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Add further information about key protectors to documentation

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Paul Schaub 2022-08-31 21:59:40 +02:00
parent 328b8ccf8a
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Signed by: vanitasvitae
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28
docs/source/pgpainless-core/passphrase.md
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@ -42,7 +42,7 @@ There are certain operations that require you to provide the passphrase for a ke
Examples are decryption of messages, or creating signatures / certifications. Examples are decryption of messages, or creating signatures / certifications.
The primary way of telling PGPainless, which password to use for a certain key is the `SecretKeyRingProtector` The primary way of telling PGPainless, which password to use for a certain key is the `SecretKeyRingProtector`
interface. interface which maps `Passphrases` to (sub-)keys.
There are multiple implementations of this interface, which may or may not suite your needs: There are multiple implementations of this interface, which may or may not suite your needs:
```java ```java
@ -59,11 +59,29 @@ CachingSecretKeyRingProtector flexible = SecretKeyRingProtector
.defaultSecretKeyRingProtector(passphraseCallback); .defaultSecretKeyRingProtector(passphraseCallback);
``` ```
The last example shows how to instantiate the `CachingSecretKeyRingProtector` with a `SecretKeyPassphraseProvider`. `SecretKeyRingProtector.unprotectedKeys()` will return an empty passphrase for any key.
As the name suggests, the `CachingSecretKeyRingProtector` caches passphrases in a map. It is best used when dealing with unencrypted secret keys.
`SecretKeyRingProtector.unlockAnyKeyWith(passphrase)` will return the same exact passphrase for any given key.
You should use this if you have a single key with a static passphrase.
The last example shows how to instantiate the `CachingSecretKeyRingProtector` with a `SecretKeyPassphraseProvider`
as argument.
As the name suggests, the `CachingSecretKeyRingProtector` caches passphrases it knows about in a map.
That way, you only have to provide the passphrase for a certain key only once, after which it will be remembered.
If you try to unlock a protected secret key for which no passphrase is cached, the `getPassphraseFor()` method of If you try to unlock a protected secret key for which no passphrase is cached, the `getPassphraseFor()` method of
the `SecretKeyPassphraseProvider` will be called to interactively ask for the missing passphrase. Afterwards, the the `SecretKeyPassphraseProvider` callback will be called to interactively ask for the missing passphrase.
acquired passphrase will be cached for future use. Afterwards, the acquired passphrase will be cached for future use.
:::{note}
While especially the `CachingSecretKeyRingProtector` can handle multiple keys without problems, it is advised
to use individual `SecretKeyRingProtector` objects per key.
The reason for this is, that internally the 64bit key-id is used to resolve `Passphrase` objects and collisions are not
unlikely in this key-space.
Furthermore, multiple OpenPGP keys could contain the same subkey, but with different passphrases set.
If the same `SecretKeyRingProtector` is used for two OpenPGP keys with the same subkey, but different passwords,
the key-id collision will cause the password to be overwritten for one of the keys, which might result in issues.
:::
Most `SecretKeyRingProtector` implementations can be instantiated with custom `KeyRingProtectionSettings`. Most `SecretKeyRingProtector` implementations can be instantiated with custom `KeyRingProtectionSettings`.
By default, most implementations use `KeyRingProtectionSettings.secureDefaultSettings()` which corresponds to iterated By default, most implementations use `KeyRingProtectionSettings.secureDefaultSettings()` which corresponds to iterated