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server/node_modules/jose/dist/node/esm/runtime/encrypt.js

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+import { createCipheriv, KeyObject } from 'crypto';
+import checkIvLength from '../lib/check_iv_length.js';
+import checkCekLength from './check_cek_length.js';
+import { concat } from '../lib/buffer_utils.js';
+import cbcTag from './cbc_tag.js';
+import { isCryptoKey } from './webcrypto.js';
+import { checkEncCryptoKey } from '../lib/crypto_key.js';
+import isKeyObject from './is_key_object.js';
+import invalidKeyInput from '../lib/invalid_key_input.js';
+import { JOSENotSupported } from '../util/errors.js';
+import supported from './ciphers.js';
+import { types } from './is_key_like.js';
+function cbcEncrypt(enc, plaintext, cek, iv, aad) {
+    const keySize = parseInt(enc.slice(1, 4), 10);
+    if (isKeyObject(cek)) {
+        cek = cek.export();
+    }
+    const encKey = cek.subarray(keySize >> 3);
+    const macKey = cek.subarray(0, keySize >> 3);
+    const algorithm = `aes-${keySize}-cbc`;
+    if (!supported(algorithm)) {
+        throw new JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
+    }
+    const cipher = createCipheriv(algorithm, encKey, iv);
+    const ciphertext = concat(cipher.update(plaintext), cipher.final());
+    const macSize = parseInt(enc.slice(-3), 10);
+    const tag = cbcTag(aad, iv, ciphertext, macSize, macKey, keySize);
+    return { ciphertext, tag };
+}
+function gcmEncrypt(enc, plaintext, cek, iv, aad) {
+    const keySize = parseInt(enc.slice(1, 4), 10);
+    const algorithm = `aes-${keySize}-gcm`;
+    if (!supported(algorithm)) {
+        throw new JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
+    }
+    const cipher = createCipheriv(algorithm, cek, iv, { authTagLength: 16 });
+    if (aad.byteLength) {
+        cipher.setAAD(aad, { plaintextLength: plaintext.length });
+    }
+    const ciphertext = cipher.update(plaintext);
+    cipher.final();
+    const tag = cipher.getAuthTag();
+    return { ciphertext, tag };
+}
+const encrypt = (enc, plaintext, cek, iv, aad) => {
+    let key;
+    if (isCryptoKey(cek)) {
+        checkEncCryptoKey(cek, enc, 'encrypt');
+        key = KeyObject.from(cek);
+    }
+    else if (cek instanceof Uint8Array || isKeyObject(cek)) {
+        key = cek;
+    }
+    else {
+        throw new TypeError(invalidKeyInput(cek, ...types, 'Uint8Array'));
+    }
+    checkCekLength(enc, key);
+    checkIvLength(enc, iv);
+    switch (enc) {
+        case 'A128CBC-HS256':
+        case 'A192CBC-HS384':
+        case 'A256CBC-HS512':
+            return cbcEncrypt(enc, plaintext, key, iv, aad);
+        case 'A128GCM':
+        case 'A192GCM':
+        case 'A256GCM':
+            return gcmEncrypt(enc, plaintext, key, iv, aad);
+        default:
+            throw new JOSENotSupported('Unsupported JWE Content Encryption Algorithm');
+    }
+};
+export default encrypt;