Encrypt Multiple Values

🟢 Beginner | 🔐 Encryption

How to encrypt and send multiple values in a single transaction

Overview

This example teaches efficient batch encryption in FHEVM. Instead of encrypting values separately, chain multiple .add*() calls to create a single encrypted input with shared proof. This reduces gas costs, ensures atomicity, and improves efficiency. Learn how to encrypt mixed types (integers + booleans) together and access them via handles array.

Quick Start

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

# Navigate and install
cd my-project
npm install

# Run tests
npx hardhat test

Code Explanation

Two Values

Store two encrypted values from a single encrypted input. Client uses .add64(a).add64(b).encrypt() and contract receives both via handles[0] and handles[1].

Lines 55-75

Three Values

Store three encrypted values. Demonstrates scaling to more values with the same pattern. Order matters: first added = handles[0], second = handles[1], etc.

Lines 79-98

Mixed Types

Store mixed encrypted types (euint64 + ebool) in single input. Shows that different types can share the same encrypted input and proof.

Lines 102-136

Coordinates

Store encrypted 3D coordinates. Practical example for games, location privacy, spatial data. Shows how to group related values.

Lines 140-160

Operations On Multiple

Perform operations on multiple stored encrypted values. Examples: summing values, calculating distance squared, validating account with multiple conditions.

Lines 164-195

FHE Operations Used

• FHE.fromExternal()

• FHE.add()

• FHE.mul()

• FHE.le()

• FHE.and()

• FHE.allowThis()

• FHE.allow()

FHE Types Used

• euint64

• ebool

• externalEuint64

• externalEbool

Tags

encryption batch multiple fromExternal handles efficiency coklu-sifreleme

Related Examples

• encryption-single

• decryption-user-multiple

Prerequisites

Before this example, you should understand:

• encryption-single

Next Steps

After this example, check out:

• decryption-user-single

• decryption-public-single

---

Generated with Lab-Z