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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | 1x 1x 1x 5x 5x 5x 1x 1x 3x 3x 3x 3x 3x 3x 1x 2x 2x 2x 2x 2x 2x 2x 1x 5x 5x 5x 5x 1x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 1x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x | import {
createCipheriv,
createDecipheriv,
randomBytes,
scryptSync,
} from "crypto";
import { SecretString } from "./Secret";
const ALGORITHM = "aes-256-cbc";
const DELIMITER = "#";
function makeKey(password: SecretString, salt: Buffer): Buffer {
return scryptSync(password.value(), salt, 32);
}
export class EncryptedValue {
cipherText: string;
iv: Buffer;
salt: Buffer;
static makeFromPlainText(
plainText: string,
password: SecretString
): EncryptedValue {
const { cipherText, iv, salt } = encrypt(plainText, password);
return new EncryptedValue(cipherText, iv, salt);
}
static makeFromSerializedText(serializedText: string): EncryptedValue {
const splited = serializedText.split(DELIMITER);
if (splited.length != 3) {
throw new Error(
`invalid serializedText, splited length is not 3, original:${serializedText}, splited:${splited}`
);
}
const iv = Buffer.from(splited[0] || "", "hex");
const salt = Buffer.from(splited[1] || "", "hex");
const cipherText = splited[2] || "";
return new EncryptedValue(cipherText, iv, salt);
}
constructor(cipherText: string, iv: Buffer, salt: Buffer) {
this.cipherText = cipherText;
this.iv = iv;
this.salt = salt;
}
serialize(): string {
return (
this.iv.toString("hex") +
DELIMITER +
this.salt.toString("hex") +
DELIMITER +
this.cipherText
);
}
decrypt(password: SecretString): SecretString {
return decrypt(this.cipherText, password, this.salt, this.iv);
}
}
function encrypt(
plainText: string,
password: SecretString
): {
cipherText: string;
iv: Buffer;
salt: Buffer;
} {
const iv = randomBytes(16);
const salt = randomBytes(16);
const key = makeKey(password, salt);
const cipher = createCipheriv(ALGORITHM, key, iv);
let cipherText = cipher.update(plainText, "utf8", "hex");
cipherText += cipher.final("hex");
return {
cipherText,
iv,
salt,
};
}
function decrypt(
cipherText: string,
password: SecretString,
salt: Buffer,
iv: Buffer
): SecretString {
const key = makeKey(password, salt);
const decipher = createDecipheriv(ALGORITHM, key, iv);
let plainText = decipher.update(cipherText, "hex", "utf8");
plainText += decipher.final("utf8");
return new SecretString(plainText);
}
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