問題
Bouncy Castle Java を使用して、PGP を使用してファイルを暗号化しています。このプログラムは、SAP PI 7.0 で実行することを目的としています。復号化プログラムに対して PI の出力 (暗号化されたファイル) を実行すると、エラーのない空の復号化ファイルが得られます。
そこで、同じパラメーターを使用して、Eclipse で同じソース ファイルを暗号化しようとしました。今回は、出力を正しく復号化し、元のファイルを取得することができました。同じコード、同じ入力。
ある時点で、PI 出力がEclipse の出力よりも数バイト(通常は 32 バイト)短いことに気付きました。それが、復号化出力がエラーなしで空である理由だと思います。両方の PGP メッセージの形状が同じであるため、暗号化されたファイルに何が欠けているのかわかりません。
どうすれば修正できるかについて何か提案はありますか？欠落している PGP メッセージの一部はありますか? PI 環境でライブラリや構成ポイントを見逃していませんか?
技術的な詳細
弾む城
- バージョン 1.47
- JDK: 1.3
- http://polydistortion.net/bc/download/でダウンロード可能な Jar : jce-jdk13-147.jar、bcpg-jdk13-147.jar
ローカル環境
- Java: 1.6.0_45
- オペレーティング システム: Windows 7 SP1
- JDK バージョン: 1.3
SAP PI 環境
- PI バージョン: 7.0
- Java ランタイム: Java(TM) 2 ランタイム環境、標準版 (バージョン=1.4.2_14-b05)
- Java 仮想マシン : Java HotSpot(TM) 64 ビット サーバー VM (バージョン=1.4.2_14-b05)
- オペレーティング システム: Windows 2003 (バージョン = 5.2、アーチ = amd64)
- JDK バージョン: 1.3
DSA キー ペア
公開鍵
-----PGP 公開鍵ブロックの開始-----
バージョン: BCPG v1.47
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=CPWK
-----PGP 公開鍵ブロックの終了-----
秘密鍵（パスワード：「TestPass12345!」）
-----PGP プライベート キー ブロックの開始-----
バージョン: BCPG v1.47
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=クアック
-----PGP プライベート キー ブロックの終了-----
暗号化された出力
エクリプス
-----PGP メッセージの開始-----
バージョン: BCPG v1.47
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=/OMU
-----PGP メッセージの終了-----
SAP PI
-----PGP メッセージの開始-----
バージョン: BCPG v1.47
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=OL09
-----PGP メッセージの終了-----
Java コード
BcPGP.java
public class BcPGP {
private static final int BUFFER_SIZE = 1 << 16; // should always be power of
// 2
private static final int KEY_FLAGS = 27;
private static final int[] MASTER_KEY_CERTIFICATION_TYPES = new int[] { PGPSignature.POSITIVE_CERTIFICATION,
PGPSignature.CASUAL_CERTIFICATION, PGPSignature.NO_CERTIFICATION, PGPSignature.DEFAULT_CERTIFICATION };
public static PGPPublicKey readPublicKey(InputStream in) throws IOException, PGPException {
PGPPublicKeyRingCollection keyRingCollection = new PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(in));
//
// we just loop through the collection till we find a key suitable for
// encryption, in the real
// world you would probably want to be a bit smarter about this.
//
PGPPublicKey publicKey = null;
//
// iterate through the key rings.
//
Iterator rIt = keyRingCollection.getKeyRings();
while (publicKey == null && rIt.hasNext()) {
PGPPublicKeyRing kRing = (PGPPublicKeyRing) rIt.next();
Iterator kIt = kRing.getPublicKeys();
while (publicKey == null && kIt.hasNext()) {
PGPPublicKey key = (PGPPublicKey) kIt.next();
if (key.isEncryptionKey()) {
publicKey = key;
}
}
}
if (publicKey == null) {
throw new IllegalArgumentException("Can't find public key in the key ring.");
}
if (!isForEncryption(publicKey)) {
throw new IllegalArgumentException("KeyID " + publicKey.getKeyID() + " not flagged for encryption.");
}
return publicKey;
}
public static PGPSecretKey readSecretKey(InputStream in) throws IOException, PGPException {
PGPSecretKeyRingCollection keyRingCollection = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(in));
//
// We just loop through the collection till we find a key suitable for
// signing.
// In the real world you would probably want to be a bit smarter about
// this.
