我有一个 PEM 编码的私钥,我需要用它签署一个字符串。但是代码总是异常崩溃:
java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0c0890ba:ASN.1 encoding routines:asn1_check_tlen:WRONG_TAG
关键字符串:
-----BEGIN ENCRYPTED PRIVATE KEY-----
MIICxjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQI4P/+9mJV6RwCAggA
MBQGCCqGSIb3DQMHBAg/ZWGXeLHgeASCAoAhExhFxfcikmIKbFP0rgAlJuj1r999
... and so on...
hlgzM2p71FdC6NDVyyxbit/IzbimtJyhkRwOAnZ98yqtXWUEOx2v7CcUqiU8dSLA
K0PsaxNTUeUcQV+Z7yJk/8HxfE1ya3u2CgPXCZsWWmbxQG/+awE0eEnZ
-----END ENCRYPTED PRIVATE KEY-----
我尝试了很多变体,查看了很多答案,但结果都是一样的
编辑:在 James K Polk 的帮助下,我设法获得了私钥字节,但现在我得到了 java.security.NoSuchAlgorithmException: SecretKeyFactory PBES2 implementation not found。
修改后的代码:
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());
}
编辑:我最终使用了来自 http://commandlinefanatic.com/cgi-bin/showarticle.cgi?article=art050 的类(class):
PrivateKey privateKey = KeyImport.readPrivateKeyFile(pkFileName, privateKeyPass);
我将 keyString 保存到一个文件中,然后将其提供给 readPrivateKeyFile
最佳答案
您的私钥已根据 PKCS#8 加密,因此您需要使用 EncryptedPrivateKeyInfo
类等等。 This stackoverflow question包含一个显示如何检索它的示例。我把它变成了下面一个更完整的例子:
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,return new 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可能是有效字符串的字节。如果您必须将签名转换为字符串,那么标准方法是对其进行 base64 编码。
关于java - 使用 PEM 私钥签名字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44921731/