anon-identity/dist/ld/signature-suites/ed25519-signature-2020.js

Decentralized identity framework with DIDs, Verifiable Credentials, and privacy-preserving selective disclosure

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.Ed25519Signature2020Suite = void 0;
const ed25519 = __importStar(require("@noble/ed25519"));
const sha512_1 = require("@noble/hashes/sha512");
const signature_suite_1 = require("./signature-suite");
// Configure ed25519 to use sha512
ed25519.etc.sha512Sync = (...m) => (0, sha512_1.sha512)(ed25519.etc.concatBytes(...m));
/**
 * Ed25519Signature2020 implementation
 * https://w3c-ccg.github.io/lds-ed25519-2020/
 */
class Ed25519Signature2020Suite extends signature_suite_1.SignatureSuite {
    constructor(options = {}) {
        super(options);
        this.type = 'Ed25519Signature2020';
        this.requiredKeyType = signature_suite_1.KeyType.Ed25519;
        this.supportsSelectiveDisclosure = false;
    }
    /**
     * Create an Ed25519 signature proof
     */
    async createProof(options) {
        try {
            // 1. Create proof metadata
            const proofMetadata = this.createProofMetadata(options);
            // 2. Canonicalize the document
            const canonicalDocument = await this.canonicalizeDocument(options.document);
            // 3. Create the verification hash
            const verifyData = await this.createVerifyData(canonicalDocument, proofMetadata);
            // 4. Sign the data
            const signature = await ed25519.sign(verifyData, options.privateKey);
            // 5. Create the final proof
            const proof = {
                ...proofMetadata,
                proofValue: Buffer.from(signature).toString('base64')
            };
            return proof;
        }
        catch (error) {
            throw new Error(`Failed to create Ed25519Signature2020: ${error}`);
        }
    }
    /**
     * Verify an Ed25519 signature proof
     */
    async verifyProof(options) {
        try {
            // 1. Validate proof metadata
            const metadataValidation = this.validateProofMetadata(options.proof, options);
            if (!metadataValidation.valid) {
                console.error('Proof metadata validation failed:', metadataValidation.error);
                return false;
            }
            // 2. Extract signature
            if (!options.proof.proofValue) {
                console.error('Missing proofValue');
                return false;
            }
            const signature = Buffer.from(options.proof.proofValue, 'base64');
            // 3. Canonicalize the document
            const canonicalDocument = await this.canonicalizeDocument(options.document);
            // 4. Create the verification hash
            const verifyData = await this.createVerifyData(canonicalDocument, options.proof);
            // 5. Verify the signature
            const isValid = await ed25519.verify(signature, verifyData, options.publicKey);
            return isValid;
        }
        catch (error) {
            console.error('Ed25519Signature2020 verification error:', error);
            return false;
        }
    }
    /**
     * Create the data to be signed/verified
     */
    async createVerifyData(canonicalDocument, proof) {
        // Create proof options without proofValue
        const proofOptions = { ...proof };
        delete proofOptions.proofValue;
        // Canonicalize proof options
        const canonicalProofOptions = await this.jsonLdProcessor.canonicalize(proofOptions);
        // Combine document and proof options
        const combined = canonicalDocument + canonicalProofOptions;
        // Hash the combined data
        return (0, sha512_1.sha512)(new TextEncoder().encode(combined));
    }
}
exports.Ed25519Signature2020Suite = Ed25519Signature2020Suite;
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