/usr/lib/ruby/1.8/x86_64-linux/digest.h is in ruby1.8-dev 1.8.7.352-2ubuntu1.
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: shyouhei $
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 11708 2007-02-12 23:01:19Z shyouhei $
************************************************/
#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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