Add (guix pk-crypto).
* guix/pk-crypto.scm, tests/pk-crypto.scm: New files. * Makefile.am (MODULES, SCM_TESTS): Add them.
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Ludovic Courtès
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@ -30,6 +30,7 @@ MODULES = \
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guix/base32.scm \
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guix/records.scm \
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guix/hash.scm \
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guix/pk-crypto.scm \
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guix/utils.scm \
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guix/download.scm \
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guix/monads.scm \
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@ -107,6 +108,7 @@ clean-go:
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SCM_TESTS = \
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tests/base32.scm \
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tests/hash.scm \
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tests/pk-crypto.scm \
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tests/builders.scm \
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tests/derivations.scm \
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tests/ui.scm \
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@ -0,0 +1,167 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix pk-crypto)
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#:use-module (guix config)
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#:use-module ((guix utils) #:select (bytevector->base16-string))
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#:use-module (system foreign)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:export (gcry-sexp?
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string->gcry-sexp
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gcry-sexp->string
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number->gcry-sexp
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bytevector->hash-data
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sign
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verify
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generate-key
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find-sexp-token))
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;;; Commentary:
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;;;
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;;; Public key cryptographic routines from GNU Libgcrypt.
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;;;;
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;;; Libgcrypt uses s-expressions to represent key material, parameters, and
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;;; data. We keep it as an opaque object rather than attempting to map them
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;;; to Scheme s-expressions because (1) Libgcrypt sexps are stored in secure
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;;; memory, and (2) the read syntax is different.
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;;;
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;;; Code:
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;; Libgcrypt "s-expressions".
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(define-wrapped-pointer-type <gcry-sexp>
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gcry-sexp?
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naked-pointer->gcry-sexp
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gcry-sexp->pointer
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(lambda (obj port)
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;; Don't print OBJ's external representation: we don't want key material
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;; to leak in backtraces and such.
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(format port "#<gcry-sexp ~a | ~a>"
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(number->string (object-address obj) 16)
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(number->string (pointer-address (gcry-sexp->pointer obj))
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16))))
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(define libgcrypt-func
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(let ((lib (dynamic-link %libgcrypt)))
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(lambda (func)
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"Return a pointer to symbol FUNC in libgcrypt."
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(dynamic-func func lib))))
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(define finalize-gcry-sexp!
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(libgcrypt-func "gcry_sexp_release"))
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(define-inlinable (pointer->gcry-sexp ptr)
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"Return a <gcry-sexp> that wraps PTR."
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(let* ((sexp (naked-pointer->gcry-sexp ptr))
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(ptr* (gcry-sexp->pointer sexp)))
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;; Did we already have a <gcry-sexp> object for PTR?
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(when (equal? ptr ptr*)
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;; No, so we can safely add a finalizer (in Guile 2.0.9
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;; 'set-pointer-finalizer!' *adds* a finalizer rather than replacing the
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;; existing one.)
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(set-pointer-finalizer! ptr finalize-gcry-sexp!))
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sexp))
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(define string->gcry-sexp
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(let* ((ptr (libgcrypt-func "gcry_sexp_new"))
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(proc (pointer->procedure int ptr `(* * ,size_t ,int))))
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(lambda (str)
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"Parse STR and return the corresponding gcrypt s-expression."
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(let* ((sexp (bytevector->pointer (make-bytevector (sizeof '*))))
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(err (proc sexp (string->pointer str) 0 1)))
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(if (= 0 err)
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(pointer->gcry-sexp (dereference-pointer sexp))
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(throw 'gcry-error err))))))
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(define-syntax GCRYSEXP_FMT_ADVANCED
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(identifier-syntax 3))
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(define gcry-sexp->string
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(let* ((ptr (libgcrypt-func "gcry_sexp_sprint"))
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(proc (pointer->procedure size_t ptr `(* ,int * ,size_t))))
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(lambda (sexp)
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"Return a textual representation of SEXP."
