@gaonengwww/jose
Version:
JWA, JWS, JWE, JWT, JWK, JWKS for Node.js, Browser, Cloudflare Workers, Deno, Bun, and other Web-interoperable runtimes
827 lines (802 loc) • 25.4 kB
JavaScript
;
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
for (var name in all)
__defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
if (from && typeof from === "object" || typeof from === "function") {
for (let key of __getOwnPropNames(from))
if (!__hasOwnProp.call(to, key) && key !== except)
__defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
}
return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
// src/lib/decrypt_key_management.ts
var decrypt_key_management_exports = {};
__export(decrypt_key_management_exports, {
default: () => decrypt_key_management_default
});
module.exports = __toCommonJS(decrypt_key_management_exports);
// src/lib/crypto_key.ts
function unusable(name, prop = "algorithm.name") {
return new TypeError(`CryptoKey does not support this operation, its ${prop} must be ${name}`);
}
function isAlgorithm(algorithm, name) {
return algorithm.name === name;
}
function getHashLength(hash) {
return parseInt(hash.name.slice(4), 10);
}
function checkUsage(key, usage) {
if (usage && !key.usages.includes(usage)) {
throw new TypeError(
`CryptoKey does not support this operation, its usages must include ${usage}.`
);
}
}
function checkEncCryptoKey(key, alg, usage) {
switch (alg) {
case "A128GCM":
case "A192GCM":
case "A256GCM": {
if (!isAlgorithm(key.algorithm, "AES-GCM")) throw unusable("AES-GCM");
const expected = parseInt(alg.slice(1, 4), 10);
const actual = key.algorithm.length;
if (actual !== expected) throw unusable(expected, "algorithm.length");
break;
}
case "A128KW":
case "A192KW":
case "A256KW": {
if (!isAlgorithm(key.algorithm, "AES-KW")) throw unusable("AES-KW");
const expected = parseInt(alg.slice(1, 4), 10);
const actual = key.algorithm.length;
if (actual !== expected) throw unusable(expected, "algorithm.length");
break;
}
case "ECDH": {
switch (key.algorithm.name) {
case "ECDH":
case "X25519":
break;
default:
throw unusable("ECDH or X25519");
}
break;
}
case "PBES2-HS256+A128KW":
case "PBES2-HS384+A192KW":
case "PBES2-HS512+A256KW":
if (!isAlgorithm(key.algorithm, "PBKDF2")) throw unusable("PBKDF2");
break;
case "RSA-OAEP":
case "RSA-OAEP-256":
case "RSA-OAEP-384":
case "RSA-OAEP-512": {
if (!isAlgorithm(key.algorithm, "RSA-OAEP")) throw unusable("RSA-OAEP");
const expected = parseInt(alg.slice(9), 10) || 1;
const actual = getHashLength(key.algorithm.hash);
if (actual !== expected) throw unusable(`SHA-${expected}`, "algorithm.hash");
break;
}
default:
throw new TypeError("CryptoKey does not support this operation");
}
checkUsage(key, usage);
}
// src/lib/aeskw.ts
function checkKeySize(key, alg) {
if (key.algorithm.length !== parseInt(alg.slice(1, 4), 10)) {
throw new TypeError(`Invalid key size for alg: ${alg}`);
}
}
function getCryptoKey(key, alg, usage) {
if (key instanceof Uint8Array) {
return crypto.subtle.importKey("raw", key, "AES-KW", true, [usage]);
}
checkEncCryptoKey(key, alg, usage);
return key;
}
async function unwrap(alg, key, encryptedKey) {
const cryptoKey = await getCryptoKey(key, alg, "unwrapKey");
checkKeySize(cryptoKey, alg);
const cryptoKeyCek = await crypto.subtle.unwrapKey(
"raw",
encryptedKey,
cryptoKey,
"AES-KW",
{ hash: "SHA-256", name: "HMAC" },
true,
["sign"]
);
return new Uint8Array(await crypto.subtle.exportKey("raw", cryptoKeyCek));
