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Add (guix pk-crypto).

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* guix/pk-crypto.scm, tests/pk-crypto.scm: New files.
* Makefile.am (MODULES, SCM_TESTS): Add them.
This commit is contained in:
Ludovic Courtès 2013-12-20 00:36:26 +01:00
parent b1aa25be00
commit 3476ded934
3 changed files with 275 additions and 0 deletions
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2
Makefile.am
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@ -30,6 +30,7 @@ MODULES = \
guix/base32.scm \ guix/base32.scm \
guix/records.scm \ guix/records.scm \
guix/hash.scm \ guix/hash.scm \
guix/pk-crypto.scm \
guix/utils.scm \ guix/utils.scm \
guix/download.scm \ guix/download.scm \
guix/monads.scm \ guix/monads.scm \
@ -107,6 +108,7 @@ clean-go:
SCM_TESTS = \ SCM_TESTS = \
tests/base32.scm \ tests/base32.scm \
tests/hash.scm \ tests/hash.scm \
tests/pk-crypto.scm \
tests/builders.scm \ tests/builders.scm \
tests/derivations.scm \ tests/derivations.scm \
tests/ui.scm \ tests/ui.scm \

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guix/pk-crypto.scm Normal file
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@ -0,0 +1,167 @@
;;; 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 (guix pk-crypto)
#:use-module (guix config)
#:use-module ((guix utils) #:select (bytevector->base16-string))
#:use-module (system foreign)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:export (gcry-sexp?
string->gcry-sexp
gcry-sexp->string
number->gcry-sexp
bytevector->hash-data
sign
verify
generate-key
find-sexp-token))
;;; Commentary:
;;;
;;; Public key cryptographic routines from GNU Libgcrypt.
;;;;
;;; Libgcrypt uses s-expressions to represent key material, parameters, and
;;; data. We keep it as an opaque object rather than attempting to map them
;;; to Scheme s-expressions because (1) Libgcrypt sexps are stored in secure
;;; memory, and (2) the read syntax is different.
;;;
;;; Code:
;; Libgcrypt "s-expressions".
(define-wrapped-pointer-type <gcry-sexp>
gcry-sexp?
naked-pointer->gcry-sexp
gcry-sexp->pointer
(lambda (obj port)
;; Don't print OBJ's external representation: we don't want key material
;; to leak in backtraces and such.
(format port "#<gcry-sexp ~a | ~a>"
(number->string (object-address obj) 16)
(number->string (pointer-address (gcry-sexp->pointer obj))
16))))
(define libgcrypt-func
(let ((lib (dynamic-link %libgcrypt)))
(lambda (func)
"Return a pointer to symbol FUNC in libgcrypt."
(dynamic-func func lib))))
(define finalize-gcry-sexp!
(libgcrypt-func "gcry_sexp_release"))
(define-inlinable (pointer->gcry-sexp ptr)
"Return a <gcry-sexp> that wraps PTR."
(let* ((sexp (naked-pointer->gcry-sexp ptr))
(ptr* (gcry-sexp->pointer sexp)))
;; Did we already have a <gcry-sexp> object for PTR?
(when (equal? ptr ptr*)
;; No, so we can safely add a finalizer (in Guile 2.0.9
;; 'set-pointer-finalizer!' *adds* a finalizer rather than replacing the
;; existing one.)
(set-pointer-finalizer! ptr finalize-gcry-sexp!))
sexp))
(define string->gcry-sexp
(let* ((ptr (libgcrypt-func "gcry_sexp_new"))
(proc (pointer->procedure int ptr `(* * ,size_t ,int))))
(lambda (str)
"Parse STR and return the corresponding gcrypt s-expression."
