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OpenID4VP: E2EE implementation - Encrypted Response #362

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merged 1 commit into from
Oct 16, 2024
Merged

OpenID4VP: E2EE implementation - Encrypted Response #362

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34 changes: 27 additions & 7 deletions src/lib/services/OpenID4VPRelyingParty.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ import { Verify } from "../utils/Verify";
import { HasherAlgorithm, HasherAndAlgorithm, SdJwt } from "@sd-jwt/core";
import { VerifiableCredentialFormat } from "../schemas/vc";
import { generateRandomIdentifier } from "../utils/generateRandomIdentifier";
import { base64url, importX509, jwtVerify } from "jose";
import { base64url, EncryptJWT, importJWK, importX509, jwtVerify } from "jose";
import { OpenID4VPRelyingPartyState } from "../types/OpenID4VPRelyingPartyState";
import { OpenID4VPRelyingPartyStateRepository } from "./OpenID4VPRelyingPartyStateRepository";
import { IHttpProxy } from "../interfaces/IHttpProxy";
Expand Down Expand Up @@ -34,7 +34,7 @@ export class OpenID4VPRelyingParty implements IOpenID4VPRelyingParty {
let state = authorizationRequest.searchParams.get('state') as string;
let presentation_definition = authorizationRequest.searchParams.get('presentation_definition') ? JSON.parse(authorizationRequest.searchParams.get('presentation_definition')) : null;
let presentation_definition_uri = authorizationRequest.searchParams.get('presentation_definition_uri');

let client_metadata = authorizationRequest.searchParams.get('client_metadata') ? JSON.parse(authorizationRequest.searchParams.get('client_metadata')) : null;

if (presentation_definition_uri) {
const presentationDefinitionFetch = await this.httpProxy.get(presentation_definition_uri, {});
Expand All @@ -61,6 +61,7 @@ export class OpenID4VPRelyingParty implements IOpenID4VPRelyingParty {
client_id = p.client_id;
presentation_definition = p.presentation_definition;
response_uri = p.response_uri ?? p.redirect_uri;
client_metadata = p.client_metadata;

state = p.state;
nonce = p.nonce;
Expand Down Expand Up @@ -119,7 +120,8 @@ export class OpenID4VPRelyingParty implements IOpenID4VPRelyingParty {
nonce,
response_uri,
client_id,
state
state,
client_metadata
));

const mapping = new Map<string, { credentials: string[], requestedFields: string[] }>();
Expand Down Expand Up @@ -285,11 +287,29 @@ export class OpenID4VPRelyingParty implements IOpenID4VPRelyingParty {
};

const formData = new URLSearchParams();
formData.append('vp_token', generatedVPs[0]);
formData.append('presentation_submission', JSON.stringify(presentationSubmission));
if (S.state) {
formData.append('state', S.state);

if (S.client_metadata.authorization_encrypted_response_alg && S.client_metadata.jwks.keys.length > 0) {
const rp_eph_pub_jwk = S.client_metadata.jwks.keys[0];
const rp_eph_pub = await importJWK(rp_eph_pub_jwk, S.client_metadata.authorization_encrypted_response_alg);
const jwe = await new EncryptJWT({
vp_token: generatedVPs[0],
presentation_submission: presentationSubmission,
state: S.state ?? undefined
})
.setProtectedHeader({ alg: S.client_metadata.authorization_encrypted_response_alg, enc: S.client_metadata.authorization_encrypted_response_enc, kid: rp_eph_pub_jwk.kid })
.encrypt(rp_eph_pub);

formData.append('response', jwe);
console.log("JWE = ", jwe)
}
else {
formData.append('vp_token', generatedVPs[0]);
formData.append('presentation_submission', JSON.stringify(presentationSubmission));
if (S.state) {
formData.append('state', S.state);
}
}


const credentialIdentifiers = originalVCs.map((vc) => vc.credentialIdentifier);

Expand Down
14 changes: 12 additions & 2 deletions src/lib/types/OpenID4VPRelyingPartyState.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,13 @@
import { JWK } from "jose";
import { PresentationDefinitionType } from "./presentationDefinition.type";


type ClientMetadata = {
jwks?: { keys: JWK[] },
authorization_encrypted_response_alg?: string;
authorization_encrypted_response_enc?: string;
vp_formats: any;
}
/**
* serializable
*/
Expand All @@ -11,6 +19,7 @@ export class OpenID4VPRelyingPartyState {
public response_uri: string,
public client_id: string,
public state: string,
public client_metadata: ClientMetadata
) { }

public serialize(): string {
Expand All @@ -20,11 +29,12 @@ export class OpenID4VPRelyingPartyState {
response_uri: this.response_uri,
client_id: this.client_id,
state: this.state,
client_metadata: this.client_metadata,
});
}

public static deserialize(storedValue: string): OpenID4VPRelyingPartyState {
const { presentation_definition, nonce, response_uri, client_id, state } = JSON.parse(storedValue) as OpenID4VPRelyingPartyState;
return new OpenID4VPRelyingPartyState(presentation_definition, nonce, response_uri, client_id, state);
const { presentation_definition, nonce, response_uri, client_id, state, client_metadata } = JSON.parse(storedValue) as OpenID4VPRelyingPartyState;
return new OpenID4VPRelyingPartyState(presentation_definition, nonce, response_uri, client_id, state, client_metadata);
}
}
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