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116 lines
4.7 KiB
Markdown
116 lines
4.7 KiB
Markdown
# PGPainless - Use OpenPGP Painlessly!
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PGPainless aims to make using OpenPGP in Java projects as simple as possible.
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It does so by introducing an intuitive Builder structure, which allows easy
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setup of encryption / decrytion operations, as well as straight forward key generation.
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PGPainless is based around the Bouncycastle java library and can be used on Android down to API level 9.
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### NOTE: PGPainless is in a *very* early state of development and should under no circumstances be used for serious production usage yet.
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## How to use PGPainless
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The entry point to the API is the `PGPainless` class. Here you can find methods for a quick start :)
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### Generate Keys
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The first thing you probably want to do is generate you some nice tasty Key Pairs. The most straight forward way to do so is by calling
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```
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PGPSecretKeyRing keyRing = PGPainless.generateKeyRing()
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.simpleRsaKeyRing("Juliet <juliet@montague.lit>", RsaLength._4096);
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```
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but feel free to explore the API further. PGPainless allows you to create Key Pairs consisting of a master key plus several sub keys, even with different algorithms at the same time!
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Take for example a look at this delicious key:
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```
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PGPSecretKeyRing keyRing = PGPainless.generateKeyRing()
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.withSubKey(
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KeySpec.getBuilder(ECDSA.fromCurve(EllipticCurve._P256))
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.withKeyFlags(KeyFlag.SIGN_DATA)
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.withDetailedConfiguration()
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.withDefaultSymmetricAlgorithms()
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.withDefaultHashAlgorithms()
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.withPreferredCompressionAlgorithms(CompressionAlgorithm.ZLIB)
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.withFeature(Feature.MODIFICATION_DETECTION)
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.done())
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.withSubKey(
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KeySpec.getBuilder(ECDH.fromCurve(EllipticCurve._P256))
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.withKeyFlags(KeyFlag.ENCRYPT_COMMS, KeyFlag.ENCRYPT_STORAGE)
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.withDefaultAlgorithms())
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.withMasterKey(
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KeySpec.getBuilder(RSA_GENERAL.withLength(RsaLength._8192))
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.withKeyFlags(KeyFlag.SIGN_DATA, KeyFlag.CERTIFY_OTHER)
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.withDefaultAlgorithms())
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.withPrimaryUserId("Juliet <juliet@montague.lit>")
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.withPassphrase("romeo_oh_Romeo<3")
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.build();
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```
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### Encrypt / Sign Data
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Encrypting and signing data is pretty straight forward as well.
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```
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EncryptionStream encryptor = PGPainless.createEncryptor()
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.onOutputStream(targetOuputStream)
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.toRecipients(publicKeyRings)
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.usingSecureAlgorithms()
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.signWith(secretKeyDecryptor, signingKeyRing)
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.noArmor();
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```
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The resulting `EncryptionStream` can then be used to encrypt data like follows:
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```
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Streams.pipeAll(sourceInputStream, encryptor);
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sourceInputStream.close();
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encryptor.close();
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```
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The encrypted data will be written to the provided `targetOutputStream`.
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Additionally you can get information about the encrypted data by calling
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```
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PainlessResult result = encryptor.getResult();
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```
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That object will contain information like to which keys the message is encrypted, which keys were used for signing and so on.
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### Decrypt / Verify Encrypted Data
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To process incoming encrypted / signed data, just do the following:
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```
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DecryptionStream decryptor = PGPainless.createDecryptor()
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.onInputStream(sourceInputStream) // insert encrypted data here
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.decryptWith(secretKeyDecryptor, secretKey)
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.verifyWith(trustedKeyIds, senderKeys)
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.ignoreMissingPublicKeys()
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.build();
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```
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Again, the resulting `DecryptionStream` can be used like a normal stream.
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```
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Streams.pipeAll(decryptor, targetOutputStream);
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decryptor.close();
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```
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*After* the `DecryptionStream` was closed, you can get metadata about the processed data by retrieving the `PainlessResult`.
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Again, this object will contain information about how the message was encrypted, who signed it and so on.
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```
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PainlessResult result = decryptor.getResult();
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```
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## About
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PGPainless is a by-product of my [Summer of Code 2018 project](https://vanitasvitae.github.io/GSOC2018/).
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For that project I was in need of a simple to use OpenPGP library.
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Originally I was going to use [Bouncy-GPG](https://github.com/neuhalje/bouncy-gpg) for my project,
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but ultimately I decided to create my own OpenPGP library which better fits my needs.
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However, PGPainless is heavily influenced by Bouncy-GPG and I would definitely recommend you to
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use it instead of PGPainless if you want a more mature, better tested code base.
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