// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
// SPDX-License-Identifier: Apache-2.0

#include <assert.h>
#include <string.h>

#include <openssl/cipher.h>
#include <openssl/nid.h>
#include <openssl/rc4.h>

#include "../fipsmodule/cipher/internal.h"


static int rc4_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
                        const uint8_t *iv, int enc) {
  RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data;

  RC4_set_key(rc4key, EVP_CIPHER_CTX_key_length(ctx), key);
  return 1;
}

static int rc4_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
                      size_t in_len) {
  RC4_KEY *rc4key = (RC4_KEY *)ctx->cipher_data;

  RC4(rc4key, in_len, in, out);
  return 1;
}

static const EVP_CIPHER rc4 = {
    .nid = NID_rc4,
    .block_size = 1,
    .key_len = 16,
    .iv_len = 0,
    .ctx_size = sizeof(RC4_KEY),
    .flags = EVP_CIPH_VARIABLE_LENGTH,
    .init = rc4_init_key,
    .cipher = rc4_cipher,
};

const EVP_CIPHER *EVP_rc4(void) { return &rc4; }