64 lines
2.7 KiB
Java
64 lines
2.7 KiB
Java
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package org.bouncycastle.jcajce.provider.symmetric;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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import org.bouncycastle.asn1.ASN1Primitive;
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import org.bouncycastle.asn1.cms.GCMParameters;
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import org.bouncycastle.util.Integers;
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/* loaded from: classes6.dex */
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class GcmSpecUtil {
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static final Class gcmSpecClass = lookup("javax.crypto.spec.GCMParameterSpec");
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private static Class lookup(String str) {
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try {
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return GcmSpecUtil.class.getClassLoader().loadClass(str);
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} catch (Exception unused) {
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return null;
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}
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}
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/* JADX INFO: Access modifiers changed from: package-private */
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public static boolean isGcmSpec(AlgorithmParameterSpec algorithmParameterSpec) {
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Class cls = gcmSpecClass;
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return cls != null && cls.isInstance(algorithmParameterSpec);
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}
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/* JADX INFO: Access modifiers changed from: package-private */
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public static boolean isGcmSpec(Class cls) {
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return gcmSpecClass == cls;
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}
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/* JADX INFO: Access modifiers changed from: package-private */
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public static boolean gcmSpecExists() {
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return gcmSpecClass != null;
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}
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/* JADX INFO: Access modifiers changed from: package-private */
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public static AlgorithmParameterSpec extractGcmSpec(ASN1Primitive aSN1Primitive) throws InvalidParameterSpecException {
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try {
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GCMParameters gCMParameters = GCMParameters.getInstance(aSN1Primitive);
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return (AlgorithmParameterSpec) gcmSpecClass.getConstructor(Integer.TYPE, byte[].class).newInstance(Integers.valueOf(gCMParameters.getIcvLen() << 3), gCMParameters.getNonce());
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} catch (NoSuchMethodException unused) {
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throw new InvalidParameterSpecException("No constructor found!");
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} catch (Exception e) {
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StringBuilder sb = new StringBuilder("Construction failed: ");
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sb.append(e.getMessage());
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throw new InvalidParameterSpecException(sb.toString());
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}
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}
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/* JADX INFO: Access modifiers changed from: package-private */
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public static GCMParameters extractGcmParameters(AlgorithmParameterSpec algorithmParameterSpec) throws InvalidParameterSpecException {
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try {
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Class cls = gcmSpecClass;
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return new GCMParameters((byte[]) cls.getDeclaredMethod("getIV", new Class[0]).invoke(algorithmParameterSpec, new Object[0]), ((Integer) cls.getDeclaredMethod("getTLen", new Class[0]).invoke(algorithmParameterSpec, new Object[0])).intValue() / 8);
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} catch (Exception unused) {
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throw new InvalidParameterSpecException("Cannot process GCMParameterSpec");
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}
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}
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GcmSpecUtil() {
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}
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}
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