crypter ffi bindings for kotlin

Cargo.toml

@@ -10,7 +10,8 @@ members = [
 
 exclude = [
     "sphinx-key",
-    "crypter"
+    "crypter",
+    "crypter-ffi"
 ]
 
 [patch.crates-io]

crypter-ffi/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "crypter-ffi"
+version = "0.1.0"
+authors = ["Evan Feenstra <evanfeenstra@gmail.com>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+name = "crypter"
+
+[dependencies]
+sphinx-key-crypter = { path = "../crypter" }
+uniffi = "0.19.2"
+hex = "0.4.3"
+thiserror = "1.0.31"
+uniffi_macros = "0.11.0"
+
+[build-dependencies]
+uniffi_build = "0.19.2"
+
+[patch.crates-io]
+getrandom = { version = "0.2", git = "https://github.com/esp-rs-compat/getrandom.git" }
+secp256k1 = { git = "https://github.com/Evanfeenstra/rust-secp256k1", branch = "v0.22.0-new-rand" }
+lightning = { git = "https://github.com/Evanfeenstra/rust-lightning", branch = "v0.0.108-branch" }
+

crypter-ffi/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi_build::generate_scaffolding("./src/crypter.udl").unwrap();
+}

crypter-ffi/readme.md

@@ -0,0 +1,10 @@
+uniffi-bindgen --version
+should match the uniffi version in Cargo.toml
+
+uniffi-bindgen generate src/crypter.udl --language kotlin
+
+uniffi-bindgen generate src/crypter.udl --language swift
+
+### manually build the C ffi
+
+uniffi-bindgen scaffolding src/crypter.udl

crypter-ffi/src/crypter.udl

@@ -0,0 +1,19 @@
+[Error]
+enum CrypterError {
+  "DeriveSharedSecret",
+  "Encrypt",
+  "Decrypt",
+  "BadPubkey",
+  "BadSecret",
+  "BadNonce",
+  "BadCiper",
+};
+
+namespace crypter {
+  [Throws=CrypterError]
+  string derive_shared_secret(string their_pubkey, string my_secret_key);
+  [Throws=CrypterError]
+  string encrypt(string plaintext, string secret, string nonce);
+  [Throws=CrypterError]
+  string decrypt(string ciphertext, string secret);
+};

crypter-ffi/src/lib.rs

@@ -0,0 +1,98 @@
+mod parse;
+
+use sphinx_key_crypter::chacha::{decrypt as chacha_decrypt, encrypt as chacha_encrypt};
+use sphinx_key_crypter::ecdh::derive_shared_secret_from_slice;
+
+uniffi_macros::include_scaffolding!("crypter");
+
+pub type Result<T> = std::result::Result<T, CrypterError>;
+
+#[derive(Debug, thiserror::Error)]
+pub enum CrypterError {
+    #[error("Failed to derive shared secret")]
+    DeriveSharedSecret,
+    #[error("Failed to encrypt")]
+    Encrypt,
+    #[error("Failed to decrypt")]
+    Decrypt,
+    #[error("Bad pubkey")]
+    BadPubkey,
+    #[error("Bad secret")]
+    BadSecret,
+    #[error("Bad nonce")]
+    BadNonce,
+    #[error("Bad cipher")]
+    BadCiper,
+}
+
+// their_pubkey: 33 bytes
+// my_secret_key: 32 bytes
+// return shared secret: 32 bytes
+pub fn derive_shared_secret(their_pubkey: String, my_secret_key: String) -> Result<String> {
+    let pubkey = parse::parse_public_key_string(their_pubkey)?;
+    let secret_key = parse::parse_secret_string(my_secret_key)?;
+    let secret = match derive_shared_secret_from_slice(pubkey, secret_key) {
+        Ok(s) => s,
+        Err(_) => return Err(CrypterError::DeriveSharedSecret),
+    };
+    Ok(hex::encode(secret))
+}
+
+// plaintext: 32 bytes
+// secret: 32 bytes
+// nonce: 8 bytes
+// return ciphertext: 56 bytes
+pub fn encrypt(plaintext: String, secret: String, nonce: String) -> Result<String> {
+    let plain = parse::parse_secret_string(plaintext)?;
+    let sec = parse::parse_secret_string(secret)?;
+    let non = parse::parse_nonce_string(nonce)?;
+    let cipher = match chacha_encrypt(plain, sec, non) {
+        Ok(c) => c,
+        Err(_) => return Err(CrypterError::Encrypt),
+    };
+    Ok(hex::encode(cipher))
+}
+
+// ciphertext: 56 bytes
+// secret: 32 bytes
+// return plaintext: 32 bytes
+pub fn decrypt(ciphertext: String, secret: String) -> Result<String> {
+    let cipher = parse::parse_cipher_string(ciphertext)?;
+    let sec = parse::parse_secret_string(secret)?;
+    let plain = match chacha_decrypt(cipher, sec) {
+        Ok(c) => c,
+        Err(_) => return Err(CrypterError::Decrypt),
+    };
+    Ok(hex::encode(plain))
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{decrypt, derive_shared_secret, encrypt, Result};
+
+    #[test]
+    fn test_crypter() -> Result<()> {
+        let sk1 = "86c8977989592a97beb409bc27fde76e981ce3543499fd61743755b832e92a3e";
+        let pk1 = "0362a684901b8d065fb034bc44ea972619a409aeafc2a698016a74f6eee1008aca";
+
+        let sk2 = "21c2d41c7394b0a87dae89576bee2552aedb54a204cdcdbf5cdceb0b4c1c2a17";
+        let pk2 = "027dd6297aff570a409fe05032b6e1dab39f309daa8c438a65c32e3d7b4722b7c3";
+
+        // derive shared secrets
+        let sec1 = derive_shared_secret(pk2.to_string(), sk1.to_string())?;
+        let sec2 = derive_shared_secret(pk1.to_string(), sk2.to_string())?;
+        assert_eq!(sec1, sec2);
+
+        // encrypt plaintext with sec1
+        let plaintext = "59ff446bec1d96dc7d1a69232cd69ca409e069294e983df7f1e3e5fb3c95c41c";
+        let nonce = "0da01cc0c0a73ad3";
+        let cipher = encrypt(plaintext.to_string(), sec1, nonce.to_string())?;
+
+        // decrypt with sec2
+        let plain = decrypt(cipher, sec2)?;
+        assert_eq!(plaintext, plain);
+
+        println!("PLAINTEXT MATCHES!");
+        Ok(())
+    }
+}