(let* ((sexp (bytevector->pointer (make-bytevector (sizeof '*))))
(err (proc sexp (string->pointer str) 0 1)))
(if (= 0 err)
(pointer->gcry-sexp (dereference-pointer sexp))
(throw 'gcry-error err))))))
(define-syntax GCRYSEXP_FMT_ADVANCED
(identifier-syntax 3))
(define gcry-sexp->string
(let* ((ptr (libgcrypt-func "gcry_sexp_sprint"))
(proc (pointer->procedure size_t ptr `(* ,int * ,size_t))))
(lambda (sexp)
"Return a textual representation of SEXP."
(let loop ((len 1024))
(let* ((buf (bytevector->pointer (make-bytevector len)))
(size (proc (gcry-sexp->pointer sexp)
GCRYSEXP_FMT_ADVANCED buf len)))
(if (zero? size)
(loop (* len 2))
(pointer->string buf size "ISO-8859-1")))))))
(define (number->gcry-sexp number)
"Return an s-expression representing NUMBER."
(string->gcry-sexp (string-append "#" (number->string number 16) "#")))
(define* (bytevector->hash-data bv #:optional (hash-algo "sha256"))
"Given BV, a bytevector containing a hash, return an s-expression suitable
for use as the data for 'sign'."
(string->gcry-sexp
(format #f "(data (flags pkcs1) (hash \"~a\" #~a#))"
hash-algo
(bytevector->base16-string bv))))
(define sign
(let* ((ptr (libgcrypt-func "gcry_pk_sign"))
(proc (pointer->procedure int ptr '(* * *))))
(lambda (data secret-key)
"Sign DATA (an s-expression) with SECRET-KEY (an s-expression whose car
is 'private-key'.)"
(let* ((sig (bytevector->pointer (make-bytevector (sizeof '*))))
(err (proc sig (gcry-sexp->pointer data)
(gcry-sexp->pointer secret-key))))
(if (= 0 err)
(pointer->gcry-sexp (dereference-pointer sig))
(throw 'gry-error err))))))
(define verify
(let* ((ptr (libgcrypt-func "gcry_pk_verify"))
(proc (pointer->procedure int ptr '(* * *))))
(lambda (signature data public-key)
"Verify that SIGNATURE is a signature of DATA with PUBLIC-KEY, all of
which are gcrypt s-expressions."
(zero? (proc (gcry-sexp->pointer signature)
(gcry-sexp->pointer data)
(gcry-sexp->pointer public-key))))))
(define generate-key
(let* ((ptr (libgcrypt-func "gcry_pk_genkey"))
(proc (pointer->procedure int ptr '(* *))))
(lambda (params)
"Return as an s-expression a new key pair for PARAMS. PARAMS must be an
s-expression like: (genkey (rsa (nbits 4:2048)))."
(let* ((key (bytevector->pointer (make-bytevector (sizeof '*))))
(err (proc key (gcry-sexp->pointer params))))
(if (zero? err)
(pointer->gcry-sexp (dereference-pointer key))
(throw 'gcry-error err))))))
(define find-sexp-token
(let* ((ptr (libgcrypt-func "gcry_sexp_find_token"))
(proc (pointer->procedure '* ptr `(* * ,size_t))))
(lambda (sexp token)
"Find in SEXP the first element whose 'car' is TOKEN and return it;
return #f if not found."
(let* ((token (string->pointer (symbol->string token)))
(res (proc (gcry-sexp->pointer sexp) token 0)))
(if (null-pointer? res)
#f
(pointer->gcry-sexp res))))))
;;; pk-crypto.scm ends here

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@ -0,0 +1,106 @@
;;; 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-pk-crypto)
#:use-module (guix pk-crypto)
#:use-module (guix utils)
#:use-module (guix hash)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-64)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports)
#:use-module (ice-9 match))
;; Test the (guix pk-crypto) module.
(define %key-pair
;; Key pair that was generated with:
;; (generate-key (string->gcry-sexp "(genkey (rsa (nbits 4:1024)))"))
;; which takes a bit of time.
