Refactor verification, integrity, parsing

credential/builder.go

@@ -187,10 +187,6 @@ func (vcb *VerifiableCredentialBuilder) SetCredentialSubject(subject CredentialS
 		return errors.New(BuilderEmptyError)
 	}
 
-	if subject.GetID() == "" {
-		return errors.New("credential subject must have an ID property")
-	}
-
 	vcb.CredentialSubject = subject
 	return nil
 }

credential/builder_test.go

@@ -168,13 +168,12 @@ func TestCredentialBuilder(t *testing.T) {
 	err = builder.SetCredentialStatus(status)
 	assert.NoError(t, err)
 
-	// bad cred subject - no id
-	badSubject := CredentialSubject{
+	// cred subject - no id
+	subjectWithMissingID := CredentialSubject{
 		"name": "Satoshi",
 	}
-	err = builder.SetCredentialSubject(badSubject)
-	assert.Error(t, err)
-	assert.Contains(t, err.Error(), "credential subject must have an ID property")
+	err = builder.SetCredentialSubject(subjectWithMissingID)
+	assert.NoError(t, err)
 
 	// good subject
 	subject := CredentialSubject{

credential/exchange/submission.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/TBD54566975/ssi-sdk/credential"
+	"github.com/TBD54566975/ssi-sdk/credential/integrity"
 	"github.com/TBD54566975/ssi-sdk/crypto/jwx"
 	"github.com/TBD54566975/ssi-sdk/util"
 	"github.com/goccy/go-json"
@@ -165,7 +166,7 @@ func BuildPresentationSubmission(signer any, requester string, def PresentationD
 		if err != nil {
 			return nil, errors.Wrap(err, "unable to fulfill presentation definition with given credentials")
 		}
-		return credential.SignVerifiablePresentationJWT(jwtSigner, credential.JWTVVPParameters{Audience: []string{requester}}, *vpSubmission)
+		return integrity.SignVerifiablePresentationJWT(jwtSigner, integrity.JWTVVPParameters{Audience: []string{requester}}, *vpSubmission)
 	default:
 		return nil, fmt.Errorf("presentation submission embed target <%s> is not implemented", et)
 	}

credential/exchange/submission_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"testing"
 
+	"github.com/TBD54566975/ssi-sdk/credential/integrity"
 	"github.com/TBD54566975/ssi-sdk/cryptosuite/jws2020"
 	"github.com/goccy/go-json"
 	"github.com/oliveagle/jsonpath"
@@ -64,7 +65,7 @@ func TestBuildPresentationSubmission(t *testing.T) {
 
 		resolver, err := resolution.NewResolver([]resolution.Resolver{key.Resolver{}}...)
 		assert.NoError(tt, err)
-		_, _, _, err = credential.VerifyVerifiablePresentationJWT(context.Background(), *verifier, resolver, string(submissionBytes))
+		_, _, _, err = integrity.VerifyVerifiablePresentationJWT(context.Background(), *verifier, resolver, string(submissionBytes))
 		assert.Error(tt, err)
 		assert.Contains(tt, err.Error(), "credential must have a proof")
 	})
@@ -92,7 +93,7 @@ func TestBuildPresentationSubmission(t *testing.T) {
 		signer, verifier := getJWKSignerVerifier(tt)
 		testVC := getTestVerifiableCredential(signer.ID, signer.ID)
 
-		credJWT, err := credential.SignVerifiableCredentialJWT(*signer, testVC)
+		credJWT, err := integrity.SignVerifiableCredentialJWT(*signer, testVC)
 		assert.NoError(tt, err)
 		assert.NotEmpty(tt, credJWT)
 
@@ -107,7 +108,7 @@ func TestBuildPresentationSubmission(t *testing.T) {
 
 		resolver, err := resolution.NewResolver([]resolution.Resolver{key.Resolver{}}...)
 		assert.NoError(tt, err)
-		_, _, vp, err := credential.VerifyVerifiablePresentationJWT(context.Background(), *verifier, resolver, string(submissionBytes))
+		_, _, vp, err := integrity.VerifyVerifiablePresentationJWT(context.Background(), *verifier, resolver, string(submissionBytes))
 		assert.NoError(tt, err)
 
 		assert.NoError(tt, vp.IsValid())
@@ -358,7 +359,7 @@ func TestBuildPresentationSubmissionVP(t *testing.T) {
 		assert.Equal(tt, "test-verifiable-credential", asVC.ID)
 		assert.Equal(tt, "Block", asVC.CredentialSubject["company"])
 