crypter-ffi/src/parse.rs

@@ -0,0 +1,65 @@
+use crate::{Result, CrypterError};
+
+use sphinx_key_crypter::ecdh::PUBLIC_KEY_LEN;
+use sphinx_key_crypter::chacha::{NONCE_END_LEN, KEY_LEN, CIPHER_LEN};
+use std::convert::TryInto;
+
+pub(crate) fn parse_secret_string(sk: String) -> Result<[u8; KEY_LEN]> {
+    if sk.len() != KEY_LEN * 2 {
+        return Err(CrypterError::BadSecret)
+    }
+    let secret_key_bytes: Vec<u8> = match hex::decode(sk) {
+        Ok(sk) => sk,
+        Err(_) => return Err(CrypterError::BadSecret),
+    };
+    let secret_key: [u8; KEY_LEN] = match secret_key_bytes.try_into() {
+        Ok(sk) => sk,
+        Err(_) => return Err(CrypterError::BadSecret),
+    };
+    Ok(secret_key)
+}
+
+pub(crate) fn parse_public_key_string(pk: String) -> Result<[u8; PUBLIC_KEY_LEN]> {
+    if pk.len() != PUBLIC_KEY_LEN * 2 {
+        return Err(CrypterError::BadPubkey)
+    }
+    let pubkey_bytes: Vec<u8> = match hex::decode(pk) {
+        Ok(pk) => pk,
+        Err(_) => return Err(CrypterError::BadPubkey),
+    };
+    let pubkey: [u8; PUBLIC_KEY_LEN] = match pubkey_bytes.try_into() {
+        Ok(pk) => pk,
+        Err(_) => return Err(CrypterError::BadPubkey),
+    };
+    Ok(pubkey)
+}
+
+pub(crate) fn parse_nonce_string(n: String) -> Result<[u8; NONCE_END_LEN]> {
+    if n.len() != NONCE_END_LEN * 2 {
+        return Err(CrypterError::BadNonce)
+    }
+    let nonce_bytes: Vec<u8> = match hex::decode(n) {
+        Ok(n) => n,
+        Err(_) => return Err(CrypterError::BadNonce),
+    };
+    let nonce: [u8; NONCE_END_LEN] = match nonce_bytes.try_into() {
+        Ok(n) => n,
+        Err(_) => return Err(CrypterError::BadNonce),
+    };
+    Ok(nonce)
+}
+
+pub(crate) fn parse_cipher_string(c: String) -> Result<[u8; CIPHER_LEN]> {
+    if c.len() != CIPHER_LEN * 2 {
+        return Err(CrypterError::BadCiper)
+    }
+    let cipher_bytes: Vec<u8> = match hex::decode(c) {
+        Ok(n) => n,
+        Err(_) => return Err(CrypterError::BadCiper),
+    };
+    let cipher: [u8; CIPHER_LEN] = match cipher_bytes.try_into() {
+        Ok(n) => n,
+        Err(_) => return Err(CrypterError::BadCiper),
+    };
+    Ok(cipher)
+}