}
// src/lib/buffer_utils.ts
var encoder = new TextEncoder();
var decoder = new TextDecoder();
var MAX_INT32 = 2 ** 32;
function concat(...buffers) {
const size = buffers.reduce((acc, { length }) => acc + length, 0);
const buf = new Uint8Array(size);
let i = 0;
for (const buffer of buffers) {
buf.set(buffer, i);
i += buffer.length;
}
return buf;
}
function writeUInt32BE(buf, value, offset) {
if (value < 0 || value >= MAX_INT32) {
throw new RangeError(`value must be >= 0 and <= ${MAX_INT32 - 1}. Received ${value}`);
}
buf.set([value >>> 24, value >>> 16, value >>> 8, value & 255], offset);
}
function uint64be(value) {
const high = Math.floor(value / MAX_INT32);
const low = value % MAX_INT32;
const buf = new Uint8Array(8);
writeUInt32BE(buf, high, 0);
writeUInt32BE(buf, low, 4);
return buf;
}
function uint32be(value) {
const buf = new Uint8Array(4);
writeUInt32BE(buf, value);
return buf;
}
// src/lib/digest.ts
var digest_default = async (algorithm, data) => {
const subtleDigest = `SHA-${algorithm.slice(-3)}`;
return new Uint8Array(await crypto.subtle.digest(subtleDigest, data));
};
// src/lib/ecdhes.ts
function lengthAndInput(input) {
return concat(uint32be(input.length), input);
}
async function concatKdf(secret, bits, value) {
const iterations = Math.ceil((bits >> 3) / 32);
const res = new Uint8Array(iterations * 32);
for (let iter = 0; iter < iterations; iter++) {
const buf = new Uint8Array(4 + secret.length + value.length);
buf.set(uint32be(iter + 1));
buf.set(secret, 4);
buf.set(value, 4 + secret.length);
res.set(await digest_default("sha256", buf), iter * 32);
}
return res.slice(0, bits >> 3);
}
async function deriveKey(publicKey, privateKey, algorithm, keyLength, apu = new Uint8Array(0), apv = new Uint8Array(0)) {
checkEncCryptoKey(publicKey, "ECDH");
checkEncCryptoKey(privateKey, "ECDH", "deriveBits");
const value = concat(
lengthAndInput(encoder.encode(algorithm)),
lengthAndInput(apu),
lengthAndInput(apv),
uint32be(keyLength)
);
let length;
if (publicKey.algorithm.name === "X25519") {
length = 256;
} else {
length = Math.ceil(parseInt(publicKey.algorithm.namedCurve.slice(-3), 10) / 8) << 3;
}
const sharedSecret = new Uint8Array(
await crypto.subtle.deriveBits(
{
name: publicKey.algorithm.name,
public: publicKey
},
privateKey,
length
)
);
return concatKdf(sharedSecret, keyLength, value);
}
function allowed(key) {
switch (key.algorithm.namedCurve) {
case "P-256":
case "P-384":
case "P-521":
return true;
default:
return key.algorithm.name === "X25519";
}
}
// src/lib/base64.ts
function decodeBase64(encoded) {
if (Uint8Array.fromBase64) {
return Uint8Array.fromBase64(encoded);
}
const binary = atob(encoded);
const bytes = new Uint8Array(binary.length);
for (let i = 0; i < binary.length; i++) {
bytes[i] = binary.charCodeAt(i);
}
return bytes;
}
// src/util/base64url.ts
function decode(input) {
if (Uint8Array.fromBase64) {
return Uint8Array.fromBase64(typeof input === "string" ? input : decoder.decode(input), {
alphabet: "base64url"
});
}
let encoded = input;
if (encoded instanceof Uint8Array) {
encoded = decoder.decode(encoded);
}
encoded = encoded.replace(/-/g, "+").replace(/_/g, "/").replace(/\s/g, "");
try {
return decodeBase64(encoded);
} catch {
throw new TypeError("The input to be decoded is not correctly encoded.");
}
}
// src/util/errors.ts
var JOSEError = class extends Error {
/**
* A unique error code for the particular error subclass.
