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-rw-r--r--guix/hash.scm184
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diff --git a/guix/hash.scm b/guix/hash.scm
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-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2018 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 (guix hash)
- #:use-module (guix gcrypt)
- #:use-module (rnrs bytevectors)
- #:use-module (ice-9 binary-ports)
- #:use-module (system foreign)
- #:use-module ((guix build utils) #:select (dump-port))
- #:use-module (srfi srfi-11)
- #:use-module (srfi srfi-26)
- #:export (sha1
- sha256
- open-sha256-port
- port-sha256
- file-sha256
- open-sha256-input-port))
-
-;;; Commentary:
-;;;
-;;; Cryptographic hashes.
-;;;
-;;; Code:
-
-
-;;;
-;;; Hash.
-;;;
-
-(define-syntax GCRY_MD_SHA256
- ;; Value as of Libgcrypt 1.5.2.
- (identifier-syntax 8))
-
-(define-syntax GCRY_MD_SHA1
- (identifier-syntax 2))
-
-(define bytevector-hash
- (let ((hash (pointer->procedure void
- (libgcrypt-func "gcry_md_hash_buffer")
- `(,int * * ,size_t))))
- (lambda (bv type size)
- "Return the hash TYPE, of SIZE bytes, of BV as a bytevector."
- (let ((digest (make-bytevector size)))
- (hash type (bytevector->pointer digest)
- (bytevector->pointer bv) (bytevector-length bv))
- digest))))
-
-(define sha1
- (cut bytevector-hash <> GCRY_MD_SHA1 20))
-
-(define sha256
- (cut bytevector-hash <> GCRY_MD_SHA256 (/ 256 8)))
-
-(define open-sha256-md
- (let ((open (pointer->procedure int
- (libgcrypt-func "gcry_md_open")
- `(* ,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
- (libgcrypt-func "gcry_md_write")
- `(* * ,size_t)))
-
-(define md-read
- (pointer->procedure '*
- (libgcrypt-func "gcry_md_read")
- `(* ,int)))
-
-(define md-close
- (pointer->procedure void
- (libgcrypt-func "gcry_md_close")
- '(*)))
-
-
-(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 position 0)
-
- (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)
- (set! position (+ position len))
- len)))
-
- (define (get-position)
- position)
-
- (define (close)
- (unless digest
- (finalize!)))
-
- (values (make-custom-binary-output-port "sha256"
- write! get-position #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)))
-
-(define (file-sha256 file)
- "Return the SHA256 hash (a bytevector) of FILE."
- (call-with-input-file file port-sha256))
-
-(define (open-sha256-input-port port)
- "Return an input port that wraps PORT and a thunk to get the hash of all the
-data read from PORT. The thunk always returns the same value."
- (define md
- (open-sha256-md))
-
- (define (read! bv start count)
- (let ((n (get-bytevector-n! port bv start count)))
- (if (eof-object? n)
- 0
- (begin
- (unless digest
- (let ((ptr (bytevector->pointer bv start)))
- (md-write md ptr n)))
- n))))
-
- (define digest #f)
-
- (define (finalize!)
- (let ((ptr (md-read md 0)))
- (set! digest (bytevector-copy (pointer->bytevector ptr 32)))
- (md-close md)))
-
- (define (get-hash)
- (unless digest
- (finalize!))
- digest)
-
- (define (unbuffered port)
- ;; Guile <= 2.0.9 does not support 'setvbuf' on custom binary input ports.
- (setvbuf port _IONBF)
- port)
-
- (values (unbuffered (make-custom-binary-input-port "sha256" read! #f #f #f))
- get-hash))
-
-;;; hash.scm ends here