package com.xxxxx.loan.domain.encryption;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.util.Date;
import java.util.Iterator;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPCompressedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedData;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataList;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPLiteralDataGenerator;
import org.bouncycastle.openpgp.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPOnePassSignature;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPSignature;
import org.bouncycastle.openpgp.PGPSignatureGenerator;
import org.bouncycastle.openpgp.PGPSignatureSubpacketGenerator;
import org.bouncycastle.openpgp.PGPUtil;
import org.bouncycastle.openpgp.operator.bc.BcKeyFingerprintCalculator;
import org.bouncycastle.openpgp.operator.bc.BcPGPContentSignerBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPGPDataEncryptorBuilder;
import org.bouncycastle.openpgp.operator.bc.BcPublicKeyDataDecryptorFactory;
import org.bouncycastle.openpgp.operator.bc.BcPublicKeyKeyEncryptionMethodGenerator;
import org.bouncycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
import org.bouncycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.bouncycastle.util.io.Streams;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import lombok.extern.log4j.Log4j2;
@Log4j2
@Component
public class Main {
@Value("${fs.pgp.private.key}")
private String privateKeyPath;
private static final int DEFAULT_BUFFER_SIZE = 16 * 1024;
public String decryptRequest(String data, String publiKey) throws Exception {
InputStream inputStream = PGPUtil.getDecoderStream(new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8)));
InputStream privateKey = new BufferedInputStream(new FileInputStream(privateKeyPath));
InputStream publicKey = new BufferedInputStream(new FileInputStream(publiKey));
byte[] decryptedBytes = decryptAndVerify(inputStream, privateKey, publicKey);
return new String(decryptedBytes);
}
public static final byte[] decryptAndVerify(InputStream is, InputStream verifyKey, InputStream decryptKey)
throws Exception {
PGPObjectFactory pgpF = new PGPObjectFactory(is, new BcKeyFingerprintCalculator());
PGPEncryptedDataList enc = (PGPEncryptedDataList) pgpF.nextObject();
Iterator<?> it = enc.getEncryptedDataObjects();
PGPPrivateKey sKey = null;
PGPPublicKeyEncryptedData pbe = null;
while (sKey == null && it.hasNext()) {
pbe = (PGPPublicKeyEncryptedData) it.next();
sKey = findPrivateKey(verifyKey, pbe.getKeyID());
}
InputStream clear = pbe.getDataStream(new BcPublicKeyDataDecryptorFactory(sKey));
PGPObjectFactory plainFact = new PGPObjectFactory(clear, new BcKeyFingerprintCalculator());
PGPCompressedData compressedData = null;
Object message = plainFact.nextObject();
ByteArrayOutputStream actualOutput = new ByteArrayOutputStream();
while (message != null) {
if (message instanceof PGPCompressedData) {
compressedData = (PGPCompressedData) message;
plainFact = new PGPObjectFactory(compressedData.getDataStream(), new BcKeyFingerprintCalculator());
message = plainFact.nextObject();
} else if (message instanceof PGPLiteralData) {
Streams.pipeAll(((PGPLiteralData) message).getInputStream(), actualOutput);
}
message = plainFact.nextObject();
}
actualOutput.close();
byte[] outputBytes = actualOutput.toByteArray();
return outputBytes;
}
public static PGPPrivateKey findPrivateKey(InputStream keyIn, long keyID)
throws IOException, PGPException, NoSuchProviderException {
char[] pass = "".toCharArray();
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyIn),
new JcaKeyFingerprintCalculator());
PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);
if (pgpSecKey == null) {
return null;
}
return pgpSecKey.extractPrivateKey(new JcePBESecretKeyDecryptorBuilder().setProvider("BC").build(pass));
}
public String encrypt(String data, String publicKey) throws Exception {
InputStream dataStream = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));
ByteArrayOutputStream out = encryptAndSign(dataStream, publicKey, privateKeyPath);
return new String(out.toByteArray());
}
public static final ByteArrayOutputStream encryptAndSign(InputStream is, String publicKeyFile, String privateKeyFile)
throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
char[] pass = "".toCharArray();
InputStream encryptKeyInput = new FileInputStream(publicKeyFile);
