example

Author: mitschabaude

src/examples/crypto/ecdsa/ecdsa.ts

@@ -5,6 +5,7 @@ import {
   createForeignCurve,
   Bool,
   Bytes,
+  Hash,
 } from 'o1js';
 
 export { keccakAndEcdsa, ecdsa, Secp256k1, Ecdsa, Bytes32, ecdsaEthers };
@@ -62,3 +63,24 @@ const ecdsaEthers = ZkProgram({
     },
   },
 });
+
+/**
+ * We can also use a different hash function with ECDSA, like SHA-256.
+ */
+const sha256AndEcdsa = ZkProgram({
+  name: 'ecdsa',
+  publicInput: Bytes32,
+  publicOutput: Bool,
+
+  methods: {
+    verifyEcdsa: {
+      privateInputs: [Ecdsa, Secp256k1],
+      async method(message: Bytes32, signature: Ecdsa, publicKey: Secp256k1) {
+        let messageHash = Hash.SHA2_256.hash(message);
+        return {
+          publicOutput: signature.verifySignedHash(messageHash, publicKey),
+        };
+      },
+    },
+  },
+});