我正在尝试使用 java BouncyCaSTLe 库解密和验证 PGP 消息,但遇到了问题,提示 PartialInputStream 过早结束。
我知道加密工作正常,因为我可以在命令行上使用 gpg 解密和验证使用加密功能创建的消息。
代码如下:
public static void signEncryptMessage(InputStream in, OutputStream out, PGPPublicKey publicKey, PGPPrivateKey secretKey, SecureRandom rand) throws Exception {
out = new ArmoredOutputStream(out);
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_256).setWithIntegrityPacket(true).setSecureRandom(rand));
encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(publicKey));
OutputStream compressedOut = new PGPCompressedDataGenerator(PGPCompressedData.ZIP).open(encryptedDataGenerator.open(out, 4096), new byte[4096]);
PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(new BcPGPContentSignerBuilder(publicKey.getAlgorithm(), HashAlgorithmTags.SHA512));
signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, secretKey);
signatureGenerator.generateOnePassVersion(true).encode(compressedOut);
OutputStream finalOut = new PGPLiteralDataGenerator().open(compressedOut, PGPLiteralData.BINARY, "", new Date(), new byte[4096]);
byte[] buf = new byte[4096];
int len;
while ((len = in.read(buf)) > 0) {
finalOut.write(buf, 0, len);
signatureGenerator.update(buf, 0, len);
}
finalOut.close();
in.close();
signatureGenerator.generate().encode(compressedOut);
compressedOut.close();
encryptedDataGenerator.close();
out.close();
}
public static void decryptVerifyMessage(InputStream in, OutputStream out, PGPPrivateKey secretKey, PGPPublicKey publicKey) throws Exception {
in = new ArmoredInputStream(in);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
PGPEncryptedDataList enc = (PGPEncryptedDataList) pgpF.nextObject();
PGPObjectFactory plainFact = new PGPObjectFactory(((PGPPublicKeyEncryptedData) enc.getEncryptedDataObjects().next()).getDataStream(new JcePublicKeyDataDecryptorFactoryBuilder().setProvider("BC").build(secretKey)));
Object message = null;
PGPOnePassSignatureList onePassSignatureList = null;
PGPSignatureList signatureList = null;
PGPCompressedData compressedData = null;
message = plainFact.nextObject();
ByteArrayOutputStream actualOutput = new ByteArrayOutputStream();
while (message != null) {
System.out.println(message.toString());
if (message instanceof PGPCompressedData) {
compressedData = (PGPCompressedData) message;
plainFact = new PGPObjectFactory(compressedData.getDataStream());
message = plainFact.nextObject();
System.out.println(message.toString());
}
if (message instanceof PGPLiteralData) {
Streams.pipeAll(((PGPLiteralData) message).getInputStream(), actualOutput);
} else if (message instanceof PGPOnePassSignatureList) {
onePassSignatureList = (PGPOnePassSignatureList) message;
} else if (message instanceof PGPSignatureList) {
signatureList = (PGPSignatureList) message;
} else {
throw new PGPException("message unknown message type.");
}
message = plainFact.nextObject();
}
actualOutput.close();
byte[] output = actualOutput.toByteArray();
if (onePassSignatureList == null || signatureList == null) {
throw new PGPException("Poor PGP. Signatures not found.");
} else {
for (int i = 0; i < onePassSignatureList.size(); i++) {
PGPOnePassSignature ops = onePassSignatureList.get(0);
System.out.println("verifier : " + ops.getKeyID());
if (publicKey != null) {
ops.init(new JcaPGPContentVerifierBuilderProvider().setProvider("BC"), publicKey);
ops.update(output);
PGPSignature signature = signatureList.get(i);
if (ops.verify(signature)) {
Iterator<?> userIds = publicKey.getUserIDs();
while (userIds.hasNext()) {
String userId = (String) userIds.next();
System.out.println("Signed by " + userId);
}
System.out.println("Signature verified");
} else {
throw new SignatureException("Signature verification failed");
}
}
}
}
out.write(output);