PGPSecretKey pgpSec = null;
try {
pgpSec = readSecretKey(new FileInputStream(privateKeyFile));
PGPPrivateKey signingKey = pgpSec
.extractPrivateKey(new JcePBESecretKeyDecryptorBuilder().setProvider("BC").build(pass));
String userid = (String) pgpSec.getPublicKey().getUserIDs().next();
BcPGPDataEncryptorBuilder dataEncryptor = new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_256);
dataEncryptor.setSecureRandom(new SecureRandom());
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(dataEncryptor);
PGPPublicKey pgpPublicKey = readPublicKey(encryptKeyInput);
encryptedDataGenerator.addMethod((new BcPublicKeyKeyEncryptionMethodGenerator(pgpPublicKey)));
OutputStream finalOut = new BufferedOutputStream(new ArmoredOutputStream(out), DEFAULT_BUFFER_SIZE);
OutputStream encOut = encryptedDataGenerator.open(finalOut, new byte[1 << 16]);
PGPCompressedDataGenerator compressedDataGenerator = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
OutputStream compressedOut = new BufferedOutputStream(compressedDataGenerator.open(encOut));
PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(
new BcPGPContentSignerBuilder(pgpSec.getPublicKey().getAlgorithm(), HashAlgorithmTags.SHA256));
signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, signingKey);
PGPSignatureSubpacketGenerator subpacketGenerator = new PGPSignatureSubpacketGenerator();
subpacketGenerator.setSignerUserID(false, userid);
signatureGenerator.setHashedSubpackets(subpacketGenerator.generate());
PGPOnePassSignature onePassSignature = signatureGenerator.generateOnePassVersion(false);
onePassSignature.encode(compressedOut);
PGPLiteralDataGenerator literalDataGenerator = new PGPLiteralDataGenerator(true);
OutputStream literalOut = literalDataGenerator.open(compressedOut, PGPLiteralData.BINARY, "", new Date(),
new byte[1 << 16]);
byte[] buffer = new byte[1 << 16];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) {
literalOut.write(buffer, 0, bytesRead);
signatureGenerator.update(buffer, 0, bytesRead);
literalOut.flush();
}
literalOut.close();
literalDataGenerator.close();
signatureGenerator.generate().encode(compressedOut);
compressedOut.close();
compressedDataGenerator.close();
encOut.close();
encryptedDataGenerator.close();
finalOut.close();
is.close();
} catch (Exception e) {
log.error("Encrypting payload error {}", e);
}
return out;
}
public static PGPSecretKey readSecretKey(InputStream input) throws IOException, PGPException {
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(input),
new JcaKeyFingerprintCalculator());
Iterator<?> keyRingIter = pgpSec.getKeyRings();
while (keyRingIter.hasNext()) {
PGPSecretKeyRing keyRing = (PGPSecretKeyRing) keyRingIter.next();
Iterator<?> keyIter = keyRing.getSecretKeys();
while (keyIter.hasNext()) {
PGPSecretKey key = (PGPSecretKey) keyIter.next();
if (key.isSigningKey()) {
return key;
}
}
}
throw new IllegalArgumentException("Can't find signing key in key ring.");
}
private static PGPPublicKey readPublicKey(InputStream input) throws IOException, PGPException {
PGPPublicKeyRingCollection pgpPub = new PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(input),
new JcaKeyFingerprintCalculator());
Iterator<?> keyRingIter = pgpPub.getKeyRings();
while (keyRingIter.hasNext()) {
PGPPublicKeyRing keyRing = (PGPPublicKeyRing) keyRingIter.next();
Iterator<?> keyIter = keyRing.getPublicKeys();
while (keyIter.hasNext()) {
PGPPublicKey key = (PGPPublicKey) keyIter.next();
if (key.isEncryptionKey()) {
return key;
}
}
}
throw new IllegalArgumentException("Can't find encryption key in key ring.");
}
public static void main(String[] args) throws Exception {
PgpEncryptDecrypt pgp = new PgpEncryptDecrypt();
// String enc = pgp.encrypt("{\n"
// + "\"ovdId\": \"XXXXXXXX\",\n"
// + "\"ovdType\": \"PAN\",\n"
// + "\"customerId\": \"999999999\"\n"
// + "}", "/Users/C999999/Desktop/app/online/loan/file/idfc.pgp.key");
//
// System.out.println(enc);
System.out.println(pgp.decryptRequest("-----BEGIN PGP MESSAGE-----\n"
+ "Version: BCPG v1.61\n"
+ "\n"
+ "hQGMA/VxZ/SICerdAQv+MQ27gCauMutFQ6LStJqbanOfisoNqEzIU6mpFWPEwOnK\n"
+ "Yzc6n7yy3NydJBfTVqV5TdVVPY5mlkCx43bMsQXyNuof37ZWzEfJ5ISqktiAWJ1I\n"
+ "igeCh4fW8KYgHB2wiKmeqLVk2hSH3qVK3AQg9oE6V/jCTcF4wyb8aOBRP7CiiHMK\n"
+ "thBGKUe5n5O/WrUS1XA6QXMcO96XKmkV48swew2ksPvCQ4ed1VeLy6ftAXWcfYp2\n"
