/*

 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_RC4

# include <openssl/evp.h>

# include <openssl/objects.h>

# include <openssl/rc4.h>

# include "internal/evp_int.h"

typedef struct {

    RC4_KEY ks;                 /* working key */

} EVP_RC4_KEY;

# define data(ctx) ((EVP_RC4_KEY *)EVP_CIPHER_CTX_get_cipher_data(ctx))

static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc);

static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                      const unsigned char *in, size_t inl);

static const EVP_CIPHER r4_cipher = {

    NID_rc4,

    1, EVP_RC4_KEY_SIZE, 0,

    EVP_CIPH_VARIABLE_LENGTH,

    rc4_init_key,

    rc4_cipher,

    NULL,

    sizeof(EVP_RC4_KEY),

    NULL,

    NULL,

    NULL,

    NULL

};

static const EVP_CIPHER r4_40_cipher = {

    NID_rc4_40,

    1, 5 /* 40 bit */ , 0,

    EVP_CIPH_VARIABLE_LENGTH,

    rc4_init_key,

    rc4_cipher,

    NULL,

    sizeof(EVP_RC4_KEY),

    NULL,

    NULL,

    NULL,

    NULL

};

const EVP_CIPHER *EVP_rc4(void)

{

    return &r4_cipher;

}

const EVP_CIPHER *EVP_rc4_40(void)

{

    return &r4_40_cipher;

}

static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc)

{

    RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);

    return 1;

}

static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,

                      const unsigned char *in, size_t inl)

{

    RC4(&data(ctx)->ks, inl, in, out);

    return 1;

}

#endif