X-Git-Url: https://git.distorted.org.uk/~mdw/distorted-keys/blobdiff_plain/600916867dd4f7e6129f8c1ebbc84134fbf9f9f2..2661d8aa033971c32f45392fc70e42f0d9a2c14e:/keyfunc.sh.in

diff --git a/keyfunc.sh.in b/keyfunc.sh.in
index 0256dc0..a618e66 100644
--- a/keyfunc.sh.in
+++ b/keyfunc.sh.in
@@ -557,6 +557,31 @@ c_sysverify () { c_sysop verify "$1" /dev/null; }
 ###--------------------------------------------------------------------------
 ### Recovery operations.
 
+sharethresh () {
+  pf=$1
+  ## Return the sharing threshold from the parameter file PARAM.
+
+  read param <"$pf"
+  case "$param" in
+    shamir-params:*) ;;
+    *)
+      echo >&2 "$quis: secret sharing parameter file damaged (wrong header)"
+      exit 1
+      ;;
+  esac
+  t=";${param#*:}"
+  case "$t" in
+    *";t="*) ;;
+    *)
+      echo >&2 "$quis: secret sharing parameter file damaged (missing t)"
+      exit 1
+      ;;
+  esac
+  t=${t#*;t=}
+  t=${t%%;*}
+  echo "$t"
+}
+
 stash () {
   recov=$1 label=$2
   ## Stash a copy of stdin encrypted under the recovery key RECOV, with a