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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright 2017 crypto-browserify. All rights reserved. MIT license.
import { Buffer } from "../../buffer.ts";import { createHash } from "../../internal/crypto/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;