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diff --git a/tests/pk-crypto.scm b/tests/pk-crypto.scm
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+++ b/tests/pk-crypto.scm
@@ -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))