Experimental library wraps libsodium C sources and libsodium.js, offering a multiplatform wrapper for cryptographic functions. Emphasizes authenticated encryption, secret streams, and error handling, closely mirroring original libsodium API while adapting to Kotlin standards.
Surfaced from shared tags and platforms — no rankings paid for.
[!CAUTION] Experimental library!
Libsodium bindings project uses libsodium c sources and libsodium.js to provide a kotlin multiplatform wrapper library for libsodium. The library is feature complete and usable.
While this library is just a wrapper around the well known Libsodium library it still comes with high potential of introducing new attack surfaces, bugs and other issues and you shouldn't use it in production until it has been reviewed by community.
We do not accept AI (LLM) generated or AI (LLM) assisted contributions at this time.
implementation("com.ionspin.kotlin:multiplatform-crypto-libsodium-bindings:0.9.5")
repositories {
maven("https://central.sonatype.com/repository/maven-snapshots/")
}
implementation("com.ionspin.kotlin:multiplatform-crypto-libsodium-bindings:0.9.6-SNAPSHOT")
Before using the wrapper you need to initialize the underlying libsodium library. You can use either a callback or coroutines approach
LibsodiumInitializer.initializeWithCallback {
// Libsodium initialized
}
suspend fun initalizeProject() {
...
LibsodiumInitializer.intialize()
...
}
After intiailization you can call libsodium functions directly
The API is very close to libsodium but still adapted to kotlin standards, as an example here is the usage of authenticated encryption api:
libsodium:
#define MESSAGE ((const unsigned char *) "test")
# MESSAGE_LEN 4
key[crypto_secretbox_KEYBYTES];
nonce[crypto_secretbox_NONCEBYTES];
ciphertext[];
crypto_secretbox_keygen(key);
randombytes_buf(nonce, nonce);
crypto_secretbox_easy(ciphertext, MESSAGE, MESSAGE_LEN, nonce, key);
decrypted[MESSAGE_LEN];
(crypto_secretbox_open_easy(decrypted, ciphertext, , nonce, key) != ) {
}
kotlin:
val message = ("Ladies and Gentlemen of the class of '99: If I could offer you " +
"only one tip for the future, sunscreen would be it.").encodeToUByteArray()
val key = LibsodiumRandom.buf(32)
val nonce = LibsodiumRandom.buf(24)
val encrypted = SecretBox.easy(message, nonce, key)
val decrypted = SecretBox.openEasy(encrypted, nonce, key)
If message cannot be verified, openEasy function will throw a SecretBoxCorruptedOrTamperedDataExceptionOrInvalidKey
In some cases libsodium C api returns two values, usually encrypted data and a autogenerated nonce. In situations like those, kotlin API returns a data class wrapping both objects. An example of this behavior is initializing the secret stream, where initialization funciton returns both the header and state:
libsodium:
crypto_secretstream_xchacha20poly1305_state state;
unsigned char key[crypto_secretstream_xchacha20poly1305_KEYBYTES];
unsigned char header[crypto_secretstream_xchacha20poly1305_HEADERBYTES];
/* Set up a new stream: initialize the state and create the header */
crypto_secretstream_xchacha20poly1305_init_push(&state, header, key);
kotlin: This is what the response data class definition looks like:
data class SecretStreamStateAndHeader(val state: SecretStreamState, val header : UByteArray)
And here is the usage sample
val key = LibsodiumRandom.buf(crypto_secretstream_xchacha20poly1305_KEYBYTES)
val stateAndHeader = SecretStream.xChaCha20Poly1305InitPush(key)
val state = stateAndHeader.state
val header = stateAndHeader.header
If a libsodium call fails, xChaCha20Poly1305InitPush function will throw a GeneralLibsodiumException.
The functions are mapped from libsodium to kotiln objects, so crypto_secretstream_xchacha20poly1305_init_push becomes
SecretStream.xChaCha20Poly1305InitPush
At the moment you should refer to original libsodium documentation for instructions on how to use the library
Currently supported native platforms (Apple Silicon is supported since 0.8.5) :
List of supported bindings (outdated)
Android .so files come from running dist-build scripts in libsodium which you can find in the libsodium submodule Java Linux Arm/X86_64 and Mac so and dylib are the same as produced by multiplatform builds, also based on the same submodule commit Java Windows dll is from https://download.libsodium.org/libsodium/releases/libsodium-1.0.19-stable-msvc.zip Javascript is from libsodium-wrappers-sumo npm package version 0.7.13 (https://github.com/jedisct1/libsodium.js)
Clone the git, init the submodule and run ./gradlew build. Note that current build settings are such that only linux builds js target.
pacman update executedA personal audit of version 0.9.2 was done by Renee Vandervelde, you can find it here https://reneevandervelde.com/publications/expect-fun/audit-ionspin-kmp-libsodium.html
Thanks Renee!
| Platform | Supported |
|---|
| Linux X86 64 | :heavy_check_mark: |
| Linux Arm 64 | :heavy_check_mark: |
| macOS X86 64 | :heavy_check_mark: |
| macOS Arm 64 (Apple Silicon) | :heavy_check_mark: |
| iOS x86 64 | :heavy_check_mark: |
| iOS Arm 64 | :heavy_check_mark: |
| iOS Simulator Arm 64 (Apple Silicon) | :heavy_check_mark: |
| watchOS Arm 32 | :heavy_check_mark: |
| watchOS Simulator Arm 64 (Apple Silicon) | :heavy_check_mark: |
| tvOS X86 64 | :heavy_check_mark: |
| tvOS Arm 64 | :heavy_check_mark: |
| tvOS Simulator Arm 64 (Apple Silicon) | :heavy_check_mark: |
| minGW X86 64 | :heavy_check_mark: |