-		_, vcJWTToken, asVCJWT, err := credential.ParseVerifiableCredentialFromJWT(*(vp.VerifiableCredential[1].(*string)))
+		_, vcJWTToken, asVCJWT, err := integrity.ParseVerifiableCredentialFromJWT(*(vp.VerifiableCredential[1].(*string)))
 		assert.NoError(tt, err)
 		assert.NotEmpty(tt, vcJWTToken)
 		assert.NotEmpty(tt, asVCJWT)

credential/exchange/verification.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/TBD54566975/ssi-sdk/credential/integrity"
+	"github.com/TBD54566975/ssi-sdk/credential/parsing"
 	"github.com/TBD54566975/ssi-sdk/crypto/jwx"
 	"github.com/TBD54566975/ssi-sdk/did/resolution"
 	"github.com/TBD54566975/ssi-sdk/schema"
@@ -56,7 +58,7 @@ func VerifyPresentationSubmission(ctx context.Context, verifier any, resolver re
 			return nil, fmt.Errorf("verifier<%T> is not a JWT verifier", verifier)
 		}
 		// verify the VP, which in turn verifies all credentials in it
-		_, _, vp, err := credential.VerifyVerifiablePresentationJWT(ctx, jwtVerifier, resolver, string(submission))
+		_, _, vp, err := integrity.VerifyVerifiablePresentationJWT(ctx, jwtVerifier, resolver, string(submission))
 		if err != nil {
 			return nil, errors.Wrap(err, "verification of the presentation submission failed")
 		}
@@ -134,8 +136,8 @@ func VerifyPresentationSubmissionVP(def PresentationDefinition, vp credential.Ve
 				submissionDescriptor.ID, submissionDescriptor.Path)
 		}
 
-		// TODO(gabe) add in signature verification of claims here https://github.com/TBD54566975/ssi-sdk/issues/71
-		_, _, cred, err := credential.ToCredential(claim)
+		// get the credential from the claim
+		_, _, cred, err := parsing.ToCredential(claim)
 		if err != nil {
 			return nil, errors.Wrapf(err, "getting claim as json: <%s>", claim)
 		}
@@ -150,7 +152,7 @@ func VerifyPresentationSubmissionVP(def PresentationDefinition, vp credential.Ve
 
 		// TODO(gabe) consider enforcing limited disclosure if present
 		// for each field we need to verify at least one path matches
-		credJSON, err := credential.ToCredentialJSONMap(claim)
+		credJSON, err := parsing.ToCredentialJSONMap(claim)
 		if err != nil {
 			return nil, errors.Wrapf(err, "getting credential as json: %v", cred)
 		}

credential/exchange/verification_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"testing"
 
+	"github.com/TBD54566975/ssi-sdk/credential/integrity"
 	"github.com/TBD54566975/ssi-sdk/cryptosuite/jws2020"
 	"github.com/stretchr/testify/assert"
 
@@ -138,7 +139,7 @@ func TestVerifyPresentationSubmission(t *testing.T) {
 
 		signer, verifier := getJWKSignerVerifier(tt)
 		testVC := getTestVerifiableCredential(signer.ID, signer.ID)
-		credJWT, err := credential.SignVerifiableCredentialJWT(*signer, testVC)
+		credJWT, err := integrity.SignVerifiableCredentialJWT(*signer, testVC)
 		assert.NoError(tt, err)
 		presentationClaim := PresentationClaim{
 			Token:                         util.StringPtr(string(credJWT)),
@@ -186,7 +187,7 @@ func TestVerifyPresentationSubmissionVP(t *testing.T) {
 		assert.NoError(tt, err)
 		assert.NotEmpty(tt, submissionBytes)
 
