diff --git a/noir-projects/noir-contracts/Nargo.toml b/noir-projects/noir-contracts/Nargo.toml
index 18ba10820a7..263c45bba62 100644
--- a/noir-projects/noir-contracts/Nargo.toml
+++ b/noir-projects/noir-contracts/Nargo.toml
@@ -5,6 +5,7 @@ members = [
     "contracts/auth_contract",
     "contracts/auth_registry_contract",
     "contracts/auth_wit_test_contract",
+    "contracts/avm_gadgets_test_contract",
     "contracts/avm_initializer_test_contract",
     "contracts/avm_test_contract",
     "contracts/fpc_contract",
diff --git a/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/Nargo.toml b/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/Nargo.toml
new file mode 100644
index 00000000000..ca88c967955
--- /dev/null
+++ b/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/Nargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "avm_gadgets_test_contract"
+authors = [""]
+compiler_version = ">=0.25.0"
+type = "contract"
+
+[dependencies]
+aztec = { path = "../../../aztec-nr/aztec" }
diff --git a/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/src/main.nr b/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/src/main.nr
new file mode 100644
index 00000000000..0a353249339
--- /dev/null
+++ b/noir-projects/noir-contracts/contracts/avm_gadgets_test_contract/src/main.nr
@@ -0,0 +1,93 @@
+use dep::aztec::macros::aztec;
+
+#[aztec]
+contract AvmGadgetsTest {
+    use dep::aztec::macros::functions::public;
+
+    #[public]
+    fn keccak_hash(data: [u8; 10]) -> [u8; 32] {
+        std::hash::keccak256(data, data.len() as u32)
+    }
+
+    #[public]
+    fn keccak_f1600(data: [u64; 25]) -> [u64; 25] {
+        std::hash::keccak::keccakf1600(data)
+    }
+
+    #[public]
+    fn poseidon2_hash(data: [Field; 10]) -> Field {
+        std::hash::poseidon2::Poseidon2::hash(data, data.len())
+    }
+
+    #[public]
+    fn sha256_hash_10(data: [u8; 10]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_20(data: [u8; 20]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_30(data: [u8; 30]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_40(data: [u8; 40]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_50(data: [u8; 50]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_60(data: [u8; 60]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_70(data: [u8; 70]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_80(data: [u8; 80]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_90(data: [u8; 90]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_100(data: [u8; 100]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_255(data: [u8; 255]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_256(data: [u8; 256]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_511(data: [u8; 511]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+    #[public]
+    fn sha256_hash_512(data: [u8; 512]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+
+    #[public]
+    fn sha256_hash_2048(data: [u8; 2048]) -> [u8; 32] {
+        std::hash::sha256(data)
+    }
+
+    #[public]
+    fn pedersen_hash(data: [Field; 10]) -> Field {
+        std::hash::pedersen_hash(data)
+    }
+
+    #[public]
+    fn pedersen_hash_with_index(data: [Field; 10]) -> Field {
+        std::hash::pedersen_hash_with_separator(data, /*index=*/ 20)
+    }
+}
diff --git a/noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr b/noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr
index e3d45c694ea..5fd24054467 100644
--- a/noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr
+++ b/noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr
@@ -297,6 +297,8 @@ pub contract AvmTest {
     }
 
     /************************************************************************
+<<<<<<< HEAD
+=======
      * Hashing functions
      ************************************************************************/
     #[public]
@@ -330,6 +332,7 @@ pub contract AvmTest {
     }
 