//
PGPSecretKey secretKey = null;
Iterator rIt = keyRingCollection.getKeyRings();
while (secretKey == null && rIt.hasNext()) {
PGPSecretKeyRing keyRing = (PGPSecretKeyRing) rIt.next();
Iterator kIt = keyRing.getSecretKeys();
while (secretKey == null && kIt.hasNext()) {
PGPSecretKey key = (PGPSecretKey) kIt.next();
if (key.isSigningKey()) {
secretKey = key;
}
}
}
// Validate secret key
if (secretKey == null) {
throw new IllegalArgumentException("Can't find private key in the key ring.");
}
if (!secretKey.isSigningKey()) {
throw new IllegalArgumentException("Private key does not allow signing.");
}
if (secretKey.getPublicKey().isRevoked()) {
throw new IllegalArgumentException("Private key has been revoked.");
}
if (!hasKeyFlags(secretKey.getPublicKey(), KeyFlags.SIGN_DATA)) {
throw new IllegalArgumentException("Key cannot be used for signing.");
}
return secretKey;
}
/**
* Load a secret key ring collection from keyIn and find the private key
* corresponding to keyID if it exists.
*
* @param keyIn
* input stream representing a key ring collection.
* @param keyID
* keyID we want.
* @param pass
* passphrase to decrypt secret key with.
* @return
* @throws IOException
* @throws PGPException
* @throws NoSuchProviderException
*/
public static PGPPrivateKey findPrivateKey(InputStream keyIn, long keyID, char[] pass) throws IOException, PGPException,
NoSuchProviderException {
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyIn));
return findPrivateKey(pgpSec.getSecretKey(keyID), pass);
}
/**
* Load a secret key and find the private key in it
*
* @param pgpSecKey
* The secret key
* @param pass
* passphrase to decrypt secret key with
* @return
* @throws PGPException
*/
public static PGPPrivateKey findPrivateKey(PGPSecretKey pgpSecKey, char[] pass) throws PGPException {
if (pgpSecKey == null)
return null;
PBESecretKeyDecryptor decryptor = new BcPBESecretKeyDecryptorBuilder(new BcPGPDigestCalculatorProvider()).build(pass);
return pgpSecKey.extractPrivateKey(decryptor);
}
/**
* decrypt the passed in message stream
*/
public static void decryptFile(InputStream in, OutputStream out, InputStream keyIn, char[] passwd) throws Exception {
Security.addProvider(new BouncyCastleProvider());
in = org.bouncycastle.openpgp.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 it = enc.getEncryptedDataObjects();
PGPPrivateKey sKey = null;
PGPPublicKeyEncryptedData pbe = null;
while (sKey == null && it.hasNext()) {
pbe = (PGPPublicKeyEncryptedData) it.next();
sKey = findPrivateKey(keyIn, pbe.getKeyID(), passwd);
}
if (sKey == null) {
throw new IllegalArgumentException("Secret key for message not found.");
}
InputStream clear = pbe.getDataStream(new BcPublicKeyDataDecryptorFactory(sKey));
PGPObjectFactory plainFact = new PGPObjectFactory(clear);
Object message = plainFact.nextObject();
if (message instanceof PGPCompressedData) {
PGPCompressedData cData = (PGPCompressedData) message;
PGPObjectFactory pgpFact = new PGPObjectFactory(cData.getDataStream());
message = pgpFact.nextObject();
}
if (message instanceof PGPLiteralData) {
PGPLiteralData ld = (PGPLiteralData) message;
InputStream unc = ld.getInputStream();
int ch;
while ((ch = unc.read()) >= 0) {
out.write(ch);
}
} else if (message instanceof PGPOnePassSignatureList) {
throw new PGPException("Encrypted message contains a signed message - not literal data.");
} else {
throw new PGPException("Message is not a simple encrypted file - type unknown.");
}
if (pbe.isIntegrityProtected()) {
if (!pbe.verify()) {
throw new PGPException("Message failed integrity check");
}
}
}
public static void encryptFile(OutputStream out, InputStream is, PGPPublicKey encKey, boolean armor,
boolean withIntegrityCheck, int compressType, int encryptType) throws IOException, NoSuchProviderException,
PGPException {
System.out.println("Add BouncyCastleProvider");
Security.addProvider(new BouncyCastleProvider());
if (armor) {
out = new ArmoredOutputStream(out);
}
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(compressType);
// setup temp file to hold source data - this is necessary when using
// PGPUtil.writeFileToLiteralData which uses a file
System.out.println("Creating a temp file...");
File tempfile = File.createTempFile("pgp", null);
FileOutputStream fos = new FileOutputStream(tempfile);
int read = 0;
byte[] inBytes = new byte[1024];
while ((read = is.read(inBytes)) != -1) {
fos.write(inBytes, 0, read);
}
fos.flush();
fos.close();
System.out.println("Temp file created at ");
System.out.println(tempfile.getAbsolutePath());