*
* @ignore
*/
static code = "ERR_JOSE_GENERIC";
/** A unique error code for {@link JOSEError}. */
code = "ERR_JOSE_GENERIC";
/** @ignore */
constructor(message2, options) {
super(message2, options);
this.name = this.constructor.name;
Error.captureStackTrace?.(this, this.constructor);
}
};
var JOSENotSupported = class extends JOSEError {
/** @ignore */
static code = "ERR_JOSE_NOT_SUPPORTED";
/** A unique error code for {@link JOSENotSupported}. */
code = "ERR_JOSE_NOT_SUPPORTED";
};
var JWEDecryptionFailed = class extends JOSEError {
/** @ignore */
static code = "ERR_JWE_DECRYPTION_FAILED";
/** A unique error code for {@link JWEDecryptionFailed}. */
code = "ERR_JWE_DECRYPTION_FAILED";
/** @ignore */
constructor(message2 = "decryption operation failed", options) {
super(message2, options);
}
};
var JWEInvalid = class extends JOSEError {
/** @ignore */
static code = "ERR_JWE_INVALID";
/** A unique error code for {@link JWEInvalid}. */
code = "ERR_JWE_INVALID";
};
// src/lib/pbes2kw.ts
function getCryptoKey2(key, alg) {
if (key instanceof Uint8Array) {
return crypto.subtle.importKey("raw", key, "PBKDF2", false, ["deriveBits"]);
}
checkEncCryptoKey(key, alg, "deriveBits");
return key;
}
var concatSalt = (alg, p2sInput) => concat(encoder.encode(alg), new Uint8Array([0]), p2sInput);
async function deriveKey2(p2s, alg, p2c, key) {
if (!(p2s instanceof Uint8Array) || p2s.length < 8) {
throw new JWEInvalid("PBES2 Salt Input must be 8 or more octets");
}
const salt = concatSalt(alg, p2s);
const keylen = parseInt(alg.slice(13, 16), 10);
const subtleAlg = {
hash: `SHA-${alg.slice(8, 11)}`,
iterations: p2c,
name: "PBKDF2",
salt
};
const cryptoKey = await getCryptoKey2(key, alg);
return new Uint8Array(await crypto.subtle.deriveBits(subtleAlg, cryptoKey, keylen));
}
async function unwrap2(alg, key, encryptedKey, p2c, p2s) {
const derived = await deriveKey2(p2s, alg, p2c, key);
return unwrap(alg.slice(-6), derived, encryptedKey);
}
// src/lib/check_key_length.ts
var check_key_length_default = (alg, key) => {
if (alg.startsWith("RS") || alg.startsWith("PS")) {
const { modulusLength } = key.algorithm;
if (typeof modulusLength !== "number" || modulusLength < 2048) {
throw new TypeError(`${alg} requires key modulusLength to be 2048 bits or larger`);
}
}
};
// src/lib/rsaes.ts
var subtleAlgorithm = (alg) => {
switch (alg) {
case "RSA-OAEP":
case "RSA-OAEP-256":
case "RSA-OAEP-384":
case "RSA-OAEP-512":
return "RSA-OAEP";
default:
throw new JOSENotSupported(
`alg ${alg} is not supported either by JOSE or your javascript runtime`
);
}
};
async function decrypt(alg, key, encryptedKey) {
checkEncCryptoKey(key, alg, "decrypt");
check_key_length_default(alg, key);
return new Uint8Array(await crypto.subtle.decrypt(subtleAlgorithm(alg), key, encryptedKey));
}
// src/lib/cek.ts
function bitLength(alg) {
switch (alg) {
case "A128GCM":
return 128;
case "A192GCM":
return 192;
case "A256GCM":
case "A128CBC-HS256":
return 256;
case "A192CBC-HS384":
return 384;
case "A256CBC-HS512":
return 512;
default:
