@nfen/webcrypto-ts/lib/aes/aes_ctr.js

Enforced Webcrypto wrapper

/**
 * Code related to AES_CTR mode
 * @module
 */
import * as proxy from "../proxy.js";
import { getValues } from "../random.js";
import { AesShared, Alg, } from "./shared.js";
/** @hidden */
export const handler = {
    get(target, prop) {
        switch (prop) {
            case "self":
                return target;
            case "encrypt":
                return (algorithm, data) => encrypt(algorithm, target, data);
            case "decrypt":
                return (algorithm, data) => decrypt(algorithm, target, data);
            case "wrapKey":
                return (format, key, wrapAlgorithm) => wrapKey(format, key, target, wrapAlgorithm);
            case "unwrapKey":
                return (format, wrappedKey, wrappedKeyAlgorithm, unwrappingKeyAlgorithm, extractable, keyUsages) => unwrapKey(format, wrappedKey, wrappedKeyAlgorithm, target, unwrappingKeyAlgorithm, extractable, keyUsages);
            case "exportKey":
                return (format) => exportKey(format, target);
        }
        return Reflect.get(target, prop);
    },
};
/**
 * Generates a counter, with the given length, starting from the count of 1. The nonce is randomized.
 * @see https://developer.mozilla.org/en-US/docs/Web/API/AesCtrParams
 * @example
 * ```ts
 * const counter = await AES_CTR.generateCounter();
 * ```
 */
export async function generateCounter(counterLength = 8) {
    const nonce = await getValues(16 - counterLength);
    const counter = new Uint8Array(16);
    counter.set([1], 15);
    counter.set(nonce);
    return counter;
}
/**
 * Generate a new AES_CTR key
 * @example
 * ```ts
 * const key = await AES_CTR.generateKey();
 * ```
 */
export async function generateKey(algorithm = {
    length: 256,
}, extractable = true, keyUsages) {
    const key = await AesShared.generateKey({
        ...algorithm,
        name: Alg.Mode.AES_CTR,
    }, extractable, keyUsages);
    return proxy.proxifyKey(handler)(key);
}
/**
 * Import an AES_CTR key from the specified format
 * @example
 * ```ts
 * const key = await AES_CTR.importKey("jwk", jwk, { length: 256 });
 * ```
 */
export async function importKey(format, key, algorithm, extractable, keyUsages) {
    const importedKey = (await AesShared.importKey(format, key, {
        ...algorithm,
        name: Alg.Mode.AES_CTR,
    }, extractable, keyUsages));
    return proxy.proxifyKey(handler)(importedKey);
}
/**
 * Export an AES_CTR key into the specified format
 * @example
 * ```ts
 * const key = await AES_CTR.generateKey();
 * const jwk = await AES_CTR.exportKey("jwk", key.self);
 * ```
 * @example
 * ```ts
 * const key = await AES_CTR.generateKey();
 * const jwk = await key.exportKey("jwk");
 * ```
 */
export const exportKey = async (format, key) => AesShared.exportKey(format, key);
/**
 * Encrypt with an AES_CTR key
 * @example
 * ```ts
 * const key = await AES_CTR.generateKey();
 * const message = new TextEncoder().encode("a message");
 * const length = 8;
 * const counter = await AES_CTR.generateCounter(length);
 * const data = await AES_CTR.encrypt({length, counter}, key.self, message);
 * ```
 * @example
 * ```ts
 * const key = await AES_CTR.generateKey();
 * const message = new TextEncoder().encode("a message");
 * const length = 8;
 * const counter = await AES_CTR.generateCounter(length);
 * const data = await key.encrypt({length, counter}, message);
 * ```
 */
export async function encrypt(algorithm, key, data) {
    return await AesShared.encrypt({
        ...algorithm,
        name: Alg.Mode.AES_CTR,
    }, key, data);
}
/**
 * Decrypt with an AES_CTR key
 * @example
 * ```ts
 * const data = await AES_CTR.decrypt({length, counter}, key.self, data);
 * ```
 * @example
 * ```ts
 * const data = await key.decrypt({length, counter}, data);
 * ```
 */
export async function decrypt(algorithm, key, data) {
    return await AesShared.decrypt({
        ...algorithm,
        name: Alg.Mode.AES_CTR,
    }, key, data);
}
/**
 * Wrap another key with an AES_CTR key
 * @example
 * ```ts
 * const kek = await AES_CTR.generateKey({length: 256}, true, ['wrapKey', 'unwrapKey']);
 * const dek = await AES_CTR.generateKey();
 * const length = 8;
 * const counter = await AES_CTR.generateCounter(length);
 * const wrappedKey = await AES_CTR.wrapKey("raw", dek.self, kek.self, {length, counter});
 * ```
 * @example
 * ```ts
 * const kek = await AES_CTR.generateKey({length: 256}, true, ['wrapKey', 'unwrapKey']);
 * const dek = await AES_CTR.generateKey();
 * const length = 8;
 * const counter = await AES_CTR.generateCounter(length);
 * const wrappedKey = await kek.wrapKey("raw", dek.self, {length, counter});
 * ```
 */
export async function wrapKey(format, key, wrappingkey, wrapAlgorithm) {
    return await AesShared.wrapKey(format, key, wrappingkey, {
        ...wrapAlgorithm,
        name: Alg.Mode.AES_CTR,
    });
}
/**
 * Unwrap a wrapped key using the key encryption key
 * @example
 * ```ts
 * const dek = await AES_CTR.unwrapKey("raw", wrappedKey, {name: "AES_CTR"}, kek.self, {length, counter});
 * ```
 * @example
 * ```ts
 * const dek = await kek.unwrapKey("raw", wrappedKey, {name: "AES_CTR"}, {length, counter});
 * ```
 */
export async function unwrapKey(format, wrappedKey, wrappedKeyAlgorithm, unwrappingKey, unwrappingKeyAlgorithm, extractable = true, keyUsages) {
    return await AesShared.unwrapKey(format, wrappedKey, wrappedKeyAlgorithm, unwrappingKey, {
        ...unwrappingKeyAlgorithm,
        name: Alg.Mode.AES_CTR,
    }, extractable, keyUsages);
}
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