ts-mls/dist/src/crypto/aead.js

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import { Aes128Gcm, Aes256Gcm } from "@hpke/core";
import { bytesToBuffer } from "../util/byteArray";
import { DependencyError } from "../mlsError";
export async function makeAead(aeadAlg) {
    switch (aeadAlg) {
        case "AES128GCM":
            return {
                hpkeInterface() {
                    return new Aes128Gcm();
                },
                encrypt(key, nonce, aad, plaintext) {
                    return encryptAesGcm(key, nonce, aad, plaintext);
                },
                decrypt(key, nonce, aad, ciphertext) {
                    return decryptAesGcm(key, nonce, aad, ciphertext);
                },
            };
        case "AES256GCM":
            return {
                hpkeInterface() {
                    return new Aes256Gcm();
                },
                encrypt(key, nonce, aad, plaintext) {
                    return encryptAesGcm(key, nonce, aad, plaintext);
                },
                decrypt(key, nonce, aad, ciphertext) {
                    return decryptAesGcm(key, nonce, aad, ciphertext);
                },
            };
        case "CHACHA20POLY1305":
            try {
                const { Chacha20Poly1305 } = await import("@hpke/chacha20poly1305");
                const { chacha20poly1305 } = await import("@noble/ciphers/chacha");
                return {
                    hpkeInterface() {
                        return new Chacha20Poly1305();
                    },
                    async encrypt(key, nonce, aad, plaintext) {
                        return chacha20poly1305(key, nonce, aad).encrypt(plaintext);
                    },
                    async decrypt(key, nonce, aad, ciphertext) {
                        return chacha20poly1305(key, nonce, aad).decrypt(ciphertext);
                    },
                };
            }
            catch (err) {
                throw new DependencyError("Optional dependency '@hpke/chacha20poly1305' is not installed. Please install it to use this feature.");
            }
    }
}
async function encryptAesGcm(key, nonce, aad, plaintext) {
    const cryptoKey = await crypto.subtle.importKey("raw", bytesToBuffer(key), { name: "AES-GCM" }, false, ["encrypt"]);
    const result = await crypto.subtle.encrypt({
        name: "AES-GCM",
        iv: bytesToBuffer(nonce),
        additionalData: aad.length > 0 ? bytesToBuffer(aad) : undefined,
    }, cryptoKey, bytesToBuffer(plaintext));
    return new Uint8Array(result);
}
async function decryptAesGcm(key, nonce, aad, ciphertext) {
    const cryptoKey = await crypto.subtle.importKey("raw", bytesToBuffer(key), { name: "AES-GCM" }, false, ["decrypt"]);
    const result = await crypto.subtle.decrypt({
        name: "AES-GCM",
        iv: bytesToBuffer(nonce),
        additionalData: aad.length > 0 ? bytesToBuffer(aad) : undefined,
    }, cryptoKey, bytesToBuffer(ciphertext));
    return new Uint8Array(result);
}
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