Add ecdsa module to openvm_p256

Author: Avaneesh-axiom

guest-libs/p256/guest/Cargo.toml

@@ -21,6 +21,22 @@ ecdsa = { workspace = true }
 serde = { workspace = true }
 hex-literal = { workspace = true }
 ff = { workspace = true }
+<<<<<<< Updated upstream
+=======
+<<<<<<< Updated upstream
+=======
+>>>>>>> Stashed changes
+p256 = { workspace = true }
+
+[features]
+default = ["ecdsa"]
+<<<<<<< Updated upstream
+ecdsa = ["p256/ecdsa"]
+=======
+ecdsa = ["p256/ecdsa", "ecdsa-core"]
+ecdsa-core = ["p256/ecdsa-core"]
+>>>>>>> Stashed changes
+>>>>>>> Stashed changes
 
 [target.'cfg(not(target_os = "zkvm"))'.dependencies]
 num-bigint = { workspace = true }

guest-libs/p256/guest/src/ecdsa.rs

@@ -0,0 +1,14 @@
+// re-export types that are visible in the p256 crate for API compatibility
+
+pub use p256::ecdsa::Error;
+
+/// ECDSA/secp256k1 signature (fixed-size)
+pub type Signature = ecdsa::Signature<crate::P256>;
+
+/// ECDSA/secp256k1 signing key
+#[cfg(feature = "ecdsa")]
+pub type SigningKey = ecdsa::SigningKey<crate::P256>;
+
+/// ECDSA/secp256k1 verification key (i.e. public key)
+#[cfg(feature = "ecdsa")]
+pub type VerifyingKey = ecdsa::VerifyingKey<crate::P256>;

guest-libs/p256/guest/src/lib.rs

@@ -13,6 +13,17 @@ mod internal;
 mod point;
 mod scalar;
 
+<<<<<<< Updated upstream
+pub mod ecdsa;
+
+=======
+<<<<<<< Updated upstream
+=======
+#[cfg(feature = "ecdsa-core")]
+pub mod ecdsa;
+
+>>>>>>> Stashed changes
+>>>>>>> Stashed changes
 // Needs to be public so that the `sw_init` macro can access it
 pub use internal::{
     P256Point, P256Point as AffinePoint, P256Point as ProjectivePoint, P256Scalar as Scalar,