/*

 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/*

 * RC5 low level APIs are deprecated for public use, but still ok for internal

 * use.

 */

#include "internal/deprecated.h"

#include <stdio.h>

#include "internal/cryptlib.h"

#ifndef OPENSSL_NO_RC5

# include <openssl/evp.h>

# include "crypto/evp.h"

# include <openssl/objects.h>

# include "evp_local.h"

# include <openssl/rc5.h>

static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                               const unsigned char *iv, int enc);

static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct {

    int rounds;                 /* number of rounds */

    RC5_32_KEY ks;              /* key schedule */

} EVP_RC5_KEY;

# define data(ctx)       EVP_C_DATA(EVP_RC5_KEY,ctx)

IMPLEMENT_BLOCK_CIPHER(rc5_32_12_16, ks, RC5_32, EVP_RC5_KEY, NID_rc5,

                       8, RC5_32_KEY_LENGTH, 8, 64,

                       EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

                       r_32_12_16_init_key, NULL, NULL, NULL, rc5_ctrl)

static int rc5_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

{

    switch (type) {

    case EVP_CTRL_INIT:

        data(c)->rounds = RC5_12_ROUNDS;

        return 1;

    case EVP_CTRL_GET_RC5_ROUNDS:

        *(int *)ptr = data(c)->rounds;

        return 1;

    case EVP_CTRL_SET_RC5_ROUNDS:

        switch (arg) {

        case RC5_8_ROUNDS:

        case RC5_12_ROUNDS:

        case RC5_16_ROUNDS:

            data(c)->rounds = arg;

            return 1;

        default:

            ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_NUMBER_OF_ROUNDS);

            return 0;

        }

    default:

        return -1;

    }

}

static int r_32_12_16_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                               const unsigned char *iv, int enc)

{

    const int key_len = EVP_CIPHER_CTX_get_key_length(ctx);

    if (key_len > 255 || key_len < 0) {

        ERR_raise(ERR_LIB_EVP, EVP_R_BAD_KEY_LENGTH);

        return 0;

    }

    return RC5_32_set_key(&data(ctx)->ks, key_len, key, data(ctx)->rounds);

}

#endif