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authorLudovic Courtès <ludo@gnu.org>2014-03-20 22:33:52 +0100
committerLudovic Courtès <ludo@gnu.org>2014-03-20 23:06:47 +0100
commit1fda6840a892e55b579dfeb8f4590b5cd2874662 (patch)
treee4abf299e7bfa8df30ec6ca743a761e09d744923 /guix
parent2f66e64c53ccae423a791b51cd635ad892f0feab (diff)
pk-crypto: Don't use Ed25519 when libgcrypt is older than 1.6.0.
* guix/pk-crypto.scm (gcrypt-version): New procedure. * guix/scripts/archive.scm (%key-generation-parameters): New variable. (%options) <generate-key>: Use it. * tests/pk-crypto.scm ("sign + verify, Ed25519"): Skip if using gcrypt < 1.6.0.
Diffstat (limited to 'guix')
-rw-r--r--guix/pk-crypto.scm14
-rw-r--r--guix/scripts/archive.scm10
2 files changed, 21 insertions, 3 deletions
diff --git a/guix/pk-crypto.scm b/guix/pk-crypto.scm
index b9ab02861c..481d3f2463 100644
--- a/guix/pk-crypto.scm
+++ b/guix/pk-crypto.scm
@@ -24,7 +24,8 @@
#:use-module (system foreign)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
- #:export (canonical-sexp?
+ #:export (gcrypt-version
+ canonical-sexp?
error-source
error-string
string->canonical-sexp
@@ -86,6 +87,17 @@
"Return a pointer to symbol FUNC in libgcrypt."
(dynamic-func func lib))))
+(define gcrypt-version
+ ;; According to the manual, this function must be called before any other,
+ ;; and it's not clear whether it can be called more than once. So call it
+ ;; right here from the top level.
+ (let* ((ptr (libgcrypt-func "gcry_check_version"))
+ (proc (pointer->procedure '* ptr '(*)))
+ (version (pointer->string (proc %null-pointer))))
+ (lambda ()
+ "Return the version number of libgcrypt as a string."
+ version)))
+
(define finalize-canonical-sexp!
(libgcrypt-func "gcry_sexp_release"))
diff --git a/guix/scripts/archive.scm b/guix/scripts/archive.scm
index 0e67321026..c900fcecb9 100644
--- a/guix/scripts/archive.scm
+++ b/guix/scripts/archive.scm
@@ -87,6 +87,13 @@ Export/import one or more packages from/to the store.\n"))
(newline)
(show-bug-report-information))
+(define %key-generation-parameters
+ ;; Default key generation parameters. We prefer Ed25519, but it was
+ ;; introduced in libgcrypt 1.6.0.
+ (if (version>? (gcrypt-version) "1.6.0")
+ "(genkey (ecdsa (curve Ed25519) (flags rfc6979)))"
+ "(genkey (rsa (nbits 4:4096)))"))
+
(define %options
;; Specifications of the command-line options.
(cons* (option '(#\h "help") #f #f
@@ -114,8 +121,7 @@ Export/import one or more packages from/to the store.\n"))
;; libgcrypt 1.6.0.
(let ((params
(string->canonical-sexp
- (or arg "\
- (genkey (ecdsa (curve Ed25519) (flags rfc6979)))"))))
+ (or arg %key-generation-parameters))))
(alist-cons 'generate-key params result)))
(lambda (key err)
(leave (_ "invalid key generation parameters: ~a: ~a~%")