RSA (hutool-码云(gitee.com))

java.lang.Object
- cn.hutool.crypto.asymmetric.BaseAsymmetric<T>
- - cn.hutool.crypto.asymmetric.AbstractAsymmetricCrypto<AsymmetricCrypto>
  - - cn.hutool.crypto.asymmetric.AsymmetricCrypto
    - - cn.hutool.crypto.asymmetric.RSA

```
public class RSA
extends AsymmetricCrypto
```
RSA公钥/私钥/签名加密解密

罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）

由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，
非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全

Author:

Looly

Field Summary
- Fields inherited from class cn.hutool.crypto.asymmetric.AsymmetricCrypto
  cipher, decryptBlockSize, encryptBlockSize
- Fields inherited from class cn.hutool.crypto.asymmetric.BaseAsymmetric
  algorithm, lock, privateKey, publicKey

Constructor Summary

Constructors
Constructor and Description
`RSA()` 构造，生成新的私钥公钥对
`RSA(BigInteger modulus, BigInteger privateExponent, BigInteger publicExponent)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
`RSA(byte[] privateKey, byte[] publicKey)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
`RSA(PrivateKey privateKey, PublicKey publicKey)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
`RSA(String rsaAlgorithm)` 构造，生成新的私钥公钥对
`RSA(String rsaAlgorithm, PrivateKey privateKey, PublicKey publicKey)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
`RSA(String privateKeyStr, String publicKeyStr)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
`RSA(String rsaAlgorithm, String privateKeyStr, String publicKeyStr)` 构造私钥和公钥同时为空时生成一对新的私钥和公钥私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`byte[]`	`decrypt(byte[] bytes, KeyType keyType)` 解密
`byte[]`	`encrypt(byte[] data, KeyType keyType)` 加密
`String`	`encryptStr(String data, KeyType keyType)` Deprecated. 请使用 `AbstractAsymmetricCrypto.encryptBcd(String, KeyType)`
`String`	`encryptStr(String data, KeyType keyType, Charset charset)` Deprecated. 请使用 `AbstractAsymmetricCrypto.encryptBcd(String, KeyType, Charset)`
`static PrivateKey`	`generatePrivateKey(BigInteger modulus, BigInteger privateExponent)` 生成RSA私钥
`static PublicKey`	`generatePublicKey(BigInteger modulus, BigInteger publicExponent)` 生成RSA公钥
`protected void`	`initCipher()` 初始化`Cipher`，默认尝试加载BC库

Methods inherited from class cn.hutool.crypto.asymmetric.AsymmetricCrypto
getAlgorithmParameterSpec, getCipher, getClipher, getDecryptBlockSize, getEncryptBlockSize, init, setAlgorithmParameterSpec, setDecryptBlockSize, setEncryptBlockSize

Methods inherited from class cn.hutool.crypto.asymmetric.AbstractAsymmetricCrypto
decrypt, decrypt, decryptFromBcd, decryptFromBcd, decryptStr, decryptStr, decryptStrFromBcd, decryptStrFromBcd, encrypt, encrypt, encrypt, encrypt, encryptBase64, encryptBase64, encryptBase64, encryptBase64, encryptBcd, encryptBcd, encryptHex, encryptHex, encryptHex, encryptHex

Methods inherited from class cn.hutool.crypto.asymmetric.BaseAsymmetric
getKeyByType, getPrivateKey, getPrivateKeyBase64, getPublicKey, getPublicKeyBase64, initKeys, setKey, setPrivateKey, setPublicKey

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RSA
```
public RSA()
```
    构造，生成新的私钥公钥对
  - RSA
```
public RSA(String rsaAlgorithm)
```
    构造，生成新的私钥公钥对
    
    Parameters:
    
    rsaAlgorithm - 自定义RSA算法，例如RSA/ECB/PKCS1Padding
  - RSA
```
public RSA(String privateKeyStr,
           String publicKeyStr)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    privateKeyStr - 私钥Hex或Base64表示
    
    publicKeyStr - 公钥Hex或Base64表示
  - RSA
```
public RSA(String rsaAlgorithm,
           String privateKeyStr,
           String publicKeyStr)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    rsaAlgorithm - 自定义RSA算法，例如RSA/ECB/PKCS1Padding
    
    privateKeyStr - 私钥Hex或Base64表示
    
    publicKeyStr - 公钥Hex或Base64表示
    
    Since:
    
