import { Buffer } from "../../buffer.ts";import { createHash } from "../hash.ts";
export function EVP_BytesToKey( password: string | Buffer, salt: string | Buffer, keyBits: number, ivLen: number,) { if (!Buffer.isBuffer(password)) password = Buffer.from(password, "binary"); if (salt) { if (!Buffer.isBuffer(salt)) salt = Buffer.from(salt, "binary"); if (salt.length !== 8) { throw new RangeError("salt should be Buffer with 8 byte length"); } }
let keyLen = keyBits / 8; const key = Buffer.alloc(keyLen); const iv = Buffer.alloc(ivLen || 0); let tmp = Buffer.alloc(0);
while (keyLen > 0 || ivLen > 0) { const hash = createHash("md5"); hash.update(tmp); hash.update(password); if (salt) hash.update(salt); tmp = hash.digest() as Buffer;
let used = 0;
if (keyLen > 0) { const keyStart = key.length - keyLen; used = Math.min(keyLen, tmp.length); tmp.copy(key, keyStart, 0, used); keyLen -= used; }
if (used < tmp.length && ivLen > 0) { const ivStart = iv.length - ivLen; const length = Math.min(ivLen, tmp.length - used); tmp.copy(iv, ivStart, used, used + length); ivLen -= length; } }
tmp.fill(0); return { key, iv };}
export default EVP_BytesToKey;