---
title: "init(SizeInputBlock:SizeOutputBlock:)"
framework: security
role: symbol
role_heading: Initializer
path: "security/cssm_query_size_data-swift.struct/init(sizeinputblock:sizeoutputblock:)"
---

# init(SizeInputBlock:SizeOutputBlock:)

## Declaration

```swift
init(SizeInputBlock: uint32, SizeOutputBlock: uint32)
```