     /************************************************************************
+>>>>>>> master
      * Contract instance
      ************************************************************************/
     #[public]
@@ -660,15 +663,15 @@ pub contract AvmTest {
         dep::aztec::oracle::debug_log::debug_log("read_storage_map");
         let _ = read_storage_map(context.this_address());
         dep::aztec::oracle::debug_log::debug_log("keccak_hash");
-        let _ = keccak_hash(args_u8);
+        let _ = std::hash::keccak256(args_u8, args_u8.len() as u32);
         dep::aztec::oracle::debug_log::debug_log("sha256_hash");
-        let _ = sha256_hash(args_u8);
+        let _ = std::hash::sha256(args_u8);
         dep::aztec::oracle::debug_log::debug_log("poseidon2_hash");
-        let _ = poseidon2_hash(args_field);
+        let _ = std::hash::poseidon2::Poseidon2::hash(args_field, args_field.len());
         dep::aztec::oracle::debug_log::debug_log("pedersen_hash");
-        let _ = pedersen_hash(args_field);
+        let _ = std::hash::pedersen_hash(args_field);
         dep::aztec::oracle::debug_log::debug_log("pedersen_hash_with_index");
-        let _ = pedersen_hash_with_index(args_field);
+        let _ = std::hash::pedersen_hash_with_separator(args_field, /*index=*/ 20);
         dep::aztec::oracle::debug_log::debug_log("test_get_contract_instance");
         test_get_contract_instance_matches(
             get_instance_for_address,
diff --git a/yarn-project/simulator/src/avm/avm_simulator.test.ts b/yarn-project/simulator/src/avm/avm_simulator.test.ts
index ab3b1946c34..255420c45a2 100644
--- a/yarn-project/simulator/src/avm/avm_simulator.test.ts
+++ b/yarn-project/simulator/src/avm/avm_simulator.test.ts
@@ -36,6 +36,7 @@ import { AvmSimulator } from './avm_simulator.js';
 import { AvmEphemeralForest } from './avm_tree.js';
 import { isAvmBytecode, markBytecodeAsAvm } from './bytecode_utils.js';
 import {
+  getAvmGadgetsTestContractBytecode,
   getAvmTestContractArtifact,
   getAvmTestContractBytecode,
   initContext,
@@ -384,19 +385,43 @@ describe('AVM simulator: transpiled Noir contracts', () => {
     });
   });
 
+  /*
+   * Can run these as follows to measure sha256 instruction execution counts:
+   * for i in 10 20 30 40 50 60 70 80 90 100 255 256 511 512 2048; do
+   *   echo sha-ing $i...;
+   *   LOG_LEVEL=debug yarn test src/avm/avm_simulator.test.ts -t "sha256_hash_$i " &> sha$i.log;
+   * done
+   * for i in 10 20 30 40 50 60 70 80 90 100 255 256 511 512 2048; do
+   *   echo sha256 of $i bytes $(grep -Eo 'Executed .* instructions.* Gas' sha$i.log);
+   * done
+   */
   describe.each([
-    ['sha256_hash', /*input=*/ randomMemoryBytes(10), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_10', /*input=*/ randomMemoryBytes(10), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_20', /*input=*/ randomMemoryBytes(20), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_30', /*input=*/ randomMemoryBytes(30), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_40', /*input=*/ randomMemoryBytes(40), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_50', /*input=*/ randomMemoryBytes(50), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_60', /*input=*/ randomMemoryBytes(60), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_70', /*input=*/ randomMemoryBytes(70), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_80', /*input=*/ randomMemoryBytes(80), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_90', /*input=*/ randomMemoryBytes(90), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_100', /*input=*/ randomMemoryBytes(100), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_255', /*input=*/ randomMemoryBytes(255), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_256', /*input=*/ randomMemoryBytes(256), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_511', /*input=*/ randomMemoryBytes(511), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_512', /*input=*/ randomMemoryBytes(512), /*output=*/ sha256FromMemoryBytes],
+    ['sha256_hash_2048', /*input=*/ randomMemoryBytes(2048), /*output=*/ sha256FromMemoryBytes],
     ['keccak_hash', /*input=*/ randomMemoryBytes(10), /*output=*/ keccak256FromMemoryBytes],
     ['keccak_f1600', /*input=*/ randomMemoryUint64s(25), /*output=*/ keccakF1600FromMemoryUint64s],
     ['poseidon2_hash', /*input=*/ randomMemoryFields(10), /*output=*/ poseidon2FromMemoryFields],
     ['pedersen_hash', /*input=*/ randomMemoryFields(10), /*output=*/ pedersenFromMemoryFields],
     ['pedersen_hash_with_index', /*input=*/ randomMemoryFields(10), /*output=*/ indexedPedersenFromMemoryFields],
   ])('Hashes in noir contracts', (name: string, input: MemoryValue[], output: (msg: any[]) => Promise<Fr[]>) => {
-    it(`Should execute contract function that performs ${name}`, async () => {
+    it(`Should execute contract function that performs ${name} on input of length ${input.length}`, async () => {
       const calldata = input.map(e => e.toFr());
 
