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Add comments to OpenPGPKeyVersion

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Paul Schaub 2025-02-28 10:39:29 +01:00
parent f70792f92d
commit 714b5bd9c9
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
1 changed files with 40 additions and 0 deletions
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pgpainless-core/src/main/kotlin/org/pgpainless/algorithm/OpenPGPKeyVersion.kt
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@ -5,9 +5,49 @@
package org.pgpainless.algorithm
enum class OpenPGPKeyVersion(val numeric: Int) {
// Version 2 packets are identical in format to Version 3 packets, but are generated by
// PGP 2.5 or before. V2 packets are deprecated and they MUST NOT be generated.
/**
* Version 3 packets were first generated by PGP 2.6.
* Version 3 keys are deprecated. They contain three weaknesses.
* First, it is relatively easy to construct a version 3 key that has the same Key ID as
* any other key because the Key ID is simply the low 64 bits of the public modulus.
* Second, because the fingerprint of a version 3 key hashes the key material, but not
* its length, there is an increased opportunity for fingerprint collisions.
* Third, there are weaknesses in the MD5 hash algorithm that cause developers to prefer
* other algorithms.
*/
@Deprecated("V3 keys are deprecated.") v3(3),
/**
* Version 4 packets are used in RFC2440, RFC4880, RFC9580.
* The version 4 format is widely supported by various implementations.
*
* @see [RFC2440](https://www.rfc-editor.org/rfc/rfc2440.html)
* @see [RFC4880](https://www.rfc-editor.org/rfc/rfc4880.html)
* @see [RFC9580](https://www.rfc-editor.org/rfc/rfc9580.html)
*/
v4(4),
/**
* "V5"-keys are introduced in the LibrePGP document.
* These are NOT OpenPGP keys and are primarily supported by GnuPG and RNP.
*
* @see [LibrePGP](https://datatracker.ietf.org/doc/draft-koch-librepgp/)
*/
librePgp(5),
/**
* Version 6 packets are introduced in RFC9580.
* The version 6 format is similar to the version 4 format except for the addition of
* a count for the key material. This count helps parsing Secret Key packets (which
* are an extension of the Public Key packet format) in the case of an unknown algorithm.
* In addition, fingerprints of version 6 keys are calculated differently from version 4 keys,
* preventing the KOpenPGP attack.
*
* @see [RFC9580](https://www.rfc-editor.org/rfc/rfc9580.html)
*/
v6(6),
;