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openssl/crypto/evp/asymcipher.c

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/*
* Copyright 2006-2020 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include "internal/cryptlib.h"
#include "crypto/evp.h"
#include "internal/provider.h"
#include "evp_local.h"
static int evp_pkey_asym_cipher_init(EVP_PKEY_CTX *ctx, int operation)
{
int ret = 0;
void *provkey = NULL;
EVP_ASYM_CIPHER *cipher = NULL;
EVP_KEYMGMT *tmp_keymgmt = NULL;
const char *supported_ciph = NULL;
if (ctx == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = operation;
/*
* TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
* calls can be removed.
*/
ERR_set_mark();
if (evp_pkey_ctx_is_legacy(ctx))
goto legacy;
/*
* Ensure that the key is provided, either natively, or as a cached export.
* If not, go legacy
*/
tmp_keymgmt = ctx->keymgmt;
provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
&tmp_keymgmt, ctx->propquery);
if (provkey == NULL)
goto legacy;
if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
ERR_clear_last_mark();
ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
goto err;
}
EVP_KEYMGMT_free(ctx->keymgmt);
ctx->keymgmt = tmp_keymgmt;
if (ctx->keymgmt->query_operation_name != NULL)
supported_ciph =
ctx->keymgmt->query_operation_name(OSSL_OP_ASYM_CIPHER);
/*
* If we didn't get a supported ciph, assume there is one with the
* same name as the key type.
*/
if (supported_ciph == NULL)
supported_ciph = ctx->keytype;
/*
* Because we cleared out old ops, we shouldn't need to worry about
* checking if cipher is already there.
*/
cipher =
EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph, ctx->propquery);
if (cipher == NULL
|| (EVP_KEYMGMT_provider(ctx->keymgmt)
!= EVP_ASYM_CIPHER_provider(cipher))) {
/*
* We don't need to free ctx->keymgmt here, as it's not necessarily
* tied to this operation. It will be freed by EVP_PKEY_CTX_free().
*/
EVP_ASYM_CIPHER_free(cipher);
goto legacy;
}
/*
* TODO remove this when legacy is gone
* If we don't have the full support we need with provided methods,
* let's go see if legacy does.
*/
ERR_pop_to_mark();
/* No more legacy from here down to legacy: */
ctx->op.ciph.cipher = cipher;
ctx->op.ciph.ciphprovctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
if (ctx->op.ciph.ciphprovctx == NULL) {
/* The provider key can stay in the cache */
EVPerr(0, EVP_R_INITIALIZATION_ERROR);
goto err;
}
switch (operation) {
case EVP_PKEY_OP_ENCRYPT:
if (cipher->encrypt_init == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
ret = -2;
goto err;
}
ret = cipher->encrypt_init(ctx->op.ciph.ciphprovctx, provkey);
break;
case EVP_PKEY_OP_DECRYPT:
if (cipher->decrypt_init == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
ret = -2;
goto err;
}
ret = cipher->decrypt_init(ctx->op.ciph.ciphprovctx, provkey);
break;
default:
EVPerr(0, EVP_R_INITIALIZATION_ERROR);
goto err;
}
if (ret <= 0)
goto err;
return 1;
legacy:
/*
* TODO remove this when legacy is gone
* If we don't have the full support we need with provided methods,
* let's go see if legacy does.
*/
ERR_pop_to_mark();
if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
switch(ctx->operation) {
case EVP_PKEY_OP_ENCRYPT:
if (ctx->pmeth->encrypt_init == NULL)
return 1;
ret = ctx->pmeth->encrypt_init(ctx);
break;
case EVP_PKEY_OP_DECRYPT:
if (ctx->pmeth->decrypt_init == NULL)
return 1;
ret = ctx->pmeth->decrypt_init(ctx);
break;
default:
EVPerr(0, EVP_R_INITIALIZATION_ERROR);
ret = -1;
}
err:
if (ret <= 0) {
evp_pkey_ctx_free_old_ops(ctx);
ctx->operation = EVP_PKEY_OP_UNDEFINED;
}
return ret;
}
int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
{
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT);
}
int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
if (ctx == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
return -1;
}
if (ctx->op.ciph.ciphprovctx == NULL)
goto legacy;
ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.ciphprovctx, out, outlen,
(out == NULL ? 0 : *outlen), in, inlen);
return ret;
legacy:
if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
}
int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
{
return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT);
}
int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
if (ctx == NULL) {
EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
return -1;
}
if (ctx->op.ciph.ciphprovctx == NULL)
goto legacy;
ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.ciphprovctx, out, outlen,
(out == NULL ? 0 : *outlen), in, inlen);
return ret;
legacy:
if (ctx->pmeth == NULL || ctx->pmeth->decrypt == NULL) {
EVPerr(EVP_F_EVP_PKEY_DECRYPT,
EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
}
M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
}
static EVP_ASYM_CIPHER *evp_asym_cipher_new(OSSL_PROVIDER *prov)
{
EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));
if (cipher == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
return NULL;
}
cipher->lock = CRYPTO_THREAD_lock_new();
if (cipher->lock == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
OPENSSL_free(cipher);
return NULL;
}
