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Kotlin conversion: KeyRingProtectionSettings

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This commit is contained in:
Paul Schaub 2023-08-31 18:28:48 +02:00
parent 55f5bb2645
commit 17abaad186
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
2 changed files with 56 additions and 99 deletions
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99
pgpainless-core/src/main/java/org/pgpainless/key/protection/KeyRingProtectionSettings.java
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@ -1,99 +0,0 @@
// SPDX-FileCopyrightText: 2018 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.key.protection;
import javax.annotation.Nonnull;
import org.pgpainless.algorithm.HashAlgorithm;
import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
/**
* Secret key protection settings for iterated and salted S2K.
*/
public class KeyRingProtectionSettings {
private final SymmetricKeyAlgorithm encryptionAlgorithm;
private final HashAlgorithm hashAlgorithm;
private final int s2kCount;
/**
* Create a {@link KeyRingProtectionSettings} object using the given encryption algorithm, SHA1 and
* 65536 iterations.
*
* @param encryptionAlgorithm encryption algorithm
*/
public KeyRingProtectionSettings(@Nonnull SymmetricKeyAlgorithm encryptionAlgorithm) {
this(encryptionAlgorithm, HashAlgorithm.SHA1, 0x60); // Same s2kCount (encoded) as used in BC.
}
/**
* Constructor for custom salted and iterated S2K protection settings.
* The salt gets randomly chosen by the library each time.
*
* Note, that the s2kCount is the already encoded single-octet number.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-3.7.1.3">Encoding Formula</a>
*
* @param encryptionAlgorithm encryption algorithm
* @param hashAlgorithm hash algorithm
* @param s2kCount encoded s2k iteration count
*/
public KeyRingProtectionSettings(@Nonnull SymmetricKeyAlgorithm encryptionAlgorithm, @Nonnull HashAlgorithm hashAlgorithm, int s2kCount) {
this.encryptionAlgorithm = validateEncryptionAlgorithm(encryptionAlgorithm);
this.hashAlgorithm = hashAlgorithm;
if (s2kCount < 1) {
throw new IllegalArgumentException("s2kCount cannot be less than 1.");
}
this.s2kCount = s2kCount;
}
private static SymmetricKeyAlgorithm validateEncryptionAlgorithm(SymmetricKeyAlgorithm encryptionAlgorithm) {
switch (encryptionAlgorithm) {
case NULL:
throw new IllegalArgumentException("Unencrypted is not allowed here!");
default:
return encryptionAlgorithm;
}
}
/**
* Secure default settings using {@link SymmetricKeyAlgorithm#AES_256}, {@link HashAlgorithm#SHA256}
* and an iteration count of 65536.
*
* @return secure protection settings
*/
public static KeyRingProtectionSettings secureDefaultSettings() {
return new KeyRingProtectionSettings(SymmetricKeyAlgorithm.AES_256, HashAlgorithm.SHA256, 0x60);
}
/**
* Return the encryption algorithm.
*
* @return encryption algorithm
*/
public @Nonnull SymmetricKeyAlgorithm getEncryptionAlgorithm() {
return encryptionAlgorithm;
}
/**
* Return the hash algorithm.
*
* @return hash algorithm
*/
public @Nonnull HashAlgorithm getHashAlgorithm() {
return hashAlgorithm;
}
/**
* Return the (encoded!) s2k iteration count.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-3.7.1.3">Encoding Formula</a>
*
* @return encoded s2k count
*/
public int getS2kCount() {
return s2kCount;
}
}

56
pgpainless-core/src/main/kotlin/org/pgpainless/key/protection/KeyRingProtectionSettings.kt Normal file
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.key.protection
import org.pgpainless.algorithm.HashAlgorithm
import org.pgpainless.algorithm.SymmetricKeyAlgorithm
/**
* Secret key protection settings for iterated and salted S2K.
* The salt gets randomly chosen by the library each time.
* Note, that the s2kCount is the already encoded single-octet number.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-3.7.1.3">Encoding Formula</a>
*
* @param encryptionAlgorithm encryption algorithm
* @param hashAlgorithm hash algorithm
* @param s2kCount encoded (!) s2k iteration count
*/
data class KeyRingProtectionSettings(
val encryptionAlgorithm: SymmetricKeyAlgorithm,
val hashAlgorithm: HashAlgorithm,
val s2kCount: Int
) {
/**
* Create a [KeyRingProtectionSettings] object using the given encryption algorithm, [HashAlgorithm.SHA1] and
* 65536 iterations.
* It is okay to use SHA1 here, since we don't care about collisions.
*
* @param encryptionAlgorithm encryption algorithm
*/
constructor(encryptionAlgorithm: SymmetricKeyAlgorithm): this(encryptionAlgorithm, HashAlgorithm.SHA1, 0x60)
init {
require(encryptionAlgorithm != SymmetricKeyAlgorithm.NULL) {
"Unencrypted is not allowed here!"
}
require(s2kCount > 0) {
"s2kCount cannot be less than 1."
}
}
companion object {
/**
* Secure default settings using [SymmetricKeyAlgorithm.AES_256], [HashAlgorithm.SHA256]
* and an iteration count of 65536.
*
* @return secure protection settings
*/
@JvmStatic
fun secureDefaultSettings() = KeyRingProtectionSettings(SymmetricKeyAlgorithm.AES_256, HashAlgorithm.SHA256, 0x60)
}
}