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SigningAndVerifyingContentWithKMS.kt
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SigningAndVerifyingContentWithKMS.kt
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package smoke
import assertions.JwtAssertions.algorithmEqualTo
import assertions.JwtAssertions.hasValidSignature
import assertions.JwtAssertions.signaturePayload
import com.amazonaws.services.kms.AWSKMSClientBuilder
import com.amazonaws.services.kms.model.GetPublicKeyRequest
import org.jose4j.jws.JsonWebSignature
import org.junit.jupiter.api.Test
import strikt.api.expectThat
import strikt.assertions.isEqualTo
import uk.nhs.nhsx.core.aws.kms.KmsSigner
import uk.nhs.nhsx.core.aws.ssm.AwsSsmParameters
import uk.nhs.nhsx.core.aws.ssm.ParameterKeyLookup
import uk.nhs.nhsx.core.aws.ssm.ParameterName
import uk.nhs.nhsx.core.aws.xray.Tracing
import uk.nhs.nhsx.keyfederation.upload.JWS
import java.security.KeyFactory
import java.security.spec.X509EncodedKeySpec
class SigningAndVerifyingContentWithKMS {
@Test
fun `signing and verifying some content with kms`() {
Tracing.disableXRayComplaintsForMainClasses()
// generate key using KmsSignature
val parameterKeyLookup = ParameterKeyLookup(AwsSsmParameters(), ParameterName.of("/app/kms/SigningKeyArn"))
val payload = """{ "key": 1234 }"""
val kmsClient = AWSKMSClientBuilder.defaultClient()
val generated = JWS(KmsSigner(parameterKeyLookup::kmsKeyId, kmsClient)).sign(payload)
// get corresponding public key from kms and create java key from it
val publicKey = kmsClient
.getPublicKey(
GetPublicKeyRequest()
.withKeyId(parameterKeyLookup.kmsKeyId().value)
).publicKey
val kmsPublicKey = KeyFactory.getInstance("EC").let {
it.generatePublic(
X509EncodedKeySpec(
ByteArray(publicKey.remaining()).also { b ->
publicKey.get(b)
}
)
)
}
// verify the signature
val jws = JsonWebSignature().also {
it.key = kmsPublicKey
it.compactSerialization = generated
}
expectThat(jws) {
algorithmEqualTo("ES256")
hasValidSignature()
signaturePayload.isEqualTo(payload)
}
}
}