/*
* Copyright 2019-2020 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
*/
/* Dispatch functions for RC2 cipher modes ecb, cbc, ofb, cfb */
/*
* RC2 low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include "cipher_rc2.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"
#define RC2_40_MAGIC 0xa0
#define RC2_64_MAGIC 0x78
#define RC2_128_MAGIC 0x3a
static OSSL_OP_cipher_freectx_fn rc2_freectx;
static OSSL_OP_cipher_dupctx_fn rc2_dupctx;
static OSSL_OP_cipher_gettable_ctx_params_fn rc2_gettable_ctx_params;
static OSSL_OP_cipher_settable_ctx_params_fn rc2_settable_ctx_params;
static void rc2_freectx(void *vctx)
{
PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
OPENSSL_clear_free(ctx, sizeof(*ctx));
}
static void *rc2_dupctx(void *ctx)
{
PROV_RC2_CTX *in = (PROV_RC2_CTX *)ctx;
PROV_RC2_CTX *ret = OPENSSL_malloc(sizeof(*ret));
if (ret == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
*ret = *in;
return ret;
}
static int rc2_keybits_to_magic(int keybits)
{
switch (keybits) {
case 128:
return RC2_128_MAGIC;
case 64:
return RC2_64_MAGIC;
case 40:
return RC2_40_MAGIC;
}
ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_KEY_SIZE);
return 0;
}
static int rc2_magic_to_keybits(int magic)
{
switch (magic) {
case RC2_128_MAGIC:
return 128;
case RC2_64_MAGIC:
return 64;
case RC2_40_MAGIC:
return 40;
}
ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_KEY_SIZE);
return 0;
}
static int rc2_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
OSSL_PARAM *p;
if (!cipher_generic_get_ctx_params(vctx, params))
return 0;
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_RC2_KEYBITS);
if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->key_bits)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_ALG_ID);
if (p != NULL) {
long num;
int i;
ASN1_TYPE *type;
unsigned char *d = p->data;
unsigned char **dd = d == NULL ? NULL : &d;
if (p->data_type != OSSL_PARAM_OCTET_STRING) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
if ((type = ASN1_TYPE_new()) == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return 0;
}
/* Is this the original IV or the running IV? */
num = rc2_keybits_to_magic(ctx->key_bits);
if (!ASN1_TYPE_set_int_octetstring(type, num,
ctx->base.iv, ctx->base.ivlen)) {
ASN1_TYPE_free(type);
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return 0;
}
/*
* IF the caller has a buffer, we pray to the gods they got the
* size right. There's no way to tell the i2d functions...
*/
i = i2d_ASN1_TYPE(type, dd);
if (i >= 0)
p->return_size = (size_t)i;
ASN1_TYPE_free(type);
if (i < 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
return 0;
}
}
return 1;
}
static int rc2_set_ctx_params(void *vctx, OSSL_PARAM params[])
{
PROV_RC2_CTX *ctx = (PROV_RC2_CTX *)vctx;
const OSSL_PARAM *p;
if (!cipher_var_keylen_set_ctx_params(vctx, params))
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_RC2_KEYBITS);
if (p != NULL) {
if (!OSSL_PARAM_get_size_t(p, &ctx->key_bits)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
}
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_ALG_ID);
if (p != NULL) {
ASN1_TYPE *type = NULL;
long num = 0;
const unsigned char *d = p->data;
int ret = 1;
unsigned char iv[16];
if (p->data_type != OSSL_PARAM_OCTET_STRING
|| ctx->base.ivlen > sizeof(iv)
|| (type = d2i_ASN1_TYPE(NULL, &d, p->data_size)) == NULL
|| ((size_t)ASN1_TYPE_get_int_octetstring(type, &num, iv,
ctx->base.ivlen)
!= ctx->base.ivlen)
|| !cipher_generic_initiv(&ctx->base, iv, ctx->base.ivlen)
|| (ctx->key_bits = rc2_magic_to_keybits(num)) == 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
ret = 0;
}
ASN1_TYPE_free(type);
if (ret == 0)
return 0;
/*
* This code assumes that the caller will call
* EVP_CipherInit_ex() with a non NULL key in order to setup a key that
* uses the keylen and keybits that were set here.
*/
ctx->base.keylen = ctx->key_bits / 8;
}
return 1;
}
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_START(rc2)
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, NULL),
CIPHER_DEFAULT_GETTABLE_CTX_PARAMS_END(rc2)
CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_START(rc2)
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_RC2_KEYBITS, NULL),
CIPHER_DEFAULT_SETTABLE_CTX_PARAMS_END(rc2)
#define IMPLEMENT_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, blkbits, \
ivbits, typ) \
static OSSL_OP_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params; \
static int alg##_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
{ \
return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, flags, \
kbits, blkbits, ivbits); \
} \
static OSSL_OP_cipher_newctx_fn alg##_##kbits##_##lcmode##_newctx; \
static void * alg##_##kbits##_##lcmode##_newctx(void *provctx) \
{ \
PROV_##UCALG##_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); \
if (ctx != NULL) { \
cipher_generic_initkey(ctx, kbits, blkbits, ivbits, \
EVP_CIPH_##UCMODE##_MODE, flags, \
PROV_CIPHER_HW_##alg##_##lcmode(kbits), NULL); \
ctx->key_bits = kbits; \
} \
return ctx; \
} \
const OSSL_DISPATCH alg##kbits##lcmode##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void)) alg##_##kbits##_##lcmode##_newctx }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))cipher_generic_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))cipher_generic_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))cipher_generic_##typ##_update },\
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))cipher_generic_##typ##_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))cipher_generic_cipher }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void)) alg##_##kbits##_##lcmode##_get_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))rc2_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))rc2_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))rc2_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))rc2_settable_ctx_params }, \
{ 0, NULL } \
};
/* rc2128ecb_functions */
IMPLEMENT_cipher(rc2, RC2, ecb, ECB, EVP_CIPH_VARIABLE_LENGTH, 128, 64, 0, block)
/* rc2128cbc_functions */
IMPLEMENT_cipher(rc2, RC2, cbc, CBC, EVP_CIPH_VARIABLE_LENGTH, 128, 64, 64, block)
/* rc240cbc_functions */
IMPLEMENT_cipher(rc2, RC2, cbc, CBC, EVP_CIPH_VARIABLE_LENGTH, 40, 64, 64, block)
/* rc264cbc_functions */
IMPLEMENT_cipher(rc2, RC2, cbc, CBC, EVP_CIPH_VARIABLE_LENGTH, 64, 64, 64, block)
/* rc2128ofb128_functions */
IMPLEMENT_cipher(rc2, RC2, ofb128, OFB, EVP_CIPH_VARIABLE_LENGTH, 128, 8, 64, stream)
/* rc2128cfb128_functions */
IMPLEMENT_cipher(rc2, RC2, cfb128, CFB, EVP_CIPH_VARIABLE_LENGTH, 128, 8, 64, stream)
