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detect/transform: from_base64 transform #10512

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This PR provides the from_base64 transform used to match on content decoded with base64 using the mode (default rfc4648).

Link to redmine ticket: 6487

Describe changes:

  • New transform: from_base64
  • Documentation
  • Keyword parser in rust.

Provide values to any of the below to override the defaults.

To use a pull request use a branch name like pr/N where N is the
pull request number.

Alternatively, SV_BRANCH may also be a link to an
OISF/suricata-verify pull-request.

SV_REPO=
SV_BRANCH=pr/1670
SU_REPO=
SU_BRANCH=
LIBHTP_REPO=
LIBHTP_BRANCH=

Refactor utility functions/definitions from the byte_math module into
the parser module. This includes parse_var and ResultValue

Issue: 6487
Issue: 6487

Implement from_base64 option parsing in Rust. The Rust module also
contains unit tests.
Issue: 6487

Implement the from_base64 transform:
    [bytes value] [offset value] [mode relax|strict|rfc4648|rfc2045]

    The value for bytes and offset may be a byte_ variable or an
    unsigned integer.
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see inline

@jlucovsky
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Continued in #10524

@jlucovsky jlucovsky closed this Feb 28, 2024
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