+ "VKVfnJ6DIq+/qvrn6LdRc7UFBQj9DVPt2iS+IJ43d/bIk7iNIx1eUXZEqV3UMuFW\n"
+ "YeX2a+7TTn5S77BFZOqJoCPRz8Uh82YC6D9mEGd4GgkCR0lHsRS+LfEgc0S+XzB3\n"
+ "pGSHhRVxzJrCY7ymK5MkltYiPvXZ0kPRhRVspAU3YUO88Ruj2RqlC6SMfd2eibIN\n"
+ "soBIQD4MjBAt/kfjExuVZ7o3xiASkQvmcdd+0BDzSmTyOp7m+hvI6HhE8w+3SZaX\n"
+ "tfitGyZ7KFyZI7GKhu3W0sN3AZnUxBPX7O2RNoi2V3cKhTIeEYJfBa1xnAbswvZ/\n"
+ "eoPswGuHyeQcKSFCZVnvZGLG0bRJgw+FoY2rqRRwl+8+H51x+VSBjWo675x3gS/N\n"
+ "n6Sk7LGudd7zPCk8StPdSaBX1A7GXS1MhNSJqNgdFzB3Y01283XvQimiZUzQHB8V\n"
+ "86CN6Gjt0+2eGwga/rMlGdDwsk1J95w6XOL0W5rKr2XmV0hruKZh5aFBWljkffdn\n"
+ "zHy0ZcMsV9JCtKIOCqgrMveuRZm4PvxivFF0lgqaGGb7b4juSw6EyN8A+zXkRRdj\n"
+ "Lh5g7tHWEr9V1krD6XySh4fj0utAWTTWISoU1/c0Zy9KdCQ5DISTzhqMPIarcrQj\n"
+ "8TooYBN9sha3CY6U6Y3wWaucNfGXV79bR04Jq7kLs+jEcnnoYdv/2rj05kjyHzlg\n"
+ "t3jrBBUDq3fbhizuTHSLQZtGM7KNGq2pX76rXAEjHCJ3TRT+jA0S/fdcLZ45kF4q\n"
+ "nQBpvihah/QJtA76R9+D0pOjTtX0Yp2BIcnxVKwiaFdDvBtxZhyTrr0F+1frwMqI\n"
+ "OheoD8rL/34upTj2XFI4i1XjponTydujO8J/WEhEbYuhgjx1M1/tIgMZ3bjjpCR0\n"
+ "OIm3rj1JzD3rLXh45WJklQJxXGLZYBCkvNb9D6g5IFkwlq1IDsaq5maEiHhQommZ\n"
+ "wWGUkv2VwdOZdSbKVGC1EoWe2Q04SzGlXVczM9iYempHrgy01JctkkN2jSrYbc8j\n"
+ "t6XdJ7WF/91/ePxDQ79qZwUXZ/tuho6Oe1LPHnw65clwkDJOfn5RNOPC3g3B2Nj4\n"
+ "0TGnkwNYGkV+3u6G3yI/jImitu5s/0k9Y9mF7zZLZhgHXpHZiYzbirNoz6hY4+CL\n"
+ "P2LJrlEj6bplbFc2anyL1KqmSvQaLd6MOmZLEYv6D80gEhOGAqDkPIL9govpiKRD\n"
+ "+id0oTFVOes7K1wTTNzGcc5qPjc3t10mw8xjfjkXbjY4HVBGDqtWIC1MImhjwBqe\n"
+ "CRXIF3d7NHD3yJjlZqBdgUs0RW3oXEvlGpGhOPF2thBZpZG8o0M24m6xqmvo5fQ2\n"
+ "PY+t6PiZ+PnBKCmZy6/iszzD3XmiKmwIAVVVKwdm4uJ1saAeSTyZDyqgMBZ0ZbjU\n"
+ "jVTOPwRHfXbmljiuSyNpNGKX1V5VoQ1smKU9CQw9Rby8CxBOMiJwIW3RawVWIuWp\n"
+ "8S7jjFW0i68UquJJ7FBXe3MVH7BWHNSWf70OFtgphfDCZ/fNgT9hrGG9q9p2s/c/\n"
+ "90uvGzb6Jvdu4X8swypv0eAQMcrQPj6aaMFBdaOE8Z/2Aq2fm48CpS2hnb7dbrEZ\n"
+ "2yRA8yQsN2JHf772DEhp5K/EKZ1lLyCNEC7NXc75YE72tKKUBxjQsuWmwdUFF2Y1\n"
+ "MIbAmHCMO85qBVEYjfqjsyjgmYAdQjzz2glgXwvVwAT4KPq7Co7+msU=\n"
+ "=IDVG\n"
+ "-----END PGP MESSAGE-----\n"
+ "", "publickeypath"));
}
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Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world's number one server programming language with a 12 million developer community, 5 million students studying worldwide and it's #1 choice for the cloud development.
short x = 999; // -32768 to 32767
int x = 99999; // -2147483648 to 2147483647
long x = 99999999999L; // -9223372036854775808 to 9223372036854775807
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char x = 'A';
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When ever you want to perform a set of operations based on a condition If-Else is used.
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Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.
switch(<conditional-expression>) {
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case value2:
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For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.
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Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
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Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.
class keyword is required to create a class.
class Mobile {
public: // access specifier which specifies that accessibility of class members
string name; // string variable (attribute)
int price; // int variable (attribute)
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public class Greeting {
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public static void main(String[] args) {
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Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:
This framework also defines map interfaces and several classes in addition to Collections.
| Collection | Description |
|---|---|
| Set | Set is a collection of elements which can not contain duplicate values. Set is implemented in HashSets, LinkedHashSets, TreeSet etc |
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| Queue | FIFO approach, while instantiating Queue interface you can either choose LinkedList or PriorityQueue. |
| Deque | Deque(Double Ended Queue) is used to add or remove elements from both the ends of the Queue(both head and tail) |
| Map | Map contains key-values pairs which don't have any duplicates. Map is implemented in HashMap, TreeMap etc. |