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ch7: Write "transformations" section about CSF

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Heiko Schaefer 2023-11-11 18:45:18 +01:00
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7
book/source/07-signing_data.md
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@ -17,6 +17,7 @@ Data signatures can only be issued by component keys with the *signing* [key fla
Note that signatures over data are distinct from {ref}`component_signatures_chapter`, which are used to attach metadata or subkeys to a certificate.
(data_signature_types)=
## Signature types
OpenPGP data signatures use one of two [signature types](signature_types):
@ -125,11 +126,9 @@ This combination can be attractive for processes where signed messages are handl
#### Text transformations for cleartext signatures
```{admonition} TODO
:class: warning
In the cleartext signature framework, the message text is normalized by [escaping dashes](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-dash-escaped-text), to prevent parsing problems where message content and armor headers are confused.
explain text transformations for cleartext signatures (LF->CRLF and additional escaping)
```
Additionally, as usual for [text signatures](data_signature_types), the signature is calculated on the text with normalized line endings (`<CR><LF>`).
#### Pitfalls