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feat: implement crypto_box_beforenm function #83

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feat: implement crypto_box_beforenm function #83

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43 changes: 43 additions & 0 deletions cpp/react-native-libsodium.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1122,6 +1122,49 @@ namespace ReactNativeLibsodium

jsiRuntime.global().setProperty(jsiRuntime, "jsi_crypto_box_seal_open", std::move(jsi_crypto_box_seal_open));

auto jsi_crypto_box_beforenm = jsi::Function::createFromHostFunction(
jsiRuntime,
jsi::PropNameID::forUtf8(jsiRuntime, "jsi_crypto_box_beforenm"),
2,
[](jsi::Runtime &runtime, const jsi::Value &thisValue, const jsi::Value *arguments, size_t count) -> jsi::Value
{
const std::string functionName = "crypto_box_beforenm";

std::string publicKeyArgumentName = "publicKey";
unsigned int publicKeyArgumentPosition = 0;
JsiArgType publicKeyArgType = validateIsStringOrArrayBuffer(functionName, runtime, arguments[publicKeyArgumentPosition], publicKeyArgumentName, true);

std::string privateKeyArgumentName = "privateKey";
unsigned int privateKeyArgumentPosition = 1;
JsiArgType privateKeyArgType = validateIsStringOrArrayBuffer(functionName, runtime, arguments[privateKeyArgumentPosition], privateKeyArgumentName, true);

auto publicKey = arguments[publicKeyArgumentPosition].asObject(runtime).getArrayBuffer(runtime);
auto privateKey = arguments[privateKeyArgumentPosition].asObject(runtime).getArrayBuffer(runtime);

if (publicKey.length(runtime) != crypto_box_PUBLICKEYBYTES)
{
throw jsi::JSError(runtime, "invalid publicKey length");
}

if (privateKey.length(runtime) != crypto_box_SECRETKEYBYTES)
{
throw jsi::JSError(runtime, "invalid privateKey length");
}

// Allocate memory for the shared secret
std::vector<uint8_t> sharedSecret(crypto_box_BEFORENMBYTES);

int result = crypto_box_beforenm(
sharedSecret.data(),
publicKey.data(runtime),
privateKey.data(runtime));

throwOnBadResult(functionName, runtime, result);
return arrayBufferAsObject(runtime, sharedSecret);
});

jsiRuntime.global().setProperty(jsiRuntime, "jsi_crypto_box_beforenm", std::move(jsi_crypto_box_beforenm));

auto jsi_crypto_pwhash = jsi::Function::createFromHostFunction(
jsiRuntime,
jsi::PropNameID::forUtf8(jsiRuntime, "jsi_crypto_pwhash"),
Expand Down
12 changes: 12 additions & 0 deletions src/lib.native.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,10 @@ declare global {
publicKey: ArrayBuffer,
secretKey: ArrayBuffer
): ArrayBuffer;
function jsi_crypto_box_beforenm(
message: ArrayBuffer,
publicKey: ArrayBuffer
): ArrayBuffer;
function jsi_crypto_generichash(
hashLength: number,
message: string | ArrayBuffer,
Expand Down Expand Up @@ -621,6 +625,13 @@ export function crypto_box_seal_open(
return convertToOutputFormat(result, outputFormat);
}

export function crypto_box_beforenm(
publicKey: Uint8Array,
privateKey: Uint8Array
) {
return global.jsi_crypto_box_beforenm(publicKey.buffer, privateKey.buffer);
}

export function crypto_generichash(
hash_length: number,
message: string | Uint8Array,
Expand Down Expand Up @@ -860,6 +871,7 @@ export default {
crypto_box_open_easy,
crypto_box_PUBLICKEYBYTES,
crypto_box_SECRETKEYBYTES,
crypto_box_beforenm,
crypto_generichash,
crypto_generichash_BYTES,
crypto_generichash_BYTES_MIN,
Expand Down