Need to be able to deal with a parity bit in the 8th byte for legacy protocols ported to HTTP

[rcbarnett-zz]

MODSEC-13: Needed:

• t:parity7bitEven - Calcs even parity and changes 8th bit of each byte
• t:parity7bitOdd - Calcs odd parity and changes 8th bit of each byte
• t:parity7bitZero - Zeros the 8th bit, removing the parity.

This allows someone to validate parity as well as remove it:

Example of checking even parity:

{noformat}
SecRule TARGET ".*" "capture,pass,nolog,t:none,t:parity7bitEven"
SecRule TARGET "!@Streq %{TX.0}" "deny,msg:'Failed parity check',t:none"
{noformat}

[rcbarnett-zz]

Original reporter: brectanus

[rcbarnett-zz]

brectanus: Changeset: 1147