https://github.com/maroontress/mimicssl-aes128-cbc-decrypt
This is an AES-128 CBC implementation in C23 only for decrypting, and its API is compatible with OpenSSL 1.1.
https://github.com/maroontress/mimicssl-aes128-cbc-decrypt
aes-128-cbc pkcs7
Last synced: 2 days ago
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This is an AES-128 CBC implementation in C23 only for decrypting, and its API is compatible with OpenSSL 1.1.
- Host: GitHub
- URL: https://github.com/maroontress/mimicssl-aes128-cbc-decrypt
- Owner: maroontress
- License: other
- Created: 2023-08-02T12:14:31.000Z (about 2 years ago)
- Default Branch: main
- Last Pushed: 2024-09-09T15:56:37.000Z (about 1 year ago)
- Last Synced: 2025-04-05T19:24:31.929Z (7 months ago)
- Topics: aes-128-cbc, pkcs7
- Language: C++
- Homepage:
- Size: 48.8 KB
- Stars: 2
- Watchers: 1
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# MimicSSL-AES128-CBC-DECRYPT
This is an [AES][wikipedia::aes]-128 CBC implementation in C23 only for
decrypting, and its API is compatible with
[OpenSSL 1.1][openssl::EVP_DecryptInit_ex]. See [FIPS PUB 197][fips::197] for
the AES specifications.
Note that the current implementation works only on little-endian platforms.
## Example
An example usage would be as follows:
```c
int decrypt(FILE *in, FILE *out)
{
unsigned char inbuf[1024], outbuf[1024];
int inlen, outlen;
EVP_CIPHER_CTX *ctx;
unsigned char key[] = "0123456789abcdeF";
unsigned char iv[] = "1234567887654321";
if ((ctx = EVP_CIPHER_CTX_new()) == NULL) {
return 0;
}
if (!EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv)) {
EVP_CIPHER_CTX_free(ctx);
return 0;
}
for (;;) {
inlen = fread(inbuf, 1, 1024, in);
if (inlen <= 0) {
break;
}
if (!EVP_DecryptUpdate(ctx, outbuf, &outlen, inbuf, inlen)) {
EVP_CIPHER_CTX_free(ctx);
return 0;
}
fwrite(outbuf, 1, outlen, out);
}
if (!EVP_DecryptFinal_ex(ctx, outbuf, &outlen)) {
EVP_CIPHER_CTX_free(ctx);
return 0;
}
if (outlen > 0) {
fwrite(outbuf, 1, outlen, out);
}
EVP_CIPHER_CTX_free(ctx);
return 1;
}
```
## Build
This repository uses [lighter][maroontress::lighter] for testing as a submodule
of Git. So clone it as follows:
```plaintext
git clone --recursive URL
```
Then build the library on macOS or Linux as follows:
```textplain
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build
ctest --test-dir build
cmake --install build --prefix=/path/to/dir
```
Or on Windows as follows:
```textplain
cmake -S . -B build
cmake --build build --config Release
ctest --test-dir build -C Release
cmake --install build --config Release --prefix=/path/to/dir
```
## Build for Android
Set environment variables `ANDROID_HOME` and `ANDROID_NDK` appropriately. For
example:
```sh
export ANDROID_HOME=/usr/local/lib/android/sdk
export ANDROID_NDK=$ANDROID_HOME/ndk/25.2.9519653
```
Note that the value of `ANDROID_HOME` will vary depending on your environment,
but a typical configuration would be as follows:
- Windows: `C:\\Users\\USERNAME\\AppData\\Local\\Android\\sdk`
- Linux: `/home/USERNAME/Android/Sdk`
- macOS: `/Users/USERNAME/Library/Android/sdk`
Then build the library as follows:
```sh
abi=ABI
build_dir=BUILD_DIR
sh android.sh $build_dir configure $abi -G Ninja \
-DCMAKE_MAKE_PROGRAM="/path/to/ninja" \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX:PATH="/path/to/dir"
cmake --build $build_dir/$abi -v
cmake --install $build_dir/$abi
```
`ABI` should be replaced by `arm64-v8a`, `armeabi-v7a`, `x86`, or `x86_64`.
`BUILD_DIR` should be replaced by the build directory (e.g., `build-android`).
Note that `ninja` is required on Windows.
Before running `testsuite`, start Android Emulator as follows:
```sh
$ANDROID_HOME/emulator/emulator -avd AVD_NAME -no-snapshot
```
`AVD_NAME` should be replaced by the AVD name. Note that You can get the list of
AVD names as follows:
```sh
$ANDROID_HOME/emulator/emulator -list-avds
```
Then run `testusite` as follows:
```sh
sh android.sh $build_dir test $abi
```
## Build for iOS
Build the library on macOS as follows:
```sh
build_dir=BUILD_DIR
sh ios.sh $build_dir configure
sh ios.sh $build_dir build --config Release
sh ios.sh $build_dir install /path/to/dir --config Release
```
`BUILD_DIR` should be replaced by the build directory (e.g., `build-ios`).
You can run `testsuite` with the iPhone simulator as follows:
```sh
sh ios.sh $build_dir test ARCH -C Release
```
`ARCH` should be replaced by `arm64` or `x86_64`. Note that `jq` is required to
run the iPhone simulator.
[wikipedia::aes]: https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
[openssl::EVP_DecryptInit_ex]: https://www.openssl.org/docs/man1.1.1/man3/EVP_DecryptInit_ex.html
[fips::197]: https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.197.pdf
[maroontress::lighter]: https://github.com/maroontress/lighter