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Signed-off-by: Appu Goundan <[email protected]>
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/* | ||
* Copyright 2023 The Sigstore Authors. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
package util; | ||
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import com.code_intelligence.jazzer.api.FuzzedDataProvider; | ||
import com.google.common.hash.Hashing; | ||
import dev.sigstore.trustroot.CertificateAuthorities; | ||
import dev.sigstore.trustroot.CertificateAuthority; | ||
import dev.sigstore.trustroot.ImmutableCertificateAuthorities; | ||
import dev.sigstore.trustroot.ImmutableCertificateAuthority; | ||
import dev.sigstore.trustroot.ImmutableLogId; | ||
import dev.sigstore.trustroot.ImmutablePublicKey; | ||
import dev.sigstore.trustroot.ImmutableSubject; | ||
import dev.sigstore.trustroot.ImmutableTransparencyLog; | ||
import dev.sigstore.trustroot.ImmutableTransparencyLogs; | ||
import dev.sigstore.trustroot.ImmutableValidFor; | ||
import dev.sigstore.trustroot.TransparencyLog; | ||
import dev.sigstore.trustroot.TransparencyLogs; | ||
import java.io.ByteArrayInputStream; | ||
import java.net.URI; | ||
import java.security.cert.CertPath; | ||
import java.security.cert.Certificate; | ||
import java.security.cert.CertificateException; | ||
import java.security.cert.CertificateFactory; | ||
import java.time.Instant; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
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public final class Tuf { | ||
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// arbitrarily decided max certificate size in bytes | ||
private static final int MAX_CERT_SIZE = 10240; | ||
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// ecdsa key size in bytes | ||
private static final int ECDSA_KEY_BYTES = 91; | ||
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public static TransparencyLogs transparencyLogsFrom(FuzzedDataProvider data) { | ||
return ImmutableTransparencyLogs.builder().addTransparencyLog(genTlog(data)).build(); | ||
} | ||
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public static CertificateAuthorities certificateAuthoritiesFrom(FuzzedDataProvider data) | ||
throws CertificateException { | ||
return ImmutableCertificateAuthorities.builder().addCertificateAuthority(genCA(data)).build(); | ||
} | ||
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private static CertPath genCertPath(FuzzedDataProvider data) throws CertificateException { | ||
List<Certificate> certList = new ArrayList<Certificate>(); | ||
CertificateFactory cf = CertificateFactory.getInstance("X.509"); | ||
certList.add( | ||
cf.generateCertificate(new ByteArrayInputStream(data.consumeBytes(MAX_CERT_SIZE)))); | ||
certList.add( | ||
cf.generateCertificate(new ByteArrayInputStream(data.consumeBytes(MAX_CERT_SIZE)))); | ||
return cf.generateCertPath(certList); | ||
} | ||
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private static CertificateAuthority genCA(FuzzedDataProvider data) throws CertificateException { | ||
return ImmutableCertificateAuthority.builder() | ||
.validFor(ImmutableValidFor.builder().start(Instant.EPOCH).build()) | ||
.subject(ImmutableSubject.builder().commonName("test").organization("test").build()) | ||
.certPath(genCertPath(data)) | ||
.uri(URI.create("test")) | ||
.build(); | ||
} | ||
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private static TransparencyLog genTlog(FuzzedDataProvider data) { | ||
var pk = | ||
ImmutablePublicKey.builder() | ||
.keyDetails("PKIX_ECDSA_P256_SHA_256") | ||
.rawBytes(data.consumeBytes(ECDSA_KEY_BYTES)) | ||
.validFor(ImmutableValidFor.builder().start(Instant.EPOCH).build()) | ||
.build(); | ||
var logId = Hashing.sha256().hashBytes(pk.getRawBytes()).asBytes(); | ||
return ImmutableTransparencyLog.builder() | ||
.baseUrl(URI.create("test")) | ||
.hashAlgorithm("SHA2_256") | ||
.publicKey(pk) | ||
.logId(ImmutableLogId.builder().keyId(logId).build()) | ||
.build(); | ||
} | ||
} |
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