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Add documentation to GnuDummyKeyUtil

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This commit is contained in:
Paul Schaub 2022-10-28 16:48:49 +02:00
parent 2487e3300a
commit a8d2319d63
1 changed files with 66 additions and 10 deletions
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76
pgpainless-core/src/main/java/org/pgpainless/key/gnu_dummy_s2k/GnuDummyKeyUtil.java
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@ -11,16 +11,26 @@ import org.bouncycastle.bcpg.SecretSubkeyPacket;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRing;
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* This class can be used to remove private keys from secret keys.
*/
public final class GnuDummyKeyUtil {
private GnuDummyKeyUtil() {
}
/**
* Modify the given {@link PGPSecretKeyRing}.
*
* @param secretKeys secret keys
* @return builder
*/
public static Builder modify(PGPSecretKeyRing secretKeys) {
return new Builder(secretKeys);
}
@ -33,19 +43,50 @@ public final class GnuDummyKeyUtil {
this.keys = keys;
}
/**
* Remove all private keys that match the given {@link KeyFilter} from the key ring and replace them with
* GNU_DUMMY keys with S2K protection mode {@link GNUExtension#NO_PRIVATE_KEY}.
*
* @param filter filter to select keys for removal
* @return modified key ring
*/
public PGPSecretKeyRing removePrivateKeys(KeyFilter filter) {
return doIt(GNUExtension.NO_PRIVATE_KEY, null, filter);
return replacePrivateKeys(GNUExtension.NO_PRIVATE_KEY, null, filter);
}
/**
* Remove all private keys that match the given {@link KeyFilter} from the key ring and replace them with
* GNU_DUMMY keys with S2K protection mode {@link GNUExtension#DIVERT_TO_CARD}.
* This method will set the serial number of the card to 0x00000000000000000000000000000000.
*
* NOTE: This method does not actually move any keys to a card.
*
* @param filter filter to select keys for removal
* @return modified key ring
*/
public PGPSecretKeyRing divertPrivateKeysToCard(KeyFilter filter) {
return divertPrivateKeysToCard(filter, new byte[16]);
}
/**
* Remove all private keys that match the given {@link KeyFilter} from the key ring and replace them with
* GNU_DUMMY keys with S2K protection mode {@link GNUExtension#DIVERT_TO_CARD}.
* This method will include the card serial number into the encoded dummy key.
*
* NOTE: This method does not actually move any keys to a card.
*
* @param filter filter to select keys for removal
* @param cardSerialNumber serial number of the card (at most 16 bytes long)
* @return modified key ring
*/
public PGPSecretKeyRing divertPrivateKeysToCard(KeyFilter filter, byte[] cardSerialNumber) {
return doIt(GNUExtension.DIVERT_TO_CARD, cardSerialNumber, filter);
if (cardSerialNumber != null && cardSerialNumber.length > 16) {
throw new IllegalArgumentException("Card serial number length cannot exceed 16 bytes.");
}
return replacePrivateKeys(GNUExtension.DIVERT_TO_CARD, cardSerialNumber, filter);
}
private PGPSecretKeyRing doIt(GNUExtension extension, byte[] serial, KeyFilter filter) {
private PGPSecretKeyRing replacePrivateKeys(GNUExtension extension, byte[] serial, KeyFilter filter) {
byte[] encodedSerial = serial != null ? encodeSerial(serial) : null;
S2K s2k = extensionToS2K(extension);
@ -71,21 +112,19 @@ public final class GnuDummyKeyUtil {
}
}
PGPSecretKeyRing gnuDummyKey = new PGPSecretKeyRing(secretKeyList);
return gnuDummyKey;
return new PGPSecretKeyRing(secretKeyList);
}
private byte[] encodeSerial(byte[] serial) {
private byte[] encodeSerial(@Nonnull byte[] serial) {
byte[] encoded = new byte[serial.length + 1];
encoded[0] = 0x10;
encoded[0] = (byte) (serial.length & 0xff);
System.arraycopy(serial, 0, encoded, 1, serial.length);
return encoded;
}
private S2K extensionToS2K(GNUExtension extension) {
S2K s2k = S2K.gnuDummyS2K(extension == GNUExtension.DIVERT_TO_CARD ?
private S2K extensionToS2K(@Nonnull GNUExtension extension) {
return S2K.gnuDummyS2K(extension == GNUExtension.DIVERT_TO_CARD ?
S2K.GNUDummyParams.divertToCard() : S2K.GNUDummyParams.noPrivateKey());
return s2k;
}
}
@ -99,15 +138,32 @@ public final class GnuDummyKeyUtil {
*/
boolean filter(long keyId);
/**
* Select any key.
* @return filter
*/
static KeyFilter any() {
return keyId -> true;
}
/**
* Select only the given keyId.
*
* @param onlyKeyId only acceptable key id
* @return filter
*/
static KeyFilter only(long onlyKeyId) {
return keyId -> keyId == onlyKeyId;
}
/**
* Select all keyIds which are contained in the given set of ids.
*
* @param ids set of acceptable keyIds
* @return filter
*/
static KeyFilter selected(Collection<Long> ids) {
// noinspection Convert2MethodRef
return keyId -> ids.contains(keyId);
}
}