       const context = initContext({ env: initExecutionEnvironment({ calldata }) });
-      const bytecode = getAvmTestContractBytecode(name);
+      const bytecode = getAvmGadgetsTestContractBytecode(name);
       const results = await new AvmSimulator(context).executeBytecode(bytecode);
 
       expect(results.reverted).toBe(false);
diff --git a/yarn-project/simulator/src/avm/fixtures/index.ts b/yarn-project/simulator/src/avm/fixtures/index.ts
index 938bebf2a2c..8ef8937470e 100644
--- a/yarn-project/simulator/src/avm/fixtures/index.ts
+++ b/yarn-project/simulator/src/avm/fixtures/index.ts
@@ -4,6 +4,7 @@ import { type ContractArtifact, type FunctionArtifact, FunctionSelector } from '
 import { AztecAddress } from '@aztec/foundation/aztec-address';
 import { EthAddress } from '@aztec/foundation/eth-address';
 import { Fr } from '@aztec/foundation/fields';
+import { AvmGadgetsTestContractArtifact } from '@aztec/noir-contracts.js/AvmGadgetsTest';
 import { AvmTestContractArtifact } from '@aztec/noir-contracts.js/AvmTest';
 
 import { strict as assert } from 'assert';
@@ -169,6 +170,13 @@ export function getAvmTestContractFunctionSelector(functionName: string): Promis
   return getFunctionSelector(functionName, AvmTestContractArtifact);
 }
 
+export function getAvmGadgetsTestContractFunctionSelector(functionName: string): Promise<FunctionSelector> {
+  const artifact = AvmGadgetsTestContractArtifact.functions.find(f => f.name === functionName)!;
+  assert(!!artifact, `Function ${functionName} not found in AvmGadgetsTestContractArtifact`);
+  const params = artifact.parameters;
+  return FunctionSelector.fromNameAndParameters(artifact.name, params);
+}
+
 export function getAvmTestContractArtifact(functionName: string): FunctionArtifact {
   const artifact = getContractFunctionArtifact(functionName, AvmTestContractArtifact);
   assert(
@@ -178,11 +186,25 @@ export function getAvmTestContractArtifact(functionName: string): FunctionArtifa
   return artifact;
 }
 
+export function getAvmGadgetsTestContractArtifact(functionName: string): FunctionArtifact {
+  const artifact = AvmGadgetsTestContractArtifact.functions.find(f => f.name === functionName)!;
+  assert(
+    !!artifact?.bytecode,
+    `No bytecode found for function ${functionName}. Try re-running bootstrap.sh on the repository root.`,
+  );
+  return artifact;
+}
+
 export function getAvmTestContractBytecode(functionName: string): Buffer {
   const artifact = getAvmTestContractArtifact(functionName);
   return artifact.bytecode;
 }
 
+export function getAvmGadgetsTestContractBytecode(functionName: string): Buffer {
+  const artifact = getAvmGadgetsTestContractArtifact(functionName);
+  return artifact.bytecode;
+}
+
 export function resolveAvmTestContractAssertionMessage(
   functionName: string,
   revertReason: AvmRevertReason,
@@ -190,3 +212,20 @@ export function resolveAvmTestContractAssertionMessage(
 ): string | undefined {
   return resolveContractAssertionMessage(functionName, revertReason, output, AvmTestContractArtifact);
 }
+
+export function resolveAvmGadgetsTestContractAssertionMessage(
+  functionName: string,
+  revertReason: AvmRevertReason,
+  output: Fr[],
+): string | undefined {
+  traverseCauseChain(revertReason, cause => {
+    revertReason = cause as AvmRevertReason;
+  });
+
+  const functionArtifact = AvmGadgetsTestContractArtifact.functions.find(f => f.name === functionName);
+  if (!functionArtifact || !revertReason.noirCallStack || !isNoirCallStackUnresolved(revertReason.noirCallStack)) {
+    return undefined;
+  }
+
+  return resolveAssertionMessageFromRevertData(output, functionArtifact);
+}