throw new JOSENotSupported(`Unsupported JWE Algorithm: ${alg}`);
}
}
// src/lib/invalid_key_input.ts
function message(msg, actual, ...types) {
types = types.filter(Boolean);
if (types.length > 2) {
const last = types.pop();
msg += `one of type ${types.join(", ")}, or ${last}.`;
} else if (types.length === 2) {
msg += `one of type ${types[0]} or ${types[1]}.`;
} else {
msg += `of type ${types[0]}.`;
}
if (actual == null) {
msg += ` Received ${actual}`;
} else if (typeof actual === "function" && actual.name) {
msg += ` Received function ${actual.name}`;
} else if (typeof actual === "object" && actual != null) {
if (actual.constructor?.name) {
msg += ` Received an instance of ${actual.constructor.name}`;
}
}
return msg;
}
var invalid_key_input_default = (actual, ...types) => {
return message("Key must be ", actual, ...types);
};
// src/lib/is_key_like.ts
function assertCryptoKey(key) {
if (!isCryptoKey(key)) {
throw new Error("CryptoKey instance expected");
}
}
function isCryptoKey(key) {
return key?.[Symbol.toStringTag] === "CryptoKey";
}
// src/lib/jwk_to_key.ts
function subtleMapping(jwk) {
let algorithm;
let keyUsages;
switch (jwk.kty) {
case "RSA": {
switch (jwk.alg) {
case "PS256":
case "PS384":
case "PS512":
algorithm = { name: "RSA-PSS", hash: `SHA-${jwk.alg.slice(-3)}` };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "RS256":
case "RS384":
case "RS512":
algorithm = { name: "RSASSA-PKCS1-v1_5", hash: `SHA-${jwk.alg.slice(-3)}` };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "RSA-OAEP":
case "RSA-OAEP-256":
case "RSA-OAEP-384":
case "RSA-OAEP-512":
algorithm = {
name: "RSA-OAEP",
hash: `SHA-${parseInt(jwk.alg.slice(-3), 10) || 1}`
};
keyUsages = jwk.d ? ["decrypt", "unwrapKey"] : ["encrypt", "wrapKey"];
break;
default:
throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
}
break;
}
case "EC": {
switch (jwk.alg) {
case "ES256":
algorithm = { name: "ECDSA", namedCurve: "P-256" };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "ES384":
algorithm = { name: "ECDSA", namedCurve: "P-384" };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "ES512":
algorithm = { name: "ECDSA", namedCurve: "P-521" };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "ECDH-ES":
case "ECDH-ES+A128KW":
case "ECDH-ES+A192KW":
case "ECDH-ES+A256KW":
algorithm = { name: "ECDH", namedCurve: jwk.crv };
keyUsages = jwk.d ? ["deriveBits"] : [];
break;
default:
throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
}
break;
}
case "OKP": {
switch (jwk.alg) {
case "Ed25519":
// Fall through
case "EdDSA":
algorithm = { name: "Ed25519" };
keyUsages = jwk.d ? ["sign"] : ["verify"];
break;
case "ECDH-ES":
case "ECDH-ES+A128KW":
case "ECDH-ES+A192KW":
case "ECDH-ES+A256KW":
algorithm = { name: jwk.crv };
keyUsages = jwk.d ? ["deriveBits"] : [];
break;
default:
throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
}
break;
}
default:
throw new JOSENotSupported('Invalid or unsupported JWK "kty" (Key Type) Parameter value');
}
return { algorithm, keyUsages };
}
var jwk_to_key_default = async (jwk) => {
if (!jwk.alg) {
