Re: [gentoo-portage-dev] [GLEP59v2 2/5] Manifest2 hash: Whirlpool

[Brian Harring <ferringb@gmail.com>]

On Sat, Oct 01, 2011 at 07:40:52AM +0000, Robin H. Johnson wrote:
> From: "Robin H. Johnson" <robbat2@gentoo.org>
> 
> Provide public-domain implementation of the Whirlpool hash algorithm to
> be used as new Manifest2 hash.
> 
> Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
> ---
>  pym/portage/checksum.py |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/pym/portage/checksum.py b/pym/portage/checksum.py
> index e5455fa..3593686 100644
> --- a/pym/portage/checksum.py
> +++ b/pym/portage/checksum.py
> @@ -71,6 +71,10 @@ except ImportError:
>  
>  sha1hash = _generate_hash_function("SHA1", _new_sha1, origin="internal")
>  
> +# Bundled WHIRLPOOL implementation
> +from portage.util.whirlpool import new as _new_whirlpool
> +whirlpoolhash = _generate_hash_function("WHIRLPOOL", _new_whirlpool, origin="bundled")
> +

Likely should shift this to a trailing check if no whirlpool 
implementation was found; via this, we can avoid the import unless 
it's needed.
~brian

>  # Use pycrypto when available, prefer it over the internal fallbacks
>  try:
>  	from Crypto.Hash import SHA256, RIPEMD
> @@ -80,14 +84,14 @@ except ImportError as e:
>  	pass
>  
>  # Use hashlib from python-2.5 if available and prefer it over pycrypto and internal fallbacks.
> -# Need special handling for RMD160 as it may not always be provided by hashlib.
> +# Need special handling for RMD160/WHIRLPOOL as they may not always be provided by hashlib.
>  try:
>  	import hashlib, functools
>  	
>  	md5hash = _generate_hash_function("MD5", hashlib.md5, origin="hashlib")
>  	sha1hash = _generate_hash_function("SHA1", hashlib.sha1, origin="hashlib")
>  	sha256hash = _generate_hash_function("SHA256", hashlib.sha256, origin="hashlib")
> -	for local_name, hash_name in (("rmd160", "ripemd160"), ):
> +	for local_name, hash_name in (("rmd160", "ripemd160"), ("whirlpool", "whirlpool")):
>  		try:
>  			hashlib.new(hash_name)
>  		except ValueError:
> -- 
> 1.7.7
>