Refactor and simplify ABS verification API

attributes.go

@@ -8,8 +8,6 @@ import (
 	"math/big"
 	"time"
 
-	"fmt"
-
 	"github.com/go-errors/errors"
 	"github.com/mhe/gabi"
 )
@@ -20,24 +18,6 @@ const (
 	metadataLength = 1 + 3 + 2 + 2 + 16
 )
 
-type AttributeResult struct {
-	AttributeValue       TranslatedString        `json:"value"` // Value of the disclosed attribute
-	AttributeId          AttributeTypeIdentifier `json:"id"`
-	AttributeProofStatus AttributeProofStatus    `json:"status"`
-}
-
-type AttributeResultList []*AttributeResult
-
-// AttributeProofStatus is the proof status of a single attribute
-type AttributeProofStatus string
-
-const (
-	AttributeProofStatusPresent      = AttributeProofStatus("PRESENT")       // Attribute is disclosed and matches the value
-	AttributeProofStatusExtra        = AttributeProofStatus("EXTRA")         // Attribute is disclosed, but wasn't requested in request
-	AttributeProofStatusMissing      = AttributeProofStatus("MISSING")       // Attribute is NOT disclosed, but should be according to request
-	AttributeProofStatusInvalidValue = AttributeProofStatus("INVALID_VALUE") // Attribute is disclosed, but has invalid value according to request
-)
-
 var (
 	versionField     = metadataField{1, 0}
 	signingDateField = metadataField{3, 1}
@@ -357,68 +337,50 @@ type AttributeDisjunction struct {
 	Values     map[AttributeTypeIdentifier]*string
 
 	selected *AttributeTypeIdentifier
-}
-
-// AttributeDisjunction with the disclosed value that is used to satisfy the disjunction
-type DisclosedAttributeDisjunction struct {
-	AttributeDisjunction
-
-	DisclosedValue TranslatedString
-	DisclosedId    AttributeTypeIdentifier
-	ProofStatus    AttributeProofStatus
+	value    *string
+	index    *int
 }
 
 // An AttributeDisjunctionList is a list of AttributeDisjunctions.
 type AttributeDisjunctionList []*AttributeDisjunction
 
-// Convert disjunction to a DisclosedAttributeDisjunction that contains disclosed attribute+value
-func (disjunction *AttributeDisjunction) ToDisclosedAttributeDisjunction(ar *AttributeResult) *DisclosedAttributeDisjunction {
-	return &DisclosedAttributeDisjunction{
-		AttributeDisjunction: *disjunction,
-		DisclosedValue:       ar.AttributeValue,
-		DisclosedId:          ar.AttributeId,
-		ProofStatus:          ar.AttributeProofStatus,
-	}
-}
-
 // HasValues indicates if the attributes of this disjunction have values
 // that should be satisfied.
 func (disjunction *AttributeDisjunction) HasValues() bool {
 	return disjunction.Values != nil && len(disjunction.Values) != 0
 }
 
-// Satisfied indicates if this disjunction has a valid chosen attribute
-// to be disclosed.
-func (disjunction *AttributeDisjunction) Satisfied() bool {
-	if disjunction.selected == nil {
-		return false
-	}
-	for _, attr := range disjunction.Attributes {
-		if *disjunction.selected == attr {
-			return true
+// attemptSatisfy tries to match the specified attribute type and value against the current disjunction,
+// returning true if the disjunction contains the specified attribute type. Note that if the disjunction
+// has required values, then it is only considered satisfied by the specified attribute type and value
+// if the required value matches the specified value.
+func (disjunction *AttributeDisjunction) attemptSatisfy(id AttributeTypeIdentifier, value *string) bool {
+	var found bool
+	for index, attr := range disjunction.Attributes {
+		if attr == id {
+			found = true
+			disjunction.selected = &id
+			disjunction.index = &index
+			disjunction.value = value
+			if !disjunction.HasValues() || disjunction.Values[id] == value {
+				return true
+			}
 		}
 	}
-	return false
+	return found
 }
 
