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Update feat/optimize_inv_mix from master

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Dmitry Filimonchuk 2021-12-22 17:21:52 +03:00
commit ea77d6fee9
6 changed files with 85 additions and 42 deletions
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24
.github/workflows/c-cpp.yml vendored Normal file
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@ -0,0 +1,24 @@
name: CI
on:
push:
branches: [ master ]
pull_request:
branches: [ master ]
# Allows you to run this workflow manually from the Actions tab
workflow_dispatch:
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- name: make clean
run: make clean
- name: make
run: make
- name: make test
run: make test

20
CMakeLists.txt
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@ -1,9 +1,17 @@
cmake_minimum_required(VERSION 2.8.12)
cmake_minimum_required(VERSION 3.12)
project(tinyaes C ASM)
project(tiny-aes C)
add_library(tiny-aes
aes.c
)
add_library(${PROJECT_NAME} "")
target_sources(${PROJECT_NAME}
PRIVATE
${CMAKE_CURRENT_LIST_DIR}/aes.c
INTERFACE
${CMAKE_CURRENT_LIST_DIR}/aes.h
${CMAKE_CURRENT_LIST_DIR}/aes.hpp
)
target_include_directories(tiny-aes PRIVATE tiny-AES-c/)
target_include_directories(${PROJECT_NAME}
INTERFACE
${CMAKE_CURRENT_LIST_DIR}
)

