throws Exception 加密过程中的异常信息
         */
        public byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception{
            if(publicKey== null){
                throw new Exception("加密公钥为空, 请设置");
            }
            Cipher cipher= null;
            try {
                cipher = Cipher.getInstance("RSA");
                cipher.init(Cipher.ENCRYPT_MODE, publicKey);
                int inputLen = plainTextData.length;
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                int offset = 0;
                byte[] cache;
                int i = 0;
                // 对数据分段加密
                while (inputLen - offset > 0) {
                    if (inputLen - offset > MAX_ENCRYPT_BLOCK) {
                        cache = cipher.doFinal(plainTextData, offset, MAX_ENCRYPT_BLOCK);
                    } else {
                        cache = cipher.doFinal(plainTextData, offset, inputLen - offset);
                    }
                    out.write(cache, 0, cache.length);
                    i++;
                    offset = i * MAX_ENCRYPT_BLOCK;
                }
                byte[] encryptedData = out.toByteArray();
                out.close();
    
                return encryptedData;
            } catch (NoSuchAlgorithmException e) {
                throw new Exception("无此加密算法");
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
                return null;
            }catch (InvalidKeyException e) {
                throw new Exception("加密公钥非法,请检查");
            } catch (IllegalBlockSizeException e) {
                throw new Exception("明文长度非法");
            } catch (BadPaddingException e) {
                throw new Exception("明文数据已损坏");
            }
        }
    
        /**
         * 解密过程
         * @param privateKey 私钥
         * @param cipherData 密文数据
         * @return 明文
         * @throws Exception 解密过程中的异常信息
         */
        public byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception{
            if (privateKey== null){
                throw new Exception("解密私钥为空, 请设置");
            }
            Cipher cipher= null;
            try {
                cipher= Cipher.getInstance("RSA/ECB/PKCS1Padding", new BouncyCastleProvider());
                cipher.init(Cipher.DECRYPT_MODE, privateKey);
    
                int inputLen = cipherData.length;
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                int offSet = 0;
                byte[] cache;
                int i = 0;
                // 对数据分段解密
                while (inputLen - offSet > 0) {
                    if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                        cache = cipher.doFinal(cipherData, offSet, MAX_DECRYPT_BLOCK);
                    } else {
                        cache = cipher.doFinal(cipherData, offSet, inputLen - offSet);
                    }
                    out.write(cache, 0, cache.length);
                    i++;
                    offSet = i * MAX_DECRYPT_BLOCK;
                }
                byte[] decryptedData = out.toByteArray();
                out.close();
    
                return decryptedData;
            } catch (NoSuchAlgorithmException e) {
                throw new Exception("无此解密算法");
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
                return null;
            }catch (InvalidKeyException e) {
                throw new Exception("解密私钥非法,请检查");
            } catch (IllegalBlockSizeException e) {
                throw new Exception("密文长度非法");
            } catch (BadPaddingException e) {
                throw new Exception("密文数据已损坏");
            }
        }
    
    }

三、  C++实现代码

1、C++实现代码部分

std::string common_tool::url_encode(const std::string& szToEncode)
    {
        std::string src = szToEncode;
        char hex[] = "0123456789ABCDEF";
        std::string dst;
     
        for (size_t i = 0; i < src.size(); ++i)
        {
            unsigned char cc = src[i];
            if (isascii(cc))
            {
                if (cc == ' ')
                {
                    dst += "%20";
                }
                else
                    dst += cc;
            }
            else
            {
                unsigned char c = static_cast<unsigned char>(src[i]);
                dst += '%';
                dst += hex[c / 16];
                dst += hex[c % 16];
            }
        }
        return dst;
    }
     
    std::string common_tool::url_decode(const std::string &SRC) {
    	std::string ret;
    	char ch;
    	int i, ii;
    	for (i=0; i<SRC.length(); i++) {
    			if (int(SRC[i])==37) {
    					sscanf(SRC.substr(i+1,2).c_str(), "%x", &ii);
    					ch=static_cast<char>(ii);
    					ret+=ch;
    					i=i+2;
    			} else {
    					ret+=SRC[i];
    			}
    	}
    	return (ret);
    }
    bool common_tool::verify_rsa(/*const char *public_key*/RSA *rsa ,
                            const std::string &content, const std::string &sign) {
    	BIO *bufio = NULL;
    	EVP_PKEY *evpKey = NULL;
    	bool verify = false;
    	EVP_MD_CTX ctx;
    	int result = 0;
    	std::string decodedSign = common_tool::base64_decode(sign);
    	char *chDecodedSign = const_cast<char*>(decodedSign.c_str());
     
    	if (rsa == NULL) {
    			printf("PEM_read_bio_RSA_PUBKEY failed");
    			goto safe_exit;
    	}
     
    	evpKey = EVP_PKEY_new();
    	if (evpKey == NULL) {
    			printf("EVP_PKEY_new failed");
    			goto safe_exit;
    	}
     
    	if ((result = EVP_PKEY_set1_RSA(evpKey, rsa)) != 1) {
    			printf("EVP_PKEY_set1_RSA failed");
    			goto safe_exit;
    	}
     
