github/chiaki
1
0
Fork 0
mirror of https://git.sr.ht/~thestr4ng3r/chiaki synced 2025-08-14 18:57:07 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

Finish RPCrypt

Browse source
This commit is contained in:
Florian Märkl 2018-11-17 16:27:31 +01:00
commit 9e61417617
No known key found for this signature in database
GPG key ID: 125BC8A5A6A1E857
3 changed files with 191 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
lib/include/chiaki/rpcrypt.h
View file

@ -21,6 +21,7 @@
#include "common.h"
#include <stdint.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
@ -39,6 +40,8 @@ CHIAKI_EXPORT void chiaki_rpcrypt_bright_ambassador(uint8_t *bright, uint8_t *am
CHIAKI_EXPORT void chiaki_rpcrypt_init(ChiakiRPCrypt *rpcrypt, const uint8_t *nonce, const uint8_t *morning);
CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_generate_iv(ChiakiRPCrypt *rpcrypt, uint8_t *iv, uint64_t counter);
CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_encrypt(ChiakiRPCrypt *rpcrypt, uint64_t counter, uint8_t *buf, size_t buf_size);
CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_decrypt(ChiakiRPCrypt *rpcrypt, uint64_t counter, uint8_t *buf, size_t buf_size);
#ifdef __cplusplus
}

88
lib/src/rpcrypt.c
View file

@ -21,6 +21,7 @@
#include <openssl/evp.h>
#include <string.h>
#include <stdbool.h>
CHIAKI_EXPORT void chiaki_rpcrypt_bright_ambassador(uint8_t *bright, uint8_t *ambassador, const uint8_t *nonce, const uint8_t *morning)
@ -79,4 +80,89 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_generate_iv(ChiakiRPCrypt *rpcrypt,
memcpy(iv, hmac, CHIAKI_KEY_BYTES);
return CHIAKI_ERR_SUCCESS;
}
}
static ChiakiErrorCode chiaki_rpcrypt_crypt(ChiakiRPCrypt *rpcrypt, uint64_t counter, uint8_t *buf, size_t buf_size, bool encrypt)
{
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
if(!ctx)
return CHIAKI_ERR_UNKNOWN;
uint8_t iv[CHIAKI_KEY_BYTES];
ChiakiErrorCode err = chiaki_rpcrypt_generate_iv(rpcrypt, iv, counter);
if(err != CHIAKI_ERR_SUCCESS)
return err;
#define FAIL(err) do { EVP_CIPHER_CTX_free(ctx); return (err); } while(0);
if(encrypt)
{
if(!EVP_EncryptInit_ex(ctx, EVP_aes_128_cfb128(), NULL, rpcrypt->bright, iv))
FAIL(CHIAKI_ERR_UNKNOWN);
}
else
{
if(!EVP_DecryptInit_ex(ctx, EVP_aes_128_cfb128(), NULL, rpcrypt->bright, iv))
FAIL(CHIAKI_ERR_UNKNOWN);
}
if(!EVP_CIPHER_CTX_set_padding(ctx, 0))
FAIL(CHIAKI_ERR_UNKNOWN);
if(buf_size % CHIAKI_KEY_BYTES)
{
size_t padded_size = ((buf_size + CHIAKI_KEY_BYTES - 1) / CHIAKI_KEY_BYTES) * CHIAKI_KEY_BYTES;
uint8_t *tmp = malloc(padded_size);
if(!tmp)
FAIL(CHIAKI_ERR_MEMORY);
memcpy(tmp, buf, buf_size);
memset(tmp + buf_size, 0, padded_size - buf_size);
int outl = (int)padded_size;
int success;
if(encrypt)
success = EVP_EncryptUpdate(ctx, tmp, &outl, tmp, outl);
else
success = EVP_DecryptUpdate(ctx, tmp, &outl, tmp, outl);
if(!success || outl != (int)padded_size)
{
free(tmp);
FAIL(CHIAKI_ERR_UNKNOWN);
}
memcpy(buf, tmp, buf_size);
free(tmp);
}
else
{
int outl = (int)buf_size;
if(encrypt)
{
if(!EVP_EncryptUpdate(ctx, buf, &outl, buf, outl))
FAIL(CHIAKI_ERR_UNKNOWN);
}
else
{
if(!EVP_DecryptUpdate(ctx, buf, &outl, buf, outl))
FAIL(CHIAKI_ERR_UNKNOWN);
}
if(outl != (int)buf_size)
FAIL(CHIAKI_ERR_UNKNOWN);
}
#undef FAIL
EVP_CIPHER_CTX_free(ctx);
return CHIAKI_ERR_SUCCESS;
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_encrypt(ChiakiRPCrypt *rpcrypt, uint64_t counter, uint8_t *buf, size_t buf_size)
{
return chiaki_rpcrypt_crypt(rpcrypt, counter, buf, buf_size, true);
}
CHIAKI_EXPORT ChiakiErrorCode chiaki_rpcrypt_decrypt(ChiakiRPCrypt *rpcrypt, uint64_t counter, uint8_t *buf, size_t buf_size)
{
return chiaki_rpcrypt_crypt(rpcrypt, counter, buf, buf_size, false);
}