> ## Documentation Index
> Fetch the complete documentation index at: https://cofhe-docs.fhenix.zone/llms.txt
> Use this file to discover all available pages before exploring further.

# Utility Functions

> isInitialized, unwrap, wrap — handle inspection and conversion utilities

## isInitialized

Checks whether an encrypted value has been initialized (i.e., is not a zero/empty handle). Works on all encrypted types.

```solidity theme={null}
if (FHE.isInitialized(encryptedBalance)) {
    // safe to use
}
```

## unwrap

Extracts the raw `bytes32` handle from a typed encrypted value.

```solidity theme={null}
bytes32 handle = FHE.unwrap(encryptedValue);
```

## wrap

Wraps a raw `bytes32` handle into a typed encrypted value. One function per type:

```solidity theme={null}
ebool val    = FHE.wrapEbool(handle);
euint8 val   = FHE.wrapEuint8(handle);
euint16 val  = FHE.wrapEuint16(handle);
euint32 val  = FHE.wrapEuint32(handle);
euint64 val  = FHE.wrapEuint64(handle);
euint128 val = FHE.wrapEuint128(handle);
eaddress val = FHE.wrapEaddress(handle);
```

<Tip>
  Use `wrap` when you have a raw handle from storage or an event and need to convert it back to a typed encrypted value.
</Tip>

## Random Number Generation

Generate random encrypted values. An optional `securityZone` parameter is supported.

```solidity theme={null}
euint8 rand   = FHE.randomEuint8();
euint16 rand  = FHE.randomEuint16();
euint32 rand  = FHE.randomEuint32();
euint64 rand  = FHE.randomEuint64();
euint128 rand = FHE.randomEuint128();

// With security zone
euint32 rand = FHE.randomEuint32(1);
```