javarsa代码 java代码例子讲解( 八 ) _加密

// 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;
private KeyFactory keyFactory;
public RSAUtils() throws NoSuchAlgorithmException {
keyFactory = KeyFactory.getInstance(ALGORITHM);
}
/**
* 私钥加密
*
* @param content待加密字符串
* @param privateKey 私钥
* @return 加密后字符串（BASE64编码）
*/
public String encryptByPrivateKey(String content, String privateKey) throws Exception {
String result;
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
byte[] keyBytes = new Base64().decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
PrivateKey pKey = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, pKey);
byte[] data = https://www.04ip.com/post/content.getBytes(CHARSET);
write2Stream(cipher, data, out);
byte[] resultBytes = out.toByteArray();
result = Base64.encodeBase64String(resultBytes);
} catch (Exception e) {
throw new Exception(e);
}
return result;
}
/**
* 公钥解密
*
* @param content已加密字符串（BASE64加密）
* @param publicKey 公钥
* @return
*/
public String decryptByPublicKey(String content, String publicKey) throws Exception {
String result = "";
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
byte[] keyBytes = new Base64().decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
PublicKey pKey = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, pKey);
byte[] data = https://www.04ip.com/post/Base64.decodeBase64(content);
write2Stream(cipher, data, out);
byte[] resultBytes = out.toByteArray();
result = new String(resultBytes);
} catch (Exception e) {
throw new Exception(e);
}
return result;
}
/**
* 公钥加密
*
* @param content待加密字符串
* @param publicKey 公钥
* @return 加密后字符串（BASE64编码）
*/
public String encryptByPublicKey(String content, String publicKey) throws Exception {
String result = "";
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
byte[] keyBytes = new Base64().decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
PublicKey pKey = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, pKey);
byte[] data = https://www.04ip.com/post/content.getBytes(CHARSET);
write2Stream(cipher,
data, out);
byte[] resultBytes = out.toByteArray();
result = Base64.encodeBase64String(resultBytes);
} catch (Exception e) {
throw new Exception(e);
}
return result;
}
/**
* 私钥解密
*
* @param content已加密字符串
* @param privateKey 私钥
* @return 解密后字符串
*/
public String decryptByPrivateKey(String content, String privateKey) throws Exception {
String result = "";
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
byte[] keyBytes = new Base64().decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
PrivateKey pKey = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, pKey);
byte[] data = https://www.04ip.com/post/Base64.decodeBase64(content);
write2Stream(cipher, data, out);
byte[] resultBytes = out.toByteArray();

javarsa代码 java代码例子讲解( 八 )

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