/*

 * Copyright 1995-2018 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_RC2

# include <openssl/evp.h>

# include <openssl/objects.h>

# include "crypto/evp.h"

# include <openssl/rc2.h>

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc);

static int rc2_meth_to_magic(EVP_CIPHER_CTX *ctx);

static int rc2_magic_to_meth(int i);

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type);

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr);

typedef struct {

    int key_bits;               /* effective key bits */

    RC2_KEY ks;                 /* key schedule */

} EVP_RC2_KEY;

# define data(ctx)       EVP_C_DATA(EVP_RC2_KEY,ctx)

IMPLEMENT_BLOCK_CIPHER(rc2, ks, RC2, EVP_RC2_KEY, NID_rc2,

                       8,

                       RC2_KEY_LENGTH, 8, 64,

                       EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

                       rc2_init_key, NULL,

                       rc2_set_asn1_type_and_iv, rc2_get_asn1_type_and_iv,

                       rc2_ctrl)

# define RC2_40_MAGIC    0xa0

# define RC2_64_MAGIC    0x78

# define RC2_128_MAGIC   0x3a

static const EVP_CIPHER r2_64_cbc_cipher = {

    NID_rc2_64_cbc,

    8, 8 /* 64 bit */ , 8,

    EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

    rc2_init_key,

    rc2_cbc_cipher,

    NULL,

    sizeof(EVP_RC2_KEY),

    rc2_set_asn1_type_and_iv,

    rc2_get_asn1_type_and_iv,

    rc2_ctrl,

    NULL

};

static const EVP_CIPHER r2_40_cbc_cipher = {

    NID_rc2_40_cbc,

    8, 5 /* 40 bit */ , 8,

    EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,

    rc2_init_key,

    rc2_cbc_cipher,

    NULL,

    sizeof(EVP_RC2_KEY),

    rc2_set_asn1_type_and_iv,

    rc2_get_asn1_type_and_iv,

    rc2_ctrl,

    NULL

};

const EVP_CIPHER *EVP_rc2_64_cbc(void)

{

    return &r2_64_cbc_cipher;

}

const EVP_CIPHER *EVP_rc2_40_cbc(void)

{

    return &r2_40_cbc_cipher;

}

static int rc2_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,

                        const unsigned char *iv, int enc)

{

    RC2_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),

                key, data(ctx)->key_bits);

    return 1;

}

static int rc2_meth_to_magic(EVP_CIPHER_CTX *e)

{

    int i;

    if (EVP_CIPHER_CTX_ctrl(e, EVP_CTRL_GET_RC2_KEY_BITS, 0, &i) <= 0)

        return 0;

    if (i == 128)

        return RC2_128_MAGIC;

    else if (i == 64)

        return RC2_64_MAGIC;

    else if (i == 40)

        return RC2_40_MAGIC;

    else

        return 0;

}

static int rc2_magic_to_meth(int i)

{

    if (i == RC2_128_MAGIC)

        return 128;

    else if (i == RC2_64_MAGIC)

        return 64;

    else if (i == RC2_40_MAGIC)

        return 40;

    else {

        EVPerr(EVP_F_RC2_MAGIC_TO_METH, EVP_R_UNSUPPORTED_KEY_SIZE);

        return 0;

    }

}

static int rc2_get_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    long num = 0;

    int i = 0;

    int key_bits;

    unsigned int l;

    unsigned char iv[EVP_MAX_IV_LENGTH];

    if (type != NULL) {

        l = EVP_CIPHER_CTX_iv_length(c);

        OPENSSL_assert(l <= sizeof(iv));

        i = ASN1_TYPE_get_int_octetstring(type, &num, iv, l);

        if (i != (int)l)

            return -1;

        key_bits = rc2_magic_to_meth((int)num);

        if (!key_bits)

            return -1;

        if (i > 0 && !EVP_CipherInit_ex(c, NULL, NULL, NULL, iv, -1))

            return -1;

        if (EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_RC2_KEY_BITS, key_bits,

                                NULL) <= 0

                || EVP_CIPHER_CTX_set_key_length(c, key_bits / 8) <= 0)

            return -1;

    }

    return i;

}

static int rc2_set_asn1_type_and_iv(EVP_CIPHER_CTX *c, ASN1_TYPE *type)

{

    long num;

    int i = 0, j;

    if (type != NULL) {

        num = rc2_meth_to_magic(c);

        j = EVP_CIPHER_CTX_iv_length(c);

        i = ASN1_TYPE_set_int_octetstring(type, num,

                                          (unsigned char *)EVP_CIPHER_CTX_original_iv(c),

                                          j);

    }

    return i;

}

static int rc2_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr)

{

    switch (type) {

    case EVP_CTRL_INIT:

        data(c)->key_bits = EVP_CIPHER_CTX_key_length(c) * 8;

        return 1;

    case EVP_CTRL_GET_RC2_KEY_BITS:

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

        return 1;

    case EVP_CTRL_SET_RC2_KEY_BITS:

        if (arg > 0) {

            data(c)->key_bits = arg;

            return 1;

        }

        return 0;

# ifdef PBE_PRF_TEST

    case EVP_CTRL_PBE_PRF_NID:

        *(int *)ptr = NID_hmacWithMD5;

        return 1;

# endif

    default:

        return -1;

    }

}

#endif