@ldclabs/cose-ts/dist/tag.js

Implemented Keys, Algorithms (RFC9053), COSE (RFC9052) and CWT (RFC8392) in TypeScript.

import { concatBytes } from './utils';
// encrypt0MessagePrefix represents the fixed prefix of COSE_Encrypt0_Tagged.
export const Encrypt0MessagePrefix = new Uint8Array([
    0xd0 // #6.16
]);
// mac0MessagePrefix represents the fixed prefix of COSE_Mac0_Tagged.
export const Mac0MessagePrefix = new Uint8Array([
    0xd1 // #6.17
]);
// sign1MessagePrefix represents the fixed prefix of COSE_Sign1_Tagged.
export const Sign1MessagePrefix = new Uint8Array([
    0xd2 // #6.18
]);
// cwtPrefix represents the fixed prefix of CWT CBOR tag.
// https://www.iana.org/assignments/cbor-tags/cbor-tags.xhtml#tags
export const CwtPrefix = new Uint8Array([
    0xd8,
    0x3d // #6.61
]);
// encryptMessagePrefix represents the fixed prefix of COSE_Encrypt_Tagged.
export const EncryptMessagePrefix = new Uint8Array([
    0xd8,
    0x60 // #6.96
]);
// macMessagePrefix represents the fixed prefix of COSE_Mac_Tagged.
export const MacMessagePrefix = new Uint8Array([
    0xd8,
    0x61 // #6.97
]);
// signMessagePrefix represents the fixed prefix of COSE_Sign_Tagged.
export const SignMessagePrefix = new Uint8Array([
    0xd8,
    0x62 // #6.98
]);
// https://www.rfc-editor.org/rfc/rfc8949.html#name-self-described-cbor
export const CBORSelfPrefix = new Uint8Array([0xd9, 0xd9, 0xf7]);
export function withTag(tag, data) {
    return concatBytes(tag, data);
}
export function skipTag(tag, data) {
    if (data.length < tag.length) {
        return data;
    }
    for (let i = 0; i < tag.length; i++) {
        if (data[i] !== tag[i]) {
            return data;
        }
    }
    return data.subarray(tag.length);
}
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