-// Check whether specified attributedisjunction satisfy a list of disclosed attributes
-// We return true if one of the attributes in the disjunction is satisfied
-func (disjunction *AttributeDisjunction) SatisfyDisclosed(disclosed DisclosedCredentialList, conf *Configuration) (bool, *DisclosedAttributeDisjunction) {
-	var attributeResult *AttributeResult
-	for _, attr := range disjunction.Attributes {
-		requestedValue := disjunction.Values[attr]
-
-		var isSatisfied bool
-		isSatisfied, attributeResult = disclosed.isAttributeSatisfied(attr, requestedValue)
-
-		if isSatisfied {
-			return true, disjunction.ToDisclosedAttributeDisjunction(attributeResult)
-		}
+// satisfied indicates if this disjunction has a valid attribute type and value selected,
+// matching one of the attributes in the disjunction and possibly also the corresponding required value.
+func (disjunction *AttributeDisjunction) satisfied() bool {
+	if disjunction.index == nil {
+		return false
 	}
 
-	// Nothing satisfied, attributeResult will contain the last attribute of the original request
-	// TODO: do we want this?
-	return false, disjunction.ToDisclosedAttributeDisjunction(attributeResult)
+	attr := disjunction.Attributes[*disjunction.index]
+	return !disjunction.HasValues() || disjunction.value == disjunction.Values[attr]
+
+	return false
 }
 
 // MatchesConfig returns true if all attributes contained in the disjunction are
@@ -436,10 +398,10 @@ func (disjunction *AttributeDisjunction) MatchesConfig(conf *Configuration) bool
 	return true
 }
 
-// Satisfied indicates whether each contained attribute disjunction has a chosen attribute.
-func (dl AttributeDisjunctionList) Satisfied() bool {
+// satisfied indicates whether each contained attribute disjunction has a chosen attribute.
+func (dl AttributeDisjunctionList) satisfied() bool {
 	for _, disjunction := range dl {
-		if !disjunction.Satisfied() {
+		if !disjunction.satisfied() {
 			return false
 		}
 	}
@@ -481,27 +443,6 @@ func (disjunction *AttributeDisjunction) MarshalJSON() ([]byte, error) {
 	return json.Marshal(temp)
 }
 
-// Since we have a custom MarshalJSON for AttributeDisjunction, we also need one for every struct that extends AttributeDisjunction...
-func (disclosedAttributeDisjunction *DisclosedAttributeDisjunction) MarshalJSON() ([]byte, error) {
-	temp := struct {
-		Label      string                    `json:"label"`
-		Attributes []AttributeTypeIdentifier `json:"attributes"`
-
-		DisclosedValue TranslatedString        `json:"disclosedValue"`
-		DisclosedId    AttributeTypeIdentifier `json:"disclosedId"`
-		ProofStatus    AttributeProofStatus    `json:"proofStatus"`
-	}{
-		Label:      disclosedAttributeDisjunction.Label,
-		Attributes: disclosedAttributeDisjunction.Attributes,
-
-		DisclosedValue: disclosedAttributeDisjunction.DisclosedValue,
-		DisclosedId:    disclosedAttributeDisjunction.DisclosedId,
-		ProofStatus:    disclosedAttributeDisjunction.ProofStatus,
-	}
-
-	return json.Marshal(temp)
-}
-
 // UnmarshalJSON unmarshals an attribute disjunction from JSON.
 func (disjunction *AttributeDisjunction) UnmarshalJSON(bytes []byte) error {
 	if disjunction.Values == nil {
@@ -554,19 +495,3 @@ func (disjunction *AttributeDisjunction) UnmarshalJSON(bytes []byte) error {
 
