How to verify XML signature in kotlin?

Question

I have the value of signature (extracted from the xml data), public key (extracted from a certificate), and the SignedInfo, which i have to canonicalize first. I've bee verifying it but returning an invalid signature, are there any other methods efficient for verifying xml signatures? here is my code:

fun verify(signature: String, breadcrumb: Breadcrumb): Boolean {
        return try {
            val canonicalizedSignedInfo = canonicalizeXml(signedInfo)
            val sha256RSA = Signature.getInstance("SHA256withRSA")
            val publicKey = getMcPubKey(breadcrumb)
            sha256RSA.initVerify(publicKey)
            sha256RSA.update(canonicalizedSignedInfo.toByteArray())

            sha256RSA.verify(java.util.Base64.getDecoder().decode(signature))
        } catch (e: Throwable) {
            e.printStackTrace()
            false
        }
    }



private fun canonicalizeXml(xmlString: String): String = ByteArrayOutputStream().let {
   Canonicalizer
     .getInstance(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS)
     .canonicalize(
        xmlString.toByteArray(Charsets.UTF_8),
        it,
        true
     )
   return it.toString(Charsets.UTF_8)
}