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MISRA.md

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MISRA Compliance

The PKCS #11 library files conform to the MISRA C:2012 guidelines, with some noted exceptions. Compliance is checked with Coverity static analysis. Deviations from the MISRA standard are listed below:

Ignored by Coverity Configuration

Deviation Category Justification
Directive 4.5 Advisory Allow names that MISRA considers ambiguous (such as LogInfo and LogError)
Directive 4.8 Advisory Allow inclusion of unused types. Header files for a specific port, which are needed by all files, may define types that are not used by a specific file.
Directive 4.9 Advisory Allow inclusion of function like macros. The assert macro is used throughout the library for parameter validation, and logging is done using function like macros.
Rule 2.4 Advisory Allow unused tags. Some compilers warn if types are not tagged.
Rule 2.5 Advisory Allow unused macros. Library headers may define macros intended for the application's use, but are not used by a specific file.
Rule 3.1 Required Allow nested comments. C++ style // comments are used in example code within Doxygen documentation blocks.
Rule 8.13 Advisory A pointer should be a const qualified type whenever possible. The files could be const qualified but the header files pkcs11.h, pkcs11t.h, and pkcs11f.h are derived from the PKCS #11 specification, and cannot be modified.

| Rule 11.5 | Advisory | Allow casts from void *. Fields such as publish payloads are passed as void * and must be cast to the correct data type before use. | | Rule 21.1 | Required | Allow use of all macro names. For compatibility, some macros introduced in C99 are defined for use with C90 compilers. | | Rule 21.2 | Required | Allow use of all macro and identifier names. For compatibility, some macros introduced in C99 are defined for use with C90 compilers. |

Flagged by Coverity

Deviation Category Justification
Rule 8.7 Advisory API functions are not used by the library outside of the files they are defined; however, they must be externally visible in order to be used by an application.

Suppressed with Coverity Comments

Deviation Category Justification
Rule 10.5 Advisory The value of an expression should not be cast to an inappropriate essential type. The boolean type of the PKCS #11 standard is an unsigned char, which is an acceptable base type for a boolean type.