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/*
* Copyright 2018-2021 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
*/
#include <openssl/evp.h>
#include <openssl/core_names.h>
#include <openssl/proverr.h>
#include <openssl/err.h>
#include "prov/provider_ctx.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_util.h"
static OSSL_FUNC_kdf_newctx_fn kdf_pvk_new;
static OSSL_FUNC_kdf_freectx_fn kdf_pvk_free;
static OSSL_FUNC_kdf_reset_fn kdf_pvk_reset;
static OSSL_FUNC_kdf_derive_fn kdf_pvk_derive;
static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pvk_settable_ctx_params;
static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pvk_set_ctx_params;
static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pvk_gettable_ctx_params;
static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pvk_get_ctx_params;
typedef struct {
void *provctx;
unsigned char *pass;
size_t pass_len;
unsigned char *salt;
size_t salt_len;
PROV_DIGEST digest;
} KDF_PVK;
static void kdf_pvk_init(KDF_PVK *ctx);
static void *kdf_pvk_new(void *provctx)
{
KDF_PVK *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return NULL;
}
ctx->provctx = provctx;
kdf_pvk_init(ctx);
return ctx;
}
static void kdf_pvk_cleanup(KDF_PVK *ctx)
{
ossl_prov_digest_reset(&ctx->digest);
OPENSSL_free(ctx->salt);
OPENSSL_clear_free(ctx->pass, ctx->pass_len);
OPENSSL_cleanse(ctx, sizeof(*ctx));
}
static void kdf_pvk_free(void *vctx)
{
KDF_PVK *ctx = (KDF_PVK *)vctx;
if (ctx != NULL) {
kdf_pvk_cleanup(ctx);
OPENSSL_free(ctx);
}
}
static void kdf_pvk_reset(void *vctx)
{
KDF_PVK *ctx = (KDF_PVK *)vctx;
void *provctx = ctx->provctx;
kdf_pvk_cleanup(ctx);
ctx->provctx = provctx;
kdf_pvk_init(ctx);
}
static void kdf_pvk_init(KDF_PVK *ctx)
{
OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
SN_sha1, 0);
if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
/* This is an error, but there is no way to indicate such directly */
ossl_prov_digest_reset(&ctx->digest);
}
static int pvk_set_membuf(unsigned char **buffer, size_t *buflen,
const OSSL_PARAM *p)
{
OPENSSL_clear_free(*buffer, *buflen);
if (p->data_size == 0) {
if ((*buffer = OPENSSL_malloc(1)) == NULL) {
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
return 0;
}
} else if (p->data != NULL) {
*buffer = NULL;
if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
return 0;
}
return 1;
}
static int kdf_pvk_derive(void *vctx, unsigned char *key, size_t keylen,
const OSSL_PARAM params[])
{
KDF_PVK *ctx = (KDF_PVK *)vctx;
const EVP_MD *md;
EVP_MD_CTX *mctx;
int res;
if (!ossl_prov_is_running() || !kdf_pvk_set_ctx_params(ctx, params))
return 0;
if (ctx->pass == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
return 0;
}
if (ctx->salt == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
return 0;
}
md = ossl_prov_digest_md(&ctx->digest);
if (md == NULL) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
return 0;
}
res = EVP_MD_get_size(md);
if (res <= 0) {
ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
return 0;
}
if ((size_t)res > keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_LENGTH_TOO_LARGE);
return 0;
}
mctx = EVP_MD_CTX_new();
res = mctx != NULL
&& EVP_DigestInit_ex(mctx, md, NULL)
&& EVP_DigestUpdate(mctx, ctx->salt, ctx->salt_len)
&& EVP_DigestUpdate(mctx, ctx->pass, ctx->pass_len)
&& EVP_DigestFinal_ex(mctx, key, NULL);
EVP_MD_CTX_free(mctx);
return res;
}
static int kdf_pvk_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
const OSSL_PARAM *p;
KDF_PVK *ctx = vctx;
OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
if (params == NULL)
return 1;
if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
if (!pvk_set_membuf(&ctx->pass, &ctx->pass_len, p))
return 0;
if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
if (!pvk_set_membuf(&ctx->salt, &ctx->salt_len, p))
return 0;
}
return 1;
}
static const OSSL_PARAM *kdf_pvk_settable_ctx_params(ossl_unused void *ctx,
ossl_unused void *p_ctx)
{
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
OSSL_PARAM_END
};
return known_settable_ctx_params;
}
static int kdf_pvk_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
return OSSL_PARAM_set_size_t(p, SIZE_MAX);
return -2;
}
static const OSSL_PARAM *kdf_pvk_gettable_ctx_params(ossl_unused void *ctx,
ossl_unused void *p_ctx)
{
static const OSSL_PARAM known_gettable_ctx_params[] = {
OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
OSSL_PARAM_END
};
return known_gettable_ctx_params;
}
const OSSL_DISPATCH ossl_kdf_pvk_functions[] = {
{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pvk_new },
{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pvk_free },
{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pvk_reset },
{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pvk_derive },
{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
(void(*)(void))kdf_pvk_settable_ctx_params },
{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pvk_set_ctx_params },
{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
(void(*)(void))kdf_pvk_gettable_ctx_params },
{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pvk_get_ctx_params },
{ 0, NULL }
};
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