 	return nil
 }
-
-func (al *AttributeResultList) String() string {
-	// TODO: pretty print?
-	str := "Attribute --- Value --- ProofStatus:"
-	for _, v := range *al {
-		str = str + "\n" + v.String()
-	}
-	return str
-}
-
-func (ar *AttributeResult) String() string {
-	return fmt.Sprintf("%v --- %v --- %v",
-		ar.AttributeId,
-		ar.AttributeValue,
-		ar.AttributeProofStatus)
-}

irmaclient/irmaclient_test.go

@@ -172,11 +172,11 @@ func TestLogging(t *testing.T) {
 	sig, err := entry.GetSignedMessage()
 	require.NoError(t, err)
 	require.NotNil(t, sig)
-	status, list := sig.VerifyWithoutRequest(client.Configuration)
-	require.Equal(t, irma.ProofStatusValid, status)
-	require.NotEmpty(t, list)
-	require.Contains(t, list[0].Attributes, attrid)
-	require.Equal(t, "s1234567", list[0].Attributes[attrid]["en"])
+	result := sig.Verify(client.Configuration, nil)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
+	require.NotEmpty(t, result.Attributes)
+	require.Equal(t, result.Attributes[0].Identifier, attrid)
+	require.Equal(t, "s1234567", result.Attributes[0].Value["en"])
 
 	test.ClearTestStorage(t)
 }

irmaclient/manual_session_test.go

@@ -22,7 +22,7 @@ func createManualSessionHandler(t *testing.T, client *Client) *ManualTestHandler
 	}
 }
 
-func manualSessionHelper(t *testing.T, client *Client, h *ManualTestHandler, request string, verifyAs string, corrupt bool) *irma.SignatureProofResult {
+func manualSessionHelper(t *testing.T, client *Client, h *ManualTestHandler, request string, verifyAs string, corrupt bool) *irma.VerificationResult {
 	init := client == nil
 	if init {
 		client = parseStorage(t)
@@ -35,9 +35,13 @@ func manualSessionHelper(t *testing.T, client *Client, h *ManualTestHandler, req
 		require.NoError(t, result.Err)
 	}
 
-	verifyasRequest := &irma.SignatureRequest{}
-	err := json.Unmarshal([]byte(verifyAs), verifyasRequest)
-	require.NoError(t, err)
+	var verifyasRequest *irma.SignatureRequest
+	if verifyAs != "" {
+		verifyasRequest = &irma.SignatureRequest{}
+		err := json.Unmarshal([]byte(verifyAs), verifyasRequest)
+		require.NoError(t, err)
+	}
+
 	if corrupt {
 		// Interesting: modifying C results in INVALID_CRYPTO; modifying A or an attribute results in INVALID_TIMESTAMP
 		i := result.Result.Signature[0].(*gabi.ProofD).C
@@ -49,10 +53,14 @@ func manualSessionHelper(t *testing.T, client *Client, h *ManualTestHandler, req
 func TestManualSession(t *testing.T) {
 	request := "{\"nonce\": 42, \"context\": 1337, \"type\": \"signing\", \"message\":\"I owe you everything\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"irma-demo.RU.studentCard.studentID\"]}]}"
 	ms := createManualSessionHandler(t, nil)
+
 	result := manualSessionHelper(t, nil, ms, request, request, false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
+	require.Equal(t, irma.AttributeProofStatusPresent, result.Attributes[0].Status)
 
-	require.Equal(t, irma.ProofStatusValid, result.ProofStatus)
-	require.Equal(t, irma.AttributeProofStatusPresent, result.ToAttributeResultList()[0].AttributeProofStatus)
+	result = manualSessionHelper(t, nil, ms, request, "", false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
+	require.Equal(t, irma.AttributeProofStatusExtra, result.Attributes[0].Status)
 
 	test.ClearTestStorage(t)
 }
@@ -64,7 +72,7 @@ func TestManualSessionInvalidNonce(t *testing.T) {
 	ms := createManualSessionHandler(t, nil)
 	result := manualSessionHelper(t, nil, ms, request, invalidRequest, false)
 