throw new TypeError('"alg" argument is required when "jwk.alg" is not present');
}
const { algorithm, keyUsages } = subtleMapping(jwk);
const keyData = { ...jwk };
delete keyData.alg;
delete keyData.use;
return crypto.subtle.importKey(
"jwk",
keyData,
algorithm,
jwk.ext ?? (jwk.d ? false : true),
jwk.key_ops ?? keyUsages
);
};
// src/lib/is_object.ts
function isObjectLike(value) {
return typeof value === "object" && value !== null;
}
var is_object_default = (input) => {
if (!isObjectLike(input) || Object.prototype.toString.call(input) !== "[object Object]") {
return false;
}
if (Object.getPrototypeOf(input) === null) {
return true;
}
let proto = input;
while (Object.getPrototypeOf(proto) !== null) {
proto = Object.getPrototypeOf(proto);
}
return Object.getPrototypeOf(input) === proto;
};
// src/key/import.ts
async function importJWK(jwk, alg, options) {
if (!is_object_default(jwk)) {
throw new TypeError("JWK must be an object");
}
let ext;
alg ??= jwk.alg;
ext ??= options?.extractable ?? jwk.ext;
switch (jwk.kty) {
case "oct":
if (typeof jwk.k !== "string" || !jwk.k) {
throw new TypeError('missing "k" (Key Value) Parameter value');
}
return decode(jwk.k);
case "RSA":
if ("oth" in jwk && jwk.oth !== void 0) {
throw new JOSENotSupported(
'RSA JWK "oth" (Other Primes Info) Parameter value is not supported'
);
}
case "EC":
case "OKP":
return jwk_to_key_default({ ...jwk, alg, ext });
default:
throw new JOSENotSupported('Unsupported "kty" (Key Type) Parameter value');
}
}
// src/lib/iv.ts
function bitLength2(alg) {
switch (alg) {
case "A128GCM":
case "A128GCMKW":
case "A192GCM":
case "A192GCMKW":
case "A256GCM":
case "A256GCMKW":
return 96;
case "A128CBC-HS256":
case "A192CBC-HS384":
case "A256CBC-HS512":
return 128;
default:
throw new JOSENotSupported(`Unsupported JWE Algorithm: ${alg}`);
}
}
// src/lib/check_iv_length.ts
var check_iv_length_default = (enc, iv) => {
if (iv.length << 3 !== bitLength2(enc)) {
throw new JWEInvalid("Invalid Initialization Vector length");
}
};
// src/lib/check_cek_length.ts
var check_cek_length_default = (cek, expected) => {
const actual = cek.byteLength << 3;
if (actual !== expected) {
throw new JWEInvalid(
`Invalid Content Encryption Key length. Expected ${expected} bits, got ${actual} bits`
);
}
};
// src/lib/decrypt.ts
async function timingSafeEqual(a, b) {
if (!(a instanceof Uint8Array)) {
throw new TypeError("First argument must be a buffer");
}
if (!(b instanceof Uint8Array)) {
throw new TypeError("Second argument must be a buffer");
}
const algorithm = { name: "HMAC", hash: "SHA-256" };
const key = await crypto.subtle.generateKey(algorithm, false, ["sign"]);
const aHmac = new Uint8Array(await crypto.subtle.sign(algorithm, key, a));
const bHmac = new Uint8Array(await crypto.subtle.sign(algorithm, key, b));
let out = 0;
let i = -1;
while (++i < 32) {
out |= aHmac[i] ^ bHmac[i];
}
return out === 0;
}
async function cbcDecrypt(enc, cek, ciphertext, iv, tag, aad) {
if (!(cek instanceof Uint8Array)) {
throw new TypeError(invalid_key_input_default(cek, "Uint8Array"));
}