out.flush();
out.close();
}
public static void main(String args[]) {
Security.insertProviderAt(new BouncyCastleProvider(), 0);
byte inBytes[] = "The quick brown fox jumps over the lazy dog.".getBytes();
try {
SecureRandom rand = new SecureRandom();
RSAKeyPairGenerator kpg = new RSAKeyPairGenerator();
kpg.init(new RSAKeyGenerationParameters(BigInteger.valueOf(0x10001), rand, 1024, 90));
BcPGPKeyPair sender = new BcPGPKeyPair(PGPPublicKey.RSA_GENERAL, kpg.generateKeyPair(), new Date());
BcPGPKeyPair recip = new BcPGPKeyPair(PGPPublicKey.RSA_GENERAL, kpg.generateKeyPair(), new Date());
ByteArrayOutputStream sendMessage = new ByteArrayOutputStream();
ByteArrayOutputStream recvMessage = new ByteArrayOutputStream();
signEncryptMessage(new ByteArrayInputStream(inBytes), sendMessage, recip.getPublicKey(), sender.getPrivateKey(), rand);
System.out.println(sendMessage.toString());
decryptVerifyMessage(new ByteArrayInputStream(sendMessage.toByteArray()), recvMessage, recip.getPrivateKey(), sender.getPublicKey());
System.out.println(recvMessage.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
运行几次 message = plainFact.nextObject();
后抛出异常:
-----BEGIN PGP MESSAGE-----
Version: BCPG v1.49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=ApMf
-----END PGP MESSAGE-----
org.bouncycastle.openpgp.PGPCompressedData@cd36a6d
org.bouncycastle.openpgp.PGPOnePassSignatureList@7e224235
org.bouncycastle.openpgp.PGPLiteralData@7b28e644
java.io.EOFException: premature end of stream in PartialInputStream
at org.bouncycastle.bcpg.BCPGInputStream$PartialInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at java.io.InputStream.read(InputStream.java:101)
at javax.crypto.CipherInputStream.getMoreData(CipherInputStream.java:103)
at javax.crypto.CipherInputStream.read(CipherInputStream.java:177)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at org.bouncycastle.openpgp.PGPEncryptedData$TruncatedStream.read(Unknown Source)
at java.io.InputStream.read(InputStream.java:170)
at org.bouncycastle.util.io.TeeInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream$PartialInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at org.bouncycastle.openpgp.PGPCompressedData$1.fill(Unknown Source)
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:158)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream$PartialInputStream.read(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.read(Unknown Source)
at org.bouncycastle.util.io.Streams.readFully(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.readFully(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.readFully(Unknown Source)
at org.bouncycastle.bcpg.MPInteger.<init>(Unknown Source)
at org.bouncycastle.bcpg.SignaturePacket.<init>(Unknown Source)
at org.bouncycastle.bcpg.BCPGInputStream.readPacket(Unknown Source)
at org.bouncycastle.openpgp.PGPSignature.<init>(Unknown Source)
at org.bouncycastle.openpgp.PGPObjectFactory.nextObject(Unknown Source)
at main.decryptVerifyMessage(main.java:113)
at main.main(main.java:167)
有什么想法吗?
旁注,此解密代码来自How to decrypt a signed pgp encrypted file? , 稍微修改以适应:消息将仅来自该加密方法,并直接处理 key 而不是 key 流。
干杯
拉莫
最佳答案
我最近尝试做同样的事情,并根据我在 BouncycaSTLe 示例中找到的代码和我在网络上找到的教程将此方法放在一起。出于我的目的,我的代码有一个具有公钥/私钥对的单例加密对象。在示例代码中,您可以替换
INSTANCE._secretKeyRingCollection.getSecretKey(pbe.getKeyID());
用你的秘钥。我已经使用一个长期存在的过程测试了此方法,该过程执行了数十次加密和签名/解密和验证操作,但没有出现您所看到的异常。
public static void decryptAndVerify(InputStream in, OutputStream fOut, InputStream publicKeyIn) throws IOException, SignatureException, PGPException {
in = PGPUtil.getDecoderStream(in);
PGPObjectFactory pgpF = new PGPObjectFactory(in);
PGPEncryptedDataList enc;
Object o = pgpF.nextObject();
//
// the first object might be a PGP marker packet.