PGPUtil.writeFileToLiteralData(comData.open(bOut), PGPLiteralData.BINARY, new File(tempfile.getAbsolutePath()));
comData.close();
BcPGPDataEncryptorBuilder dataEncryptor = new BcPGPDataEncryptorBuilder(encryptType);
dataEncryptor.setWithIntegrityPacket(withIntegrityCheck);
dataEncryptor.setSecureRandom(new SecureRandom());
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(dataEncryptor);
encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(encKey));
byte[] outBytes = bOut.toByteArray();
OutputStream cOut = encryptedDataGenerator.open(out, outBytes.length);
cOut.write(outBytes);
cOut.close();
out.close();
System.out.println("data encrypted");
}
public static void signEncryptFile(OutputStream out, String fileName, PGPPublicKey publicKey, PGPSecretKey secretKey,
String password, boolean armor, boolean withIntegrityCheck) throws Exception {
// Initialize Bouncy Castle security provider
Provider provider = new BouncyCastleProvider();
Security.addProvider(provider);
if (armor) {
out = new ArmoredOutputStream(out);
}
BcPGPDataEncryptorBuilder dataEncryptor = new BcPGPDataEncryptorBuilder(SymmetricKeyAlgorithmTags.TRIPLE_DES);
dataEncryptor.setWithIntegrityPacket(withIntegrityCheck);
dataEncryptor.setSecureRandom(new SecureRandom());
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(dataEncryptor);
encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(publicKey));
OutputStream encryptedOut = encryptedDataGenerator.open(out, new byte[BcPGP.BUFFER_SIZE]);
// Initialize compressed data generator
PGPCompressedDataGenerator compressedDataGenerator = new PGPCompressedDataGenerator(CompressionAlgorithmTags.ZIP);
OutputStream compressedOut = compressedDataGenerator.open(encryptedOut, new byte[BcPGP.BUFFER_SIZE]);
// Initialize signature generator
PGPPrivateKey privateKey = findPrivateKey(secretKey, password.toCharArray());
PGPContentSignerBuilder signerBuilder = new BcPGPContentSignerBuilder(secretKey.getPublicKey().getAlgorithm(),
HashAlgorithmTags.SHA1);
PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(signerBuilder);
signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, privateKey);
boolean firstTime = true;
Iterator it = secretKey.getPublicKey().getUserIDs();
while (it.hasNext() && firstTime) {
PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
spGen.setSignerUserID(false, (String) it.next());
signatureGenerator.setHashedSubpackets(spGen.generate());
// Exit the loop after the first iteration
firstTime = false;
}
signatureGenerator.generateOnePassVersion(false).encode(compressedOut);
// Initialize literal data generator
PGPLiteralDataGenerator literalDataGenerator = new PGPLiteralDataGenerator();
OutputStream literalOut = literalDataGenerator.open(compressedOut, PGPLiteralData.BINARY, fileName, new Date(),
new byte[BcPGP.BUFFER_SIZE]);
// Main loop - read the "in" stream, compress, encrypt and write to the
// "out" stream
FileInputStream in = new FileInputStream(fileName);
byte[] buf = new byte[BcPGP.BUFFER_SIZE];
int len;
while ((len = in.read(buf)) > 0) {
literalOut.write(buf, 0, len);
signatureGenerator.update(buf, 0, len);
}
in.close();
literalDataGenerator.close();
// Generate the signature, compress, encrypt and write to the "out"
// stream
signatureGenerator.generate().encode(compressedOut);
compressedDataGenerator.close();
encryptedDataGenerator.close();
if (armor) {
out.close();
}
}
// public static boolean verifyFile(InputStream in, InputStream keyIn,
// String extractContentFile) throws Exception {
// in = PGPUtil.getDecoderStream(in);
//
// PGPObjectFactory pgpFact = new PGPObjectFactory(in);
// PGPCompressedData c1 = (PGPCompressedData) pgpFact.nextObject();
//
// pgpFact = new PGPObjectFactory(c1.getDataStream());
//
// PGPOnePassSignatureList p1 = (PGPOnePassSignatureList)
// pgpFact.nextObject();
//
// PGPOnePassSignature ops = p1.get(0);
//
// PGPLiteralData p2 = (PGPLiteralData) pgpFact.nextObject();
//
// InputStream dIn = p2.getInputStream();
//
// IOUtils.copy(dIn, new FileOutputStream(extractContentFile));
//
// int ch;
// PGPPublicKeyRingCollection pgpRing = new
// PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(keyIn));
//
// PGPPublicKey key = pgpRing.getPublicKey(ops.getKeyID());
//
// FileOutputStream out = new FileOutputStream(p2.getFileName());
//
// ops.init(new BcPGPContentVerifierBuilderProvider(), key);
//
// while ((ch = dIn.read()) >= 0) {
// ops.update((byte) ch);
// out.write(ch);
// }
//
// out.close();
//
// PGPSignatureList p3 = (PGPSignatureList) pgpFact.nextObject();
// return ops.verify(p3.get(0));
// }
/**
* From LockBox Lobs PGP Encryption tools.
