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Kotlin conversion: KeyAccessor

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This commit is contained in:
Paul Schaub 2023-09-07 15:56:58 +02:00
parent ff61682743
commit 0e7ea610c0
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
3 changed files with 90 additions and 167 deletions
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167
pgpainless-core/src/main/java/org/pgpainless/key/info/KeyAccessor.java
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@ -1,167 +0,0 @@
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.key.info;
import java.util.Set;
import javax.annotation.Nonnull;
import org.bouncycastle.openpgp.PGPSignature;
import org.pgpainless.algorithm.CompressionAlgorithm;
import org.pgpainless.algorithm.HashAlgorithm;
import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
import org.pgpainless.key.SubkeyIdentifier;
import org.pgpainless.signature.subpackets.SignatureSubpacketsUtil;
public abstract class KeyAccessor {
protected final KeyRingInfo info;
protected final SubkeyIdentifier key;
KeyAccessor(@Nonnull KeyRingInfo info, @Nonnull SubkeyIdentifier key) {
this.info = info;
this.key = key;
}
/**
* Depending on the way we address the key (key-id or user-id), return the respective {@link PGPSignature}
* which contains the algorithm preferences we are going to use.
* <p>
* If we address a key via its user-id, we want to rely on the algorithm preferences in the user-id certification,
* while we would instead rely on those in the direct-key signature if we'd address the key by key-id.
*
* @return signature
*/
@Nonnull
public abstract PGPSignature getSignatureWithPreferences();
/**
* Return preferred symmetric key encryption algorithms.
*
* @return preferred symmetric algorithms
*/
@Nonnull
public Set<SymmetricKeyAlgorithm> getPreferredSymmetricKeyAlgorithms() {
return SignatureSubpacketsUtil.parsePreferredSymmetricKeyAlgorithms(getSignatureWithPreferences());
}
/**
* Return preferred hash algorithms.
*
* @return preferred hash algorithms
*/
@Nonnull
public Set<HashAlgorithm> getPreferredHashAlgorithms() {
return SignatureSubpacketsUtil.parsePreferredHashAlgorithms(getSignatureWithPreferences());
}
/**
* Return preferred compression algorithms.
*
* @return preferred compression algorithms
*/
@Nonnull
public Set<CompressionAlgorithm> getPreferredCompressionAlgorithms() {
return SignatureSubpacketsUtil.parsePreferredCompressionAlgorithms(getSignatureWithPreferences());
}
/**
* Address the key via a user-id (e.g. "Alice &lt;alice@wonderland.lit&gt;").
* In this case we are sourcing preferred algorithms from the user-id certification first.
*/
public static class ViaUserId extends KeyAccessor {
private final String userId;
/**
* Access a key via user-id.
*
* @param info info about a key at a given date
* @param key id of the subkey
* @param userId user-id
*/
public ViaUserId(@Nonnull KeyRingInfo info,
@Nonnull SubkeyIdentifier key,
@Nonnull String userId) {
super(info, key);
this.userId = userId;
}
@Override
@Nonnull
public PGPSignature getSignatureWithPreferences() {
PGPSignature signature = info.getLatestUserIdCertification(userId);
if (signature != null) {
return signature;
}
throw new IllegalStateException("No valid user-id certification signature found for '" + userId + "'.");
}
}
/**
* Address the key via key-id.
* In this case we are sourcing preferred algorithms from the keys direct-key signature first.
*/
public static class ViaKeyId extends KeyAccessor {
/**
* Address the key via key-id.
* @param info info about the key at a given date
* @param key key-id
*/
public ViaKeyId(@Nonnull KeyRingInfo info,
@Nonnull SubkeyIdentifier key) {
super(info, key);
}
@Override
@Nonnull
public PGPSignature getSignatureWithPreferences() {
String primaryUserId = info.getPrimaryUserId();
// If the key is located by Key ID, the algorithm of the primary User ID of the key provides the
// preferred symmetric algorithm.
PGPSignature signature = null;
if (primaryUserId != null) {
signature = info.getLatestUserIdCertification(primaryUserId);
}
if (signature == null) {
signature = info.getLatestDirectKeySelfSignature();
}
if (signature == null) {
throw new IllegalStateException("No valid signature found.");
}
return signature;
}
}
public static class SubKey extends KeyAccessor {
public SubKey(@Nonnull KeyRingInfo info,
@Nonnull SubkeyIdentifier key) {
super(info, key);
}
@Override
@Nonnull
public PGPSignature getSignatureWithPreferences() {
PGPSignature signature;
if (key.getPrimaryKeyId() == key.getSubkeyId()) {
signature = info.getLatestDirectKeySelfSignature();
if (signature == null && info.getPrimaryUserId() != null) {
signature = info.getLatestUserIdCertification(info.getPrimaryUserId());
}
} else {
signature = info.getCurrentSubkeyBindingSignature(key.getSubkeyId());
}
if (signature == null) {
throw new IllegalStateException("No valid signature found.");
}
return signature;
}
}
}