-	require.Equal(t, irma.ProofStatusUnmatchedRequest, result.ProofStatus)
+	require.Equal(t, irma.ProofStatusUnmatchedRequest, result.Status)
 
 	test.ClearTestStorage(t)
 }
@@ -75,13 +83,12 @@ func TestManualSessionInvalidRequest(t *testing.T) {
 	invalidRequest := "{\"nonce\": 0, \"context\": 0, \"type\": \"signing\", \"message\":\"I owe you everything\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"irma-demo.RU.studentCard.university\"]}]}"
 	ms := createManualSessionHandler(t, nil)
 	result := manualSessionHelper(t, nil, ms, request, invalidRequest, false)
-	list := result.ToAttributeResultList()
 
-	require.Equal(t, irma.ProofStatusMissingAttributes, result.ProofStatus)
+	require.Equal(t, irma.ProofStatusMissingAttributes, result.Status)
 	// First attribute result is MISSING, because it is in the request but not disclosed
-	require.Equal(t, irma.AttributeProofStatusMissing, list[0].AttributeProofStatus)
+	require.Equal(t, irma.AttributeProofStatusMissing, result.Attributes[0].Status)
 	// Second attribute result is EXTRA, since it is disclosed, but not matching the sigrequest
-	require.Equal(t, irma.AttributeProofStatusExtra, list[1].AttributeProofStatus)
+	require.Equal(t, irma.AttributeProofStatusExtra, result.Attributes[1].Status)
 
 	test.ClearTestStorage(t)
 }
@@ -93,8 +100,8 @@ func TestManualSessionInvalidAttributeValue(t *testing.T) {
 	ms := createManualSessionHandler(t, nil)
 	result := manualSessionHelper(t, nil, ms, request, invalidRequest, false)
 
-	require.Equal(t, irma.ProofStatusMissingAttributes, result.ProofStatus)
-	require.Equal(t, irma.AttributeProofStatusInvalidValue, result.ToAttributeResultList()[0].AttributeProofStatus)
+	require.Equal(t, irma.ProofStatusMissingAttributes, result.Status)
+	require.Equal(t, irma.AttributeProofStatusInvalidValue, result.Attributes[0].Status)
 
 	test.ClearTestStorage(t)
 }
@@ -102,9 +109,12 @@ func TestManualSessionInvalidAttributeValue(t *testing.T) {
 func TestManualKeyShareSession(t *testing.T) {
 	request := "{\"nonce\": 0, \"context\": 0, \"type\": \"signing\", \"message\":\"I owe you everything\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"test.test.mijnirma.email\"]}]}"
 	ms := createManualSessionHandler(t, nil)
+
 	result := manualSessionHelper(t, nil, ms, request, request, false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
 
-	require.Equal(t, irma.ProofStatusValid, result.ProofStatus)
+	result = manualSessionHelper(t, nil, ms, request, "", false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
 
 	test.ClearTestStorage(t)
 }
@@ -120,12 +130,16 @@ func TestManualSessionMultiProof(t *testing.T) {
 	request := "{\"nonce\": 0, \"context\": 0, \"type\": \"signing\", \"message\":\"I owe you everything\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"irma-demo.RU.studentCard.studentID\"]},{\"label\":\"BSN\",\"attributes\":[\"irma-demo.MijnOverheid.root.BSN\"]}]}"
 
 	ms := createManualSessionHandler(t, client)
+
 	result := manualSessionHelper(t, client, ms, request, request, false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
+	require.Equal(t, irma.AttributeProofStatusPresent, result.Attributes[0].Status)
+	require.Equal(t, irma.AttributeProofStatusPresent, result.Attributes[1].Status)
 
