[英]Difference between PKCS1-padding/RSA encryption ios objc and java
[英]RSA Encryption Padding issues between Python and Java
我正在嘗試使用由 android 中的客戶端生成的公鑰對 python 中的一些數據進行 RSA 加密。 加密成功(至少沒有例外)。 但是,當嘗試使用 android 中的私鑰解密數據時,它會引發錯誤的填充異常。
相關代碼:
在 Android 中生成 RSA 密鑰對。 android 中包含一個充氣城堡的簡化版本:
import javax.crypto.KeyGenerator;
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(2048);
return kpg.generateKeyPair();
Python 中的加密:
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
import base64
from Crypto.Hash import SHA256
# key contains the public key string without any line breaks.
def encrypt(keyString, plainText)
key = key.replace('-----BEGIN PUBLIC KEY-----', '')
key = key.replace('-----END PUBLIC KEY-----', '');
pubkey = RSA.importKey(base64.b64decode(key))
cipher = PKCS1_OAEP.new(pubkey, hashAlgo=SHA256)
encrypted = cipher.encrypt(plaintext)
return base64.b64encode(encrypted)
print encrypt('-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7fJDt9my7WTnPahyw9JvIwm/q3F9jF9R2qNv01Os5NhBUgWOha67DlalOhQmQYBosnXfTWm6JQF2upnBInFGUOZx+10UVnuUbTpUT004lBfNbHx23rrf66b48Q25OoDnbWM3xWD8+9GPvoLO3ftJSbcjb+euzVJOkJYNo33dnG0yZ4LWHLBMog7OgbnjjobiM+O/0wzmiW8VE7gCrg7ZyGpxHXo9ACJytKjC4Hg976Ryg1wyrD2dmgiV212CcBGdzj7F6xn1Uyk7DTeAOgQJHLDFr+2sHgcXJXyslrjvCp3Om2CbzDY9W8XaU2A/84Q1Ejt8ljtJZBOJCuH+ARqZRwIDAQAB-----END PUBLIC KEY-----', 'this is a test string')
Android中的解密。 android 中包含一個充氣城堡的簡化版本:
相關進口:
import javax.crypto.Cipher;
import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PSource;
import java.security.spec.MGF1ParameterSpec;
import java.util.*;
import android.util.Base64;
解密:
private static String RSA_CONFIGURATION = "RSA/ECB/OAEPWithSHA-256AndMGF1Padding";
private static String RSA_PROVIDER = "BC";
public static decrypt(Key key, String encryptedString){
Cipher c = Cipher.getInstance(RSA_CONFIGURATION, RSA_PROVIDER);
c.init(Cipher.DECRYPT_MODE, key, new OAEPParameterSpec("SHA-256", "MGF1", MGF1ParameterSpec.SHA1,
PSource.PSpecified.DEFAULT));
byte[] decodedBytes = c.doFinal(Base64.decode(base64cypherText.getBytes("UTF-8"), Base64.DEFAULT));
clearText = new String(decodedBytes, "UTF-8");
}
例外 :
javax.crypto.BadPaddingException: data hash wrong
at com.android.org.bouncycastle.jcajce.provider.asymmetric.rsa.CipherSpi.engineDoFinal(CipherSpi.java:478)
at javax.crypto.Cipher.doFinal(Cipher.java:1204)
at org.ambientdynamix.security.CryptoUtils.decryptRsa(CryptoUtils.java:204)
測試鍵:
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7fJDt9my7WTnPahyw9JvIwm/q3F9jF9R2qNv01Os5NhBUgWOha67DlalOhQmQYBosnXfTWm6JQF2upnBInFGUOZx+10UVnuUbTpUT004lBfNbHx23rrf66b48Q25OoDnbWM3xWD8+9GPvoLO3ftJSbcjb+euzVJOkJYNo33dnG0yZ4LWHLBMog7OgbnjjobiM+O/0wzmiW8VE7gCrg7ZyGpxHXo9ACJytKjC4Hg976Ryg1wyrD2dmgiV212CcBGdzj7F6xn1Uyk7DTeAOgQJHLDFr+2sHgcXJXyslrjvCp3Om2CbzDY9W8XaU2A/84Q1Ejt8ljtJZBOJCuH+ARqZRwIDAQAB-----END PUBLIC KEY-----
OAEP 填充有兩個參數:
我在 Java 中看到你使用 SHA-256 和 MGF1 和 SHA-1 哈希。 它們必須與 Python 使用的參數不匹配。
Python 和 Java 的區別在於 Python 代碼使用相同的摘要進行消息摘要和掩碼摘要。 而 Java(Sun 提供者和 BouncyCastle 提供者)默認使用 SHA-1 進行掩碼消化。 所以需要明確指定所有參數:
byte[] cipherTextBytes = DatatypeConverter.parseBase64Binary(cipherText);
byte[] privateKeyBytes = DatatypeConverter.parseBase64Binary(privateKeyStr);
KeyFactory kf = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(privateKeyBytes);
PrivateKey privateKey = kf.generatePrivate(ks);
Cipher c = Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
c.init(Cipher.DECRYPT_MODE, privateKey, new OAEPParameterSpec("SHA-256",
"MGF1", MGF1ParameterSpec.SHA256, PSource.PSpecified.DEFAULT));
byte[] plainTextBytes = c.doFinal(cipherTextBytes);
String plainText = new String(plainTextBytes);
System.out.println(plainText);
處理這個問題的另一種方法:
默認情況下, mgfunc
與hashAlgo
一致
所以,我們可以像這樣更改mgfunc
:
cipher = PKCS1_OAEP.new(pubkey, hashAlgo=SHA256,mgfunc=lambda x,y:MGF1(x,y,SHA1))
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