英文:
How to decrypt the message using private key -RSA algorithm in java
问题
以下是您提供的内容的翻译:
由于我正在使用 `.cer` 文件生成加密字符串,但无法进行解密。
要进行解密,我有一个扩展名为 **.key** 的文件,在其中以以下内容开头:
`-----BEGIN RSA PRIVATE KEY-----`
算法:`RSA/ECB/PKCS1Padding`
// 使用公钥加密会话密钥
public static String encryptSessionKey_PublicKey(String data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, CertificateException, FileNotFoundException {
FileInputStream fin = new FileInputStream("D:\\cedge_uat\\STAR_cedgenetbanking_in.cer");
CertificateFactory f = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate) f.generateCertificate(fin);
PublicKey publicKey = certificate.getPublicKey();
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] cipherData = cipher.doFinal(data.getBytes());
String encodedData = Base64.getEncoder().encodeToString(cipherData);
return encodedData;
}
但是如何使用 `.key` 文件解密上述字符串。
请帮助我。
我已经搜索了很多解决方案,但没有找到合适的方法。
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
请注意,我只提供了翻译部分,没有包括代码部分。如果您还有其他问题或需要进一步的帮助,请随时提问。
英文:
As I'm generating the encrypted string using .cer
file but unable to do decryption.
for decryption I have a file with .key extension and inside start with:
-----BEGIN RSA PRIVATE KEY-----
Algorithm:RSA/ECB/PKCS1Padding
// encrypting session key using public key
public static String encryptSessionKey_PublicKey(String data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, CertificateException, FileNotFoundException {
FileInputStream fin = new FileInputStream("D:\\cedge_uat\\STAR_cedgenetbanking_in.cer");
CertificateFactory f = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate) f.generateCertificate(fin);
PublicKey publicKey = certificate.getPublicKey();
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] cipherData = cipher.doFinal(data.getBytes());
String encodedData = Base64.getEncoder().encodeToString(cipherData);
return encodedData;
}
But how to decrypt the above string using .keyfile
.
Please help me.
I've searched many solution but unable to get proper one.
-----BEGIN RSA PRIVATE KEY-----
MIIEowIBAAKCAQEAq+vXWmbEfeQ5543Pco59x4D224g+Bqvr2dN2fkz2TsvZqm5/
nlBb7YkDcQrVIIKGX0VfzJQuFEkPAG3zIXm14cuKVDJ+ubchKPHhGtdld6xQe56K
pGyeUP7aY0iKzbd+JP99T4I9hGJC3ADs+KfLEFGa9VvVigsFnpGECN+euW95c68m
vUj3HLIztMvRbWfvzvS3GOjyBfgIXUodpuzYoUChbWz7E4J43YRJpC5RxqKPkrYi
91DLUGkGA5PMqBJCnJr8ABqwq3qikJfhIPMMUjJhZYVfhrZoIDJwBuFSOyefkcBT
rxn4oY8HjliuDq3ymWZmsslb35N8M+e99ap8cwIDAQABAoIBAH/EMPKVR1gMAeCN
KmuHbACVXmA+e2I36Hqkxf4NMkvTAXvAzQUZ0YfReIZNN6EGf9hT1WNTiH844HZA
QB1Tt5EL1EzIjhd0+qbUQ6fQBi+PFu0YIQ8bTfkBvcllQwqpYI0cdsNdFlzJLckU
wwf0o1wIWbIYwrTphg6XNFnn3q0N7Iw64IxT8LFTKsp7zbAemQO/SifZZMWdFywV
7XGyFt9roK5xfplARtJcFTsSbVlP6/Pt65lJ9xGS89Y47HOTPl5NjV0UdAxqQM3i
+OJN1JwlMsPtoZmyRTn9WK+BO9MQ4ctRIoVwyGqMwLOeufXQYTUtsRE2ENIzLWp2
F45hZ1kCgYEA1BskUczE8MLiZRfwmANE95nKyYsReEpc3wnlTUHNdN+m8RfNiHGv
2VH39Vh8lEpq92pDH1lEhHQwRnvMLCTCjFqisvNWEYOqjiSReRgazjs8QCXt6kyM
FMAsOHY4XQE9k79INems18+5I+Wz0lg3F9MZzqAXoyILdyiDNDNWloUCgYEAz3/P
A/m/iN6n8E5uhBlyvGbNFYgP9GUrcYSQfV8AbZUhfbJNps+kIIhU9/SB4YBqV0hG
nN/ng3Xr4rQZzEB52cVAs2uRks3mWU7hhSGMzpS4gI6lpY4+Pdg38nFD+a/mdPxf
GRMOyreZ67WOWTM6Mt1OSlyRiGyxJqYcD6rJJJcCgYAUfjrYHGy6xlmRYurABTDY
q2dIacNaV/T5J7+b40uyixlaGe6lzDYtTRoj/lSrDzWeignKMZnJImC3rqZfbX3O
icNGfvRF5O7JpQbZKFcOrfJ4UDHYfWTbbGXZXrK7aa9FYyna66TjhRJiQYNKQ3Ov
PZo0uIsQG+33qVZj6MHo8QKBgQCMhqJMrvdoWmKh/HwcOp/ZuEVsL5meimXBm2W/
gndnv3fPCNJOBpHA9pOU2aKcdbuPIQOxenHwNgxqnE5cZc4gDdajrFYKdidqlGFn
KDGUNmQ9rF3CoXLFr4k0SEEg+F+7Gq/M63s5Dt7PI0YkYu0nRXmgItDs86+F3Tlj
4uYWQQKBgEzystNlExDfGjKGKLQR1wawfXpg43iKc960rjGfYpbhqJVEO662oEL9
25346MPkrRcLth6ioQ5dt8Ebl4p8tSAoLe/EKk2zDUSrFUXmuFd69iH2bi0Yjunm
Ph3GafgFU0loEX+KFPyuEF6PGuSwPwOlgRNn3kXmvIbg2b/DxRyB
-----END RSA PRIVATE KEY-----
答案1
得分: 1
以下是您提供的代码的翻译部分:
private static byte[] getByteArrayFromHex(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i + 1), 16));
}
return data;
}
public static ArrayList<String> readLines(String path) throws FileNotFoundException, IOException {