-	require.Equal(t, irma.ProofStatusValid, result.ProofStatus)
-	list := result.ToAttributeResultList()
-	require.Equal(t, irma.AttributeProofStatusPresent, list[0].AttributeProofStatus)
-	require.Equal(t, irma.AttributeProofStatusPresent, list[1].AttributeProofStatus)
+	result = manualSessionHelper(t, client, ms, request, "", false)
+	require.Equal(t, irma.ProofStatusValid, result.Status)
+	require.Equal(t, irma.AttributeProofStatusExtra, result.Attributes[0].Status)
+	require.Equal(t, irma.AttributeProofStatusExtra, result.Attributes[1].Status)
 
 	test.ClearTestStorage(t)
 }
@@ -135,7 +149,9 @@ func TestManualSessionInvalidProof(t *testing.T) {
 	ms := createManualSessionHandler(t, nil)
 	result := manualSessionHelper(t, nil, ms, request, request, true)
 
-	require.Equal(t, irma.ProofStatusInvalidCrypto, result.ProofStatus)
+	require.Equal(t, irma.ProofStatusInvalidCrypto, result.Status)
 
 	test.ClearTestStorage(t)
 }
+
+// TODO test verification without request (also with multiproof)

irmago_test.go

@@ -193,9 +193,11 @@ func TestAttributeDisjunctionMarshaling(t *testing.T) {
 
 	require.True(t, disjunction.MatchesConfig(conf))
 
-	require.False(t, disjunction.Satisfied())
+	require.False(t, disjunction.satisfied())
+	index := 0
 	disjunction.selected = &disjunction.Attributes[0]
-	require.True(t, disjunction.Satisfied())
+	disjunction.index = &index
+	require.True(t, disjunction.satisfied())
 }
 
 func TestMetadataAttribute(t *testing.T) {
@@ -288,12 +290,11 @@ func TestVerifyValidSig(t *testing.T) {
 	require.Equal(t, sigRequest.Context, big.NewInt(1337))
 
 	// Test if we can verify it with the original request
-	sigProofResult := irmaSignedMessage.Verify(conf, sigRequest)
-	require.Equal(t, sigProofResult.ProofStatus, ProofStatusValid)
-	attributeList := sigProofResult.ToAttributeResultList()
-	require.Len(t, attributeList, 1)
-	require.Equal(t, attributeList[0].AttributeProofStatus, AttributeProofStatusPresent)
-	require.Equal(t, attributeList[0].AttributeValue["en"], "456")
+	verificationResult := irmaSignedMessage.Verify(conf, sigRequest)
+	require.Equal(t, verificationResult.Status, ProofStatusValid)
+	require.Len(t, verificationResult.Attributes, 1)
+	require.Equal(t, verificationResult.Attributes[0].Status, AttributeProofStatusPresent)
+	require.Equal(t, verificationResult.Attributes[0].Value["en"], "456")
 
 	// Test if we can verify it with a request that contains strings instead of ints for nonce and context
 	stringRequest := "{\"nonce\": \"42\", \"context\": \"1337\", \"message\":\"I owe you everything\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"irma-demo.RU.studentCard.studentID\"]}]}"
@@ -305,12 +306,11 @@ func TestVerifyValidSig(t *testing.T) {
 	require.Equal(t, stringSigRequest.Context, big.NewInt(1337))
 
 	// Test if we can verify it with the original request
-	stringSigProofResult := irmaSignedMessage.Verify(conf, sigRequest)
-	require.Equal(t, stringSigProofResult.ProofStatus, ProofStatusValid)
-	stringAttributeList := sigProofResult.ToAttributeResultList()
-	require.Len(t, stringAttributeList, 1)
-	require.Equal(t, stringAttributeList[0].AttributeProofStatus, AttributeProofStatusPresent)
-	require.Equal(t, stringAttributeList[0].AttributeValue["en"], "456")
+	verificationResult = irmaSignedMessage.Verify(conf, sigRequest)
+	require.Equal(t, verificationResult.Status, ProofStatusValid)
+	require.Len(t, verificationResult.Attributes, 1)
+	require.Equal(t, verificationResult.Attributes[0].Status, AttributeProofStatusPresent)
+	require.Equal(t, verificationResult.Attributes[0].Value["en"], "456")
 
