Crypto block padding

[cam...@camlittle.com]

Are there any plans or existing work on implementing block padding for the golang crypto package? It seems like it'd be a useful feature to have. 

[agl]

On Saturday, March 15, 2014 8:17:40 PM UTC-4, cam...@camlittle.com wrote:

Are there any plans or existing work on implementing block padding for the golang crypto package? It seems like it'd be a useful feature to have. 

You mean PKCS#5 padding for CBC mode?

I'd have no objection to a patch if well done, but I would hope that people are moving away from such schemes.

Cheers

AGL 

[cam...@camlittle.com]

Preferably that along with PKCS7, ANSI X.923, and whatever other common ones are out there.

What do you mean by "moving away from such schemes"? What sort of alternatives are out there for block padding? I don't know enough about cryptography to know what else is more effective.

I've got a project I'm working on that may require this, so if I come up with anything good, I'll be sure to share.

Cameron

[agl]

On Sunday, March 16, 2014 12:26:11 PM UTC-4, Cameron Little wrote:

What do you mean by "moving away from such schemes"? What sort of alternatives are out there for block padding? I don't know enough about cryptography to know what else is more effective.

 When dealing with old code it can be needed, but anything new should use GCM or go.crypto/nacl/secretbox.

Cheers

AGL

[Cameron Little]

Makes sense. At this point, I need it for a project, so I've gotten a start on a package. It's at https://github.com/apexskier/cryptoPadding if anyone'd like to take a look.

Cameron

[Cameron Little]

I've modeled my algorithms as best I could off of the descriptions I found online.

For usage, you define a variable of the padding type, but don't initialize it. Then you can call functions it implements. I'm not sure how standard this is compared go's other stuff, but it seems clean to me.

Example:

var (

    p cryptoPadding.PKCS7

    blocksize 16

)

padded, err := p.Pad(data, blocksize)

data2, err := p.Unpad(padded, blocksize)