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secure_message.c
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secure_message.c
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/*
* Copyright (c) 2015 Cossack Labs Limited
*
* 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 <themis/themis_error.h>
#include <themis/secure_message.h>
#include <themis/secure_message_wrapper.h>
#include <soter/soter_t.h>
#ifndef THEMIS_RSA_KEY_LENGTH
#define THEMIS_RSA_KEY_LENGTH RSA_KEY_LENGTH_2048
#endif
themis_status_t themis_gen_key_pair(soter_sign_alg_t alg,
uint8_t* private_key,
size_t* private_key_length,
uint8_t* public_key,
size_t* public_key_length)
{
soter_sign_ctx_t* ctx=soter_sign_create(alg,NULL,0,NULL,0);
THEMIS_CHECK(ctx!=NULL);
soter_status_t res=soter_sign_export_key(ctx, private_key, private_key_length, true);
if(res!=THEMIS_SUCCESS && res!=THEMIS_BUFFER_TOO_SMALL){
soter_sign_destroy(ctx);
return res;
}
soter_status_t res2=soter_sign_export_key(ctx, public_key, public_key_length, false);
if(res2!=THEMIS_SUCCESS && res2!=THEMIS_BUFFER_TOO_SMALL){
soter_sign_destroy(ctx);
return res;
}
soter_sign_destroy(ctx);
if(res==THEMIS_BUFFER_TOO_SMALL || res2==THEMIS_BUFFER_TOO_SMALL){
return THEMIS_BUFFER_TOO_SMALL;
}
return THEMIS_SUCCESS;
}
themis_status_t themis_gen_rsa_key_pair(uint8_t* private_key,
size_t* private_key_length,
uint8_t* public_key,
size_t* public_key_length){
soter_rsa_key_pair_gen_t* key_pair_ctx=soter_rsa_key_pair_gen_create(THEMIS_RSA_KEY_LENGTH);
THEMIS_CHECK(key_pair_ctx!=NULL);
soter_status_t res=soter_rsa_key_pair_gen_export_key(key_pair_ctx, private_key, private_key_length, true);
if(res!=THEMIS_SUCCESS && res != THEMIS_BUFFER_TOO_SMALL){
soter_rsa_key_pair_gen_destroy(key_pair_ctx);
return res;
}
soter_status_t res2=soter_rsa_key_pair_gen_export_key(key_pair_ctx, public_key, public_key_length, false);
if(res2!=THEMIS_SUCCESS && res2!=THEMIS_BUFFER_TOO_SMALL){
soter_rsa_key_pair_gen_destroy(key_pair_ctx);
return res2;
}
soter_rsa_key_pair_gen_destroy(key_pair_ctx);
if(res==THEMIS_BUFFER_TOO_SMALL || res2==THEMIS_BUFFER_TOO_SMALL){
return THEMIS_BUFFER_TOO_SMALL;
}
return THEMIS_SUCCESS;
}
themis_status_t themis_gen_ec_key_pair(uint8_t* private_key,
size_t* private_key_length,
uint8_t* public_key,
size_t* public_key_length){
return themis_gen_key_pair(SOTER_SIGN_ecdsa_none_pkcs8, private_key, private_key_length, public_key, public_key_length);
}
themis_status_t themis_secure_message_encrypt(const uint8_t* private_key,
const size_t private_key_length,
const uint8_t* public_key,
const size_t public_key_length,
const uint8_t* message,
const size_t message_length,
uint8_t* encrypted_message,
size_t* encrypted_message_length)
{
THEMIS_CHECK_PARAM(private_key!=NULL);
THEMIS_CHECK_PARAM(private_key_length!=0);
THEMIS_CHECK_PARAM(public_key!=NULL);
THEMIS_CHECK_PARAM(public_key_length!=0);
THEMIS_CHECK_PARAM(message!=NULL);
THEMIS_CHECK_PARAM(message_length!=0);
THEMIS_CHECK_PARAM(encrypted_message_length!=NULL);
return themis_secure_message_wrap(private_key, private_key_length, public_key, public_key_length, message, message_length, encrypted_message, encrypted_message_length);
}
themis_status_t themis_secure_message_decrypt(const uint8_t* private_key,
const size_t private_key_length,
const uint8_t* public_key,
const size_t public_key_length,
const uint8_t* encrypted_message,
const size_t encrypted_message_length,
uint8_t* message,
size_t* message_length)
{
THEMIS_CHECK_PARAM(private_key!=NULL);
THEMIS_CHECK_PARAM(private_key_length!=0);
THEMIS_CHECK_PARAM(public_key!=NULL);
THEMIS_CHECK_PARAM(public_key_length!=0);
THEMIS_CHECK_PARAM(encrypted_message!=NULL);
THEMIS_CHECK_PARAM(encrypted_message_length!=0);
THEMIS_CHECK_PARAM(message_length!=NULL);
return themis_secure_message_unwrap(private_key, private_key_length, public_key, public_key_length, encrypted_message, encrypted_message_length, message, message_length);
}
themis_status_t themis_secure_message_sign(const uint8_t* private_key,
const size_t private_key_length,
const uint8_t* message,
const size_t message_length,
