75 lines
3.2 KiB
JavaScript
75 lines
3.2 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const crypto_1 = require("crypto");
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const check_iv_length_js_1 = require("../lib/check_iv_length.js");
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const check_cek_length_js_1 = require("./check_cek_length.js");
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const buffer_utils_js_1 = require("../lib/buffer_utils.js");
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const cbc_tag_js_1 = require("./cbc_tag.js");
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const webcrypto_js_1 = require("./webcrypto.js");
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const crypto_key_js_1 = require("../lib/crypto_key.js");
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const is_key_object_js_1 = require("./is_key_object.js");
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const invalid_key_input_js_1 = require("../lib/invalid_key_input.js");
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const errors_js_1 = require("../util/errors.js");
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const ciphers_js_1 = require("./ciphers.js");
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const is_key_like_js_1 = require("./is_key_like.js");
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function cbcEncrypt(enc, plaintext, cek, iv, aad) {
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const keySize = parseInt(enc.slice(1, 4), 10);
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if ((0, is_key_object_js_1.default)(cek)) {
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cek = cek.export();
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}
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const encKey = cek.subarray(keySize >> 3);
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const macKey = cek.subarray(0, keySize >> 3);
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const algorithm = `aes-${keySize}-cbc`;
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if (!(0, ciphers_js_1.default)(algorithm)) {
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throw new errors_js_1.JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
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}
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const cipher = (0, crypto_1.createCipheriv)(algorithm, encKey, iv);
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const ciphertext = (0, buffer_utils_js_1.concat)(cipher.update(plaintext), cipher.final());
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const macSize = parseInt(enc.slice(-3), 10);
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const tag = (0, cbc_tag_js_1.default)(aad, iv, ciphertext, macSize, macKey, keySize);
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return { ciphertext, tag };
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}
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function gcmEncrypt(enc, plaintext, cek, iv, aad) {
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const keySize = parseInt(enc.slice(1, 4), 10);
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const algorithm = `aes-${keySize}-gcm`;
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if (!(0, ciphers_js_1.default)(algorithm)) {
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throw new errors_js_1.JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
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}
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const cipher = (0, crypto_1.createCipheriv)(algorithm, cek, iv, { authTagLength: 16 });
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if (aad.byteLength) {
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cipher.setAAD(aad, { plaintextLength: plaintext.length });
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}
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const ciphertext = cipher.update(plaintext);
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cipher.final();
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const tag = cipher.getAuthTag();
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return { ciphertext, tag };
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}
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const encrypt = (enc, plaintext, cek, iv, aad) => {
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let key;
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if ((0, webcrypto_js_1.isCryptoKey)(cek)) {
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(0, crypto_key_js_1.checkEncCryptoKey)(cek, enc, 'encrypt');
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key = crypto_1.KeyObject.from(cek);
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}
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else if (cek instanceof Uint8Array || (0, is_key_object_js_1.default)(cek)) {
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key = cek;
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}
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else {
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throw new TypeError((0, invalid_key_input_js_1.default)(cek, ...is_key_like_js_1.types, 'Uint8Array'));
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}
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(0, check_cek_length_js_1.default)(enc, key);
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(0, check_iv_length_js_1.default)(enc, iv);
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switch (enc) {
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case 'A128CBC-HS256':
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case 'A192CBC-HS384':
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case 'A256CBC-HS512':
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return cbcEncrypt(enc, plaintext, key, iv, aad);
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case 'A128GCM':
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case 'A192GCM':
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case 'A256GCM':
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return gcmEncrypt(enc, plaintext, key, iv, aad);
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default:
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throw new errors_js_1.JOSENotSupported('Unsupported JWE Content Encryption Algorithm');
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}
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};
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exports.default = encrypt;
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