-
Notifications
You must be signed in to change notification settings - Fork 93
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
aes: switch from native async to noble sync
- Loading branch information
Showing
5 changed files
with
47 additions
and
112 deletions.
There are no files selected for viewing
Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,124 +1,47 @@ | ||
| import { crypto as cr } from "@noble/hashes/crypto"; | ||
| import { concatBytes, equalsBytes } from "./utils.js"; | ||
| import { ctr, cbc } from "@noble/ciphers/aes"; | ||
| import type { CipherWithOutput } from "@noble/ciphers/utils"; | ||
|
|
||
| const crypto: any = { web: cr }; | ||
|
|
||
| function validateOpt(key: Uint8Array, iv: Uint8Array, mode: string) { | ||
| function getCipher( | ||
| key: Uint8Array, | ||
| iv: Uint8Array, | ||
| mode: string, | ||
| pkcs7PaddingEnabled = true | ||
| ): CipherWithOutput { | ||
| if (!mode.startsWith("aes-")) { | ||
| throw new Error(`AES submodule doesn't support mode ${mode}`); | ||
| } | ||
| if (iv.length !== 16) { | ||
| throw new Error("AES: wrong IV length"); | ||
| throw new Error("AES: unsupported mode"); | ||
| } | ||
| if ( | ||
| (mode.startsWith("aes-128") && key.length !== 16) || | ||
| (mode.startsWith("aes-256") && key.length !== 32) | ||
| ) { | ||
| const len = key.length; | ||
| if ((mode.startsWith("aes-128") && len !== 16) || (mode.startsWith("aes-256") && len !== 32)) { | ||
| throw new Error("AES: wrong key length"); | ||
| } | ||
| } | ||
|
|
||
| async function getBrowserKey( | ||
| mode: string, | ||
| key: Uint8Array, | ||
| iv: Uint8Array | ||
| ): Promise<[CryptoKey, AesCbcParams | AesCtrParams]> { | ||
| if (!crypto.web) { | ||
| throw new Error("Browser crypto not available."); | ||
| if (iv.length !== 16) { | ||
| throw new Error("AES: wrong IV length"); | ||
| } | ||
| let keyMode: string | undefined; | ||
| if (["aes-128-cbc", "aes-256-cbc"].includes(mode)) { | ||
| keyMode = "cbc"; | ||
| return cbc(key, iv, { disablePadding: !pkcs7PaddingEnabled }); | ||
| } | ||
| if (["aes-128-ctr", "aes-256-ctr"].includes(mode)) { | ||
| keyMode = "ctr"; | ||
| return ctr(key, iv); | ||
| } | ||
| if (!keyMode) { | ||
| throw new Error("AES: unsupported mode"); | ||
| } | ||
| const wKey = await crypto.web.subtle.importKey( | ||
| "raw", | ||
| key, | ||
| { name: `AES-${keyMode.toUpperCase()}`, length: key.length * 8 }, | ||
| true, | ||
| ["encrypt", "decrypt"] | ||
| ); | ||
| // node.js uses whole 128 bit as a counter, without nonce, instead of 64 bit | ||
| // recommended by NIST SP800-38A | ||
| return [wKey, { name: `aes-${keyMode}`, iv, counter: iv, length: 128 }]; | ||
| throw new Error("AES: unsupported mode"); | ||
| } | ||
|
|
||
| export async function encrypt( | ||
| export function encrypt( | ||
| msg: Uint8Array, | ||
| key: Uint8Array, | ||
| iv: Uint8Array, | ||
| mode = "aes-128-ctr", | ||
| pkcs7PaddingEnabled = true | ||
| ): Promise<Uint8Array> { | ||
| validateOpt(key, iv, mode); | ||
| if (crypto.web) { | ||
| const [wKey, wOpt] = await getBrowserKey(mode, key, iv); | ||
| const cipher = await crypto.web.subtle.encrypt(wOpt, wKey, msg); | ||
| // Remove PKCS7 padding on cbc mode by stripping end of message | ||
| let res = new Uint8Array(cipher); | ||
| if (!pkcs7PaddingEnabled && wOpt.name === "aes-cbc" && !(msg.length % 16)) { | ||
| res = res.slice(0, -16); | ||
| } | ||
| return res; | ||
| } else if (crypto.node) { | ||
| const cipher = crypto.node.createCipheriv(mode, key, iv); | ||
| cipher.setAutoPadding(pkcs7PaddingEnabled); | ||
| return concatBytes(cipher.update(msg), cipher.final()); | ||
| } else { | ||
| throw new Error("The environment doesn't have AES module"); | ||
| } | ||
| ): Uint8Array { | ||
| return getCipher(key, iv, mode, pkcs7PaddingEnabled).encrypt(msg); | ||
| } | ||
|
|
||
| async function getPadding( | ||
| cypherText: Uint8Array, | ||
| key: Uint8Array, | ||
| iv: Uint8Array, | ||
| mode: string | ||
| ) { | ||
| const lastBlock = cypherText.slice(-16); | ||
| for (let i = 0; i < 16; i++) { | ||
| // Undo xor of iv and fill with lastBlock ^ padding (16) | ||
| lastBlock[i] ^= iv[i] ^ 16; | ||
| } | ||
| const res = await encrypt(lastBlock, key, iv, mode); | ||
| return res.slice(0, 16); | ||
| } | ||
|
|
||
| export async function decrypt( | ||
| cypherText: Uint8Array, | ||
| export function decrypt( | ||
| ciphertext: Uint8Array, | ||
| key: Uint8Array, | ||
| iv: Uint8Array, | ||
| mode = "aes-128-ctr", | ||
| pkcs7PaddingEnabled = true | ||
| ): Promise<Uint8Array> { | ||
| validateOpt(key, iv, mode); | ||
| if (crypto.web) { | ||
| const [wKey, wOpt] = await getBrowserKey(mode, key, iv); | ||
| // Add empty padding so Chrome will correctly decrypt message | ||
| if (!pkcs7PaddingEnabled && wOpt.name === "aes-cbc") { | ||
| const padding = await getPadding(cypherText, key, iv, mode); | ||
| cypherText = concatBytes(cypherText, padding); | ||
| } | ||
| const msg = await crypto.web.subtle.decrypt(wOpt, wKey, cypherText); | ||
| const msgBytes = new Uint8Array(msg); | ||
| // Safari always ignores padding (if no padding -> broken message) | ||
| if (wOpt.name === "aes-cbc") { | ||
| const encrypted = await encrypt(msgBytes, key, iv, mode); | ||
| if (!equalsBytes(encrypted, cypherText)) { | ||
| throw new Error("AES: wrong padding"); | ||
| } | ||
| } | ||
| return msgBytes; | ||
| } else if (crypto.node) { | ||
| const decipher = crypto.node.createDecipheriv(mode, key, iv); | ||
| decipher.setAutoPadding(pkcs7PaddingEnabled); | ||
| return concatBytes(decipher.update(cypherText), decipher.final()); | ||
| } else { | ||
| throw new Error("The environment doesn't have AES module"); | ||
| } | ||
| ): Uint8Array { | ||
| return getCipher(key, iv, mode, pkcs7PaddingEnabled).decrypt(ciphertext); | ||
| } |
Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters