On 11 December 2017 at 13:09, Ben Coman <btc@openinworld.com> wrote:

2017-12-10 6:01 GMT-03:00 Ben Coman <btc@openinworld.com>:
> Can anyone recommend libraries (native Smalltalk or via FFI)
> to do generate a HMAC-SHA512 ?

On 11 December 2017 at 01:30, Hern��n Morales Durand <hernan.morales@gmail.com> wrote:
Hi Ben,

I would use NaCl: http://cr.yp.to/highspeed/coolnacl-20120725.pdf
which you can install from the Pharo Project Catalog in Pharo 6.x

Thanks Henry.�� That looks like path of least resistance.

Whoops, I meant thanks Hern��n.��

��

��I hit a stumbling block that took a short while to understand.
The library binary downloaded specified by ConfigruationOfNacl>>platformLibraryUrl
is�� libsodium: ELF 32-bit LSB shared object
whereas I'm using 64bit Linux.��

btw, I discovered just now that FFILibrary>>unix64ModuleName��

was introduced this year.�� So presumably with the following

you could include both bit'ness libraries in the��libsodium.so.gz��

file specified in ConfigurationOfNacl >> platformLibraryUrl.

FFILbrary subclass: #Nacl

instanceVariableNames: ''

classVariableNames: ''

package: 'Crypto-Nacl'

Nacl >> unixModuleName

�� ^ 'libsodium.so'

Nacl >> unix64ModuleName

�� ^ 'libsodium64.so'

Nacl class >> apiXXX��

^ self��ffiCall: #(void XXX())��

�� module: Nacl

��

I have the following system library preinstalled...��
/usr/lib/x86_64-linux-gnu/libsodium.so.18.0.1: ELF 64-bit LSB shared object

However its api is slightly different.�� Pharo Nacl makes this call out...
�� crypto_hash_sha512_ref()

but the system library provides...
�� 56: 0000000000014dc0�� 175 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512_final
�� 81: 0000000000014c40�� 384 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512_update
�� 154: 0000000000014bd0�� 106 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512_init
�� 233: 0000000000014e70�� 114 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512
�� 342: 0000000000012330�� 6 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512_bytes
�� 351: 0000000000012340�� 6 FUNC�� GLOBAL DEFAULT�� 11 crypto_hash_sha512_statebytes

The canonical source doesn't seem to have the function
https://github.com/jedisct1/libsodium/search?utf8=%E2%9C%93&q=+crypto_hash_sha512_ref
so I'm curious where the "_ref" comes from.��

My options seem...
* Compile a 64-bit libsodium from source which includes "_ref" functions. Where is such source?��

* Use the system libsodium and define an FFI callout just for the one function I need.

btw, I'm doing the latter for now as the immediate path of least resistance.��

Thanks Hernan, for the tip on libsodium.

cheers -ben