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feat(analyzer): More stable fingerprints #105

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Merged
Saloed merged 2 commits into from
Apr 23, 2026
Merged

feat(analyzer): More stable fingerprints #105

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a03b387
More stable fingerprints
Saloed Apr 23, 2026
8669d17
More stable fingerprints
Saloed Apr 23, 2026
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4 changes: 4 additions & 0 deletions core/build.gradle.kts
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,10 @@ tasks.withType<Test> {
}
}

tasks.withType<JavaCompile> {
sourceCompatibility = JavaVersion.VERSION_17.toString()
}

val projectAnalyzerJar = tasks.register<ShadowJar>("projectAnalyzerJar") {
jarWithDependencies("opentaint-project-analyzer", "org.opentaint.jvm.sast.runner.ProjectAnalyzerRunner")
}
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32 changes: 21 additions & 11 deletions core/src/main/kotlin/org/opentaint/jvm/sast/sarif/SarifGenerator.kt
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Expand Up @@ -33,6 +33,7 @@ import org.opentaint.semgrep.pattern.RuleMetadata
import java.io.OutputStream
import java.nio.file.Path
import java.security.MessageDigest
import java.util.Arrays
import kotlin.io.encoding.Base64
import kotlin.io.encoding.ExperimentalEncodingApi
import kotlin.io.path.absolutePathString
Expand Down Expand Up @@ -169,21 +170,30 @@ class SarifGenerator(
val digest = MessageDigest.getInstance("SHA-256")
digest.update(ruleId.toByteArray())
digest.addLocationFingerprint(vulnerabilityLocation)
traces?.forEach { trace ->
when (kind) {
FingerprintKind.FULL_TRACE -> {
trace.forEach { digest.addLocationFingerprint(it) }
}

FingerprintKind.SOURCE_SINK -> {
trace.firstOrNull()?.let { digest.addLocationFingerprint(it) }
}
}
}

traces
?.map { computeTraceFingerprint(it, kind) }
?.sortedWith(Arrays::compare)
?.forEach(digest::update)

val digestData = digest.digest()
return Base64.encode(digestData)
}

private fun computeTraceFingerprint(
trace: List<IntermediateLocation>,
kind: FingerprintKind,
): ByteArray {
val digest = MessageDigest.getInstance("SHA-256")

when (kind) {
FingerprintKind.SOURCE_SINK -> trace.firstOrNull()?.let { digest.addLocationFingerprint(it) }
FingerprintKind.FULL_TRACE -> trace.forEach { digest.addLocationFingerprint(it) }
}

return digest.digest()
}

private fun MessageDigest.addLocationFingerprint(loc: IntermediateLocation) {
val instLoc = loc.inst.location as? JIRInstLocation ?: return
update(instLoc.method.enclosingClass.name.toByteArray())
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