diff --git a/Cargo.toml b/Cargo.toml
index 70b82d0f..d5638ad5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,8 @@ crate-type = ["lib", "cdylib"]
 normal = ["openssl-src"]
 
 [dependencies]
-c2pa = {version = "0.40.0", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
+c2pa = { version = "0.41.1", features = ["unstable_api", "file_io", "openssl", "pdf", "fetch_remote_manifests"]}
+c2pa-crypto = {version = "0.3.1" }
 thiserror = "1.0.49"
 uniffi = "0.28.2"
 openssl-src = "=300.3.1" # Required for openssl-sys
diff --git a/requirements.txt b/requirements.txt
index c4f07d43..c5eb6d9a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 maturin==1.7.4
 uniffi-bindgen==0.28.0
-cryptography==43.0.1
\ No newline at end of file
+cryptography==44.0.0
+pytest==8.3.4
\ No newline at end of file
diff --git a/src/callback_signer.rs b/src/callback_signer.rs
index 4be2d3ea..a033dc02 100644
--- a/src/callback_signer.rs
+++ b/src/callback_signer.rs
@@ -11,6 +11,8 @@
 // each license.
 
 use c2pa::{Signer, SigningAlg};
+// RawSigner is currently used only fully qualified
+use c2pa_crypto::{raw_signature::RawSignerError, time_stamp::TimeStampProvider};
 use log::debug;
 
 use crate::Result;
@@ -34,6 +36,41 @@ 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::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,
+            SigningAlg::Es256 => c2pa_crypto::raw_signature::SigningAlg::Es256,
+        }
+    }
+
+    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
@@ -57,6 +94,10 @@ impl Signer for RemoteSigner {
     fn direct_cose_handling(&self) -> bool {
         true
     }
+
+    fn raw_signer(&self) -> Box<&dyn c2pa_crypto::raw_signature::RawSigner> {
+        Box::new(self)
+    }
 }
 
 impl CallbackSigner {