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