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Kotlin conversion: Trustworthiness

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This commit is contained in:
Paul Schaub 2023-08-04 17:07:02 +02:00
parent 584a4aed93
commit fb39c37228
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
2 changed files with 140 additions and 188 deletions
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188
pgpainless-core/src/main/java/org/pgpainless/algorithm/Trustworthiness.java
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// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.algorithm;
/**
* Facade class for {@link org.bouncycastle.bcpg.sig.TrustSignature}.
* A trust signature subpacket marks the trustworthiness of a certificate and defines its capabilities to act
* as a trusted introducer.
*/
public class Trustworthiness {
private final int amount;
private final int depth;
public static final int THRESHOLD_FULLY_CONVINCED = 120; // greater or equal is fully trusted
public static final int MARGINALLY_CONVINCED = 60; // default value for marginally convinced
public static final int NOT_TRUSTED = 0; // 0 is not trusted
public Trustworthiness(int amount, int depth) {
this.amount = capAmount(amount);
this.depth = capDepth(depth);
}
/**
* Get the trust amount.
* This value means how confident the issuer of the signature is in validity of the binding.
*
* @return trust amount
*/
public int getAmount() {
return amount;
}
/**
* Get the depth of the trust signature.
* This value controls, whether the certificate can act as a trusted introducer.
*
* @return depth
*/
public int getDepth() {
return depth;
}
/**
* Returns true, if the trust amount is equal to 0.
* This means the key is not trusted.
*
* Otherwise return false
* @return true if untrusted
*/
public boolean isNotTrusted() {
return getAmount() == NOT_TRUSTED;
}
/**
* Return true if the certificate is at least marginally trusted.
* That is the case, if the trust amount is greater than 0.
*
* @return true if the cert is at least marginally trusted
*/
public boolean isMarginallyTrusted() {
return getAmount() > NOT_TRUSTED;
}
/**
* Return true if the certificate is fully trusted. That is the case if the trust amount is
* greater than or equal to 120.
*
* @return true if the cert is fully trusted
*/
public boolean isFullyTrusted() {
return getAmount() >= THRESHOLD_FULLY_CONVINCED;
}
/**
* Return true, if the cert is an introducer. That is the case if the depth is greater 0.
*
* @return true if introducer
*/
public boolean isIntroducer() {
return getDepth() >= 1;
}
/**
* Return true, if the certified cert can introduce certificates with trust depth of <pre>otherDepth</pre>.
*
* @param otherDepth other certifications trust depth
* @return true if the cert can introduce the other
*/
public boolean canIntroduce(int otherDepth) {
return getDepth() > otherDepth;
}
/**
* Return true, if the certified cert can introduce certificates with the given <pre>other</pre> trust depth.
*
* @param other other certificates trust depth
* @return true if the cert can introduce the other
*/
public boolean canIntroduce(Trustworthiness other) {
return canIntroduce(other.getDepth());
}
/**
* This means that we are fully convinced of the trustworthiness of the key.
*
* @return builder
*/
public static Builder fullyTrusted() {
return new Builder(THRESHOLD_FULLY_CONVINCED);
}
/**
* This means that we are marginally (partially) convinced of the trustworthiness of the key.
*
* @return builder
*/
public static Builder marginallyTrusted() {
return new Builder(MARGINALLY_CONVINCED);
}
/**
* This means that we do not trust the key.
* Can be used to overwrite previous trust.
*
* @return builder
*/
public static Builder untrusted() {
return new Builder(NOT_TRUSTED);
}
public static final class Builder {
private final int amount;
private Builder(int amount) {
this.amount = amount;
}
/**
* The key is a trusted introducer (depth 1).
* Certifications made by this key are considered trustworthy.
*
* @return trust
*/
public Trustworthiness introducer() {
return new Trustworthiness(amount, 1);
}
/**
* The key is a meta introducer (depth 2).
* This key can introduce trusted introducers of depth 1.
*
* @return trust
*/
public Trustworthiness metaIntroducer() {
return new Trustworthiness(amount, 2);
}
/**
* The key is a meta introducer of depth <pre>n</pre>.
* This key can introduce meta introducers of depth <pre>n - 1</pre>.