14
README.md
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@ -1,3 +1,4 @@
![CI](https://github.com/kokke/tiny-AES-c/workflows/CI/badge.svg)
### Tiny AES in C
This is a small and portable implementation of the AES [ECB](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_.28ECB.29), [CTR](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29) and [CBC](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_Block_Chaining_.28CBC.29) encryption algorithms written in C.
@ -18,18 +19,19 @@ void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
void AES_ECB_encrypt(const struct AES_ctx* ctx, uint8_t* buf);
void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
/* Same function for encrypting as for decrypting in CTR mode */
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
```
Note:
Important notes:
* No padding is provided so for CBC and ECB all buffers should be multiples of 16 bytes. For padding [PKCS7](https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7) is recommendable.
* ECB mode is considered unsafe for most uses and is not implemented in streaming mode. If you need this mode, call the function for every block of 16 bytes you need encrypted. See [wikipedia's article on ECB](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_(ECB)) for more details.
* This library is designed for small code size and simplicity, intended for cases where small binary size, low memory footprint and portability is more important than high performance. If speed is a concern, you can try more complex libraries, e.g. [Mbed TLS](https://tls.mbed.org/), [OpenSSL](https://www.openssl.org/) etc.
You can choose to use any or all of the modes-of-operations, by defining the symbols CBC, CTR or ECB. See the header file for clarification.
You can choose to use any or all of the modes-of-operations, by defining the symbols CBC, CTR or ECB in [`aes.h`](https://github.com/kokke/tiny-AES-c/blob/master/aes.h) (read the comments for clarification).
C++ users should `#include` [aes.hpp](https://github.com/kokke/tiny-AES-c/blob/master/aes.hpp) instead of [aes.h](https://github.com/kokke/tiny-AES-c/blob/master/aes.h)
@ -75,7 +77,7 @@ This implementation is verified against the data in:
The other appendices in the document are valuable for implementation details on e.g. padding, generation of IVs and nonces in CTR-mode etc.
A heartfelt thank-you to all the nice people out there who have contributed to this project.
A heartfelt thank-you to [all the nice people](https://github.com/kokke/tiny-AES-c/graphs/contributors) out there who have contributed to this project.
All material in this repository is in the public domain.

30
aes.c
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@ -85,6 +85,7 @@ static const uint8_t sbox[256] = {
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
#if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
static const uint8_t rsbox[256] = {
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
@ -102,6 +103,7 @@ static const uint8_t rsbox[256] = {
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d };
#endif
// The round constant word array, Rcon[i], contains the values given by
// x to the power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8)
@ -129,13 +131,6 @@ static uint8_t getSBoxValue(uint8_t num)
}
*/
#define getSBoxValue(num) (sbox[(num)])
/*
static uint8_t getSBoxInvert(uint8_t num)
{
return rsbox[num];
}
*/
#define getSBoxInvert(num) (rsbox[(num)])
// This function produces Nb(Nr+1) round keys. The round keys are used in each round to decrypt the states.
static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key)
@ -308,6 +303,14 @@ static void MixColumns(state_t* state)
}
#if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
/*
static uint8_t getSBoxInvert(uint8_t num)
{
return rsbox[num];
}
*/
#define getSBoxInvert(num) (rsbox[(num)])
// MixColumns function mixes the columns of the state matrix.
// The method used to multiply may be difficult to understand for the inexperienced.
// Please use the references to gain more information.
@ -479,9 +482,9 @@ static void XorWithIv(uint8_t* buf, const uint8_t* Iv)
}
}
void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t* buf, uint32_t length)
void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t* buf, size_t length)
{
uintptr_t i;
size_t i;
uint8_t *Iv = ctx->Iv;
for (i = 0; i < length; i += AES_BLOCKLEN)
{
@ -489,15 +492,14 @@ void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t* buf, uint32_t length)
Cipher((state_t*)buf, ctx->RoundKey);
Iv = buf;
buf += AES_BLOCKLEN;
//printf("Step %d - %d", i/16, i);
}
/* store Iv in ctx for next call */
memcpy(ctx->Iv, Iv, AES_BLOCKLEN);
}
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length)
{
uintptr_t i;
size_t i;
uint8_t storeNextIv[AES_BLOCKLEN];
for (i = 0; i < length; i += AES_BLOCKLEN)
{
@ -517,11 +519,11 @@ void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
#if defined(CTR) && (CTR == 1)
/* Symmetrical operation: same function for encrypting as for decrypting. Note any IV/nonce should never be reused with the same key */
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length)
{
uint8_t buffer[AES_BLOCKLEN];
unsigned i;
size_t i;
int bi;
for (i = 0, bi = AES_BLOCKLEN; i < length; ++i, ++bi)
{

11
aes.h
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@ -2,6 +2,7 @@
#define _AES_H_
#include <stdint.h>
#include <stddef.h>
// #define the macros below to 1/0 to enable/disable the mode of operation.
//
@ -27,7 +28,7 @@
//#define AES192 1
//#define AES256 1
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
#if defined(AES256) && (AES256 == 1)
#define AES_KEYLEN 32
@ -69,8 +70,8 @@ void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
// no IV should ever be reused with the same key
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
#endif // #if defined(CBC) && (CBC == 1)
@ -82,9 +83,9 @@ void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
// Suggesting https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
// NOTES: you need to set IV in ctx with AES_init_ctx_iv() or AES_ctx_set_iv()
// no IV should ever be reused with the same key
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
#endif // #if defined(CTR) && (CTR == 1)
#endif //_AES_H_
#endif // _AES_H_

28
library.json
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@ -1,13 +1,19 @@
{
"name": "tiny-AES-c",
"keywords": "cryptography, aes",
"description": "Small portable AES128/192/256 in C",
"repository":
{
"type": "git",
"url": "https://github.com/kokke/tiny-AES-c.git"
},
"frameworks": "*",
"platforms": "*",
"examples": "test.c"
"version": "1.0.0",
"name": "tiny-AES-c",
"keywords": "cryptography, aes",
"description": "Small portable AES128/192/256 in C",
"repository":
{
"type": "git",
"branch": "master",
"url": "https://github.com/kokke/tiny-AES-c.git"
},
"frameworks": "*",
"platforms": "*",
"examples": "test.c",
"build":
{
"srcFilter": "+<*> -<.git/> -<test.c> -<test.cpp> -<test_package/>"
}
}