---
title: cssm_keyheader
framework: Security
role: symbol
role_heading: Structure
platforms: [macOS 10.0+]
path: security/cssm_keyheader-c.struct
---

# cssm_keyheader

## Declaration

```occ
struct cssm_keyheader;
```

## Topics

### Instance Properties

- [AlgorithmId](security/cssm_keyheader-c.struct/algorithmid.md)
- [BlobType](security/cssm_keyheader-c.struct/blobtype.md)
- [CspId](security/cssm_keyheader-c.struct/cspid.md)
- [EndDate](security/cssm_keyheader-c.struct/enddate.md)
- [Format](security/cssm_keyheader-c.struct/format.md)
- [HeaderVersion](security/cssm_keyheader-c.struct/headerversion.md)
- [KeyAttr](security/cssm_keyheader-c.struct/keyattr.md)
- [KeyClass](security/cssm_keyheader-c.struct/keyclass.md)
- [KeyUsage](security/cssm_keyheader-c.struct/keyusage.md)
- [LogicalKeySizeInBits](security/cssm_keyheader-c.struct/logicalkeysizeinbits.md)
- [Reserved](security/cssm_keyheader-c.struct/reserved.md)
- [StartDate](security/cssm_keyheader-c.struct/startdate.md)
- [WrapAlgorithmId](security/cssm_keyheader-c.struct/wrapalgorithmid.md)
- [WrapMode](security/cssm_keyheader-c.struct/wrapmode.md)