    4.5.8
  - RSA
```
public RSA(byte[] privateKey,
           byte[] publicKey)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    privateKey - 私钥
    
    publicKey - 公钥
  - RSA
```
public RSA(BigInteger modulus,
           BigInteger privateExponent,
           BigInteger publicExponent)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    modulus - N特征值
    
    privateExponent - d特征值
    
    publicExponent - e特征值
    
    Since:
    
    3.1.1
  - RSA
```
public RSA(PrivateKey privateKey,
           PublicKey publicKey)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    privateKey - 私钥
    
    publicKey - 公钥
    
    Since:
    
    3.1.1
  - RSA
```
public RSA(String rsaAlgorithm,
           PrivateKey privateKey,
           PublicKey publicKey)
```
    构造
    私钥和公钥同时为空时生成一对新的私钥和公钥
    私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
    
    Parameters:
    
    rsaAlgorithm - 自定义RSA算法，例如RSA/ECB/PKCS1Padding
    
    privateKey - 私钥
    
    publicKey - 公钥
    
    Since:
    
    4.5.8
- Method Detail
  - generatePrivateKey
```
public static PrivateKey generatePrivateKey(BigInteger modulus,
                                            BigInteger privateExponent)
```
    生成RSA私钥
    
    Parameters:
    
    modulus - N特征值
    
    privateExponent - d特征值
    
    Returns:
    
    PrivateKey
  - generatePublicKey
```
public static PublicKey generatePublicKey(BigInteger modulus,
                                          BigInteger publicExponent)
```
    生成RSA公钥
    
    Parameters:
    
    modulus - N特征值
    
    publicExponent - e特征值
    
    Returns:
    
    PublicKey
  - encryptStr
```
@Deprecated
public String encryptStr(String data,
                                     KeyType keyType)
```
    Deprecated. 请使用 AbstractAsymmetricCrypto.encryptBcd(String, KeyType)
    
    分组加密
    
    Parameters:
    
    data - 数据
    
    keyType - 密钥类型
    
    Returns:
    
    加密后的密文
    
    Throws:
    
    CryptoException - 加密异常
  - encryptStr
```
@Deprecated
public String encryptStr(String data,
                                     KeyType keyType,
                                     Charset charset)
```
    Deprecated. 请使用 AbstractAsymmetricCrypto.encryptBcd(String, KeyType, Charset)
    
    分组加密
    
    Parameters:
    
    data - 数据
    
    keyType - 密钥类型
    
    charset - 加密前编码
    
    Returns:
    
    加密后的密文
    
    Throws:
    
    CryptoException - 加密异常
    
    Since:
    
    3.1.1
  - encrypt
```
public byte[] encrypt(byte[] data,
                      KeyType keyType)
```
    Description copied from class: AsymmetricCrypto
    
    加密
    
    Overrides:
    
    encrypt in class AsymmetricCrypto
    
    Parameters:
    
    data - 被加密的bytes
    
    keyType - 私钥或公钥 KeyType
    
    Returns:
    
    加密后的bytes
  - decrypt
```
public byte[] decrypt(byte[] bytes,
                      KeyType keyType)
```
    Description copied from class: AsymmetricCrypto
    
    解密
    
    Overrides:
    
    decrypt in class AsymmetricCrypto
    
    Parameters:
    
    bytes - 被解密的bytes
    
    keyType - 私钥或公钥 KeyType
    
    Returns:
    
    解密后的bytes
  - initCipher
```
protected void initCipher()
```
    Description copied from class: AsymmetricCrypto
    
    初始化Cipher，默认尝试加载BC库
    
    Overrides:
    
    initCipher in class AsymmetricCrypto

Class RSA

Field Summary

Fields inherited from class cn.hutool.crypto.asymmetric.AsymmetricCrypto

Fields inherited from class cn.hutool.crypto.asymmetric.BaseAsymmetric

Constructor Summary

Method Summary

Methods inherited from class cn.hutool.crypto.asymmetric.AsymmetricCrypto

Methods inherited from class cn.hutool.crypto.asymmetric.AbstractAsymmetricCrypto

Methods inherited from class cn.hutool.crypto.asymmetric.BaseAsymmetric

Methods inherited from class java.lang.Object

Constructor Detail

RSA

RSA

RSA

RSA

RSA

RSA

RSA

RSA

Method Detail

generatePrivateKey

generatePublicKey

encryptStr

encryptStr

encrypt

decrypt

initCipher