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/* Fluent Bit
* ==========
* Copyright (C) 2019-2020 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fluent-bit/flb_crypto.h>
#include <openssl/bio.h>
#include <string.h>
static int flb_crypto_get_rsa_padding_type_by_id(int padding_type_id)
{
int result;
if (padding_type_id == FLB_CRYPTO_PADDING_PKCS1) {
result = RSA_PKCS1_PADDING;
}
else if (padding_type_id == FLB_CRYPTO_PADDING_PKCS1_OEAP) {
result = RSA_PKCS1_OAEP_PADDING;
}
else if (padding_type_id == FLB_CRYPTO_PADDING_PKCS1_X931) {
result = RSA_X931_PADDING;
}
else if (padding_type_id == FLB_CRYPTO_PADDING_PKCS1_PSS) {
result = RSA_PKCS1_PSS_PADDING;
}
else {
result = FLB_CRYPTO_PADDING_NONE;
}
return result;
}
static const EVP_MD *flb_crypto_get_digest_algorithm_instance_by_id(int algorithm_id)
{
const EVP_MD *algorithm;
if (algorithm_id == FLB_HASH_SHA256) {
algorithm = EVP_sha256();
}
else if (algorithm_id == FLB_HASH_SHA512) {
algorithm = EVP_sha512();
}
else if (algorithm_id == FLB_HASH_MD5) {
algorithm = EVP_md5();
}
else {
algorithm = NULL;
}
return algorithm;
}
static int flb_crypto_import_pem_key(int key_type,
unsigned char *key,
size_t key_length,
EVP_PKEY **ingested_key)
{
BIO *io_provider;
int result;
if (key_type != FLB_CRYPTO_PUBLIC_KEY &&
key_type != FLB_CRYPTO_PRIVATE_KEY) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (ingested_key == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
result = FLB_CRYPTO_BACKEND_ERROR;
io_provider = BIO_new_mem_buf((void*) key, key_length);
if (io_provider != NULL) {
if (ingested_key != NULL) {
if (key_type == FLB_CRYPTO_PRIVATE_KEY) {
*ingested_key = PEM_read_bio_PrivateKey(io_provider,
NULL, NULL,
NULL);
}
else if (key_type == FLB_CRYPTO_PUBLIC_KEY) {
*ingested_key = PEM_read_bio_PUBKEY(io_provider,
NULL, NULL,
NULL);
// printf("\n\nFAILURE? %p\n\n", *ingested_key);
// printf("ERROR : %s\n", ERR_error_string(ERR_get_error(), NULL));
// exit(0);
}
if (*ingested_key != NULL) {
result = FLB_CRYPTO_SUCCESS;
}
}
BIO_free_all(io_provider);
}
return result;
}
int flb_crypto_init(struct flb_crypto *context,
int padding_type,
int digest_algorithm,
int key_type,
unsigned char *key,
size_t key_length)
{
int result;
if (context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (key == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (key_length == 0) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
memset(context, 0, sizeof(struct flb_crypto));
result = flb_crypto_import_pem_key(key_type,
key,
key_length,
&context->key);
if (result != FLB_CRYPTO_SUCCESS) {
if (result == FLB_CRYPTO_BACKEND_ERROR) {
context->last_error = ERR_get_error();
}
flb_crypto_cleanup(context);
return result;
}
context->backend_context = EVP_PKEY_CTX_new(context->key, NULL);
if (context->backend_context == NULL) {
context->last_error = ERR_get_error();
flb_crypto_cleanup(context);
return result;
}
context->block_size = (size_t) EVP_PKEY_size(context->key);
context->padding_type = flb_crypto_get_rsa_padding_type_by_id(padding_type);
context->digest_algorithm = flb_crypto_get_digest_algorithm_instance_by_id(digest_algorithm);
return FLB_CRYPTO_SUCCESS;
}
int flb_crypto_cleanup(struct flb_crypto *context)
{
if (context->backend_context != NULL) {
EVP_PKEY_free(context->key);
context->key = NULL;
}
if (context->backend_context != NULL) {
EVP_PKEY_CTX_free(context->backend_context);
context->backend_context = NULL;
}
return FLB_CRYPTO_SUCCESS;
}
int flb_crypto_transform(struct flb_crypto *context,
int operation,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
int result = FLB_CRYPTO_BACKEND_ERROR;
if (context == NULL) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (operation != FLB_CRYPTO_OPERATION_SIGN &&
operation != FLB_CRYPTO_OPERATION_ENCRYPT &&