*
* @param n depth
* @return trust
*/
public Trustworthiness metaIntroducerOfDepth(int n) {
return new Trustworthiness(amount, n);
}
}
private static int capAmount(int amount) {
if (amount < 0 || amount > 255) {
throw new IllegalArgumentException("Trust amount MUST be a value between 0 and 255");
}
return amount;
}
private static int capDepth(int depth) {
if (depth < 0 || depth > 255) {
throw new IllegalArgumentException("Trust depth MUST be a value between 0 and 255");
}
return depth;
}
}

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pgpainless-core/src/main/java/org/pgpainless/algorithm/Trustworthiness.kt Normal file
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.algorithm
/**
* Facade class for [org.bouncycastle.bcpg.sig.TrustSignature].
* A trust signature subpacket marks the trustworthiness of a certificate and defines its capabilities to act
* as a trusted introducer.
*/
class Trustworthiness(amount: Int, depth: Int) {
val depth = capDepth(depth)
val amount = capAmount(amount)
/**
* Returns true, if the trust amount is equal to 0.
* This means the key is not trusted.
*
* Otherwise return false
* @return true if untrusted
*/
fun isNotTrusted() = amount == NOT_TRUSTED
/**
* Return true if the certificate is at least marginally trusted.
* That is the case, if the trust amount is greater than 0.
*
* @return true if the cert is at least marginally trusted
*/
fun isMarginallyTrusted() = amount > NOT_TRUSTED
/**
* Return true if the certificate is fully trusted. That is the case if the trust amount is
* greater than or equal to 120.
*
* @return true if the cert is fully trusted
*/
fun isFullyTrusted() = amount >= THRESHOLD_FULLY_CONVINCED
/**
* Return true, if the cert is an introducer. That is the case if the depth is greater 0.
*
* @return true if introducer
*/
fun isIntroducer() = depth >= 1
/**
* Return true, if the certified cert can introduce certificates with trust depth of <pre>otherDepth</pre>.
*
* @param otherDepth other certifications trust depth
* @return true if the cert can introduce the other
*/
fun canIntroduce(otherDepth: Int) = depth > otherDepth
/**
* Return true, if the certified cert can introduce certificates with the given <pre>other</pre> trust depth.
*
* @param other other certificates trust depth
* @return true if the cert can introduce the other
*/
fun canIntroduce(other: Trustworthiness) = canIntroduce(other.depth)
companion object {
const val THRESHOLD_FULLY_CONVINCED = 120 // greater or equal is fully trusted
const val MARGINALLY_CONVINCED = 60 // default value for marginally convinced
const val NOT_TRUSTED = 0 // 0 is not trusted
/**
* This means that we are fully convinced of the trustworthiness of the key.
*
* @return builder
*/
@JvmStatic
fun fullyTrusted() = Builder(THRESHOLD_FULLY_CONVINCED)
/**
* This means that we are marginally (partially) convinced of the trustworthiness of the key.
*
* @return builder
*/
@JvmStatic
fun marginallyTrusted() = Builder(MARGINALLY_CONVINCED)
/**
* This means that we do not trust the key.
* Can be used to overwrite previous trust.
*
* @return builder
*/
@JvmStatic
fun untrusted() = Builder(NOT_TRUSTED)
@JvmStatic
private fun capAmount(amount: Int): Int {
if (amount !in 0..255) {
throw IllegalArgumentException("Trust amount MUST be a value between 0 and 255")
}
return amount
}
@JvmStatic
private fun capDepth(depth: Int): Int {
if (depth !in 0..255) {
throw IllegalArgumentException("Trust depth MUST be a value between 0 and 255")
}
return depth
}
}
class Builder(val amount: Int) {
/**
* The key is a trusted introducer (depth 1).
* Certifications made by this key are considered trustworthy.
*
* @return trust
*/
fun introducer() = Trustworthiness(amount, 1)
/**
* The key is a meta introducer (depth 2).
* This key can introduce trusted introducers of depth 1.
*
* @return trust
*/
fun metaIntroducer() = Trustworthiness(amount, 2)
/**
* The key is a meta introducer of depth <pre>n</pre>.
* This key can introduce meta introducers of depth <pre>n - 1</pre>.
*
* @param n depth
* @return trust
*/
fun metaIntroducerOfDepth(d: Int) = Trustworthiness(amount, d)
}
}