crypter-ffi/src/uniffi/crypter/crypter.kt

@@ -0,0 +1,419 @@
+// This file was autogenerated by some hot garbage in the `uniffi` crate.
+// Trust me, you don't want to mess with it!
+
+@file:Suppress("NAME_SHADOWING")
+
+package uniffi.crypter;
+
+// Common helper code.
+//
+// Ideally this would live in a separate .kt file where it can be unittested etc
+// in isolation, and perhaps even published as a re-useable package.
+//
+// However, it's important that the detils of how this helper code works (e.g. the
+// way that different builtin types are passed across the FFI) exactly match what's
+// expected by the Rust code on the other side of the interface. In practice right
+// now that means coming from the exact some version of `uniffi` that was used to
+// compile the Rust component. The easiest way to ensure this is to bundle the Kotlin
+// helpers directly inline like we're doing here.
+
+import com.sun.jna.Library
+import com.sun.jna.Native
+import com.sun.jna.Pointer
+import com.sun.jna.Structure
+import com.sun.jna.ptr.ByReference
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+
+// This is a helper for safely working with byte buffers returned from the Rust code.
+// A rust-owned buffer is represented by its capacity, its current length, and a
+// pointer to the underlying data.
+
+@Structure.FieldOrder("capacity", "len", "data")
+open class RustBuffer : Structure() {
+    @JvmField var capacity: Int = 0
+    @JvmField var len: Int = 0
+    @JvmField var data: Pointer? = null
+
+    class ByValue : RustBuffer(), Structure.ByValue
+    class ByReference : RustBuffer(), Structure.ByReference
+
+    companion object {
+        internal fun alloc(size: Int = 0) = rustCall() { status ->
+            _UniFFILib.INSTANCE.ffi_crypter_b428_rustbuffer_alloc(size, status).also {
+                if(it.data == null) {
+                   throw RuntimeException("RustBuffer.alloc() returned null data pointer (size=${size})")
+               }
+            }
+        }
+
+        internal fun free(buf: RustBuffer.ByValue) = rustCall() { status ->
+            _UniFFILib.INSTANCE.ffi_crypter_b428_rustbuffer_free(buf, status)
+        }
+    }
+
+    @Suppress("TooGenericExceptionThrown")
+    fun asByteBuffer() =
+        this.data?.getByteBuffer(0, this.len.toLong())?.also {
+            it.order(ByteOrder.BIG_ENDIAN)
+        }
+}
+
+/**
+ * The equivalent of the `*mut RustBuffer` type.
+ * Required for callbacks taking in an out pointer.
+ *
+ * Size is the sum of all values in the struct.
+ */
+class RustBufferByReference : ByReference(16) {
+    /**
+     * Set the pointed-to `RustBuffer` to the given value.
+     */
+    fun setValue(value: RustBuffer.ByValue) {
+        // NOTE: The offsets are as they are in the C-like struct.
+        val pointer = getPointer()
+        pointer.setInt(0, value.capacity)
+        pointer.setInt(4, value.len)
+        pointer.setPointer(8, value.data)
+    }
+}
+
+// This is a helper for safely passing byte references into the rust code.
+// It's not actually used at the moment, because there aren't many things that you
+// can take a direct pointer to in the JVM, and if we're going to copy something
+// then we might as well copy it into a `RustBuffer`. But it's here for API
+// completeness.
+
+@Structure.FieldOrder("len", "data")
+open class ForeignBytes : Structure() {
+    @JvmField var len: Int = 0
+    @JvmField var data: Pointer? = null
+
+    class ByValue : ForeignBytes(), Structure.ByValue
+}
+// The FfiConverter interface handles converter types to and from the FFI
+//
+// All implementing objects should be public to support external types.  When a
+// type is external we need to import it's FfiConverter.
+public interface FfiConverter<KotlinType, FfiType> {
+    // Convert an FFI type to a Kotlin type
+    fun lift(value: FfiType): KotlinType
+
+    // Convert an Kotlin type to an FFI type
+    fun lower(value: KotlinType): FfiType
+
+    // Read a Kotlin type from a `ByteBuffer`
+    fun read(buf: ByteBuffer): KotlinType
+
+    // Calculate bytes to allocate when creating a `RustBuffer`
+    //
+    // This must return at least as many bytes as the write() function will