-		_, _, verifiablePresentation, err := credential.ParseVerifiablePresentationFromJWT(string(submissionBytes))
+		_, _, verifiablePresentation, err := integrity.ParseVerifiablePresentationFromJWT(string(submissionBytes))
 		assert.NoError(tt, err)
 
 		_, err = VerifyPresentationSubmissionVP(def, *verifiablePresentation)
@@ -523,7 +524,7 @@ func TestVerifyPresentationSubmissionVP(t *testing.T) {
 		}
 		signer, _ := getJWKSignerVerifier(tt)
 		testVC := getTestVerifiableCredential("test-issuer", "test-subject")
-		vcData, err := credential.SignVerifiableCredentialJWT(*signer, testVC)
+		vcData, err := integrity.SignVerifiableCredentialJWT(*signer, testVC)
 		assert.NoError(tt, err)
 		b := NewPresentationSubmissionBuilder(def.ID)
 		assert.NoError(tt, b.SetDescriptorMap([]SubmissionDescriptor{

credential/jws.go → credential/integrity/jws.go

@@ -1,6 +1,7 @@
-package credential
+package integrity
 
 import (
+	"github.com/TBD54566975/ssi-sdk/credential"
 	"github.com/TBD54566975/ssi-sdk/crypto/jwx"
 	"github.com/goccy/go-json"
 	"github.com/lestrrat-go/jwx/v2/jwa"
@@ -14,7 +15,7 @@ const (
 
 // SignVerifiableCredentialJWS is prepared according to https://transmute-industries.github.io/vc-jws/.
 // This is currently an experimental. It's unstable and subject to change. Use at your own peril.
-func SignVerifiableCredentialJWS(signer jwx.Signer, cred VerifiableCredential) ([]byte, error) {
+func SignVerifiableCredentialJWS(signer jwx.Signer, cred credential.VerifiableCredential) ([]byte, error) {
 	payload, err := json.Marshal(cred)
 	if err != nil {
 		return nil, errors.Wrap(err, "marshalling credential")
@@ -38,7 +39,7 @@ func SignVerifiableCredentialJWS(signer jwx.Signer, cred VerifiableCredential) (
 // ParseVerifiableCredentialFromJWS parses a JWS. Depending on the `cty` header value, it parses as a JWT or simply
 // decodes the payload.
 // This is currently an experimental. It's unstable and subject to change. Use at your own peril.
-func ParseVerifiableCredentialFromJWS(token string) (*jws.Message, *VerifiableCredential, error) {
+func ParseVerifiableCredentialFromJWS(token string) (*jws.Message, *credential.VerifiableCredential, error) {
 	parsed, err := jws.Parse([]byte(token))
 	if err != nil {
 		return nil, nil, errors.Wrap(err, "parsing JWS")
@@ -55,7 +56,7 @@ func ParseVerifiableCredentialFromJWS(token string) (*jws.Message, *VerifiableCr
 		return parsed, cred, err
 	}
 
-	var cred VerifiableCredential
+	var cred credential.VerifiableCredential
 	if err = json.Unmarshal(parsed.Payload(), &cred); err != nil {
 		return nil, nil, errors.Wrap(err, "reconstructing Verifiable Credential")
 	}
@@ -66,7 +67,7 @@ func ParseVerifiableCredentialFromJWS(token string) (*jws.Message, *VerifiableCr
 // VerifyVerifiableCredentialJWS verifies the signature validity on the token and parses
 // the token in a verifiable credential.
 // This is currently an experimental. It's unstable and subject to change. Use at your own peril.
-func VerifyVerifiableCredentialJWS(verifier jwx.Verifier, token string) (*jws.Message, *VerifiableCredential, error) {
+func VerifyVerifiableCredentialJWS(verifier jwx.Verifier, token string) (*jws.Message, *credential.VerifiableCredential, error) {
 	if err := verifier.VerifyJWS(token); err != nil {
 		return nil, nil, errors.Wrap(err, "verifying JWS")
 	}

credential/jws_test.go → credential/integrity/jws_test.go

@@ -1,16 +1,17 @@
-package credential
+package integrity
 
 import (
 	"context"
 	"testing"
 
