signify-ts/src/keri/core/verfer.ts

Signing at the edge for KERI, ACDC, and KERIA

export {};
import libsodium from 'libsodium-wrappers-sumo';
import { Matter, MatterArgs, MtrDex } from './matter';
import secp256r1 from 'ecdsa-secp256r1';

/**
 * @description  Verfer :sublclass of Matter,helps to verify signature of serialization
 *  using .raw as verifier key and .code as signature cypher suite
 */
export class Verfer extends Matter {
    private readonly _verify: (sig: any, ser: any, key: any) => boolean;
    constructor({ raw, code, qb64, qb64b, qb2 }: MatterArgs) {
        super({ raw, code, qb64, qb64b, qb2 });

        if (Array.from([MtrDex.Ed25519N, MtrDex.Ed25519]).includes(this.code)) {
            this._verify = this._ed25519;
        } else if (
            Array.from([MtrDex.ECDSA_256r1N, MtrDex.ECDSA_256r1]).includes(
                this.code
            )
        ) {
            this._verify = this._secp256r1;
        } else {
            throw new Error(`Unsupported code = ${this.code} for verifier.`);
        }
    }

    verify(sig: any, ser: any) {
        return this._verify(sig, ser, this.raw);
    }

    _ed25519(sig: any, ser: any, key: any) {
        try {
            return libsodium.crypto_sign_verify_detached(sig, ser, key);
        } catch (error) {
            throw new Error(error as string);
        }
    }
    _secp256r1(sig: any, ser: any, key: any) {
        try {
            const publicKey = secp256r1.fromCompressedPublicKey(key);
            return publicKey.verify(ser, sig);
        } catch (error) {
            throw new Error(error as string);
        }
    }
}