RSA加密解密和签名验证库：Go语言实现

package crypto

import ( 'crypto' 'crypto/rand' 'crypto/rsa' 'crypto/x509' 'encoding/base64' 'encoding/pem' 'errors' 'github.com/containous/traefik/v2/pkg/log' )

type pkcsClient struct { privateKey *rsa.PrivateKey publicKey *rsa.PublicKey }

type Type int64

const ( PKCS1 Type = iota PKCS8 )

func (this *pkcsClient) Encrypt(plaintext []byte) ([]byte, error) { return rsa.EncryptPKCS1v15(rand.Reader, this.publicKey, plaintext) } func (this *pkcsClient) Decrypt(ciphertext []byte) ([]byte, error) { return rsa.DecryptPKCS1v15(rand.Reader, this.privateKey, ciphertext) }

func (this *pkcsClient) Sign(src []byte, hash crypto.Hash) ([]byte, error) { h := hash.New() h.Write(src) hashed := h.Sum(nil) return rsa.SignPKCS1v15(rand.Reader, this.privateKey, hash, hashed) }

func (this *pkcsClient) Verify(src []byte, sign []byte, hash crypto.Hash) error { h := hash.New() h.Write(src) hashed := h.Sum(nil) return rsa.VerifyPKCS1v15(this.publicKey, hash, hashed, sign) }

type Cipher interface { Encrypt(plaintext []byte) ([]byte, error) Decrypt(ciphertext []byte) ([]byte, error) Sign(src []byte, hash crypto.Hash) ([]byte, error) Verify(src []byte, sign []byte, hash crypto.Hash) error }

//默认客户端，pkcs8私钥格式，pem编码 func NewDefault(privateKey, publicKey string) (Cipher, error) { blockPri, _ := pem.Decode([]byte(privateKey)) if blockPri == nil { return nil, errors.New('private key error') }

blockPub, _ := pem.Decode([]byte(publicKey))
if blockPub == nil {
	return nil, errors.New('public key error')
}

return NewRsa(blockPri.Bytes, blockPub.Bytes, PKCS8)

}

func NewRsa(privateKey, publicKey []byte, privateKeyType Type) (Cipher, error) {

priKey, err := genPriKey(privateKey, privateKeyType)
if err != nil {
	return nil, err
}
pubKey, err := genPubKey(publicKey)
if err != nil {
	return nil, err
}
return &pkcsClient{privateKey: priKey, publicKey: pubKey}, nil

}

func genPubKey(publicKey []byte) (*rsa.PublicKey, error) { pub, err := x509.ParsePKIXPublicKey(publicKey) if err != nil { return nil, err } return pub.(*rsa.PublicKey), nil }

func genPriKey(privateKey []byte, privateKeyType Type) (*rsa.PrivateKey, error) { var priKey *rsa.PrivateKey var err error switch privateKeyType { case PKCS1: { priKey, err = x509.ParsePKCS1PrivateKey([]byte(privateKey)) if err != nil { return nil, err } } case PKCS8: { prkI, err := x509.ParsePKCS8PrivateKey([]byte(privateKey)) if err != nil { return nil, err } priKey = prkI.(*rsa.PrivateKey) } default: { return nil, errors.New('unsupport private key type') } } return priKey, nil }

func KeyPair() (priKey, pubKey string, err error) { privateKey, err := rsa.GenerateKey(rand.Reader, 2048) if err != nil { log.WithoutContext().Errorln(err) return } priKey = base64.StdEncoding.EncodeToString(x509.MarshalPKCS1PrivateKey(privateKey))

// 生成公钥文件
publicKey := &privateKey.PublicKey
derPkix, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
	log.WithoutContext().Errorln(err)
	return
}
pubKey = base64.StdEncoding.EncodeToString(derPkix)
return

} func KeyPairPem() (priKey, pubKey string, err error) { privateKey, err := rsa.GenerateKey(rand.Reader, 2048) if err != nil { return '', '', err } var pemPrivateBlock = &pem.Block{ Type: 'RSA PRIVATE KEY', Bytes: x509.MarshalPKCS1PrivateKey(privateKey), } priKey = string(pem.EncodeToMemory(pemPrivateBlock))

// 生成公钥文件
publicKey := &privateKey.PublicKey
derPkix, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
	return '', '', err
}
block := &pem.Block{
	Type:  'RSA PRIVATE KEY',
	Bytes: derPkix,
}
pubKey = string(pem.EncodeToMemory(block))
return priKey, pubKey, nil

}

转为java内容：package crypto;

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.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher; import java.util.Base64;

public class RsaCipher implements Cipher { private PrivateKey privateKey; private PublicKey publicKey;

public RsaCipher(PrivateKey privateKey, PublicKey publicKey) {
	this.privateKey = privateKey;
	this.publicKey = publicKey;
}

@Override
public byte[] encrypt(byte[] plaintext) throws Exception {
	Cipher cipher = Cipher.getInstance('RSA');
	cipher.init(Cipher.ENCRYPT_MODE, publicKey);
	return cipher.doFinal(plaintext);
}

@Override
public byte[] decrypt(byte[] ciphertext) throws Exception {
	Cipher cipher = Cipher.getInstance('RSA');
	cipher.init(Cipher.DECRYPT_MODE, privateKey);
	return cipher.doFinal(ciphertext);
}

@Override
public byte[] sign(byte[] src) throws Exception {
	Cipher cipher = Cipher.getInstance('RSA');
	cipher.init(Cipher.ENCRYPT_MODE, privateKey);
	return cipher.doFinal(src);
}

@Override
public boolean verify(byte[] src, byte[] sign) throws Exception {
	Cipher cipher = Cipher.getInstance('RSA');
	cipher.init(Cipher.DECRYPT_MODE, publicKey);
	byte[] decryptedSign = cipher.doFinal(sign);
	return MessageDigest.isEqual(src, decryptedSign);
}

public static Cipher newInstance(String privateKey, String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException {
	byte[] privateKeyBytes = Base64.getDecoder().decode(privateKey);
	byte[] publicKeyBytes = Base64.getDecoder().decode(publicKey);

	KeyFactory keyFactory = KeyFactory.getInstance('RSA');
	PrivateKey privateKeyObj = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));
	PublicKey publicKeyObj = keyFactory.generatePublic(new X509EncodedKeySpec(publicKeyBytes));

	return new RsaCipher(privateKeyObj, publicKeyObj);
}

}

public interface Cipher { byte[] encrypt(byte[] plaintext) throws Exception;

byte[] decrypt(byte[] ciphertext) throws Exception;

byte[] sign(byte[] src) throws Exception;

boolean verify(byte[] src, byte[] sign) throws Exception;

}

public class Main { public static void main(String[] args) { String privateKey = 'your_private_key'; String publicKey = 'your_public_key';

	try {
		Cipher cipher = RsaCipher.newInstance(privateKey, publicKey);

		String plaintext = 'Hello, world!';
		byte[] encrypted = cipher.encrypt(plaintext.getBytes());
		byte[] decrypted = cipher.decrypt(encrypted);
		System.out.println('Decrypted: ' + new String(decrypted));

		byte[] signature = cipher.sign(plaintext.getBytes());
		boolean verified = cipher.verify(plaintext.getBytes(), signature);
		System.out.println('Verified: ' + verified);
	} catch (Exception e) {
		e.printStackTrace();
	}
}