 	// Test verify against unmatched request (i.e. different nonce, context or message)
 	unmatched := "{\"nonce\": 42, \"context\": 1337, \"message\":\"I owe you NOTHING\",\"content\":[{\"label\":\"Student number (RU)\",\"attributes\":[\"irma-demo.RU.studentCard.studentID\"]}]}"
@@ -318,13 +318,13 @@ func TestVerifyValidSig(t *testing.T) {
 	unmatchedSigRequest := &SignatureRequest{}
 	json.Unmarshal(unmatchedSigRequestJSON, unmatchedSigRequest)
 	unmatchedResult := irmaSignedMessage.Verify(conf, unmatchedSigRequest)
-	require.Equal(t, unmatchedResult.ProofStatus, ProofStatusUnmatchedRequest)
+	require.Equal(t, unmatchedResult.Status, ProofStatusUnmatchedRequest)
 
 	// Test if we can also verify it without using the original request
-	proofStatus, disclosed := irmaSignedMessage.VerifyWithoutRequest(conf)
-	require.Equal(t, proofStatus, ProofStatusValid)
-	require.Len(t, disclosed, 1)
-	require.Equal(t, disclosed[0].Attributes[NewAttributeTypeIdentifier("irma-demo.RU.studentCard.studentID")]["en"], "456")
+	verificationResult = irmaSignedMessage.Verify(conf, nil)
+	require.Equal(t, verificationResult.Status, ProofStatusValid)
+	require.Len(t, verificationResult.Attributes, 1)
+	require.Equal(t, verificationResult.Attributes[0].Value["en"], "456")
 }
 
 func TestVerifyInValidSig(t *testing.T) {
@@ -341,11 +341,10 @@ func TestVerifyInValidSig(t *testing.T) {
 	json.Unmarshal(sigRequestJSON, sigRequest)
 
 	sigProofResult := irmaSignedMessage.Verify(conf, sigRequest)
-	require.Equal(t, sigProofResult.ProofStatus, ProofStatusInvalidCrypto)
+	require.Equal(t, sigProofResult.Status, ProofStatusInvalidCrypto)
 
-	proofStatus, disclosed := irmaSignedMessage.VerifyWithoutRequest(conf)
-	require.Equal(t, proofStatus, ProofStatusInvalidCrypto)
-	require.Nil(t, disclosed)
+	verificationResult := irmaSignedMessage.Verify(conf, nil)
+	require.Equal(t, verificationResult.Status, ProofStatusInvalidCrypto)
 }
 
 func TestVerifyInValidNonce(t *testing.T) {
@@ -363,11 +362,10 @@ func TestVerifyInValidNonce(t *testing.T) {
 	json.Unmarshal(sigRequestJSON, sigRequest)
 
 	sigProofResult := irmaSignedMessage.Verify(conf, sigRequest)
-	require.Equal(t, sigProofResult.ProofStatus, ProofStatusInvalidCrypto)
+	require.Equal(t, sigProofResult.Status, ProofStatusInvalidCrypto)
 
-	proofStatus, disclosed := irmaSignedMessage.VerifyWithoutRequest(conf)
-	require.Equal(t, proofStatus, ProofStatusInvalidCrypto)
-	require.Nil(t, disclosed)
+	verificationResult := irmaSignedMessage.Verify(conf, nil)
+	require.Equal(t, verificationResult.Status, ProofStatusInvalidCrypto)
 }
 
 // Test attribute decoding with both old and new metadata versions

verify.go

 package irma
 
 import (
-	"fmt"
 	"math/big"
 	"time"
 
@@ -12,6 +11,9 @@ import (
 // ProofStatus is the status of the complete proof
 type ProofStatus string
 
