add mnemonic conversion for c-bindings

bindings/ergo-lib-c-core/src/lib.rs

@@ -41,5 +41,6 @@ pub use crate::error::*;
 pub mod derivation_path;
 mod error;
 pub mod ext_pub_key;
+pub mod mnemonic;
 #[cfg(feature = "rest")]
 pub mod rest;

bindings/ergo-lib-c-core/src/mnemonic.rs

@@ -0,0 +1,15 @@
+use crate::Error;
+use ergo_lib::ergotree_interpreter::sigma_protocol::private_input::DlogProverInput;
+use ergo_lib::wallet::mnemonic::Mnemonic as InnerMnemonic;
+
+/// Convert a mnemonic phrase into a mnemonic seed
+/// mnemonic_pass is optional and is used to salt the seed
+pub unsafe fn mnemonic_to_seed(
+    mnemonic_phrase: &str,
+    mnemonic_pass: &str,
+    output: *mut u8,
+) -> Result<(), Error> {
+    let src: Vec<u8> = InnerMnemonic::to_seed(mnemonic_phrase, mnemonic_pass).into();
+    std::ptr::copy_nonoverlapping(src.as_ptr(), output, DlogProverInput::SIZE_BYTES);
+    Ok(())
+}

bindings/ergo-lib-c/src/lib.rs

@@ -40,6 +40,7 @@ mod rest;
 
 mod derivation_path;
 mod ext_pub_key;
+mod mnemonic;
 mod secret_key;
 mod token;
 mod transaction;

bindings/ergo-lib-c/src/mnemonic.rs

@@ -0,0 +1,17 @@
+use ergo_lib_c_core::mnemonic::mnemonic_to_seed;
+use std::ffi::CStr;
+use std::os::raw::c_char;
+
+/// Convert a mnemonic phrase into a mnemonic seed
+/// mnemonic_pass is optional and is used to salt the seed
+#[no_mangle]
+pub unsafe extern "C" fn ergo_lib_mnemonic_to_seed(
+    mnemonic_phrase: *const c_char,
+    mnemonic_pass: *const c_char,
+    output: *mut u8,
+) {
+    let mnemonic_phrase = CStr::from_ptr(mnemonic_phrase).to_string_lossy();
+    let mnemonic_pass = CStr::from_ptr(mnemonic_pass).to_string_lossy();
+    #[allow(clippy::unwrap_used)]
+    mnemonic_to_seed(&mnemonic_phrase, &mnemonic_pass, output).unwrap()
+}