From: Michal Rokos <m.rokos@...>
Date: 2002-02-10T00:00:41+09:00
Subject: Re: Can't use md5.rb with openssl on RedHat 7.2

Hello,

	Hash implementation functions in ext/digest/md5 are named:
--------------------------------
void MD5_Init _((MD5_CTX *pms));
void MD5_Update _((MD5_CTX *pms, const uint8_t *data, size_t nbytes));
void MD5_Final _((uint8_t *digest, MD5_CTX *pms));
void MD5_End _((MD5_CTX *pctx, uint8_t *hexdigest));
--------------------------------

	In openssl there are the same function:
--------------------------------
void MD5_Init(MD5_CTX *c);
void MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
void MD5_Final(unsigned char *md, MD5_CTX *c);
--------------------------------

	(The interfaces' names are given by some standard.)

	If you rename Ruby's ext interfaces (like MD5_Init ->
	MD5_Init_R) all starts work again!

	It's very strange, but seems to me like Ruby's ext lib functions
	are calling in fact openssl's functions (if they have the same
	names).


		Michal
		
PS: To Ruby-talk guys: Can anybody say more about?

PPS: The ruby-1.6.6 has the same behaviour.

On Thu, Dec 13, 2001 at 01:30:29PM +0900, TAKEMURA Masahiro wrote:
> I happen to meet strange phenomenon. Please show following examples
> 
> example1:
> require 'openssl'
> require 'md5'
> 
> print "#{MD5.new("abc")}\n"
> -----
> result1:
> 7c894eea7d5209446e74288bd514863f
> -----
> example2:
> require 'openssl'
> require 'md5'
> 
> 
> print "#{MD5.new("abc")}\n"
> -----
> result2:
> test.rb:5: [BUG] Segmentation fault
> ruby 1.6.5 (2001-11-23) [i686-linux]
> Aborted
> -----
> example3:
> require 'md5'
> require 'openssl'
> 
> print "#{MD5.new("abc")}\n"
> -----
> result3:
> 900150983cd24fb0d6963f7d28e17f72
> -----
> Difference between example1 and example2 is only number of empty lines.
> In example3, change the order of reading libraries.
> 
> Only example3 returns right answer. 
> Why this problem was occured.
> 
> This problem is occured only on Redhat 7.
> Not occured on FreeBSD
> 
> 
> ENVIRONMENT:
> 
> OS: RedHat Linux 7.2 (this phenomenon is occured when using 7.1)
> OpenSSL 0.9.6b
> ruby-1.6.5-2001.11.23
> ossl-0.0.9 compiled with gcc version 2.95.3 20010315 (release)
> (I can't make with pre-installed 2.96)
> 
> --
> Masahiro TAKEMURA : mastk@nifty.com

-- 
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Michal Rokos                           Czech Technical University, Prague
E-mail: m.rokos@sh.cvut.cz         Jabber: majkl@jabber.cz, ICQ: 36118339
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