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(let loop ((len 1024))
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(let* ((buf (bytevector->pointer (make-bytevector len)))
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(size (proc (gcry-sexp->pointer sexp)
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GCRYSEXP_FMT_ADVANCED buf len)))
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(if (zero? size)
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(loop (* len 2))
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(pointer->string buf size "ISO-8859-1")))))))
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(define (number->gcry-sexp number)
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"Return an s-expression representing NUMBER."
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(string->gcry-sexp (string-append "#" (number->string number 16) "#")))
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(define* (bytevector->hash-data bv #:optional (hash-algo "sha256"))
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"Given BV, a bytevector containing a hash, return an s-expression suitable
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for use as the data for 'sign'."
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(string->gcry-sexp
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(format #f "(data (flags pkcs1) (hash \"~a\" #~a#))"
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hash-algo
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(bytevector->base16-string bv))))
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(define sign
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(let* ((ptr (libgcrypt-func "gcry_pk_sign"))
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(proc (pointer->procedure int ptr '(* * *))))
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(lambda (data secret-key)
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"Sign DATA (an s-expression) with SECRET-KEY (an s-expression whose car
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is 'private-key'.)"
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(let* ((sig (bytevector->pointer (make-bytevector (sizeof '*))))
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(err (proc sig (gcry-sexp->pointer data)
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(gcry-sexp->pointer secret-key))))
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(if (= 0 err)
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(pointer->gcry-sexp (dereference-pointer sig))
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(throw 'gry-error err))))))
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(define verify
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(let* ((ptr (libgcrypt-func "gcry_pk_verify"))
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(proc (pointer->procedure int ptr '(* * *))))
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(lambda (signature data public-key)
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"Verify that SIGNATURE is a signature of DATA with PUBLIC-KEY, all of
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which are gcrypt s-expressions."
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(zero? (proc (gcry-sexp->pointer signature)
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(gcry-sexp->pointer data)
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(gcry-sexp->pointer public-key))))))
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(define generate-key
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(let* ((ptr (libgcrypt-func "gcry_pk_genkey"))
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(proc (pointer->procedure int ptr '(* *))))
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(lambda (params)
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"Return as an s-expression a new key pair for PARAMS. PARAMS must be an
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s-expression like: (genkey (rsa (nbits 4:2048)))."
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(let* ((key (bytevector->pointer (make-bytevector (sizeof '*))))
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(err (proc key (gcry-sexp->pointer params))))
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(if (zero? err)
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(pointer->gcry-sexp (dereference-pointer key))
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(throw 'gcry-error err))))))
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(define find-sexp-token
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(let* ((ptr (libgcrypt-func "gcry_sexp_find_token"))
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(proc (pointer->procedure '* ptr `(* * ,size_t))))
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(lambda (sexp token)
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"Find in SEXP the first element whose 'car' is TOKEN and return it;
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return #f if not found."
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(let* ((token (string->pointer (symbol->string token)))
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(res (proc (gcry-sexp->pointer sexp) token 0)))
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(if (null-pointer? res)
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#f
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(pointer->gcry-sexp res))))))
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;;; pk-crypto.scm ends here
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@ -0,0 +1,106 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (test-pk-crypto)
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#:use-module (guix pk-crypto)
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#:use-module (guix utils)
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#:use-module (guix hash)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-64)
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#:use-module (rnrs bytevectors)
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#:use-module (rnrs io ports)
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#:use-module (ice-9 match))
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;; Test the (guix pk-crypto) module.
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(define %key-pair
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;; Key pair that was generated with:
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;; (generate-key (string->gcry-sexp "(genkey (rsa (nbits 4:1024)))"))
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;; which takes a bit of time.
