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-rw-r--r--gnu/services/base.scm18
1 files changed, 18 insertions, 0 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 5e08927af3..a3654fd4d3 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -516,6 +516,24 @@ stopped before 'kill' is called."
(call-with-output-file "/dev/urandom"
(lambda (urandom)
(dump-port seed urandom))))))
+
+ ;; Try writing from /dev/hwrng into /dev/urandom.
+ ;; It seems that the file /dev/hwrng always exists, even
+ ;; when there is no hardware random number generator
+ ;; available. So, we handle a failed read or any other error
+ ;; reported by the operating system.
+ (let ((buf (catch 'system-error
+ (lambda ()
+ (call-with-input-file "/dev/hwrng"
+ (lambda (hwrng)
+ (get-bytevector-n hwrng 512))))
+ ;; Silence is golden...
+ (const #f))))
+ (when buf
+ (call-with-output-file "/dev/urandom"
+ (lambda (urandom)
+ (put-bytevector urandom buf)))))
+
;; Immediately refresh the seed in case the system doesn't
;; shut down cleanly.
(call-with-input-file "/dev/urandom"