operation != FLB_CRYPTO_OPERATION_DECRYPT) {
return FLB_CRYPTO_INVALID_ARGUMENT;
}
if (context->last_operation == FLB_CRYPTO_OPERATION_NONE) {
if (operation == FLB_CRYPTO_OPERATION_SIGN) {
result = EVP_PKEY_sign_init(context->backend_context);
}
else if (operation == FLB_CRYPTO_OPERATION_ENCRYPT) {
result = EVP_PKEY_encrypt_init(context->backend_context);
}
else if (operation == FLB_CRYPTO_OPERATION_DECRYPT) {
result = EVP_PKEY_decrypt_init(context->backend_context);
}
if (result == 1) {
result = EVP_PKEY_CTX_set_rsa_padding(context->backend_context,
context->padding_type);
if (result > 0) {
if (context->digest_algorithm != NULL) {
result = EVP_PKEY_CTX_set_signature_md(context->backend_context,
context->digest_algorithm);
}
}
if (result > 0) {
result = 1;
}
}
if (result != 1) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
context->last_operation = operation;
}
else if (context->last_operation != operation) {
return FLB_CRYPTO_INVALID_STATE;
}
if (operation == FLB_CRYPTO_OPERATION_SIGN) {
result = EVP_PKEY_sign(context->backend_context,
output_buffer, output_length,
input_buffer, input_length);
}
else if(operation == FLB_CRYPTO_OPERATION_ENCRYPT) {
result = EVP_PKEY_encrypt(context->backend_context,
output_buffer, output_length,
input_buffer, input_length);
}
else if(operation == FLB_CRYPTO_OPERATION_DECRYPT) {
result = EVP_PKEY_decrypt(context->backend_context,
output_buffer, output_length,
input_buffer, input_length);
}
if (result != 1) {
context->last_error = ERR_get_error();
return FLB_CRYPTO_BACKEND_ERROR;
}
return FLB_CRYPTO_SUCCESS;
}
int flb_crypto_sign(struct flb_crypto *context,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
return flb_crypto_transform(context,
FLB_CRYPTO_OPERATION_SIGN,
input_buffer,
input_length,
output_buffer,
output_length);
}
int flb_crypto_encrypt(struct flb_crypto *context,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
return flb_crypto_transform(context,
FLB_CRYPTO_OPERATION_ENCRYPT,
input_buffer,
input_length,
output_buffer,
output_length);
}
int flb_crypto_decrypt(struct flb_crypto *context,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
return flb_crypto_transform(context,
FLB_CRYPTO_OPERATION_DECRYPT,
input_buffer,
input_length,
output_buffer,
output_length);
}
int flb_crypto_sign_simple(int key_type,
int padding_type,
int digest_algorithm,
unsigned char *key,
size_t key_length,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
struct flb_crypto context;
int result;
result = flb_crypto_init(&context,
padding_type,
digest_algorithm,
key_type,
key,
key_length);
if (result == FLB_CRYPTO_SUCCESS) {
result = flb_crypto_sign(&context,
input_buffer, input_length,
output_buffer, output_length);
flb_crypto_cleanup(&context);
}
return result;
}
int flb_crypto_encrypt_simple(int padding_type,
unsigned char *key,
size_t key_length,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
struct flb_crypto context;
int result;
result = flb_crypto_init(&context,
padding_type,
FLB_HASH_NONE,
FLB_CRYPTO_PUBLIC_KEY,
key,
key_length);
if (result == FLB_CRYPTO_SUCCESS) {
result = flb_crypto_encrypt(&context,
input_buffer, input_length,
output_buffer, output_length);
flb_crypto_cleanup(&context);
}
return result;
}
int flb_crypto_decrypt_simple(int padding_type,
unsigned char *key,
size_t key_length,
unsigned char *input_buffer,
size_t input_length,
unsigned char *output_buffer,
size_t *output_length)
{
struct flb_crypto context;
int result;
result = flb_crypto_init(&context,
padding_type,
FLB_HASH_NONE,
FLB_CRYPTO_PRIVATE_KEY,
key,
key_length);
if (result == FLB_CRYPTO_SUCCESS) {
result = flb_crypto_decrypt(&context,
input_buffer, input_length,
output_buffer, output_length);
flb_crypto_cleanup(&context);
}
return result;
}
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