WIP

Author: tmathern

Cargo.toml

@@ -12,7 +12,7 @@ crate-type = ["lib", "cdylib"]
 normal = ["openssl-src"]
 
 [dependencies]
-c2pa = {version = "0.41.0", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
+c2pa = { git = "https://github.com/contentauth/c2pa-rs.git", branch="mathern/python-tradeoffs", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
 c2pa-crypto = {version = "0.3.0" }
 thiserror = "1.0.49"
 uniffi = "0.28.2"

src/callback_signer.rs

@@ -11,7 +11,10 @@
 // each license.
 
 use c2pa::{Signer, SigningAlg};
-use c2pa_crypto::raw_signature::RawSigner;
+use c2pa_crypto::{
+  raw_signature::{RawSigner, RawSignerError},
+  time_stamp::TimeStampProvider,
+};
 use log::debug;
 
 use crate::Result;
@@ -35,6 +38,46 @@ pub struct RemoteSigner {
     reserve_size: u32,
 }
 
+impl TimeStampProvider for RemoteSigner {}
+
+impl c2pa_crypto::raw_signature::RawSigner for RemoteSigner {
+    fn sign(
+        &self,
+        data: &[u8],
+    ) -> std::result::Result<Vec<u8>, RawSignerError> {
+        let signature_result = self.signer_callback.sign(data.to_vec());
+
+        match signature_result {
+            Ok(signature) => Ok(signature),
+            Err(e) => Err(c2pa_crypto::raw_signature::RawSignerError::IoError(
+                e.to_string(),
+            )),
+        }
+    }
+
+    fn alg(&self) -> c2pa_crypto::raw_signature::SigningAlg {
+        match self.alg {
+            SigningAlg::Es256 => c2pa_crypto::raw_signature::SigningAlg::Es256,
+            SigningAlg::Es384 => c2pa_crypto::raw_signature::SigningAlg::Es384,
+            SigningAlg::Es512 => c2pa_crypto::raw_signature::SigningAlg::Es512,
+            SigningAlg::Ps256 => c2pa_crypto::raw_signature::SigningAlg::Ps256,
+            SigningAlg::Ps384 => c2pa_crypto::raw_signature::SigningAlg::Ps384,
+            SigningAlg::Ps512 => c2pa_crypto::raw_signature::SigningAlg::Ps512,
+            SigningAlg::Ed25519 => c2pa_crypto::raw_signature::SigningAlg::Ed25519,
+        }
+    }
+
+    fn cert_chain(
+        &self,
+    ) -> std::result::Result<Vec<Vec<u8>>, RawSignerError> {
+        Ok(Vec::new())
+    }
+
+    fn reserve_size(&self) -> usize {
+        self.reserve_size as usize
+    }
+}
+
 impl Signer for RemoteSigner {
     fn sign(&self, data: &[u8]) -> c2pa::Result<Vec<u8>> {
         self.signer_callback