const keySize = parseInt(enc.slice(1, 4), 10);
const encKey = await crypto.subtle.importKey(
"raw",
cek.subarray(keySize >> 3),
"AES-CBC",
false,
["decrypt"]
);
const macKey = await crypto.subtle.importKey(
"raw",
cek.subarray(0, keySize >> 3),
{
hash: `SHA-${keySize << 1}`,
name: "HMAC"
},
false,
["sign"]
);
const macData = concat(aad, iv, ciphertext, uint64be(aad.length << 3));
const expectedTag = new Uint8Array(
(await crypto.subtle.sign("HMAC", macKey, macData)).slice(0, keySize >> 3)
);
let macCheckPassed;
try {
macCheckPassed = await timingSafeEqual(tag, expectedTag);
} catch {
}
if (!macCheckPassed) {
throw new JWEDecryptionFailed();
}
let plaintext;
try {
plaintext = new Uint8Array(
await crypto.subtle.decrypt({ iv, name: "AES-CBC" }, encKey, ciphertext)
);
} catch {
}
if (!plaintext) {
throw new JWEDecryptionFailed();
}
return plaintext;
}
async function gcmDecrypt(enc, cek, ciphertext, iv, tag, aad) {
let encKey;
if (cek instanceof Uint8Array) {
encKey = await crypto.subtle.importKey("raw", cek, "AES-GCM", false, ["decrypt"]);
} else {
checkEncCryptoKey(cek, enc, "decrypt");
encKey = cek;
}
try {
return new Uint8Array(
await crypto.subtle.decrypt(
{
additionalData: aad,
iv,
name: "AES-GCM",
tagLength: 128
},
encKey,
concat(ciphertext, tag)
)
);
} catch {
throw new JWEDecryptionFailed();
}
}
var decrypt_default = async (enc, cek, ciphertext, iv, tag, aad) => {
if (!isCryptoKey(cek) && !(cek instanceof Uint8Array)) {
throw new TypeError(
invalid_key_input_default(cek, "CryptoKey", "KeyObject", "Uint8Array", "JSON Web Key")
);
}
if (!iv) {
throw new JWEInvalid("JWE Initialization Vector missing");
}
if (!tag) {
throw new JWEInvalid("JWE Authentication Tag missing");
}
check_iv_length_default(enc, iv);
switch (enc) {
case "A128CBC-HS256":
case "A192CBC-HS384":
case "A256CBC-HS512":
if (cek instanceof Uint8Array) check_cek_length_default(cek, parseInt(enc.slice(-3), 10));
return cbcDecrypt(enc, cek, ciphertext, iv, tag, aad);
case "A128GCM":
case "A192GCM":
case "A256GCM":
if (cek instanceof Uint8Array) check_cek_length_default(cek, parseInt(enc.slice(1, 4), 10));
return gcmDecrypt(enc, cek, ciphertext, iv, tag, aad);
default:
throw new JOSENotSupported("Unsupported JWE Content Encryption Algorithm");
}
};
// src/lib/aesgcmkw.ts
async function unwrap3(alg, key, encryptedKey, iv, tag) {
const jweAlgorithm = alg.slice(0, 7);
return decrypt_default(jweAlgorithm, key, encryptedKey, iv, tag, new Uint8Array(0));
}
// src/lib/decrypt_key_management.ts
var decrypt_key_management_default = async (alg, key, encryptedKey, joseHeader, options) => {
switch (alg) {
case "dir": {
if (encryptedKey !== void 0)
throw new JWEInvalid("Encountered unexpected JWE Encrypted Key");
return key;
}
case "ECDH-ES":
if (encryptedKey !== void 0)
throw new JWEInvalid("Encountered unexpected JWE Encrypted Key");
case "ECDH-ES+A128KW":
case "ECDH-ES+A192KW":
case "ECDH-ES+A256KW": {
if (!is_object_default(joseHeader.epk))
throw new JWEInvalid(`JOSE Header "epk" (Ephemeral Public Key) missing or invalid`);
assertCryptoKey(key);
