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-rw-r--r--guix/pk-crypto.scm14
-rw-r--r--guix/scripts/archive.scm10
-rw-r--r--tests/pk-crypto.scm2
3 files changed, 23 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~%")
diff --git a/tests/pk-crypto.scm b/tests/pk-crypto.scm
index 4d498020f5..294c7f3df8 100644
--- a/tests/pk-crypto.scm
+++ b/tests/pk-crypto.scm
@@ -184,6 +184,8 @@
#:key-type (key-type public))
public)))))
+;; Ed25519 appeared in libgcrypt 1.6.0.
+(test-skip (if (version>? (gcrypt-version) "1.6.0") 0 1))
(test-assert "sign + verify, Ed25519"
(let* ((pair (string->canonical-sexp %ecc-key-pair))
(secret (find-sexp-token pair 'private-key))