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 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.  Furthermore `libgpg-error'
 defines functions prefixed with `gpg_' and preprocessor symbols
 prefixed with `GPG_'.  Note that Libgcrypt uses libgpg-error, which
 uses `gpg_err_*' as name space for function and type names and
 `GPG_ERR_*' for other symbols, including all the error codes.
 
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