121 lines
4.1 KiB
Java
121 lines
4.1 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.securitytoken;
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import androidx.annotation.RestrictTo;
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import com.google.auto.value.AutoValue;
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import org.bouncycastle.bcpg.PublicKeyAlgorithmTags;
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import org.sufficientlysecure.keychain.service.SaveKeyringParcel;
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import org.sufficientlysecure.keychain.service.SaveKeyringParcel.SubkeyAdd;
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// OpenPGP Card Spec: Algorithm Attributes: RSA
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@AutoValue
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public abstract class RsaKeyFormat extends KeyFormat {
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public static final int ALGORITHM_ID = PublicKeyAlgorithmTags.RSA_GENERAL;
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public abstract int modulusLength();
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public abstract int exponentLength();
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public abstract RsaImportFormat rsaImportFormat();
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public static RsaKeyFormat getInstance(int modulusLength, int exponentLength, RsaImportFormat from) {
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return new AutoValue_RsaKeyFormat(modulusLength, exponentLength, from);
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}
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public static RsaKeyFormat getInstanceDefault2048BitFormat() {
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return getInstance(2048, 4, RsaImportFormat.CRT_WITH_MODULUS);
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}
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public RsaKeyFormat withModulus(int modulus) {
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return RsaKeyFormat.getInstance(modulus, exponentLength(), rsaImportFormat());
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}
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public static KeyFormat getInstanceFromBytes(byte[] bytes) {
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if (bytes.length < 6) {
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throw new IllegalArgumentException("Bad length for RSA attributes");
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}
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int modulusLength = bytes[1] << 8 | bytes[2];
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int exponentLength = bytes[3] << 8 | bytes[4];
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RsaImportFormat importFormat = RsaImportFormat.from(bytes[5]);
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return getInstance(modulusLength, exponentLength, importFormat);
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}
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@Override
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public byte[] toBytes(KeyType slot) {
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int i = 0;
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byte[] attrs = new byte[6];
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attrs[i++] = (byte) ALGORITHM_ID;
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attrs[i++] = (byte) ((modulusLength() >> 8) & 0xff);
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attrs[i++] = (byte) (modulusLength() & 0xff);
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attrs[i++] = (byte) ((exponentLength() >> 8) & 0xff);
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attrs[i++] = (byte) (exponentLength() & 0xff);
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attrs[i] = rsaImportFormat().getImportFormat();
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return attrs;
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}
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public enum RsaImportFormat {
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STANDARD((byte) 0x00, false, false),
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STANDARD_WITH_MODULUS((byte) 0x01, false, true),
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CRT((byte) 0x02, true, false),
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CRT_WITH_MODULUS((byte) 0x03, true, true);
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private byte importFormat;
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private boolean includeModulus;
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private boolean includeCrt;
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RsaImportFormat(byte importFormat, boolean includeCrt, boolean includeModulus) {
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this.importFormat = importFormat;
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this.includeModulus = includeModulus;
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this.includeCrt = includeCrt;
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}
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public static RsaImportFormat from(byte importFormatByte) {
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for (RsaImportFormat format : values()) {
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if (format.importFormat == importFormatByte) {
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return format;
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}
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}
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return null;
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}
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public byte getImportFormat() {
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return importFormat;
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}
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public boolean isIncludeModulus() {
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return includeModulus;
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}
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public boolean isIncludeCrt() {
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return includeCrt;
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}
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}
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public void addToSaveKeyringParcel(SaveKeyringParcel.Builder builder, int keyFlags) {
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builder.addSubkeyAdd(SubkeyAdd.createSubkeyAdd(SaveKeyringParcel.Algorithm.RSA,
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modulusLength(), null, keyFlags, 0L));
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}
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}
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