User Decrypt Multiple Values

🟡 Intermediate | 🔓 Decryption

How to privately decrypt multiple encrypted values at once for authorized users

Overview

This example demonstrates batch private decryption in FHEVM. Learn how to store multiple encrypted values (like a user profile with balance, score, level) and let users decrypt all of them efficiently. Shows how to use FHE.allow() for multiple values, retrieve all handles in one call, and decrypt in batch off-chain.

Quick Start

# Create new project from this template
npx labz create decryption-user-multiple my-project

# Navigate and install
cd my-project
npm install

# Run tests
npx hardhat test

Code Explanation

Create Profile

Store 4 encrypted values (balance, score, level, isPremium) with FHE.allow() for each. All values are encrypted and only the owner can decrypt them.

Lines 48-90

Get All Handles

Return all 4 encrypted handles in one call. User can then decrypt all values off-chain in batch. More efficient than calling 4 separate functions.

Lines 106-120

Game Stats

Another example with 4 encrypted game attributes (health, mana, strength, defense). Shows the pattern works for any type of multi-value data.

Lines 124-168

Share Multiple

Share all encrypted values with another user at once. Grants FHE.allow() for all 4 values to the viewer address.

Lines 172-184

Update Multiple

Update multiple encrypted values atomically. IMPORTANT: New values need new FHE.allow() permissions.

Lines 202-222

FHE Operations Used

  • FHE.fromExternal()

  • FHE.add()

  • FHE.asEbool()

  • FHE.allowThis()

  • FHE.allow()

FHE Types Used

  • euint64

  • euint32

  • ebool

  • externalEuint64

  • externalEuint32

Tags

decryption private user multiple batch FHE.allow userDecryptEuint profile game-stats

Related Examples

Prerequisites

Before this example, you should understand:

Next Steps

After this example, check out:

Generated with Lab-Z

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