How to use the browserify-cipher.createCipheriv function in browserify-cipher

export function encryptAES128CTR(string, password, hex=false) {
    const string_buffer = new Buffer(string, hex?'hex':undefined) // ethereum: new Buffer(string,'hex')
    const ciphertype = 'aes-128-ctr'
    const salt = randomBytes(32)
    const iv = randomBytes(16)
    const kdf = 'scrypt'
    const kdfparams = {
        dklen: 32,
        salt: salt.toString('hex'),
        n: 1024,
        r: 8,
        p: 1,
    }

    const derivedKey = scrypt(new Buffer(password), salt, kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen)
    const cipher = createCipheriv(ciphertype, derivedKey.slice(0, 16), iv)
    if (!cipher)
        throw new Error('Unsupported cipher')

    return {
        ciphertext: Buffer.concat([cipher.update(string_buffer), cipher.final()]).toString('hex'),
        cipherparams: {
            iv: iv.toString('hex')
        },
        cipher: ciphertype,
        kdf: kdf,
        kdfparams: kdfparams
    }
}

kdfparams.n = options.n || 8192; // 2048 4096 8192 16384
            kdfparams.r = options.r || 8;
            kdfparams.p = options.p || 1;
            derivedKey = scrypt(
                Buffer.from(password),
                Buffer.from(kdfparams.salt, 'hex'),
                kdfparams.n,
                kdfparams.r,
                kdfparams.p,
                kdfparams.dklen
            );
        } else {
            throw new Error('Unsupported kdf');
        }

        const cipher = createCipheriv(options.cipher || 'aes-128-ctr', derivedKey.slice(0, 16), iv);
        if (!cipher) {
            throw new Error('Unsupported cipher');
        }

        const ciphertext = Buffer.concat([
            cipher.update(Buffer.from(this.privateKey.replace('0x', ''), 'hex')),
            cipher.final()
        ]);

        const mac = keccak256(Buffer.concat([derivedKey.slice(16, 32), Buffer.from(ciphertext, 'hex')])).replace(
            '0x',
            ''
        );

        return {
            version: 3,

salt: salt.toString('hex')
    }
    if (kdf === 'pbkdf2') {
        kdfparams.c = opts.c || 262144
        kdfparams.prf = 'hmac-sha256'
        derivedKey = pbkdf2.pbkdf2Sync(new Buffer(password), salt, kdfparams.c, kdfparams.dklen, 'sha256')
    } else if (kdf === 'scrypt') {
        // FIXME: support progress reporting callback
        kdfparams.n = opts.n || 1024
        kdfparams.r = opts.r || 8
        kdfparams.p = opts.p || 1
        derivedKey = scrypt(new Buffer(password), salt, kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen)
    } else {
        throw new Error('Unsupported kdf')
    }
    var cipher = createCipheriv(opts.cipher || 'aes-128-ctr', derivedKey.slice(0, 16), iv)
    if (!cipher) {
        throw new Error('Unsupported cipher')
    }
    var ciphertext = Buffer.concat([cipher.update(value), cipher.final()])
    return {
        ciphertext: ciphertext.toString('hex'),
        cipherparams: {
            iv: iv.toString('hex')
        },
        cipher: opts.cipher || 'aes-128-ctr',
        kdf: kdf,
        kdfparams: kdfparams
    }
}
function decipherBuffer(decipher, data) {

kdfparams.n = options.n || 8192; // 2048 4096 8192 16384
            kdfparams.r = options.r || 8;
            kdfparams.p = options.p || 1;
            derivedKey = scrypt(
                Buffer.from(password),
                Buffer.from(kdfparams.salt, 'hex'),
                kdfparams.n,
                kdfparams.r,
                kdfparams.p,
                kdfparams.dklen
            );
        } else {
            throw new Error('Unsupported kdf');
        }

        const cipher = createCipheriv(options.cipher || 'aes-128-ctr', derivedKey.slice(0, 16), iv);
        if (!cipher) {
            throw new Error('Unsupported cipher');
        }

        const ciphertext = Buffer.concat([
            cipher.update(Buffer.from(this.privateKey.replace('0x', ''), 'hex')),
            cipher.final()
        ]);

        const mac = keccak256(Buffer.concat([derivedKey.slice(16, 32), Buffer.from(ciphertext, 'hex')])).replace(
            '0x',
            ''
        );

        return {
            version: 3,