2.1 Header

All interfaces (data types and functions) of the library are defined in the header file gcrypt.h. You must include this in all source files using the library, either directly or through some other header file, like this:

     #include <gcrypt.h>

The name space of Libgcrypt is gcry_* for function and type names and GCRY* for other symbols. In addition the same name prefixes with one prepended underscore are reserved for internal use and should never be used by an application. Note that Libgcrypt uses libgpg-error, which uses gpg_* as name space for function and type names and GPG_* for other symbols, including all the error codes.

Certain parts of gcrypt.h may be excluded by defining these macros:

GCRYPT_NO_MPI_MACROS

Do not define the shorthand macros mpi_* for gcry_mpi_*.

GCRYPT_NO_DEPRECATED

Do not include definitions for deprecated features. This is useful to make sure that no deprecated features are used.