+    // write. It can return more bytes than needed, for example when writing
+    // Strings we can't know the exact bytes needed until we the UTF-8
+    // encoding, so we pessimistically allocate the largest size possible (3
+    // bytes per codepoint).  Allocating extra bytes is not really a big deal
+    // because the `RustBuffer` is short-lived.
+    fun allocationSize(value: KotlinType): Int
+
+    // Write a Kotlin type to a `ByteBuffer`
+    fun write(value: KotlinType, buf: ByteBuffer)
+
+    // Lower a value into a `RustBuffer`
+    //
+    // This method lowers a value into a `RustBuffer` rather than the normal
+    // FfiType.  It's used by the callback interface code.  Callback interface
+    // returns are always serialized into a `RustBuffer` regardless of their
+    // normal FFI type.
+    fun lowerIntoRustBuffer(value: KotlinType): RustBuffer.ByValue {
+        val rbuf = RustBuffer.alloc(allocationSize(value))
+        try {
+            val bbuf = rbuf.data!!.getByteBuffer(0, rbuf.capacity.toLong()).also {
+                it.order(ByteOrder.BIG_ENDIAN)
+            }
+            write(value, bbuf)
+            rbuf.writeField("len", bbuf.position())
+            return rbuf
+        } catch (e: Throwable) {
+            RustBuffer.free(rbuf)
+            throw e
+        }
+    }
+
+    // Lift a value from a `RustBuffer`.
+    //
+    // This here mostly because of the symmetry with `lowerIntoRustBuffer()`.
+    // It's currently only used by the `FfiConverterRustBuffer` class below.
+    fun liftFromRustBuffer(rbuf: RustBuffer.ByValue): KotlinType {
+        val byteBuf = rbuf.asByteBuffer()!!
+        try {
+           val item = read(byteBuf)
+           if (byteBuf.hasRemaining()) {
+               throw RuntimeException("junk remaining in buffer after lifting, something is very wrong!!")
+           }
+           return item
+        } finally {
+            RustBuffer.free(rbuf)
+        }
+    }
+}
+
+// FfiConverter that uses `RustBuffer` as the FfiType
+public interface FfiConverterRustBuffer<KotlinType>: FfiConverter<KotlinType, RustBuffer.ByValue> {
+    override fun lift(value: RustBuffer.ByValue) = liftFromRustBuffer(value)
+    override fun lower(value: KotlinType) = lowerIntoRustBuffer(value)
+}
+// A handful of classes and functions to support the generated data structures.
+// This would be a good candidate for isolating in its own ffi-support lib.
+// Error runtime.
+@Structure.FieldOrder("code", "error_buf")
+internal open class RustCallStatus : Structure() {
+    @JvmField var code: Int = 0
+    @JvmField var error_buf: RustBuffer.ByValue = RustBuffer.ByValue()
+
+    fun isSuccess(): Boolean {
+        return code == 0
+    }
+
+    fun isError(): Boolean {
+        return code == 1
+    }
+
+    fun isPanic(): Boolean {
+        return code == 2
+    }
+}
+
+class InternalException(message: String) : Exception(message)
+
+// Each top-level error class has a companion object that can lift the error from the call status's rust buffer
+interface CallStatusErrorHandler<E> {
+    fun lift(error_buf: RustBuffer.ByValue): E;
+}
+
+// Helpers for calling Rust
+// In practice we usually need to be synchronized to call this safely, so it doesn't
+// synchronize itself
+
+// Call a rust function that returns a Result<>.  Pass in the Error class companion that corresponds to the Err
+private inline fun <U, E: Exception> rustCallWithError(errorHandler: CallStatusErrorHandler<E>, callback: (RustCallStatus) -> U): U {
+    var status = RustCallStatus();
+    val return_value = callback(status)
+    if (status.isSuccess()) {
+        return return_value
+    } else if (status.isError()) {
+        throw errorHandler.lift(status.error_buf)
+    } else if (status.isPanic()) {
+        // when the rust code sees a panic, it tries to construct a rustbuffer
+        // with the message.  but if that code panics, then it just sends back
+        // an empty buffer.
+        if (status.error_buf.len > 0) {
+            throw InternalException(FfiConverterString.lift(status.error_buf))
+        } else {
+            throw InternalException("Rust panic")
