diff --git a/xmldsig/xmldsig_test.go b/xmldsig/xmldsig_test.go
index 3ab0365..79e270a 100644
--- a/xmldsig/xmldsig_test.go
+++ b/xmldsig/xmldsig_test.go
@@ -210,3 +210,43 @@ vCfqu9yXDYKVOBI57F0Efg==</SignatureValue>
 		return
 	}
 }
+
+func TestVerifySAMLSignature(t *testing.T) {
+	cert := []byte(`-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----`)
+	doc := []byte("<saml2:Assertion xmlns:saml2=\"urn:oasis:names:tc:SAML:2.0:assertion\" xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" ID=\"_f6f518e2c236c9c558f7a8bc6387b103\" IssueInstant=\"2015-11-29T21:29:09.991Z\" Version=\"2.0\"><saml2:Issuer Format=\"urn:oasis:names:tc:SAML:2.0:nameid-format:entity\">https://idp.testshib.org/idp/shibboleth</saml2:Issuer><ds:Signature xmlns:ds=\"http://www.w3.org/2000/09/xmldsig#\"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm=\"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256\"></ds:SignatureMethod><ds:Reference URI=\"#_f6f518e2c236c9c558f7a8bc6387b103\"><ds:Transforms><ds:Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"></ds:Transform><ds:Transform Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"><ec:InclusiveNamespaces xmlns:ec=\"http://www.w3.org/2001/10/xml-exc-c14n#\" PrefixList=\"xs\"></ec:InclusiveNamespaces></ds:Transform></ds:Transforms><ds:DigestMethod Algorithm=\"http://www.w3.org/2001/04/xmlenc#sha256\"></ds:DigestMethod><ds:DigestValue>VwEKsGObmOM6y22Nstadwz1fq6dnQ2aDmERPMuEteds=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>gcROTzJ7HgTu/LQprki8v9J5y4et2np48hYspgmygZRvRawzxfQDgB0MBvDIBG78J5XSd401g7E999JUEh4JtSMAig1THbeWhyITGHU1Vpl2xAR5Ma0vCMLjVIleeuFHhStFBNqKirNfulfhEa7Q5THVGKrVsNuIaP/yc10Gf8AyHfCIOf/ZQGiU3Srp/pKZLXPkSKTEZIq5tAOl+pA0maFBvb4+EkMPB6E66HiXknHL9KdNh8bPcq+EkqjhtHWOy341F8W9iy6MJYGuO9ksxdiY6FK5SqmPHlgoJqXx7Et2vYME6opIgFYB6m1KW6kWgVcF0VyIzJbkXq3yTi0b5g==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIEDjCCAvagAwIBAgIBADANBgkqhkiG9w0BAQUFADBnMQswCQYDVQQGEwJVUzEVMBMGA1UECBMM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\nj8Bbnl+ev0peYzxFyF5sQA==</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject><saml2:NameID Format=\"urn:oasis:names:tc:SAML:2.0:nameid-format:transient\" NameQualifier=\"https://idp.testshib.org/idp/shibboleth\" SPNameQualifier=\"https://15661444.ngrok.io/saml2/metadata\">_5c425656721b41a6cfa4a9c96225e082</saml2:NameID><saml2:SubjectConfirmation Method=\"urn:oasis:names:tc:SAML:2.0:cm:bearer\"><saml2:SubjectConfirmationData Address=\"75.144.86.91\" InResponseTo=\"id-3d21faf29a101222d740735fa512f161\" NotOnOrAfter=\"2015-11-29T21:34:09.991Z\" Recipient=\"https://15661444.ngrok.io/saml2/acs\"></saml2:SubjectConfirmationData></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore=\"2015-11-29T21:29:09.991Z\" NotOnOrAfter=\"2015-11-29T21:34:09.991Z\"><saml2:AudienceRestriction><saml2:Audience>https://15661444.ngrok.io/saml2/metadata</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant=\"2015-11-29T21:29:09.715Z\" SessionIndex=\"_57adf921604642bd4e1dce7f308734f0\"><saml2:SubjectLocality Address=\"75.144.86.91\"></saml2:SubjectLocality><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement><saml2:AttributeStatement><saml2:Attribute FriendlyName=\"uid\" Name=\"urn:oid:0.9.2342.19200300.100.1.1\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">myself</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"eduPersonAffiliation\" Name=\"urn:oid:1.3.6.1.4.1.5923.1.1.1.1\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Member</saml2:AttributeValue><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Staff</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"eduPersonPrincipalName\" Name=\"urn:oid:1.3.6.1.4.1.5923.1.1.1.6\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">myself@testshib.org</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"sn\" Name=\"urn:oid:2.5.4.4\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">And I</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"eduPersonScopedAffiliation\" Name=\"urn:oid:1.3.6.1.4.1.5923.1.1.1.9\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Member@testshib.org</saml2:AttributeValue><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Staff@testshib.org</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"givenName\" Name=\"urn:oid:2.5.4.42\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Me Myself</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"eduPersonEntitlement\" Name=\"urn:oid:1.3.6.1.4.1.5923.1.1.1.7\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">urn:mace:dir:entitlement:common-lib-terms</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"cn\" Name=\"urn:oid:2.5.4.3\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">Me Myself And I</saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"eduPersonTargetedID\" Name=\"urn:oid:1.3.6.1.4.1.5923.1.1.1.10\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue><saml2:NameID Format=\"urn:oasis:names:tc:SAML:2.0:nameid-format:persistent\" NameQualifier=\"https://idp.testshib.org/idp/shibboleth\" SPNameQualifier=\"https://15661444.ngrok.io/saml2/metadata\">8F+M9ovyaYNwCId0pVkVsnZYRDo=</saml2:NameID></saml2:AttributeValue></saml2:Attribute><saml2:Attribute FriendlyName=\"telephoneNumber\" Name=\"urn:oid:2.5.4.20\" NameFormat=\"urn:oasis:names:tc:SAML:2.0:attrname-format:uri\"><saml2:AttributeValue xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:type=\"xs:string\">555-5555</saml2:AttributeValue></saml2:Attribute></saml2:AttributeStatement></saml2:Assertion>")
+
+	if err := Verify(cert, doc, Options{
+		XMLID: []XMLIDOption{{
+			ElementName:      "Assertion",
+			ElementNamespace: "urn:oasis:names:tc:SAML:2.0:assertion",
+			AttributeName:    "ID",
+		}},
+	}); err != nil {
+		t.Errorf("verify: %s", err)
+		return
+	}
+
+}