useFhevmEncrypt

Create encrypted inputs for FHEVM smart contracts. Returns a factory function that produces EncryptedInput instances bound to a specific contract address. Each input is bound to prevent encrypted values from being used with unintended contracts.

Options: { contractAddress: string } Returns: { createInput: (userAddress: string) => EncryptedInput, isReady: ComputedRef<boolean> }

Note: If you need to encrypt for multiple contracts, create separate composable instances.

Usage

<script setup lang="ts">
import { ref } from 'vue';
import { useFhevmEncrypt } from '@fhevm/vue-sdk';

const userAddress = ref('0x...');
const { createInput, isReady } = useFhevmEncrypt({
  contractAddress: '0x5FbDB2315678afecb367f032d93F642f64180aa3',
});

async function handleEncrypt() {
  if (!isReady.value || !userAddress.value) return;

  // Create encrypted input bound to contract and user
  const input = createInput(userAddress.value);
  
  // Add values to encrypt
  input.add32(42);
  input.add64(100n);
  input.addBool(true);
  
  // Encrypt all values in a single operation
  const { handles, inputProof } = await input.encrypt();
  
  // Use in contract call
  await contract.myMethod(handles[0], handles[1], handles[2], inputProof);
}
</script>

<template>
  <button @click="handleEncrypt" :disabled="!isReady">
    Encrypt & Submit
  </button>
</template>

Supported Types

The EncryptedInput instance supports all FHEVM encrypted types: add8, add16, add32, add64, add128, add256, addBool, addAddress. See official Zama documentation for complete type reference.

Batch Encryption

All values added to a single input are encrypted together in one operation. The encrypt() method returns an array of handles (one per added value) and a single proof that covers all values:

<script setup lang="ts">
const input = createInput(address.value);
input.add32(10);    // handles[0]
input.add32(20);    // handles[1]
input.add64(30n);   // handles[2]

const { handles, inputProof } = await input.encrypt();

// Single proof validates all three encrypted values
await contract.batchOperation(handles[0], handles[1], handles[2], inputProof);
</script>