+        }
+    } else {
+        throw InternalException("Unknown rust call status: $status.code")
+    }
+}
+
+// CallStatusErrorHandler implementation for times when we don't expect a CALL_ERROR
+object NullCallStatusErrorHandler: CallStatusErrorHandler<InternalException> {
+    override fun lift(error_buf: RustBuffer.ByValue): InternalException {
+        RustBuffer.free(error_buf)
+        return InternalException("Unexpected CALL_ERROR")
+    }
+}
+
+// Call a rust function that returns a plain value
+private inline fun <U> rustCall(callback: (RustCallStatus) -> U): U {
+    return rustCallWithError(NullCallStatusErrorHandler, callback);
+}
+
+// Contains loading, initialization code,
+// and the FFI Function declarations in a com.sun.jna.Library.
+@Synchronized
+private fun findLibraryName(componentName: String): String {
+    val libOverride = System.getProperty("uniffi.component.$componentName.libraryOverride")
+    if (libOverride != null) {
+        return libOverride
+    }
+    return "uniffi_crypter"
+}
+
+private inline fun <reified Lib : Library> loadIndirect(
+    componentName: String
+): Lib {
+    return Native.load<Lib>(findLibraryName(componentName), Lib::class.java)
+}
+
+// A JNA Library to expose the extern-C FFI definitions.
+// This is an implementation detail which will be called internally by the public API.
+
+internal interface _UniFFILib : Library {
+    companion object {
+        internal val INSTANCE: _UniFFILib by lazy {
+            loadIndirect<_UniFFILib>(componentName = "crypter")
+            
+        }
+    }
+
+    fun crypter_b428_derive_shared_secret(`theirPubkey`: RustBuffer.ByValue,`mySecretKey`: RustBuffer.ByValue,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    fun crypter_b428_encrypt(`plaintext`: RustBuffer.ByValue,`secret`: RustBuffer.ByValue,`nonce`: RustBuffer.ByValue,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    fun crypter_b428_decrypt(`ciphertext`: RustBuffer.ByValue,`secret`: RustBuffer.ByValue,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    fun ffi_crypter_b428_rustbuffer_alloc(`size`: Int,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    fun ffi_crypter_b428_rustbuffer_from_bytes(`bytes`: ForeignBytes.ByValue,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    fun ffi_crypter_b428_rustbuffer_free(`buf`: RustBuffer.ByValue,
+    _uniffi_out_err: RustCallStatus
+    ): Unit
+
+    fun ffi_crypter_b428_rustbuffer_reserve(`buf`: RustBuffer.ByValue,`additional`: Int,
+    _uniffi_out_err: RustCallStatus
+    ): RustBuffer.ByValue
+
+    
+}
+
+// Public interface members begin here.
+
+
+public object FfiConverterString: FfiConverter<String, RustBuffer.ByValue> {
+    // Note: we don't inherit from FfiConverterRustBuffer, because we use a
+    // special encoding when lowering/lifting.  We can use `RustBuffer.len` to
+    // store our length and avoid writing it out to the buffer.
+    override fun lift(value: RustBuffer.ByValue): String {
+        try {
+            val byteArr = ByteArray(value.len)
+            value.asByteBuffer()!!.get(byteArr)
+            return byteArr.toString(Charsets.UTF_8)
+        } finally {
+            RustBuffer.free(value)
+        }
+    }
+
+    override fun read(buf: ByteBuffer): String {
+        val len = buf.getInt()
+        val byteArr = ByteArray(len)
+        buf.get(byteArr)
+        return byteArr.toString(Charsets.UTF_8)
+    }
+
+    override fun lower(value: String): RustBuffer.ByValue {
+        val byteArr = value.toByteArray(Charsets.UTF_8)
+        // Ideally we'd pass these bytes to `ffi_bytebuffer_from_bytes`, but doing so would require us
+        // to copy them into a JNA `Memory`. So we might as well directly copy them into a `RustBuffer`.
+        val rbuf = RustBuffer.alloc(byteArr.size)
+        rbuf.asByteBuffer()!!.put(byteArr)
+        return rbuf
+    }
+
+    // We aren't sure exactly how many bytes our string will be once it's UTF-8
+    // encoded.  Allocate 3 bytes per unicode codepoint which will always be
+    // enough.
+    override fun allocationSize(value: String): Int {
+        val sizeForLength = 4
+        val sizeForString = value.length * 3