+// Status is the proof status of a single attribute
+type AttributeProofStatus string
+
 const (
 	ProofStatusValid             = ProofStatus("VALID")
 	ProofStatusInvalidCrypto     = ProofStatus("INVALID_CRYPTO")
@@ -22,18 +24,12 @@ const (
 	// The contained attributes are currently expired, but it is not certain if they already were expired
 	// during creation of the ABS.
 	ProofStatusExpired = ProofStatus("EXPIRED")
-)
-
-// ProofResult is a result of a complete proof, containing all the disclosed attributes and corresponding request
-type ProofResult struct {
-	Disjunctions []*DisclosedAttributeDisjunction `json:"disjunctions"`
-	ProofStatus  ProofStatus
-}
 
-type SignatureProofResult struct {
-	*ProofResult
-	Message string `json:"message"`
-}
+	AttributeProofStatusPresent      = AttributeProofStatus("PRESENT")       // Attribute is disclosed and matches the value
+	AttributeProofStatusExtra        = AttributeProofStatus("EXTRA")         // Attribute is disclosed, but wasn't requested in request
+	AttributeProofStatusMissing      = AttributeProofStatus("MISSING")       // Attribute is NOT disclosed, but should be according to request
+	AttributeProofStatusInvalidValue = AttributeProofStatus("INVALID_VALUE") // Attribute is disclosed, but has invalid value according to request
+)
 
 // DisclosedCredential contains raw disclosed credentials, without any extra parsing information
 type DisclosedCredential struct {
@@ -44,68 +40,17 @@ type DisclosedCredential struct {
 
 type DisclosedCredentialList []*DisclosedCredential
 
-// Helper function to check if an attribute is satisfied against a list of disclosed attributes
-// This is the case if:
-// attribute is contained in disclosed AND if a value is present: equal to that value
-// al can be nil if you don't want to include attribute status for proof
-func (disclosed DisclosedCredentialList) isAttributeSatisfied(attributeId AttributeTypeIdentifier, requestedValue *string) (bool, *AttributeResult) {
-	ar := AttributeResult{
-		AttributeId: attributeId,
-	}
-
-	for _, cred := range disclosed {
-		disclosedAttributeValue := cred.Attributes[attributeId]
-
-		// Continue to next credential if requested attribute isn't disclosed in this credential
-		if disclosedAttributeValue == nil || len(disclosedAttributeValue) == 0 {
-			continue
-		}
-
-		// If this is the disclosed attribute, check if value matches
-		// Attribute is satisfied if:
-		// - Attribute is disclosed (i.e. not nil)
-		// - Value is empty OR value equal to disclosedValue
-		ar.AttributeValue = disclosedAttributeValue
-
-		if requestedValue == nil || *cred.rawAttributes[attributeId] == *requestedValue {
-			ar.AttributeProofStatus = AttributeProofStatusPresent
-			return true, &ar
-		} else {
-			// If attribute is disclosed and present, but not equal to required value, mark it as invalid_value
-			// We won't return true and continue searching in other disclosed attributes
-			ar.AttributeProofStatus = AttributeProofStatusInvalidValue
-		}
-	}
-
-	// If there is never a value assigned, then this attribute isn't disclosed, and thus missing
-	if len(ar.AttributeValue) == 0 {
-		ar.AttributeProofStatus = AttributeProofStatusMissing
-	}
-	return false, &ar
+// VerificationResult is a result of verification of a SignedMessage or disclosure proof, containing all the disclosed attributes
+type VerificationResult struct {
+	Attributes []*DisclosedAttribute
+	Status     ProofStatus
 }
 
