1 files changed, 27 insertions, 0 deletions
diff --git a/guests/rsa/src/lib.rs b/guests/rsa/src/lib.rs
new file mode 100644
index 0000000..b2067cf
--- /dev/null
+++ b/guests/rsa/src/lib.rs
@@ -0,0 +1,27 @@
+#![cfg_attr(feature = "no_std", no_std)]
+
+#[cfg(feature = "no_std")]
+extern crate alloc;
+#[cfg(feature = "no_std")]
+use alloc::vec::Vec;
+
+use sha2::{Digest, Sha256};
+
+#[cfg(feature = "sp1")]
+use rsa_sp1::{pkcs8::DecodePublicKey, Pkcs1v15Sign, RsaPublicKey};
+
+#[cfg(not(feature = "sp1"))]
+use rsa::{pkcs8::DecodePublicKey, Pkcs1v15Sign, RsaPublicKey};
+
+#[guests_macro::proving_entrypoint]
+pub fn main(public_key: Vec<u8>, message: String, signature: Vec<u8>) -> bool {
+    let public_key = RsaPublicKey::from_public_key_der(&public_key).unwrap();
+
+    let mut hasher = Sha256::new();
+    hasher.update(message);
+    let hashed_msg = hasher.finalize();
+
+    public_key
+        .verify(Pkcs1v15Sign::new::<Sha256>(), &hashed_msg, &signature)
+        .is_ok()
+}