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-rw-r--r--guix/pk-crypto.scm9
-rw-r--r--tests/pk-crypto.scm5
2 files changed, 12 insertions, 2 deletions
diff --git a/guix/pk-crypto.scm b/guix/pk-crypto.scm
index cf18faea04..d5b3eeb350 100644
--- a/guix/pk-crypto.scm
+++ b/guix/pk-crypto.scm
@@ -319,7 +319,14 @@ use pattern matching."
                                     result))
                             '()
                             sexp))
-      (canonical-sexp->string sexp)))             ; XXX: not very useful
+
+      ;; As of Libgcrypt 1.6.0, there's no function to extract the buffer of a
+      ;; non-list sexp (!), so we first enlist SEXP, then get at its buffer.
+      (let ((sexp (string->canonical-sexp
+                   (string-append "(" (canonical-sexp->string sexp)
+                                  ")"))))
+        (or (canonical-sexp-nth-data sexp 0)
+            (canonical-sexp-nth sexp 0)))))
 
 (define (sexp->canonical-sexp sexp)
   "Return a canonical sexp equivalent to SEXP, a Scheme sexp as returned by
diff --git a/tests/pk-crypto.scm b/tests/pk-crypto.scm
index de775d2e19..6774dd4157 100644
--- a/tests/pk-crypto.scm
+++ b/tests/pk-crypto.scm
@@ -203,7 +203,10 @@
                 (string-downcase
                  "00C1F764069F54FFE93A126B02328903E984E4AE3AF6DF402B5B6B3907911B88C385F1BA76A002EC9DEA109A5228EF0E62EE31A06D1A5861CAB474F6C857AC66EB65A1905F25BBA1869579E73A3B7FED13AF5A1667326F88CDFC2FF24B03C14FD1384AA7E73CA89572880B606E3A974E15347963FC7B6378574936A47580DBCB45")))
            (e ,(base16-string->bytevector
-                "010001")))))))
+                "010001"))))
+
+         ,(base16-string->bytevector
+           "2749f0ea9f26c6c7be746a9cff8fa4c2f2a02b000070dba78429e9a11f87c6eb"))))
   (test-equal "sexp->canonical-sexp->sexp"
     lst
     (map (compose canonical-sexp->sexp sexp->canonical-sexp)