//
if (o instanceof PGPEncryptedDataList) {
enc = (PGPEncryptedDataList) o;
} else {
enc = (PGPEncryptedDataList) pgpF.nextObject();
}
//
// find the secret key
//
Iterator<PGPPublicKeyEncryptedData> it = enc.getEncryptedDataObjects();
PGPPrivateKey sKey = null;
PGPPublicKeyEncryptedData pbe = null;
while (sKey == null && it.hasNext()) {
pbe = it.next();
PBESecretKeyDecryptor decryptor = new BcPBESecretKeyDecryptorBuilder(new BcPGPDigestCalculatorProvider()).build(INSTANCE._secretKeyPass.toCharArray());
PGPSecretKey psKey = INSTANCE._secretKeyRingCollection.getSecretKey(pbe.getKeyID());
if (psKey != null) {
sKey = psKey.extractPrivateKey(decryptor);
}
}
if (sKey == null) {
throw new IllegalArgumentException("Unable to find secret key to decrypt the message");
}
InputStream clear = pbe.getDataStream(new BcPublicKeyDataDecryptorFactory(sKey));
PGPObjectFactory plainFact = new PGPObjectFactory(clear);
Object message;
PGPOnePassSignatureList onePassSignatureList = null;
PGPSignatureList signatureList = null;
PGPCompressedData compressedData;
message = plainFact.nextObject();
ByteArrayOutputStream actualOutput = new ByteArrayOutputStream();
while (message != null) {
__l.trace(message.toString());
if (message instanceof PGPCompressedData) {
compressedData = (PGPCompressedData) message;
plainFact = new PGPObjectFactory(compressedData.getDataStream());
message = plainFact.nextObject();
}
if (message instanceof PGPLiteralData) {
// have to read it and keep it somewhere.
Streams.pipeAll(((PGPLiteralData) message).getInputStream(), actualOutput);
} else if (message instanceof PGPOnePassSignatureList) {
onePassSignatureList = (PGPOnePassSignatureList) message;
} else if (message instanceof PGPSignatureList) {
signatureList = (PGPSignatureList) message;
} else {
throw new PGPException("message unknown message type.");
}
message = plainFact.nextObject();
}
actualOutput.close();
PGPPublicKey publicKey = null;
byte[] output = actualOutput.toByteArray();
if (onePassSignatureList == null || signatureList == null) {
throw new PGPException("Poor PGP. Signatures not found.");
} else {
for (int i = 0; i < onePassSignatureList.size(); i++) {
PGPOnePassSignature ops = onePassSignatureList.get(0);
__l.trace("verifier : " + ops.getKeyID());
PGPPublicKeyRingCollection pgpRing = new PGPPublicKeyRingCollection(
PGPUtil.getDecoderStream(publicKeyIn));
publicKey = pgpRing.getPublicKey(ops.getKeyID());
if (publicKey != null) {
ops.init(new JcaPGPContentVerifierBuilderProvider().setProvider("BC"), publicKey);
ops.update(output);
PGPSignature signature = signatureList.get(i);
if (ops.verify(signature)) {
Iterator<?> userIds = publicKey.getUserIDs();
while (userIds.hasNext()) {
String userId = (String) userIds.next();
__l.trace(String.format("Signed by {%s}", userId));
}
__l.trace("Signature verified");
} else {
throw new SignatureException("Signature verification failed");
}
}
}
}
if (pbe.isIntegrityProtected() && !pbe.verify()) {
throw new PGPException("Data is integrity protected but integrity is lost.");
} else if (publicKey == null) {
throw new SignatureException("Signature not found");
} else {
fOut.write(output);
fOut.flush();
fOut.close();
}
}
关于java - BouncycaSTLe PGP解密验证,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19173181/