+	"github.com/TBD54566975/ssi-sdk/credential"
 	"github.com/lestrrat-go/jwx/v2/jws"
 	"github.com/lestrrat-go/jwx/v2/jwt"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestVerifiableCredentialJWS(t *testing.T) {
-	testCredential := VerifiableCredential{
+	testCredential := credential.VerifiableCredential{
 		Context:           []any{"https://www.w3.org/2018/credentials/v1", "https://w3id.org/security/suites/jws-2020/v1"},
 		Type:              []any{"VerifiableCredential"},
 		Issuer:            "did:example:123",

credential/jwt.go → credential/integrity/jwt.go

@@ -1,10 +1,11 @@
-package credential
+package integrity
 
 import (
 	"context"
 	"fmt"
 	"time"
 
+	"github.com/TBD54566975/ssi-sdk/credential"
 	"github.com/TBD54566975/ssi-sdk/crypto/jwx"
 	"github.com/TBD54566975/ssi-sdk/did/resolution"
 
@@ -24,7 +25,7 @@ const (
 
 // SignVerifiableCredentialJWT is prepared according to https://w3c.github.io/vc-jwt/#version-1.1
 // which will soon be deprecated by https://w3c.github.io/vc-jwt/ see: https://github.com/TBD54566975/ssi-sdk/issues/191
-func SignVerifiableCredentialJWT(signer jwx.Signer, cred VerifiableCredential) ([]byte, error) {
+func SignVerifiableCredentialJWT(signer jwx.Signer, cred credential.VerifiableCredential) ([]byte, error) {
 	if cred.IsEmpty() {
 		return nil, errors.New("credential cannot be empty")
 	}
@@ -98,9 +99,9 @@ func SignVerifiableCredentialJWT(signer jwx.Signer, cred VerifiableCredential) (
 
 // VerifyVerifiableCredentialJWT verifies the signature validity on the token and parses
 // the token in a verifiable credential.
-// TODO(gabe) modify this to add additional verification steps such as credential status, expiration, etc.
+// TODO(gabe) modify this to add additional validation steps such as credential status, expiration, etc.
 // related to https://github.com/TBD54566975/ssi-service/issues/122
-func VerifyVerifiableCredentialJWT(verifier jwx.Verifier, token string) (jws.Headers, jwt.Token, *VerifiableCredential, error) {
+func VerifyVerifiableCredentialJWT(verifier jwx.Verifier, token string) (jws.Headers, jwt.Token, *credential.VerifiableCredential, error) {
 	if err := verifier.Verify(token); err != nil {
 		return nil, nil, nil, errors.Wrap(err, "verifying JWT")
 	}
@@ -111,7 +112,7 @@ func VerifyVerifiableCredentialJWT(verifier jwx.Verifier, token string) (jws.Hea
 // https://www.w3.org/TR/vc-data-model/#jwt-decoding
 // If there are any issues during decoding, an error is returned. As a result, a successfully
 // decoded VerifiableCredential object is returned.
-func ParseVerifiableCredentialFromJWT(token string) (jws.Headers, jwt.Token, *VerifiableCredential, error) {
+func ParseVerifiableCredentialFromJWT(token string) (jws.Headers, jwt.Token, *credential.VerifiableCredential, error) {
 	parsed, err := jwt.Parse([]byte(token), jwt.WithValidate(false), jwt.WithVerify(false))
 	if err != nil {
 		return nil, nil, nil, errors.Wrap(err, "parsing credential token")
@@ -133,7 +134,7 @@ func ParseVerifiableCredentialFromJWT(token string) (jws.Headers, jwt.Token, *Ve
 }
 
