Android中的RSA加密解密 [英] RSA Encryption Decryption in Android
本文介绍了Android中的RSA加密解密的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
>> java.security.InvalidKeyException：传递给RSA的未知密钥类型。 KeyPairGenerator kpg;
KeyPair kp;
PublicKey publicKey;
PrivateKey privateKey;
byte [] encryptedBytes，decryptledBytes;
密码密码，密码1;
加密，解密的字符串
public String RSAEncrypt（final String plain）throws NoSuchAlgorithmException，NoSuchPaddingException，InvalidKeyException，IllegalBlockSizeException，BadPaddingException
{
kpg = KeyPairGenerator.getInstance（RSA）;
kpg.initialize（1024）;
kp = kpg.genKeyPair（）;
publicKey = kp.getPublic（）;
privateKey = kp.getPrivate（）;
cipher = Cipher.getInstance（RSA）;
cipher.init（Cipher.ENCRYPT_MODE，publicKey）;
encryptedBytes = cipher.doFinal（plain.getBytes（））;
encrypted = new String（encryptedBytes）;
System.out.println（EEncrypted ?????+加密）;
返回加密;
}
public String RSADecrypt（final String result）throws NoSuchAlgorithmException，NoSuchPaddingException，InvalidKeyException，IllegalBlockSizeException，BadPaddingException
{
cipher1 = Cipher.getInstance（ RSA）;
cipher1.init（Cipher.DECRYPT_MODE，privateKey）;
decryptedBytes = cipher1.doFinal（result.getBytes（））;
decryptpted = new String（decryptptedBytes）;
System.out.println（DDecrypted ?????+解密）;
返回解密;
}
我从这里调用函数：
encrypt.setOnClickListener（new OnClickListener（）
{
public void onClick（View arg0）
{
try
{
RSAEncrypt rsaencrypt = new RSAEncrypt（）;
rsaencrypt.RSAEncrypt（name）;
result = rsaencrypt.RSAEncrypt（name）;
Toast.makeText（getBaseContext（），result.toString（），Toast.LENGTH_SHORT）.show（）;
System.out.println（Result：+ result）;
}
catch（异常e）
{
e.printStackTrace（）;
Toast.makeText（getBaseContext（），e.toString（），Toast.LENGTH_LONG） .show（）;
}
}
}）;
decrypt.setOnClickListener（new OnClickListener（）
{
public void onClick（View arg0）
{
{
try
{
RSAEncrypt rsadecrypt = new RSAEncrypt（）;
rsadecrypt.RSADecrypt（result）;
ans = rsadecrypt.RSADecrypt（result）;
System.out.println（Result is+ ans）;
Toast.makeText（getBaseContext（），ans.toString（），Toast.LENGTH_LONG）.show（）;
}
catch（Exception e）
{
e.printStackTrace（）;
Toast.makeText（getBaseContext（），e.toString（），Toast.LENGTH_LONG）.show（）;
System.out.println（Exception is>>+ e）;
}
}
}）;
解决方案
在RSA中，您应该使用公钥进行加密，用于解密的私钥。
您的示例代码用于加密和解密公钥 - 这不行。
因此在解密部分你应该以这种方式初始化密码：
cipher1.init（Cipher.DECRYPT_MODE，privateKey）;
进一步你的代码有一个第二个重要的错误：
从不将二进制数据转换为String！
>字符串用于字符串字符，而不是二进制数据。如果要将二进制数据打包成字符串，将其编码为可打印字符，例如使用Hex或Base64。
以下示例使用十六进制编码器， org.apache.common.codec 包 - 必须安装的第三方库。
public byte [] RSAEncrypt（final String plain）throws NoSuchAlgorithmException，NoSuchPaddingException，
InvalidKeyException，IllegalBlockSizeException，BadPaddingException {
kpg = KeyPairGenerator.getInstance （ RSA）;
kpg.initialize（1024）;
kp = kpg.genKeyPair（）;
publicKey = kp.getPublic（）;
privateKey = kp.getPrivate（）;
cipher = Cipher.getInstance（RSA）;
cipher.init（Cipher.ENCRYPT_MODE，publicKey）;
encryptedBytes = cipher.doFinal（plain.getBytes（））;
System.out.println（EEncrypted ?????+ org.apache.commons.codec.binary.Hex.encodeHexString（encryptedBytes））;
返回encryptedBytes;
public String RSADecrypt（final byte [] encryptedBytes）throws NoSuchAlgorithmException，NoSuchPaddingException，
InvalidKeyException，IllegalBlockSizeException，BadPaddingException {
cipher1 = Cipher。的getInstance（ RSA）;
cipher1.init（Cipher.DECRYPT_MODE，privateKey）;
decryptptedBytes = cipher1.doFinal（encryptedBytes）;
decryptpted = new String（decryptptedBytes）;
System.out.println（DDecrypted ?????+解密）;
返回解密;
}
I am implementing a demo for RSA Encryption and Decryption in Android. I can Perform Encryption very well, but In Decryption I get an Exception: >>java.security.InvalidKeyException: unknown key type passed to RSA.