ArrayList<String> res = new ArrayList<String>();
FileInputStream fis = new FileInputStream(path);
DataInputStream in = new DataInputStream(fis);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
// 逐行读取文件内容
while ((strLine = br.readLine()) != null) {
// 在控制台上打印内容
res.add(strLine);
}
// 关闭输入流
br.close();
in.close();
fis.close();
return res;
}
public static PrivateKey getPrivateKey(String privateKeyHex, String algorithm) throws NoSuchAlgorithmException, InvalidKeySpecException {
byte[] encodedPrivateKey = new byte[privateKeyHex.length()];
encodedPrivateKey = getByteArrayFromHex(privateKeyHex);
KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedPrivateKey);
PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
return privateKey;
}
public static PrivateKey loadKeyPrivateHexStr(String path, String privateKeyFile, String algorithm)
throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
String hexPrivateKey = readLines(path + privateKeyFile).get(0);
PrivateKey privateKey = getPrivateKey(hexPrivateKey, algorithm);
return privateKey;
}
private static byte[] decrypt(byte[] inpBytes, Key key, String xform) throws Exception {
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
private static String decrypt(String inpHexStr, Key key, String xform) throws Exception {
return new String(decrypt(getByteArrayFromHex(inpHexStr), key, xform));
}
public static void main(String[] args) throws NoSuchAlgorithmException, Exception {
String xform = "RSA/NONE/PKCS1PADDING";
PrivateKey prvk = loadKeyPrivateHexStr("C:\\", "/mykeyfile.key", "RSA");
String enc = ""; // 加密的字符串
// ......
// 将加密字符串加载到 enc 变量中
// ......
String dec = decrypt(enc, prvk, xform);
System.out.println(dec);
}
注意:代码的翻译可能会因为格式的不同而产生微小的变化,但逻辑和功能保持不变。
英文:
I had this lying around - hope it'll do the job for you:
private static byte[] getByteArrayFromHex(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i + 1), 16));
}
return data;
}
public static ArrayList<String> readLines(String path) throws FileNotFoundException, IOException{
ArrayList<String> res = new ArrayList<String>();
FileInputStream fis = new FileInputStream(path);
DataInputStream in = new DataInputStream(fis);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
// Print the content on the console
res.add(strLine);
}
//Close the input stream
br.close();
in.close();
fis.close();
return res;
}
public static PrivateKey getPrivateKey(String privateKeyHex, String algorithm) throws NoSuchAlgorithmException, InvalidKeySpecException {
byte[] encodedPrivateKey = new byte[privateKeyHex.length()];
encodedPrivateKey = getByteArrayFromHex(privateKeyHex);
KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(
encodedPrivateKey);
PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
return privateKey;
}
public static PrivateKey loadKeyPrivateHexStr(String path, String privateKeyFile,String algorithm)
throws IOException, NoSuchAlgorithmException,
InvalidKeySpecException {
String hexPrivateKey = readLines(path + privateKeyFile).get(0);
PrivateKey privateKey = getPrivateKey(hexPrivateKey, algorithm);
return privateKey;
}
private static byte[] decrypt(byte[] inpBytes, Key key, String xform) throws Exception {
Cipher cipher = Cipher.getInstance(xform);
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(inpBytes);
}
private static String decrypt(String inpHexStr, Key key, String xform) throws Exception {
return new String(decrypt(getByteArrayFromHex(inpHexStr), key, xform));
}
public static void main(String[] args) throws NoSuchAlgorithmException, Exception {
String xform = "RSA/NONE/PKCS1PADDING";
PrivateKey prvk = loadKeyPrivateHexStr("C:\\","/mykeyfile.key" ,"RSA")
String enc = ""; //encrypted string
......
//load encrypeted string into enc
......
String dec = decrypt(enc, prvk, xform);
System.out.println(dec);
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库,让每个人都能够通过互相帮助和分享经验来进步。
评论