英文:
How to fix error "java.security.NoSuchAlgorithmException: RSA/ECB/PKCS1Padding"
问题
我有一些已编写的公钥/私钥加密代码。当要加密的数据较短时，它能正常工作，例如："this is plain text"。
private static final String ALGORITHM = "RSA";
public static byte[] encryptWithPrivateKey(byte[] privateKey, byte[] inputData) throws Exception {
PrivateKey key = KeyFactory.getInstance(ALGORITHM).generatePrivate(new PKCS8EncodedKeySpec(privateKey));
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encryptedBytes = cipher.doFinal(inputData);
return encryptedBytes;
}
但是，当我尝试加密一个较长的字符串时，我收到了一个错误...
javax.crypto.IllegalBlockSizeException: 数据长度不能超过245字节
... 根据这个 StackOverflow 回答 ... <s>解决方法是使用算法 RSA/ECB/PKCS1Padding 而不是 RSA。</s> [更新：这个结论是不正确的。]
当我将 ALGORITHM = "RSA" 更改为 ALGORITHM = "RSA/ECB/PKCS1Padding" 时，我收到了这个错误...
"java.security.NoSuchAlgorithmException: RSA/ECB/PKCS1Padding"
如何修复这个 "NoSuchAlgorithm" 错误？
只是提供信息，我正在使用Spring Tool Suite 4（4.6.0）和Java 1.8.0_241，这些可能是与它捆绑或由Mac软件更新安装的。
英文:
I have some public/private encryption code written. It works fine when the data to be encrypted is short, example: "this is plain text".
private static final String ALGORITHM = "RSA";
public static byte[] encryptWithPrivateKey(byte[] privateKey, byte[] inputData) throws Exception {
PrivateKey key = KeyFactory.getInstance(ALGORITHM).generatePrivate(new PKCS8EncodedKeySpec(privateKey));
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encryptedBytes = cipher.doFinal(inputData);
return encryptedBytes;
}
But when I try to encrypt a much longer string, I get an error ...
javax.crypto.IllegalBlockSizeException: Data must not be longer than 245 bytes
... according to this StackOverflow answer here ... <s>the solution is to use algorithm "RSA/ECB/PKCS1Padding" instead of "RSA".</s> [UPDATE: This conclusion was incorrect.]
When I changed ALGORITHM = "RSA"; to ALGORITHM = "RSA/ECB/PKCS1Padding";, I get this error ...
"java.security.NoSuchAlgorithmException: RSA/ECB/PKCS1Padding"
How do I fix this "NoSuchAlgorithm" error?
Just FYI, I'm using Spring Tool Suite 4 (4.6.0) and Java 1.8.0_241 that either came with it or was installed by Mac software updates.
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