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shrine-medco/commons/crypto/src/main/scala/net/shrine/crypto2/AbstractHubCertCollection.scala
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AbstractHubCertCollection.scala
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package net.shrine.crypto2
import java.security.Signature
import org.bouncycastle.cert.jcajce.JcaCertStore
import org.bouncycastle.cms.{CMSProcessableByteArray, CMSSignedData, CMSSignedDataGenerator}
import scala.util.Try
/**
* Created by ty on 11/7/16.
*/
abstract class AbstractHubCertCollection(override val myEntry: KeyStoreEntry, caEntry: KeyStoreEntry)
extends BouncyKeyStoreCollection {
override val allEntries: Iterable[KeyStoreEntry] = myEntry +: caEntry +: Nil
/**
*
* First, extract the X509Certificate from the signature.
* Second, verify that the certificate was signed by our CA
* Third, ensure that the attached X509Certificate actually signed the incoming
* signature and data
*/
override def verifyBytes(cmsEncodedSignature: Array[Byte], originalMessage: Array[Byte]) = {
val sigTry = Try(new CMSSignedData(cmsEncodedSignature))
if (sigTry.isFailure)
CryptoErrors.invalidSiganatureFormat(cmsEncodedSignature)
else {
val sig = sigTry.get.getSignedContent.getContent.asInstanceOf[Array[Byte]]
KeyStoreEntry.extractCertHolder(cmsEncodedSignature).exists(incomingCert => {
val signedByCa = KeyStoreEntry.certSignedOtherCert(caEntry.certificateHolder, incomingCert)
val x509Cert = KeyStoreEntry.extractX509Cert(incomingCert)
val signer = Signature.getInstance(
BouncyKeyStoreCollection.SHA256,
provider)
signer.initVerify(x509Cert.getPublicKey)
signer.update(originalMessage)
val correctSignature = signer.verify(sig)
signedByCa && correctSignature
})
}
}
/**
* First, sign the incoming bytes using the private key of our PrivateKeyEntry
* Then, encode the signature into CMSSignedData, and encode our X509Certificate into the signature
*
* Note, it's perfectly safe to encode our X509Certificate (it's basically our public key)
*/
override def signBytes(bytesToSign: Array[Byte]): Array[Byte] = {
import scala.collection.JavaConversions._
val data = new CMSProcessableByteArray(myEntry.sign(bytesToSign).getOrElse(CryptoErrors.noKeyError(myEntry)))
val gen = new CMSSignedDataGenerator()
gen.addCertificates(new JcaCertStore(Seq(myEntry.certificateHolder)))
gen.generate(data, true).getEncoded
}
}
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