cipher->prov = prov;
ossl_provider_up_ref(prov);
cipher->refcnt = 1;
return cipher;
}
static void *evp_asym_cipher_from_dispatch(int name_id,
const OSSL_DISPATCH *fns,
OSSL_PROVIDER *prov)
{
EVP_ASYM_CIPHER *cipher = NULL;
int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
int gparamfncnt = 0, sparamfncnt = 0;
if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
goto err;
}
cipher->name_id = name_id;
for (; fns->function_id != 0; fns++) {
switch (fns->function_id) {
case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
if (cipher->newctx != NULL)
break;
cipher->newctx = OSSL_FUNC_asym_cipher_newctx(fns);
ctxfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
if (cipher->encrypt_init != NULL)
break;
cipher->encrypt_init = OSSL_FUNC_asym_cipher_encrypt_init(fns);
encfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
if (cipher->encrypt != NULL)
break;
cipher->encrypt = OSSL_FUNC_asym_cipher_encrypt(fns);
encfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
if (cipher->decrypt_init != NULL)
break;
cipher->decrypt_init = OSSL_FUNC_asym_cipher_decrypt_init(fns);
decfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
if (cipher->decrypt != NULL)
break;
cipher->decrypt = OSSL_FUNC_asym_cipher_decrypt(fns);
decfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_FREECTX:
if (cipher->freectx != NULL)
break;
cipher->freectx = OSSL_FUNC_asym_cipher_freectx(fns);
ctxfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
if (cipher->dupctx != NULL)
break;
cipher->dupctx = OSSL_FUNC_asym_cipher_dupctx(fns);
break;
case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
if (cipher->get_ctx_params != NULL)
break;
cipher->get_ctx_params
= OSSL_FUNC_asym_cipher_get_ctx_params(fns);
gparamfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
if (cipher->gettable_ctx_params != NULL)
break;
cipher->gettable_ctx_params
= OSSL_FUNC_asym_cipher_gettable_ctx_params(fns);
gparamfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
if (cipher->set_ctx_params != NULL)
break;
cipher->set_ctx_params
= OSSL_FUNC_asym_cipher_set_ctx_params(fns);
sparamfncnt++;
break;
case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
if (cipher->settable_ctx_params != NULL)
break;
cipher->settable_ctx_params
= OSSL_FUNC_asym_cipher_settable_ctx_params(fns);
sparamfncnt++;
break;
}
}
if (ctxfncnt != 2
|| (encfncnt != 0 && encfncnt != 2)
|| (decfncnt != 0 && decfncnt != 2)
|| (encfncnt != 2 && decfncnt != 2)
|| (gparamfncnt != 0 && gparamfncnt != 2)
|| (sparamfncnt != 0 && sparamfncnt != 2)) {
/*
* In order to be a consistent set of functions we must have at least
* a set of context functions (newctx and freectx) as well as a pair of
* "cipher" functions: (encrypt_init, encrypt) or
* (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
* optional, but if one of them is present then the other one must also
* be present. The same applies to get_ctx_params and
* gettable_ctx_params. The dupctx function is optional.
*/
ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
goto err;
}
return cipher;
err:
EVP_ASYM_CIPHER_free(cipher);
return NULL;
}
void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
{
if (cipher != NULL) {
int i;
CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
if (i > 0)
return;
ossl_provider_free(cipher->prov);
CRYPTO_THREAD_lock_free(cipher->lock);
OPENSSL_free(cipher);
}
}
int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
{
int ref = 0;
CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
return 1;
}
OSSL_PROVIDER *EVP_ASYM_CIPHER_provider(const EVP_ASYM_CIPHER *cipher)
{
return cipher->prov;
}
EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
const char *properties)
{
return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
evp_asym_cipher_from_dispatch,
(int (*)(void *))EVP_ASYM_CIPHER_up_ref,
(void (*)(void *))EVP_ASYM_CIPHER_free);
}
int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name)
{
return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
}
int EVP_ASYM_CIPHER_number(const EVP_ASYM_CIPHER *cipher)
{
return cipher->name_id;
}
void EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
void (*fn)(EVP_ASYM_CIPHER *cipher,
void *arg),
void *arg)
{
evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
(void (*)(void *, void *))fn, arg,
evp_asym_cipher_from_dispatch,
(void (*)(void *))EVP_ASYM_CIPHER_free);
}
void EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
void (*fn)(const char *name, void *data),
void *data)
{
if (cipher->prov != NULL)
evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
}
const OSSL_PARAM *EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER *cip)
{
void *provctx;
if (cip == NULL || cip->gettable_ctx_params == NULL)
return NULL;
provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
return cip->gettable_ctx_params(provctx);
}
const OSSL_PARAM *EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER *cip)
{
void *provctx;
if (cip == NULL || cip->settable_ctx_params == NULL)
return NULL;
provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
return cip->settable_ctx_params(provctx);
}
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