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Merge pull request #2 from TpmKranz/feature-pgpencryption
Add PGP encryption abilities
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92 changes: 92 additions & 0 deletions
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app/src/main/java/org/tpmkranz/smsforward/PGPPubkeyEncryptionUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package org.tpmkranz.smsforward; | ||
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| import android.util.Log; | ||
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| import org.spongycastle.bcpg.ArmoredOutputStream; | ||
| import org.spongycastle.openpgp.PGPCompressedData; | ||
| import org.spongycastle.openpgp.PGPCompressedDataGenerator; | ||
| import org.spongycastle.openpgp.PGPEncryptedData; | ||
| import org.spongycastle.openpgp.PGPEncryptedDataGenerator; | ||
| import org.spongycastle.openpgp.PGPException; | ||
| import org.spongycastle.openpgp.PGPLiteralData; | ||
| import org.spongycastle.openpgp.PGPLiteralDataGenerator; | ||
| import org.spongycastle.openpgp.PGPPublicKey; | ||
| import org.spongycastle.openpgp.PGPPublicKeyRing; | ||
| import org.spongycastle.openpgp.PGPUtil; | ||
| import org.spongycastle.openpgp.jcajce.JcaPGPPublicKeyRingCollection; | ||
| import org.spongycastle.openpgp.operator.bc.BcPGPDataEncryptorBuilder; | ||
| import org.spongycastle.openpgp.operator.bc.BcPublicKeyKeyEncryptionMethodGenerator; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import java.nio.charset.Charset; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.security.SecureRandom; | ||
| import java.util.Date; | ||
| import java.util.Iterator; | ||
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| /** | ||
| * Created by tpm on 11/20/15. | ||
| */ | ||
| public class PGPPubkeyEncryptionUtil { | ||
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| protected static String LOGCATTAG = "PGPPubkeyEncryptionUtil"; | ||
| private PGPPublicKey publicKey = null; | ||
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| public PGPPubkeyEncryptionUtil(String pubkeyBlock){ | ||
| InputStream in = new ByteArrayInputStream(pubkeyBlock.getBytes()); | ||
| publicKey = null; | ||
| try { | ||
| in = PGPUtil.getDecoderStream(in); | ||
| JcaPGPPublicKeyRingCollection pgpPub = new JcaPGPPublicKeyRingCollection(in); | ||
| in.close(); | ||
| Iterator<PGPPublicKeyRing> rIt = pgpPub.getKeyRings(); | ||
| while (publicKey == null && rIt.hasNext()) { | ||
| PGPPublicKeyRing keyRing = rIt.next(); | ||
| Iterator<PGPPublicKey> kIt = keyRing.getPublicKeys(); | ||
| while (publicKey == null && kIt.hasNext()) { | ||
| PGPPublicKey k = kIt.next(); | ||
| if (k.isEncryptionKey()) { | ||
| publicKey = k; | ||
| } | ||
| } | ||
| } | ||
| } catch (Exception e){ | ||
| Log.e(LOGCATTAG, e.toString()); | ||
| } | ||
| } | ||
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| public boolean hasKey(){ | ||
| return publicKey != null; | ||
| } | ||
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| public String encrypt(String plainText) throws NoSuchAlgorithmException, IOException, PGPException { | ||
| byte[] rawText = plainText.getBytes(); | ||
| //This needs, like, three metric fucktons of explanation and/or cleaning up | ||
| ByteArrayOutputStream encOut = new ByteArrayOutputStream(); | ||
| OutputStream out = new ArmoredOutputStream(encOut); | ||
| ByteArrayOutputStream bOut = new ByteArrayOutputStream(); | ||
| PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(PGPCompressedData.ZIP); | ||
| OutputStream cos = comData.open(bOut); | ||
| PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator(); | ||
| OutputStream pOut = lData.open(cos, PGPLiteralData.BINARY, PGPLiteralData.CONSOLE, rawText.length, new Date()); | ||
| pOut.write(rawText); | ||
| lData.close(); | ||
| comData.close(); | ||
| BcPGPDataEncryptorBuilder builder = new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_256); | ||
| builder.setWithIntegrityPacket(true); | ||
| builder.setSecureRandom(new SecureRandom()); | ||
| PGPEncryptedDataGenerator cpk = new PGPEncryptedDataGenerator(builder); | ||
| cpk.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(publicKey)); | ||
| byte[] bytes = bOut.toByteArray(); | ||
| OutputStream cOut = cpk.open(out, bytes.length); | ||
| cOut.write(bytes); | ||
| cOut.close(); | ||
| out.close(); | ||
| return new String(encOut.toByteArray(), Charset.forName("UTF-8")); | ||
| } | ||
| } |
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