/usr/include/ruby-1.9.1/ruby/digest.h is in ruby1.9.1-dev 1.9.3.484-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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digest.h - header file for ruby digest modules
$Author: akr $
created at: Fri May 25 08:54:56 JST 2001
Copyright (C) 2001-2006 Akinori MUSHA
$RoughId: digest.h,v 1.3 2001/07/13 15:38:27 knu Exp $
$Id: digest.h 25189 2009-10-02 12:04:37Z akr $
************************************************/
#include "ruby.h"
#define RUBY_DIGEST_API_VERSION 2
typedef void (*rb_digest_hash_init_func_t)(void *);
typedef void (*rb_digest_hash_update_func_t)(void *, unsigned char *, size_t);
typedef void (*rb_digest_hash_finish_func_t)(void *, unsigned char *);
typedef struct {
int api_version;
size_t digest_len;
size_t block_len;
size_t ctx_size;
rb_digest_hash_init_func_t init_func;
rb_digest_hash_update_func_t update_func;
rb_digest_hash_finish_func_t finish_func;
} rb_digest_metadata_t;
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