+        return sizeForLength + sizeForString
+    }
+
+    override fun write(value: String, buf: ByteBuffer) {
+        val byteArr = value.toByteArray(Charsets.UTF_8)
+        buf.putInt(byteArr.size)
+        buf.put(byteArr)
+    }
+}
+
+
+
+
+
+sealed class CrypterException(message: String): Exception(message) {
+        // Each variant is a nested class
+        // Flat enums carries a string error message, so no special implementation is necessary.
+        class DeriveSharedSecret(message: String) : CrypterException(message)
+        class Encrypt(message: String) : CrypterException(message)
+        class Decrypt(message: String) : CrypterException(message)
+        class BadPubkey(message: String) : CrypterException(message)
+        class BadSecret(message: String) : CrypterException(message)
+        class BadNonce(message: String) : CrypterException(message)
+        class BadCiper(message: String) : CrypterException(message)
+        
+
+    companion object ErrorHandler : CallStatusErrorHandler<CrypterException> {
+        override fun lift(error_buf: RustBuffer.ByValue): CrypterException = FfiConverterTypeCrypterError.lift(error_buf)
+    }
+}
+
+public object FfiConverterTypeCrypterError : FfiConverterRustBuffer<CrypterException> {
+    override fun read(buf: ByteBuffer): CrypterException {
+        
+            return when(buf.getInt()) {
+            1 -> CrypterException.DeriveSharedSecret(FfiConverterString.read(buf))
+            2 -> CrypterException.Encrypt(FfiConverterString.read(buf))
+            3 -> CrypterException.Decrypt(FfiConverterString.read(buf))
+            4 -> CrypterException.BadPubkey(FfiConverterString.read(buf))
+            5 -> CrypterException.BadSecret(FfiConverterString.read(buf))
+            6 -> CrypterException.BadNonce(FfiConverterString.read(buf))
+            7 -> CrypterException.BadCiper(FfiConverterString.read(buf))
+            else -> throw RuntimeException("invalid error enum value, something is very wrong!!")
+        }
+        
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    override fun allocationSize(value: CrypterException): Int {
+        throw RuntimeException("Writing Errors is not supported")
+    }
+
+    @Suppress("UNUSED_PARAMETER")
+    override fun write(value: CrypterException, buf: ByteBuffer) {
+        throw RuntimeException("Writing Errors is not supported")
+    }
+
+}
+@Throws(CrypterException::class)
+
+fun `deriveSharedSecret`(`theirPubkey`: String, `mySecretKey`: String): String {
+    return FfiConverterString.lift(
+    rustCallWithError(CrypterException) { _status ->
+    _UniFFILib.INSTANCE.crypter_b428_derive_shared_secret(FfiConverterString.lower(`theirPubkey`), FfiConverterString.lower(`mySecretKey`), _status)
+})
+}
+
+
+@Throws(CrypterException::class)
+
+fun `encrypt`(`plaintext`: String, `secret`: String, `nonce`: String): String {
+    return FfiConverterString.lift(
+    rustCallWithError(CrypterException) { _status ->
+    _UniFFILib.INSTANCE.crypter_b428_encrypt(FfiConverterString.lower(`plaintext`), FfiConverterString.lower(`secret`), FfiConverterString.lower(`nonce`), _status)
+})
+}
+
+
+@Throws(CrypterException::class)
+
+fun `decrypt`(`ciphertext`: String, `secret`: String): String {
+    return FfiConverterString.lift(
+    rustCallWithError(CrypterException) { _status ->
+    _UniFFILib.INSTANCE.crypter_b428_decrypt(FfiConverterString.lower(`ciphertext`), FfiConverterString.lower(`secret`), _status)
+})
+}
+
+
+
+

crypter/Cargo.toml

@@ -5,17 +5,17 @@ authors = ["Evan Feenstra <evanfeenstra@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-rand = "0.8"
 anyhow = {version = "1", features = ["backtrace"]}
-log = "0.4"
-base64 = { version = "0.13.0" }
 secp256k1 = { version = "0.22.0", features = ["std", "rand-std"] }
+rand = "0.8.5"
 
 [dependencies.lightning]
 version = "0.0.108"
 default-features = false
 features = ["std", "grind_signatures"]
 
+# [dev-dependencies]
+
 [patch.crates-io]
 getrandom = { version = "0.2", git = "https://github.com/esp-rs-compat/getrandom.git" }
 secp256k1 = { git = "https://github.com/Evanfeenstra/rust-secp256k1", branch = "v0.22.0-new-rand" }