KeyPairGenerator kpg;
KeyPair kp;
PublicKey publicKey;
PrivateKey privateKey;
byte [] encryptedBytes,decryptedBytes;
Cipher cipher,cipher1;
String encrypted,decrypted;
public String RSAEncrypt (final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
kp = kpg.genKeyPair();
publicKey = kp.getPublic();
privateKey = kp.getPrivate();
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedBytes = cipher.doFinal(plain.getBytes());
encrypted = new String(encryptedBytes);
System.out.println("EEncrypted?????"+encrypted);
return encrypted;
}
public String RSADecrypt (final String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
cipher1=Cipher.getInstance("RSA");
cipher1.init(Cipher.DECRYPT_MODE, privateKey);
decryptedBytes = cipher1.doFinal(result.getBytes());
decrypted = new String(decryptedBytes);
System.out.println("DDecrypted?????"+decrypted);
return decrypted;
}
And I am calling the function from here:
encrypt.setOnClickListener(new OnClickListener()
{
public void onClick(View arg0)
{
try
{
RSAEncrypt rsaencrypt=new RSAEncrypt();
rsaencrypt.RSAEncrypt(name);
result=rsaencrypt.RSAEncrypt(name);
Toast.makeText(getBaseContext(), result.toString(),Toast.LENGTH_SHORT).show();
System.out.println("Result:"+result);
}
catch(Exception e)
{
e.printStackTrace();
Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
}
}
});
decrypt.setOnClickListener(new OnClickListener()
{
public void onClick(View arg0)
{
{
try
{
RSAEncrypt rsadecrypt=new RSAEncrypt();
rsadecrypt.RSADecrypt(result);
ans=rsadecrypt.RSADecrypt(result);
System.out.println("Result is"+ans);
Toast.makeText(getBaseContext(), ans.toString(),Toast.LENGTH_LONG).show();
}
catch(Exception e)
{
e.printStackTrace();
Toast.makeText(getBaseContext(), e.toString(),Toast.LENGTH_LONG).show();
System.out.println("Exception is>>"+e);
}
}
});
解决方案
In RSA you should use the public key for encryption and the private key for decryption.
Your sample code uses for encryption and decryption the public key - this can not work.
Hence in the decryption part you should initialize the cipher this way:
cipher1.init(Cipher.DECRYPT_MODE, privateKey);
Furthermor your code has a second significant bug:
You are converting a byte array with binary content to a String.
Never ever convert binary data to a String!
Strings are for string characters, not binary data. If you want to pack binary data into a String encode it to printable characters for example using Hex or Base64.
The following example uses the hexadecimal encoder fro org.apache.common.codec package - a third party library with has to be installed.
public byte[] RSAEncrypt(final String plain) throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
kp = kpg.genKeyPair();
publicKey = kp.getPublic();
privateKey = kp.getPrivate();
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedBytes = cipher.doFinal(plain.getBytes());
System.out.println("EEncrypted?????" + org.apache.commons.codec.binary.Hex.encodeHexString(encryptedBytes));
return encryptedBytes;
}
public String RSADecrypt(final byte[] encryptedBytes) throws NoSuchAlgorithmException, NoSuchPaddingException,
InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
cipher1 = Cipher.getInstance("RSA");
cipher1.init(Cipher.DECRYPT_MODE, privateKey);
decryptedBytes = cipher1.doFinal(encryptedBytes);
decrypted = new String(decryptedBytes);
System.out.println("DDecrypted?????" + decrypted);
return decrypted;
}
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