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"(key-data
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(public-key
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(rsa
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(n #00C1F764069F54FFE93A126B02328903E984E4AE3AF6DF402B5B6B3907911B88C385F1BA76A002EC9DEA109A5228EF0E62EE31A06D1A5861CAB474F6C857AC66EB65A1905F25BBA1869579E73A3B7FED13AF5A1667326F88CDFC2FF24B03C14FD1384AA7E73CA89572880B606E3A974E15347963FC7B6378574936A47580DBCB45#)
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(e #010001#)))
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(private-key
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(rsa
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(n #00C1F764069F54FFE93A126B02328903E984E4AE3AF6DF402B5B6B3907911B88C385F1BA76A002EC9DEA109A5228EF0E62EE31A06D1A5861CAB474F6C857AC66EB65A1905F25BBA1869579E73A3B7FED13AF5A1667326F88CDFC2FF24B03C14FD1384AA7E73CA89572880B606E3A974E15347963FC7B6378574936A47580DBCB45#)
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(e #010001#)
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(d #58CAD84653D0046A8EC3F9AA82D9C829B145422109FC3F12DA01A694B92FA296E70D366FB166454D30E632CEE3A033B4C41781BA10325F69FCDC0250CA19C8EEB352FA085992494098DB133E682ED38A931701F0DED1A1E508F4341A4FB446A04F019427C7CB3C44F251EEA9D386100DA80F125E0FD5CE1B0DFEC6D21516EACD#)
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(p #00D47F185147EC39393CCDA4E7323FFC20FC8B8073E2A54DD63BA392A66975E4204CA48572496A9DFD7522436B852C07472A5AB25B7706F7C14E6F33FBC420FF3B#)
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(q #00E9AD22F158060BC9AE3601DA623AFC60FFF3058795802CA92371C00097335CF9A23D7782DE353C9DBA93D7BB99E6A24A411107605E722481C5C191F80D7EB77F#)
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(u #59B45B95AE01A7A7370FAFDB08FE73A4793CE37F228961B09B1B1E7DDAD9F8D3E28F5C5E8B4B067E6B8E0BBF3F690B42991A79E46108DDCDA2514323A66964DE#))))")
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(test-begin "pk-crypto")
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(let ((sexps '("(foo bar)" "#C0FFEE#"
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"(genkey \n (rsa \n (nbits \"1024\")\n )\n )")))
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(test-equal "string->gcry-sexp->string"
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sexps
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(let ((sexps (map string->gcry-sexp sexps)))
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(and (every gcry-sexp? sexps)
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(map (compose string-trim-both gcry-sexp->string) sexps)))))
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(gc) ; stress test!
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(let ((sexps `(("(foo bar)" foo -> "(foo bar)")
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("(foo (bar (baz 3:123)))" baz -> "(baz \"123\")")
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("(foo (bar 3:123))" baz -> #f))))
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(test-equal "find-sexp-token"
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(map (match-lambda
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((_ _ '-> expected)
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expected))
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sexps)
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(map (match-lambda
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((input token '-> _)
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(let ((sexp (find-sexp-token (string->gcry-sexp input) token)))
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(and sexp
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(string-trim-both (gcry-sexp->string sexp))))))
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sexps)))
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(gc)
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;; XXX: The test below is typically too long as it needs to gather enough entropy.
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;; (test-assert "generate-key"
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;; (let ((key (generate-key (string->gcry-sexp
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;; "(genkey (rsa (nbits 3:128)))"))))
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;; (and (gcry-sexp? key)
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;; (find-sexp-token key 'key-data)
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;; (find-sexp-token key 'public-key)
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;; (find-sexp-token key 'private-key))))
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(test-assert "sign + verify"
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(let* ((pair (string->gcry-sexp %key-pair))
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(secret (find-sexp-token pair 'private-key))
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(public (find-sexp-token pair 'public-key))
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(data (bytevector->hash-data
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(sha256 (string->utf8 "Hello, world."))))
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(sig (sign data secret)))
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(and (verify sig data public)
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(not (verify sig
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(bytevector->hash-data
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(sha256 (string->utf8 "Hi!")))
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public)))))
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(gc)
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(test-end)
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(exit (= (test-runner-fail-count (test-runner-current)) 0))
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