mirror of
https://github.com/pgpainless/pgpainless.git
synced 2024-11-12 23:42:06 +01:00
101 lines
4.6 KiB
Markdown
101 lines
4.6 KiB
Markdown
|
# PGPainless In-Depth: Generate Keys
|
||
|
|
|
||
|
|
There are two API endpoints for generating OpenPGP keys using `pgpainless-core`:
|
||
|
|
|
||
|
|
`PGPainless.generateKeyRing()` presents a selection of pre-configured OpenPGP key archetypes:
|
||
|
|
|
||
|
|
```java
|
||
|
|
// Modern, EC-based OpenPGP key with dedicated primary certification key
|
||
|
|
// This method is recommended by the authors
|
||
|
|
PGPSecretKeyRing secretKey = PGPainless.generateKeyRing()
|
||
|
|
.modernKeyRing(
|
||
|
|
"Alice <alice@pgpainless.org>",
|
||
|
|
Passphrase.fromPassword("sw0rdf1sh"));
|
||
|
|
|
||
|
|
// Simple, EC-based OpenPGP key with combined certification and signing key
|
||
|
|
// plus encryption subkey
|
||
|
|
PGPSecretKeyRing secretKey = PGPainless.generateKeyRing()
|
||
|
|
.simpleEcKeyRing(
|
||
|
|
"Alice <alice@pgpainless.org>",
|
||
|
|
Passphrase.fromPassword("0r4ng3"));
|
||
|
|
|
||
|
|
// Simple, RSA OpenPGP key made of a single RSA key used for all operations
|
||
|
|
PGPSecretKeyRing secretKey = PGPainless.generateKeyRing()
|
||
|
|
.simpleRsaKeyRing(
|
||
|
|
"Alice <alice@pgpainless.org>",
|
||
|
|
RsaLength._4096, Passphrase.fromPassword("m0nk3y")):
|
||
|
|
```
|
||
|
|
|
||
|
|
If you have special requirements on algorithms you can use `PGPainless.buildKeyRing()` instead, which offers more
|
||
|
|
control over parameters:
|
||
|
|
|
||
|
|
```java
|
||
|
|
// Customized key
|
||
|
|
|
||
|
|
// Specification for primary key
|
||
|
|
KeySpecBuilder primaryKeySpec = KeySpec.getBuilder(
|
||
|
|
KeyType.RSA(RsaLength._8192), // 8192 bits RSA key
|
||
|
|
KeyFlag.CERTIFY_OTHER) // used for certification
|
||
|
|
// optionally override algorithm preferences
|
||
|
|
.overridePreferredCompressionAlgorithms(CompressionAlgorithm.ZLIB)
|
||
|
|
.overridePreferredHashAlgorithms(HashAlgorithm.SHA512, HashAlgorithm.SHA384)
|
||
|
|
.overridePreferredSymmetricKeyAlgorithms(SymmetricKeyAlgorithm.AES256);
|
||
|
|
|
||
|
|
// Specification for a signing subkey
|
||
|
|
KeySpecBuilder signingSubKeySpec = KeySpec.getBuilder(
|
||
|
|
KeyType.ECDSA(EllipticCurve._P256), // P-256 ECDSA key
|
||
|
|
KeyFlag.SIGN_DATA); // Used for signing
|
||
|
|
|
||
|
|
// Specification for an encryption subkey
|
||
|
|
KeySpecBuilder encryptionSubKeySpec = KeySpec.getBuilder(
|
||
|
|
KeyType.ECDH(EllipticCurve._P256),
|
||
|
|
KeyFlag.ENCRYPT_COMMS, KeyFlag.ENCRYPT_STORAGE);
|
||
|
|
|
||
|
|
// Build the key itself
|
||
|
|
PGPSecretKeyRing secretKey = PGPainless.buildKeyRing()
|
||
|
|
.setPrimaryKey(primaryKeySpec)
|
||
|
|
.addSubkey(signingSubKeySpec)
|
||
|
|
.addSubkey(encryptionSubKeySpec)
|
||
|
|
.addUserId("Juliet <juliet@montague.lit>") // Primary User-ID
|
||
|
|
.addUserId("xmpp:juliet@capulet.lit") // Additional User-ID
|
||
|
|
.setPassphrase(Passphrase.fromPassword("romeo_oh_Romeo<3")) // passphrase protection
|
||
|
|
.build();
|
||
|
|
```
|
||
|
|
|
||
|
|
To specify, which algorithm to use for a single (sub) key, `KeySpec.getBuilder(_)` can be used, passing a `KeyType`,
|
||
|
|
as well as some `KeyFlag`s as argument.
|
||
|
|
|
||
|
|
`KeyType` defines an algorithm and its parameters, e.g. RSA with a certain key size, or ECDH over a certain
|
||
|
|
elliptic curve.
|
||
|
|
Currently, PGPainless supports the following `KeyType`s:
|
||
|
|
* `KeyType.RSA(_)`: Signing, Certification, Encryption
|
||
|
|
* `KeyType.ECDH(_)`: Encryption
|
||
|
|
* `KeyType.ECDSA(_)`: Signing, Certification
|
||
|
|
* `KeyType.EDDSA(_)`: Signing, Certification
|
||
|
|
* `KeyType.XDH(_)`: Encryption
|
||
|
|
|
||
|
|
The `KeyFlag`s are used to specify, how the key will be used later on. A signing key can only be used for signing,
|
||
|
|
if it carries the `KeyFlag.SIGN_DATA`.
|
||
|
|
A key can carry multiple key flags.
|
||
|
|
|
||
|
|
It is possible to override the default algorithm preferences used by PGPainless with custom preferences.
|
||
|
|
An algorithm preference list contains algorithms from most to least preferred.
|
||
|
|
|
||
|
|
Every OpenPGP key MUST have a primary key. The primary key MUST be capable of certification, so you MUST use an
|
||
|
|
algorithm that can be used to generate signatures.
|
||
|
|
The primary key can be set by calling `setPrimaryKey(primaryKeySpec)`.
|
||
|
|
|
||
|
|
Furthermore, an OpenPGP key can contain zero or more subkeys.
|
||
|
|
Those can be set by repeatedly calling `addSubkey(subkeySpec)`.
|
||
|
|
|
||
|
|
OpenPGP keys are usually bound to User-IDs like names and/or email addresses.
|
||
|
|
There can be multiple user-ids bound to a key, in which case the very first User-ID will be marked as primary.
|
||
|
|
To add a User-ID to the key, call `addUserId(userId)`.
|
||
|
|
|
||
|
|
By default, keys do not have an expiration date. This can be changed by setting an expiration date using
|
||
|
|
`setExpirationDate(date)`.
|
||
|
|
|
||
|
|
To enable password protection for the OpenPGP key, you can call `setPassphrase(passphrase)`.
|
||
|
|
If this method is not called, or if the passed in `Passphrase` is empty, the key will be unprotected.
|
||
|
|
|
||
|
|
Finally, calling `build()` will generate a fresh OpenPGP key according to the specifications given.
|