问题描述
我有一个PEM编码的私钥，我需要用它签名一个字符串.但是代码不断崩溃，并带有异常:
I have a PEM-encoded private key and I need to sign a string with it. But the code keeps crashing with exception:
java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0c0890ba:ASN.1 encoding routines:asn1_check_tlen:WRONG_TAG
密钥字符串:
-----BEGIN ENCRYPTED PRIVATE KEY-----
MIICxjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQI4P/+9mJV6RwCAggA
MBQGCCqGSIb3DQMHBAg/ZWGXeLHgeASCAoAhExhFxfcikmIKbFP0rgAlJuj1r999
... and so on...
hlgzM2p71FdC6NDVyyxbit/IzbimtJyhkRwOAnZ98yqtXWUEOx2v7CcUqiU8dSLA
K0PsaxNTUeUcQV+Z7yJk/8HxfE1ya3u2CgPXCZsWWmbxQG/+awE0eEnZ
-----END ENCRYPTED PRIVATE KEY-----
我尝试了许多变体，通过许多答案进行了研究，但结果却是相同的
I've tried many variants, looked through many answers, but the results were the same
在James K Polk的帮助下，我设法获得了私钥字节，但是现在我得到了 java.security.NoSuchAlgorithmException:未找到SecretKeyFactory PBES2实现.修改后的代码:
with James K Polk's help I've managed to get private key bytes, but now I get java.security.NoSuchAlgorithmException: SecretKeyFactory PBES2 implementation not found. Modified code:
private String sign(String dataString, String pkString, String privateKeyPass) throws Exception {
pkString = pkString.replace("-----BEGIN ENCRYPTED PRIVATE KEY-----", "");
pkString = pkString.replace("-----END ENCRYPTED PRIVATE KEY-----", "");
pkString = pkString.replaceAll("\\s+","");
byte[] privateKeyBytes = decryptPrivateKey(Base64.decode(pkString, Base64.DEFAULT), privateKeyPass);
KeyFactory kf = KeyFactory.getInstance("RSA");
PrivateKey privateKey = kf.generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));
Signature instance = Signature.getInstance("SHA1withRSA");
instance.initSign(privateKey);
instance.update(dataString.getBytes(UTF_8));
return Base64.encodeToString(instance.sign(), Base64.DEFAULT);
}
public static byte[] decryptPrivateKey(byte[] key, String pass) throws Exception {
PBEKeySpec passKeySpec = new PBEKeySpec(pass.toCharArray());
EncryptedPrivateKeyInfo encryptedKey = new EncryptedPrivateKeyInfo(key);
Timber.w("encryptedKey.getAlgName(): %s", encryptedKey.getAlgName());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(encryptedKey.getAlgName());//PBES2
SecretKey passKey = keyFac.generateSecret(passKeySpec);
// Create PBE Cipher
Cipher pbeCipher = Cipher.getInstance(encryptedKey.getAlgName());
// Initialize PBE Cipher with key and parameters
pbeCipher.init(Cipher.DECRYPT_MODE, passKey, encryptedKey.getAlgParameters());
// Decrypt the private key
return pbeCipher.doFinal(encryptedKey.getEncryptedData());
}
我最终使用了
PrivateKey privateKey = KeyImport.readPrivateKeyFile(pkFileName, privateKeyPass);
我将keyString保存到文件中，然后将其输入到readPrivateKeyFile
I save keyString into a file and then feed it to readPrivateKeyFile
推荐答案
您的私钥已根据PKCS#8进行了加密，因此您需要使用 EncryptedPrivateKeyInfo 类.此stackoverflow问题包含一个显示如何检索它的示例.我已将其变成下面更完整的示例:
Your private key is encrypted according PKCS#8, so you need to use the EncryptedPrivateKeyInfo class among others. This stackoverflow question contains an example showing how to retrieve it. I have turned it into a more complete example below:
import javax.crypto.Cipher;
import javax.crypto.EncryptedPrivateKeyInfo;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;
import java.util.List;
public class Main {
private static byte [] pemFileToBytes(String filename) throws IOException {
// read in PEM file, throw away the begin and end lines
List<String> pemLines = Files.readAllLines(Paths.get(filename), StandardCharsets.US_ASCII);
pemLines.remove(0);
pemLines.remove(pemLines.size() - 1);
String pem = String.join("", pemLines);
// base64 decode and return the result.
return Base64.getDecoder().decode(pem);
}
private static PrivateKey parsePrivateKey (String filename, char [] password) throws Exception{
PBEKeySpec passKeySpec = new PBEKeySpec(password); //my password
EncryptedPrivateKeyInfo encryptedKey = new EncryptedPrivateKeyInfo(pemFileToBytes(filename));
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(encryptedKey.getAlgName());
SecretKey passKey = keyFac.generateSecret(passKeySpec);
// Create PBE Cipher
Cipher pbeCipher = Cipher.getInstance(encryptedKey.getAlgName());
// Initialize PBE Cipher with key and parameters
pbeCipher.init(Cipher.DECRYPT_MODE, passKey, encryptedKey.getAlgParameters());
// Decrypt the private key
byte [] encodedPrivateKey = pbeCipher.doFinal(encryptedKey.getEncryptedData());
PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePrivate(privateKeySpec);
}
public static void main(String[] args) throws Exception {
PrivateKey pk = parsePrivateKey("x.pk8", "pass".toCharArray());
}
}
最后一行，返回新的String(instance.sign()，UTF_8); 没有任何意义，因为 Signature.sign()返回一个数组在任何字符集中都不太可能是有效字符串的字节.如果必须将签名转换为字符串，则标准方法是对它进行base64编码.
You last line, return new String(instance.sign(), UTF_8); doesn't make any sense as Signature.sign() returns an array of bytes that is not likely to be a valid string in any character set. If you must convert the signature to a string then the standard way is to base64 encode it.
这篇关于使用PEM PrivateKey签名字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！