 // ParseVerifiableCredentialFromToken takes a JWT object and parses it into a VerifiableCredential
-func ParseVerifiableCredentialFromToken(token jwt.Token) (*VerifiableCredential, error) {
+func ParseVerifiableCredentialFromToken(token jwt.Token) (*credential.VerifiableCredential, error) {
 	// parse remaining JWT properties and set in the credential
 	vcClaim, ok := token.Get(VCJWTProperty)
 	if !ok {
@@ -143,7 +144,7 @@ func ParseVerifiableCredentialFromToken(token jwt.Token) (*VerifiableCredential,
 	if err != nil {
 		return nil, errors.Wrap(err, "marshalling credential claim")
 	}
-	var cred VerifiableCredential
+	var cred credential.VerifiableCredential
 	if err = json.Unmarshal(vcBytes, &cred); err != nil {
 		return nil, errors.Wrap(err, "reconstructing Verifiable Credential")
 	}
@@ -179,7 +180,7 @@ func ParseVerifiableCredentialFromToken(token jwt.Token) (*VerifiableCredential,
 		if cred.CredentialSubject == nil {
 			cred.CredentialSubject = make(map[string]any)
 		}
-		cred.CredentialSubject[VerifiableCredentialIDProperty] = subStr
+		cred.CredentialSubject[credential.VerifiableCredentialIDProperty] = subStr
 	}
 
 	return &cred, nil
@@ -195,7 +196,7 @@ type JWTVVPParameters struct {
 
 // SignVerifiablePresentationJWT transforms a VP into a VP JWT and signs it
 // According to https://w3c.github.io/vc-jwt/#version-1.1
-func SignVerifiablePresentationJWT(signer jwx.Signer, parameters JWTVVPParameters, presentation VerifiablePresentation) ([]byte, error) {
+func SignVerifiablePresentationJWT(signer jwx.Signer, parameters JWTVVPParameters, presentation credential.VerifiablePresentation) ([]byte, error) {
 	if presentation.IsEmpty() {
 		return nil, errors.New("presentation cannot be empty")
 	}
@@ -270,7 +271,7 @@ func SignVerifiablePresentationJWT(signer jwx.Signer, parameters JWTVVPParameter
 // After decoding the signature of each credential in the presentation is verified. If there are any issues during
 // decoding or signature validation, an error is returned. As a result, a successfully decoded VerifiablePresentation
 // object is returned.
-func VerifyVerifiablePresentationJWT(ctx context.Context, verifier jwx.Verifier, r resolution.Resolver, token string) (jws.Headers, jwt.Token, *VerifiablePresentation, error) {
+func VerifyVerifiablePresentationJWT(ctx context.Context, verifier jwx.Verifier, r resolution.Resolver, token string) (jws.Headers, jwt.Token, *credential.VerifiablePresentation, error) {
 	if r == nil {
 		return nil, nil, nil, errors.New("r cannot be empty")
 	}
@@ -306,7 +307,7 @@ func VerifyVerifiablePresentationJWT(ctx context.Context, verifier jwx.Verifier,
 			return nil, nil, nil, errors.Wrapf(err, "verifying credential %d", i)
 		}
 		if !verified {
-			return nil, nil, nil, errors.Errorf("credential %d failed signature verification", i)
+			return nil, nil, nil, errors.Errorf("credential %d failed signature validation", i)
 		}
 	}
 
@@ -318,7 +319,7 @@ func VerifyVerifiablePresentationJWT(ctx context.Context, verifier jwx.Verifier,
 // https://www.w3.org/TR/vc-data-model/#jwt-decoding
 // If there are any issues during decoding, an error is returned. As a result, a successfully
 // decoded VerifiablePresentation object is returned.
-func ParseVerifiablePresentationFromJWT(token string) (jws.Headers, jwt.Token, *VerifiablePresentation, error) {
+func ParseVerifiablePresentationFromJWT(token string) (jws.Headers, jwt.Token, *credential.VerifiablePresentation, error) {
 	parsed, err := jwt.Parse([]byte(token), jwt.WithValidate(false), jwt.WithVerify(false))
 	if err != nil {
 		return nil, nil, nil, errors.Wrap(err, "parsing vp token")
@@ -331,7 +332,7 @@ func ParseVerifiablePresentationFromJWT(token string) (jws.Headers, jwt.Token, *
 	if err != nil {
 		return nil, nil, nil, errors.Wrap(err, "could not marshalling vp claim")
 	}
-	var pres VerifiablePresentation
+	var pres credential.VerifiablePresentation
 	if err = json.Unmarshal(vpBytes, &pres); err != nil {
 		return nil, nil, nil, errors.Wrap(err, "reconstructing Verifiable Presentation")
 	}