-// Create a signature proof result and check disclosed credentials against a signature request
-func (disclosed DisclosedCredentialList) createAndCheckSignatureProofResult(configuration *Configuration, sigRequest *SignatureRequest) *SignatureProofResult {
-	signatureProofResult := SignatureProofResult{
-		ProofResult: &ProofResult{},
-		Message:     sigRequest.Message,
-	}
-	for _, content := range sigRequest.Content {
-		isSatisfied, disjunction := content.SatisfyDisclosed(disclosed, configuration)
-		signatureProofResult.Disjunctions = append(signatureProofResult.Disjunctions, disjunction)
-
-		// If satisfied, continue to next one
-		if isSatisfied {
-			continue
-		}
-
-		// Else, set proof status to missing_attributes, but check other as well to add other disjunctions to result
-		// (so user also knows attribute status of other disjunctions)
-		signatureProofResult.ProofStatus = ProofStatusMissingAttributes
-	}
-
-	signatureProofResult.Disjunctions = addExtraAttributes(disclosed, signatureProofResult.ProofResult)
-	return &signatureProofResult
+// DisclosedAttribute represents a disclosed attribute.
+type DisclosedAttribute struct {
+	Value      TranslatedString        `json:"value"` // Value of the disclosed attribute
+	Identifier AttributeTypeIdentifier `json:"id"`
+	Status     AttributeProofStatus    `json:"status"`
 }
 
 // Returns true if one of the disclosed credentials is expired at the specified time
@@ -118,39 +63,29 @@ func (disclosed DisclosedCredentialList) IsExpired(t time.Time) bool {
 	return false
 }
 
-func (proofResult *ProofResult) ToAttributeResultList() AttributeResultList {
-	var resultList AttributeResultList
-
-	for _, v := range proofResult.Disjunctions {
-		result := AttributeResult{
-			AttributeValue:       v.DisclosedValue,
-			AttributeId:          v.DisclosedId,
-			AttributeProofStatus: v.ProofStatus,
-		}
-
-		resultList = append(resultList, &result)
-	}
-	return resultList
-}
+func ExtractDisclosedCredentials(conf *Configuration, proofList gabi.ProofList) (DisclosedCredentialList, error) {
+	var credentials = make(DisclosedCredentialList, 0, len(proofList))
 
-// Returns true if this attrId is present in one of the disjunctions
-func (proofResult *ProofResult) ContainsAttribute(attrId AttributeTypeIdentifier) bool {
-	for _, disj := range proofResult.Disjunctions {
-		for _, attr := range disj.Attributes {
-			if attr == attrId {
-				return true
-			}
+	for _, v := range proofList {
+		switch v.(type) {
+		case *gabi.ProofD:
+			proof := v.(*gabi.ProofD)
+			cred := newDisclosedCredential(proof.ADisclosed, conf)
+			credentials = append(credentials, cred)
+		case *gabi.ProofU: // nop
+		default:
+			return nil, errors.New("Cannot extract credentials from proof, not a disclosure proofD")
 		}
 	}
 
-	return false
+	return credentials, nil
 }
 
 func (cred *DisclosedCredential) IsExpired(t time.Time) bool {
 	return cred.metadataAttribute.Expiry().Before(t)
 }
 
-func NewDisclosedCredentialFromADisclosed(aDisclosed map[int]*big.Int, configuration *Configuration) *DisclosedCredential {
+func newDisclosedCredential(aDisclosed map[int]*big.Int, configuration *Configuration) *DisclosedCredential {
 	rawAttributes := make(map[AttributeTypeIdentifier]*string)
 	attributes := make(map[AttributeTypeIdentifier]TranslatedString)
 
@@ -175,6 +110,9 @@ func NewDisclosedCredentialFromADisclosed(aDisclosed map[int]*big.Int, configura
 	}
 }
 
+// extractPublicKeys returns the public keys of each proof in the proofList, in the same order,
+// for later use in verification of the proofList. If one of the proofs is not a ProofD
+// an error is returned.
 func extractPublicKeys(configuration *Configuration, proofList gabi.ProofList) ([]*gabi.PublicKey, error) {
 	var publicKeys = make([]*gabi.PublicKey, 0, len(proofList))
 
@@ -195,169 +133,139 @@ func extractPublicKeys(configuration *Configuration, proofList gabi.ProofList) (