diff options
| -rw-r--r-- | Makefile.am | 1 | ||||
| -rw-r--r-- | guix/hash.scm | 96 | ||||
| -rw-r--r-- | tests/hash.scm | 74 |
3 files changed, 164 insertions, 7 deletions
diff --git a/Makefile.am b/Makefile.am index 2893ffb72b..9d872313e7 100644 --- a/Makefile.am +++ b/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 \ diff --git a/guix/hash.scm b/guix/hash.scm index 1c7e342803..92ecaf78d5 100644 --- a/guix/hash.scm +++ b/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 diff --git a/tests/hash.scm b/tests/hash.scm new file mode 100644 index 0000000000..27751023d3 --- /dev/null +++ b/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)) |