企业微信会话存解密问题： 报错信息：too much data for RSA block？
public static String decryptRSA(String str, String privateKey) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
rsa.init(Cipher.DECRYPT_MODE, getPrivateKey(privateKey));
byte[] s = Base64.decodeBase64(str);
byte[] utf8 = rsa.doFinal(s); // 这行报错
String result = new String(utf8,"UTF-8");
return result;
}
public static PrivateKey getPrivateKey (String privateKey) throws Exception {
Reader privateKeyReader = new StringReader(privateKey);
PEMParser privatePemParser = new PEMParser(privateKeyReader);
Object privateObject = privatePemParser.readObject();
if (privateObject instanceof PEMKeyPair) {
PEMKeyPair pemKeyPair = (PEMKeyPair) privateObject;
JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
PrivateKey privKey = converter.getPrivateKey(pemKeyPair.getPrivateKeyInfo());
return privKey;
}
return null;
}
