Fix signature size

yarn-project/aztec.js/src/account/contract/ecdsa_account_contract.ts

@@ -32,7 +32,7 @@ class EcdsaAuthWitnessProvider implements AuthWitnessProvider {
 
   async createAuthWitness(message: Fr): Promise<AuthWitness> {
     const ecdsa = await Ecdsa.new();
-    const signature = ecdsa.constructSignature(message.toBuffer(), this.signingPrivateKey).toFields();
-    return new AuthWitness(message, signature);
+    const signature = ecdsa.constructSignature(message.toBuffer(), this.signingPrivateKey);
+    return new AuthWitness(message, [...signature.r, ...signature.s]);
   }
 }

yarn-project/aztec.js/src/account/contract/schnorr_account_contract.ts

@@ -32,7 +32,7 @@ class SchnorrAuthWitnessProvider implements AuthWitnessProvider {
 
   async createAuthWitness(message: Fr): Promise<AuthWitness> {
     const schnorr = await Schnorr.new();
-    const signature = schnorr.constructSignature(message.toBuffer(), this.signingPrivateKey).toFields();
-    return new AuthWitness(message, signature);
+    const signature = schnorr.constructSignature(message.toBuffer(), this.signingPrivateKey).toBuffer();
+    return new AuthWitness(message, [...signature]);
   }
 }

yarn-project/aztec.js/src/account/contract/single_key_account_contract.ts

@@ -38,7 +38,7 @@ class SingleKeyAuthWitnessProvider implements AuthWitnessProvider {
     const schnorr = await Schnorr.new();
     const signature = schnorr.constructSignature(message.toBuffer(), this.privateKey);
     const publicKey = await generatePublicKey(this.privateKey);
-    const witness = [...publicKey.toFields(), ...signature.toFields(), this.partialAddress];
+    const witness = [...publicKey.toFields(), ...signature.toBuffer(), this.partialAddress];
     return new AuthWitness(message, witness);
   }
 }

yarn-project/circuits.js/src/barretenberg/crypto/schnorr/signature.ts

@@ -97,8 +97,8 @@ export class SchnorrSignature implements Signature {
   }
 
   /**
-   * Converts the signature to an array of fields.
-   * @returns The signature components as an array of fields
+   * Converts the signature to an array of three fields.
+   * @returns The signature components as an array of three fields
    */
   toFields(): Fr[] {
     const sig = this.toBuffer();

yarn-project/noir-contracts/src/contracts/schnorr_single_key_account_contract/src/auth_oracle.nr

@@ -22,5 +22,6 @@ impl AuthWitness {
 }
 
 unconstrained fn get_auth_witness(message_hash: Field) -> AuthWitness {
-    AuthWitness::deserialize(auth_witness::get_auth_witness(message_hash))
+    let witness: [Field; 67] = auth_witness::get_auth_witness(message_hash);
+    AuthWitness::deserialize(witness)
 }

yarn-project/types/src/auth_witness.ts

@@ -5,12 +5,17 @@ import { BufferReader, serializeToBuffer } from '@aztec/circuits.js/utils';
  * An authentication witness. Used to authorise an action by a user.
  */
 export class AuthWitness {
+  /** Authentication witness for the hash  */
+  public readonly witness: Fr[];
+
   constructor(
     /** Hash of the request to authorize */
     public readonly requestHash: Fr,
     /** Authentication witness for the hash  */
-    public readonly witness: Fr[],
-  ) {}
+    witness: (Fr | number)[],
+  ) {
+    this.witness = witness.map(x => new Fr(x));
+  }
 
   toBuffer() {
     return serializeToBuffer(this.requestHash, new Vector(this.witness));