Add Wycheproof ECDSA p256 test vectors (#313)

Created from:
https://github.com/google/wycheproof/blob/2196000605e45d91097147c9c71f26b72af58003/testvectors/ecdsa_secp256r1_sha256_test.json

Author: daviddrysdale

Cargo.lock

@@ -28,6 +28,7 @@ default-features = false
 features = ["der"]
 
 [dev-dependencies]
+blobby = "0.3"
 ecdsa-core = { version = "=0.11.0-pre.2", package = "ecdsa", default-features = false, features = ["dev"] }
 hex-literal = "0.3"
 proptest = "1.0"

p256/Cargo.toml

@@ -179,4 +179,9 @@ mod tests {
         use crate::{test_vectors::ecdsa::ECDSA_TEST_VECTORS, NistP256};
         ecdsa_core::new_verification_test!(NistP256, ECDSA_TEST_VECTORS);
     }
+
+    mod wycheproof {
+        use crate::NistP256;
+        ecdsa_core::new_wycheproof_test!(wycheproof, "wycheproof", NistP256);
+    }
 }