2
pgpainless-core/src/main/kotlin/org/pgpainless/key/SubkeyIdentifier.kt
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@ -31,6 +31,8 @@ class SubkeyIdentifier(
val subkeyId = subkeyFingerprint.keyId
val primaryKeyId = primaryKeyFingerprint.keyId
val isPrimaryKey = keyId == subkeyId
fun matches(fingerprint: OpenPgpFingerprint) =
primaryKeyFingerprint == fingerprint || subkeyFingerprint == fingerprint

88
pgpainless-core/src/main/kotlin/org/pgpainless/key/info/KeyAccessor.kt Normal file
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@ -0,0 +1,88 @@
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.key.info
import org.bouncycastle.openpgp.PGPSignature
import org.pgpainless.algorithm.CompressionAlgorithm
import org.pgpainless.algorithm.HashAlgorithm
import org.pgpainless.algorithm.SymmetricKeyAlgorithm
import org.pgpainless.key.SubkeyIdentifier
import org.pgpainless.signature.subpackets.SignatureSubpacketsUtil
abstract class KeyAccessor(
protected val info: KeyRingInfo,
protected val key: SubkeyIdentifier
) {
/**
* Depending on the way we address the key (key-id or user-id), return the respective [PGPSignature]
* which contains the algorithm preferences we are going to use.
* <p>
* If we address a key via its user-id, we want to rely on the algorithm preferences in the user-id certification,
* while we would instead rely on those in the direct-key signature if we'd address the key by key-id.
*
* @return signature
*/
abstract val signatureWithPreferences: PGPSignature
/**
* Preferred symmetric key encryption algorithms.
*/
val preferredSymmetricKeyAlgorithms: Set<SymmetricKeyAlgorithm>
get() = SignatureSubpacketsUtil.parsePreferredSymmetricKeyAlgorithms(signatureWithPreferences)
/**
* Preferred hash algorithms.
*/
val preferredHashAlgorithms: Set<HashAlgorithm>
get() = SignatureSubpacketsUtil.parsePreferredHashAlgorithms(signatureWithPreferences)
/**
* Preferred compression algorithms.
*/
val preferredCompressionAlgorithms: Set<CompressionAlgorithm>
get() = SignatureSubpacketsUtil.parsePreferredCompressionAlgorithms(signatureWithPreferences)
/**
* Address the key via a user-id (e.g. `Alice <alice@wonderland.lit>`).
* In this case we are sourcing preferred algorithms from the user-id certification first.
*/
class ViaUserId(info: KeyRingInfo, key: SubkeyIdentifier, private val userId: CharSequence): KeyAccessor(info, key) {
override val signatureWithPreferences: PGPSignature
get() = checkNotNull(info.getLatestUserIdCertification(userId.toString())) {
"No valid user-id certification signature found for '$userId'."
}
}
/**
* Address the key via key-id.
* In this case we are sourcing preferred algorithms from the keys direct-key signature first.
*/
class ViaKeyId(info: KeyRingInfo, key: SubkeyIdentifier) : KeyAccessor(info, key) {
override val signatureWithPreferences: PGPSignature
get() {
// If the key is located by Key ID, the algorithm of the primary User ID of the key provides the
// preferred symmetric algorithm.
info.primaryUserId?.let {
userId -> info.getLatestUserIdCertification(userId).let { if (it != null) return it }
}
return checkNotNull(info.latestDirectKeySelfSignature) { "No valid signature found." }
}
}
class SubKey(info: KeyRingInfo, key: SubkeyIdentifier): KeyAccessor(info, key) {
override val signatureWithPreferences: PGPSignature
get() = checkNotNull(
if (key.isPrimaryKey) {
info.latestDirectKeySelfSignature ?:
info.primaryUserId?.let { info.getLatestUserIdCertification(it) }
} else {
info.getCurrentSubkeyBindingSignature(key.subkeyId)
}
) { "No valid signature found." }
}
}