"(key-data
(public-key
(rsa
(n #00C1F764069F54FFE93A126B02328903E984E4AE3AF6DF402B5B6B3907911B88C385F1BA76A002EC9DEA109A5228EF0E62EE31A06D1A5861CAB474F6C857AC66EB65A1905F25BBA1869579E73A3B7FED13AF5A1667326F88CDFC2FF24B03C14FD1384AA7E73CA89572880B606E3A974E15347963FC7B6378574936A47580DBCB45#)
(e #010001#)))
(private-key
(rsa
(n #00C1F764069F54FFE93A126B02328903E984E4AE3AF6DF402B5B6B3907911B88C385F1BA76A002EC9DEA109A5228EF0E62EE31A06D1A5861CAB474F6C857AC66EB65A1905F25BBA1869579E73A3B7FED13AF5A1667326F88CDFC2FF24B03C14FD1384AA7E73CA89572880B606E3A974E15347963FC7B6378574936A47580DBCB45#)
(e #010001#)
(d #58CAD84653D0046A8EC3F9AA82D9C829B145422109FC3F12DA01A694B92FA296E70D366FB166454D30E632CEE3A033B4C41781BA10325F69FCDC0250CA19C8EEB352FA085992494098DB133E682ED38A931701F0DED1A1E508F4341A4FB446A04F019427C7CB3C44F251EEA9D386100DA80F125E0FD5CE1B0DFEC6D21516EACD#)
(p #00D47F185147EC39393CCDA4E7323FFC20FC8B8073E2A54DD63BA392A66975E4204CA48572496A9DFD7522436B852C07472A5AB25B7706F7C14E6F33FBC420FF3B#)
(q #00E9AD22F158060BC9AE3601DA623AFC60FFF3058795802CA92371C00097335CF9A23D7782DE353C9DBA93D7BB99E6A24A411107605E722481C5C191F80D7EB77F#)
(u #59B45B95AE01A7A7370FAFDB08FE73A4793CE37F228961B09B1B1E7DDAD9F8D3E28F5C5E8B4B067E6B8E0BBF3F690B42991A79E46108DDCDA2514323A66964DE#))))")
(test-begin "pk-crypto")
(let ((sexps '("(foo bar)" "#C0FFEE#"
"(genkey \n (rsa \n (nbits \"1024\")\n )\n )")))
(test-equal "string->gcry-sexp->string"
sexps
(let ((sexps (map string->gcry-sexp sexps)))
(and (every gcry-sexp? sexps)
(map (compose string-trim-both gcry-sexp->string) sexps)))))
(gc) ; stress test!
(let ((sexps `(("(foo bar)" foo -> "(foo bar)")
("(foo (bar (baz 3:123)))" baz -> "(baz \"123\")")
("(foo (bar 3:123))" baz -> #f))))
(test-equal "find-sexp-token"
(map (match-lambda
((_ _ '-> expected)
expected))
sexps)
(map (match-lambda
((input token '-> _)
(let ((sexp (find-sexp-token (string->gcry-sexp input) token)))
(and sexp
(string-trim-both (gcry-sexp->string sexp))))))
sexps)))
(gc)
;; XXX: The test below is typically too long as it needs to gather enough entropy.
;; (test-assert "generate-key"
;; (let ((key (generate-key (string->gcry-sexp
;; "(genkey (rsa (nbits 3:128)))"))))
;; (and (gcry-sexp? key)
;; (find-sexp-token key 'key-data)
;; (find-sexp-token key 'public-key)
;; (find-sexp-token key 'private-key))))
(test-assert "sign + verify"
(let* ((pair (string->gcry-sexp %key-pair))
(secret (find-sexp-token pair 'private-key))
(public (find-sexp-token pair 'public-key))
(data (bytevector->hash-data
(sha256 (string->utf8 "Hello, world."))))
(sig (sign data secret)))
(and (verify sig data public)
(not (verify sig
(bytevector->hash-data
(sha256 (string->utf8 "Hi!")))
public)))))
(gc)
(test-end)
(exit (= (test-runner-fail-count (test-runner-current)) 0))