* http://www.lockboxlabs.org/content/downloads
*
* I didn't think it was worth having to import a 4meg lib for three methods
*
* @param key
* @return
*/
public static boolean isForEncryption(PGPPublicKey key) {
if (key.getAlgorithm() == PublicKeyAlgorithmTags.RSA_SIGN || key.getAlgorithm() == PublicKeyAlgorithmTags.DSA
|| key.getAlgorithm() == PublicKeyAlgorithmTags.EC || key.getAlgorithm() == PublicKeyAlgorithmTags.ECDSA) {
return false;
}
return hasKeyFlags(key, KeyFlags.ENCRYPT_COMMS | KeyFlags.ENCRYPT_STORAGE);
}
/**
* From LockBox Lobs PGP Encryption tools.
* http://www.lockboxlabs.org/content/downloads
*
* I didn't think it was worth having to import a 4meg lib for three methods
*
* @param key
* @return
*/
private static boolean hasKeyFlags(PGPPublicKey encKey, int keyUsage) {
if (encKey.isMasterKey()) {
for (int i = 0; i != BcPGP.MASTER_KEY_CERTIFICATION_TYPES.length; i++) {
for (Iterator eIt = encKey.getSignaturesOfType(BcPGP.MASTER_KEY_CERTIFICATION_TYPES[i]); eIt.hasNext();) {
PGPSignature sig = (PGPSignature) eIt.next();
if (!isMatchingUsage(sig, keyUsage)) {
return false;
}
}
}
} else {
for (Iterator eIt = encKey.getSignaturesOfType(PGPSignature.SUBKEY_BINDING); eIt.hasNext();) {
PGPSignature sig = (PGPSignature) eIt.next();
if (!isMatchingUsage(sig, keyUsage)) {
return false;
}
}
}
return true;
}
/**
* From LockBox Lobs PGP Encryption tools.
* http://www.lockboxlabs.org/content/downloads
*
* I didn't think it was worth having to import a 4meg lib for three methods
*
* @param key
* @return
*/
private static boolean isMatchingUsage(PGPSignature sig, int keyUsage) {
if (sig.hasSubpackets()) {
PGPSignatureSubpacketVector sv = sig.getHashedSubPackets();
if (sv.hasSubpacket(BcPGP.KEY_FLAGS)) {
if ((sv.getKeyFlags() & keyUsage) == 0) {
return false;
}
}
}
return true;
}
}
ファイルコピーPGP
public class FileCopyPGP {
static final String PUBLIC_KEY_PATH = "D:\\PGP\\public.asc";
static final String PRIVATE_KEY_PATH = "D:\\PGP\\secret.asc";
static final String PASSWORD = "TestPass12345!";
static final String SOURCE_PATH = "D:\\PGP\\run\\Source.txt";
static final String ENCRYPTED_PATH = "D:\\PGP\\run\\Encrypted.txt";
static final String DECRYPTED_PATH = "D:\\PGP\\run\\Decrypted.txt";
public static void encrypt(InputStream is, OutputStream os) {
try {
PGPPublicKey encKey = BcPGP.readPublicKey(new FileInputStream(new File(PUBLIC_KEY_PATH)));
long start = System.currentTimeMillis();
System.out.println("Encryption started");
BcPGP.encryptFile(os, is, encKey, true, true, CompressionAlgorithmTags.UNCOMPRESSED,
SymmetricKeyAlgorithmTags.AES_256);
System.out.println("Encryption ended successfully in " + (System.currentTimeMillis() - start) + "ms");
} catch (IOException e) {
System.out.println(e.getMessage());
} catch (PGPException e) {
System.out.println(e.getMessage());
} catch (NoSuchProviderException e) {
System.out.println(e.getMessage());
}
}
public static void decrypt(InputStream is, OutputStream os) {
try {
long start = System.currentTimeMillis();
System.out.println("Decryption started");
BcPGP.decryptFile(is, os, new FileInputStream(new File(PRIVATE_KEY_PATH)), PASSWORD.toCharArray());
System.out.println("Decryption ended successfully in " + (System.currentTimeMillis() - start) + "ms");
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
public static void main(String[] args) throws FileNotFoundException {
encrypt(new FileInputStream(new File(SOURCE_PATH)), new FileOutputStream(new File(ENCRYPTED_PATH)));
decrypt(new FileInputStream(new File(ENCRYPTED_PATH)), new FileOutputStream(new File(DECRYPTED_PATH)));
}
}