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hash: Add `open-sha256-port'.

* guix/hash.scm (GCRY_MD_SHA256): New macro.
  (sha256): Use it.
  (open-sha256-md, md-write, md-read, md-close, open-sha256-port,
  port-sha256): New procedures.
* tests/hash.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
version-0.8.3
Ludovic Courtès 9 years ago
parent
commit
69927e78de
  1. 1
      Makefile.am
  2. 96
      guix/hash.scm
  3. 74
      tests/hash.scm

1
Makefile.am

@ -84,6 +84,7 @@ nobase_nodist_guilemodule_DATA = $(GOBJECTS) guix/config.scm
SCM_TESTS = \
tests/base32.scm \
tests/hash.scm \
tests/builders.scm \
tests/derivations.scm \
tests/ui.scm \

96
guix/hash.scm

@ -19,8 +19,13 @@
(define-module (guix hash)
#:use-module (guix config)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports)
#:use-module (system foreign)
#:export (sha256))
#:use-module ((guix build utils) #:select (dump-port))
#:use-module (srfi srfi-11)
#:export (sha256
open-sha256-port
port-sha256))
;;; Commentary:
;;;
@ -33,17 +38,94 @@
;;; Hash.
;;;
(define-syntax GCRY_MD_SHA256
;; Value as of Libgcrypt 1.5.2.
(identifier-syntax 8))
(define sha256
(let ((hash (pointer->procedure void
(dynamic-func "gcry_md_hash_buffer"
(dynamic-link %libgcrypt))
`(,int * * ,size_t)))
(sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0
(let ((hash (pointer->procedure void
(dynamic-func "gcry_md_hash_buffer"
(dynamic-link %libgcrypt))
`(,int * * ,size_t))))
(lambda (bv)
"Return the SHA256 of BV as a bytevector."
(let ((digest (make-bytevector (/ 256 8))))
(hash sha256 (bytevector->pointer digest)
(hash GCRY_MD_SHA256 (bytevector->pointer digest)
(bytevector->pointer bv) (bytevector-length bv))
digest))))
(define open-sha256-md
(let ((open (pointer->procedure int
(dynamic-func "gcry_md_open"
(dynamic-link %libgcrypt))
`(* ,int ,unsigned-int))))
(lambda ()
(let* ((md (bytevector->pointer (make-bytevector (sizeof '*))))
(err (open md GCRY_MD_SHA256 0)))
(if (zero? err)
(dereference-pointer md)
(throw 'gcrypt-error err))))))
(define md-write
(pointer->procedure void
(dynamic-func "gcry_md_write"
(dynamic-link %libgcrypt))
`(* * ,size_t)))
(define md-read
(pointer->procedure '*
(dynamic-func "gcry_md_read"
(dynamic-link %libgcrypt))
`(* ,int)))
(define md-close
(pointer->procedure void
(dynamic-func "gcry_md_close"
(dynamic-link %libgcrypt))
'(*)))
(define (open-sha256-port)
"Return two values: an output port, and a thunk. When the thunk is called,
it returns the SHA256 hash (a bytevector) of all the data written to the
output port."
(define sha256-md
(open-sha256-md))
(define digest #f)
(define (finalize!)
(let ((ptr (md-read sha256-md 0)))
(set! digest (bytevector-copy (pointer->bytevector ptr 32)))
(md-close sha256-md)))
(define (write! bv offset len)
(if (zero? len)
(begin
(finalize!)
0)
(let ((ptr (bytevector->pointer bv offset)))
(md-write sha256-md ptr len)
len)))
(define (close)
(unless digest
(finalize!)))
(values (make-custom-binary-output-port "sha256"
write! #f #f
close)
(lambda ()
(unless digest
(finalize!))
digest)))
(define (port-sha256 port)
"Return the SHA256 hash (a bytevector) of all the data drained from PORT."
(let-values (((out get)
(open-sha256-port)))
(dump-port port out)
(close-port out)
(get)))
;;; hash.scm ends here

74
tests/hash.scm

@ -0,0 +1,74 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-hash)
#:use-module (guix hash)
#:use-module (guix utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-64)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports))
;; Test the (guix hash) module.
(define %empty-sha256
;; SHA256 hash of the empty string.
(base16-string->bytevector
"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"))
(define %hello-sha256
;; SHA256 hash of "hello world"
(base16-string->bytevector
"b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"))
(test-begin "hash")
(test-equal "sha256, empty"
%empty-sha256
(sha256 #vu8()))
(test-equal "sha256, hello"
%hello-sha256
(sha256 (string->utf8 "hello world")))
(test-equal "open-sha256-port, empty"
%empty-sha256
(let-values (((port get)
(open-sha256-port)))
(close-port port)
(get)))
(test-equal "open-sha256-port, hello"
%hello-sha256
(let-values (((port get)
(open-sha256-port)))
(put-bytevector port (string->utf8 "hello world"))
(get)))
(test-assert "port-sha256"
(let* ((file (search-path %load-path "ice-9/psyntax.scm"))
(size (stat:size (stat file)))
(contents (call-with-input-file file get-bytevector-all)))
(equal? (sha256 contents)
(call-with-input-file file port-sha256))))
(test-end)
(exit (= (test-runner-fail-count (test-runner-current)) 0))
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