if (!allowed(key))
throw new JOSENotSupported(
"ECDH with the provided key is not allowed or not supported by your javascript runtime"
);
const epk = await importJWK(joseHeader.epk, alg);
assertCryptoKey(epk);
let partyUInfo;
let partyVInfo;
if (joseHeader.apu !== void 0) {
if (typeof joseHeader.apu !== "string")
throw new JWEInvalid(`JOSE Header "apu" (Agreement PartyUInfo) invalid`);
try {
partyUInfo = decode(joseHeader.apu);
} catch {
throw new JWEInvalid("Failed to base64url decode the apu");
}
}
if (joseHeader.apv !== void 0) {
if (typeof joseHeader.apv !== "string")
throw new JWEInvalid(`JOSE Header "apv" (Agreement PartyVInfo) invalid`);
try {
partyVInfo = decode(joseHeader.apv);
} catch {
throw new JWEInvalid("Failed to base64url decode the apv");
}
}
const sharedSecret = await deriveKey(
epk,
key,
alg === "ECDH-ES" ? joseHeader.enc : alg,
alg === "ECDH-ES" ? bitLength(joseHeader.enc) : parseInt(alg.slice(-5, -2), 10),
partyUInfo,
partyVInfo
);
if (alg === "ECDH-ES") return sharedSecret;
if (encryptedKey === void 0) throw new JWEInvalid("JWE Encrypted Key missing");
return unwrap(alg.slice(-6), sharedSecret, encryptedKey);
}
case "RSA-OAEP":
case "RSA-OAEP-256":
case "RSA-OAEP-384":
case "RSA-OAEP-512": {
if (encryptedKey === void 0) throw new JWEInvalid("JWE Encrypted Key missing");
assertCryptoKey(key);
return decrypt(alg, key, encryptedKey);
}
case "PBES2-HS256+A128KW":
case "PBES2-HS384+A192KW":
case "PBES2-HS512+A256KW": {
if (encryptedKey === void 0) throw new JWEInvalid("JWE Encrypted Key missing");
if (typeof joseHeader.p2c !== "number")
throw new JWEInvalid(`JOSE Header "p2c" (PBES2 Count) missing or invalid`);
const p2cLimit = options?.maxPBES2Count || 1e4;
if (joseHeader.p2c > p2cLimit)
throw new JWEInvalid(`JOSE Header "p2c" (PBES2 Count) out is of acceptable bounds`);
if (typeof joseHeader.p2s !== "string")
throw new JWEInvalid(`JOSE Header "p2s" (PBES2 Salt) missing or invalid`);
let p2s;
try {
p2s = decode(joseHeader.p2s);
} catch {
throw new JWEInvalid("Failed to base64url decode the p2s");
}
return unwrap2(alg, key, encryptedKey, joseHeader.p2c, p2s);
}
case "A128KW":
case "A192KW":
case "A256KW": {
if (encryptedKey === void 0) throw new JWEInvalid("JWE Encrypted Key missing");
return unwrap(alg, key, encryptedKey);
}
case "A128GCMKW":
case "A192GCMKW":
case "A256GCMKW": {
if (encryptedKey === void 0) throw new JWEInvalid("JWE Encrypted Key missing");
if (typeof joseHeader.iv !== "string")
throw new JWEInvalid(`JOSE Header "iv" (Initialization Vector) missing or invalid`);
if (typeof joseHeader.tag !== "string")
throw new JWEInvalid(`JOSE Header "tag" (Authentication Tag) missing or invalid`);
let iv;
try {
iv = decode(joseHeader.iv);
} catch {
throw new JWEInvalid("Failed to base64url decode the iv");
}
let tag;
try {
tag = decode(joseHeader.tag);
} catch {
throw new JWEInvalid("Failed to base64url decode the tag");
}
return unwrap3(alg, key, encryptedKey, iv, tag);
}
default: {
throw new JOSENotSupported('Invalid or unsupported "alg" (JWE Algorithm) header value');
}
}
};