uint8_t* signed_message,
size_t* signed_message_length)
{
THEMIS_CHECK_PARAM(private_key!=NULL);
THEMIS_CHECK_PARAM(private_key_length!=0);
THEMIS_CHECK_PARAM(message!=NULL);
THEMIS_CHECK_PARAM(message_length!=0);
THEMIS_CHECK_PARAM(signed_message_length!=NULL);
return themis_secure_message_wrap(private_key, private_key_length, NULL, 0, message, message_length, signed_message, signed_message_length);
}
themis_status_t themis_secure_message_verify(const uint8_t* public_key,
const size_t public_key_length,
const uint8_t* signed_message,
const size_t signed_message_length,
uint8_t* message,
size_t* message_length)
{
THEMIS_CHECK_PARAM(public_key!=NULL);
THEMIS_CHECK_PARAM(public_key_length!=0);
THEMIS_CHECK_PARAM(signed_message!=NULL);
THEMIS_CHECK_PARAM(signed_message_length!=0);
THEMIS_CHECK_PARAM(message_length!=NULL);
return themis_secure_message_unwrap(NULL, 0, public_key, public_key_length, signed_message, signed_message_length, message, message_length);
}
themis_status_t themis_secure_message_wrap(const uint8_t* private_key,
const size_t private_key_length,
const uint8_t* public_key,
const size_t public_key_length,
const uint8_t* message,
const size_t message_length,
uint8_t* wrapped_message,
size_t* wrapped_message_length){
THEMIS_CHECK_PARAM(private_key!=NULL);
THEMIS_CHECK_PARAM(private_key_length!=0);
THEMIS_CHECK_PARAM(message!=NULL);
THEMIS_CHECK_PARAM(message_length!=0);
THEMIS_CHECK_PARAM(wrapped_message_length!=NULL);
if(public_key==NULL && public_key_length==0){
themis_secure_message_signer_t* ctx=NULL;
ctx = themis_secure_message_signer_init(private_key, private_key_length);
THEMIS_CHECK(ctx!=NULL);
themis_status_t res=themis_secure_message_signer_proceed(ctx, message, message_length, wrapped_message, wrapped_message_length);
themis_secure_message_signer_destroy(ctx);
return res;
} else {
THEMIS_CHECK_PARAM(public_key!=NULL);
THEMIS_CHECK_PARAM(public_key_length!=0);
themis_secure_message_encrypter_t* ctx=NULL;
ctx = themis_secure_message_encrypter_init(private_key, private_key_length, public_key, public_key_length);
THEMIS_CHECK__(ctx!=NULL, return THEMIS_INVALID_PARAMETER);
themis_status_t res=themis_secure_message_encrypter_proceed(ctx, message, message_length, wrapped_message, wrapped_message_length);
themis_secure_message_encrypter_destroy(ctx);
return res;
}
return THEMIS_INVALID_PARAMETER;
}
themis_status_t themis_secure_message_unwrap(const uint8_t* private_key,
const size_t private_key_length,
const uint8_t* public_key,
const size_t public_key_length,
const uint8_t* wrapped_message,
const size_t wrapped_message_length,
uint8_t* message,
size_t* message_length){
THEMIS_CHECK_PARAM(public_key!=NULL);
THEMIS_CHECK_PARAM(public_key_length!=0);
THEMIS_CHECK_PARAM(wrapped_message!=NULL);
THEMIS_CHECK_PARAM(wrapped_message_length!=0);
THEMIS_CHECK_PARAM(message_length!=NULL);
themis_secure_message_hdr_t* message_hdr=(themis_secure_message_hdr_t*)wrapped_message;
THEMIS_CHECK_PARAM(IS_THEMIS_SECURE_MESSAGE_SIGNED(message_hdr->message_type) || IS_THEMIS_SECURE_MESSAGE_ENCRYPTED(message_hdr->message_type));
THEMIS_CHECK_PARAM(wrapped_message_length>=THEMIS_SECURE_MESSAGE_LENGTH(message_hdr));
if(IS_THEMIS_SECURE_MESSAGE_SIGNED(message_hdr->message_type)){
themis_secure_message_verifier_t* ctx=NULL;
ctx = themis_secure_message_verifier_init(public_key, public_key_length);
THEMIS_CHECK(ctx!=NULL);
themis_status_t res=themis_secure_message_verifier_proceed(ctx, wrapped_message, wrapped_message_length, message, message_length);
themis_secure_message_verifier_destroy(ctx);
return res;
} else{
THEMIS_CHECK_PARAM(private_key!=NULL);
THEMIS_CHECK_PARAM(private_key_length!=0);
themis_secure_message_decrypter_t* ctx=NULL;
ctx = themis_secure_message_decrypter_init(private_key, private_key_length, public_key, public_key_length);
THEMIS_CHECK__(ctx, return THEMIS_INVALID_PARAMETER);
themis_status_t res=themis_secure_message_decrypter_proceed(ctx, wrapped_message, wrapped_message_length, message, message_length);
themis_secure_message_decrypter_destroy(ctx);
return res;
}
return THEMIS_INVALID_PARAMETER;
}