    	EVP_MD_CTX_init(&ctx);
     
    	if (result == 1 && (result = EVP_VerifyInit_ex(&ctx,
    									EVP_md5(), NULL)) != 1) {
    			printf("EVP_VerifyInit_ex failed");
    	}
     
    	if (result == 1 && (result = EVP_VerifyUpdate(&ctx,
    									content.c_str(), content.size())) != 1) {
    			printf("EVP_VerifyUpdate failed");
    	}
     
    	if (result == 1 && (result = EVP_VerifyFinal(&ctx,
    									(unsigned char*)chDecodedSign,
    									decodedSign.size(), evpKey)) != 1) {
    			printf("EVP_VerifyFinal failed");
    	}
    	if (result == 1) {
    			verify = true;
    	} else {
    			printf("verify failed");
    	}
     
    	EVP_MD_CTX_cleanup(&ctx);
     
    	safe_exit:
    	if (rsa != NULL) {
    			RSA_free(rsa);
    			rsa = NULL;
    	}
     
    	if (evpKey != NULL) {
    			EVP_PKEY_free(evpKey);
    			evpKey = NULL;
    	}
     
    	if (bufio != NULL) {
    			BIO_free_all(bufio);
    			bufio = NULL;
    	}
     
    	return verify;
    }

2、C++签名过程：

static std::string sign(const char *private_key, 
    			const std::string &content) {
    		BIO *bufio = NULL;
    		RSA *rsa = NULL;
    		EVP_PKEY *evpKey = NULL;
    		bool verify = false;
    		EVP_MD_CTX ctx;
    		int result = 0;
    		unsigned int size = 0;
    		char *sign = NULL;
    		std::string signStr = "";
     
    		//bufio = BIO_new_mem_buf((void*)private_key, -1);
    		//if (bufio == NULL) {
    		//	ERR("BIO_new_mem_buf failed");
    		//	goto safe_exit;
    		//}
    		bufio = BIO_new(BIO_s_file());
                    BIO_read_filename(bufio, "rsa_private_key_pkcs8.pem");
                    //BIO_read_filename(bufio, "rsa_private_key.pem");
     
    		rsa = PEM_read_bio_RSAPrivateKey(bufio, NULL, NULL, NULL);
    		if (rsa == NULL) {
    			ERR("PEM_read_bio_RSAPrivateKey failed");
    			goto safe_exit;
    		}
     
    		evpKey = EVP_PKEY_new();
    		if (evpKey == NULL) {
    			ERR("EVP_PKEY_new failed");
    			goto safe_exit;
    		}
     
    		if ((result = EVP_PKEY_set1_RSA(evpKey, rsa)) != 1) {
    			ERR("EVP_PKEY_set1_RSA failed");
    			goto safe_exit;
    		}
     
    		EVP_MD_CTX_init(&ctx);
     
    		if (result == 1 && (result = EVP_SignInit_ex(&ctx, 
    						EVP_md5(), NULL)) != 1) {
    			ERR("EVP_SignInit_ex failed");
    		}
     
    		if (result == 1 && (result = EVP_SignUpdate(&ctx, 
    						content.c_str(), content.size())) != 1) {
    			ERR("EVP_SignUpdate failed");
    		}
     
    		size = EVP_PKEY_size(evpKey);
    		sign = (char*)malloc(size+1);
    		memset(sign, 0, size+1);
    		
    		if (result == 1 && (result = EVP_SignFinal(&ctx, 
    						(unsigned char*)sign,
    						&size, evpKey)) != 1) {
    			ERR("EVP_SignFinal failed");
    		}
     
    		if (result == 1) {
    			verify = true;
    		} else {
    			ERR("verify failed");
    		}
     
    		signStr = common_tool::base64_encode((const unsigned char*)sign, size);
    		EVP_MD_CTX_cleanup(&ctx);
    		free(sign);
     
    safe_exit:
    		if (rsa != NULL) {
    			RSA_free(rsa);
    			rsa = NULL;
    		}
     
    		if (evpKey != NULL) {
    			EVP_PKEY_free(evpKey);
    			evpKey = NULL;
    		}
     
    		if (bufio != NULL) {
    			BIO_free_all(bufio);
    			bufio = NULL;
    		}
     
    		return signStr;
    		//return sign;
    	}