Golang RSA 加密解密和签名验证库

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.nio.charset.StandardCharsets; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Signature; 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 {
    // RSA encryption
    Cipher cipher = Cipher.getInstance('RSA');
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    return cipher.doFinal(plaintext);
}

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

@Override
public byte[] sign(byte[] src) throws Exception {
    // RSA signature
    Signature signature = Signature.getInstance('SHA256withRSA');
    signature.initSign(privateKey);
    signature.update(src);
    return signature.sign();
}

@Override
public boolean verify(byte[] src, byte[] sign) throws Exception {
    // RSA signature verification
    Signature signature = Signature.getInstance('SHA256withRSA');
    signature.initVerify(publicKey);
    signature.update(src);
    return signature.verify(sign);
}

public static RsaCipher generateKeyPair() throws Exception {
    // Generate RSA key pair
    KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance('RSA');
    keyPairGen.initialize(2048);
    KeyPair keyPair = keyPairGen.generateKeyPair();

    return new RsaCipher(keyPair.getPrivate(), keyPair.getPublic());
}

public static void main(String[] args) throws Exception {
    RsaCipher rsaCipher = RsaCipher.generateKeyPair();

    String plaintext = 'Hello, World!';
    byte[] ciphertext = rsaCipher.encrypt(plaintext.getBytes(StandardCharsets.UTF_8));
    byte[] decrypted = rsaCipher.decrypt(ciphertext);

    String sign = Base64.getEncoder().encodeToString(rsaCipher.sign(plaintext.getBytes(StandardCharsets.UTF_8)));
    boolean verified = rsaCipher.verify(plaintext.getBytes(StandardCharsets.UTF_8), Base64.getDecoder().decode(sign));

    System.out.println('Plaintext: ' + plaintext);
    System.out.println('Ciphertext: ' + Base64.getEncoder().encodeToString(ciphertext));
    System.out.println('Decrypted: ' + new String(decrypted, StandardCharsets.UTF_8));
    System.out.println('Signature: ' + sign);
    System.out.println('Verified: ' + verified);
}

}