2 files changed, 22 insertions, 0 deletions

diff --git a/src/otputil.c b/src/otputil.c
index 134f2e2..628fdf6 100644
--- a/src/otputil.c
+++ b/src/otputil.c
@@ -177,6 +177,16 @@ static otputil_widget_t otputil_widget_map[] =
       .func_exec  = &otputil_widget_hotp,
       .func_usage = NULL,
    },
+   {  .name       = "hotp-sha1",
+      .desc       = NULL,
+      .usage      = " [ code ]",
+      .short_opt  = (TOTP_SHORT_OPT "c:d:k:O:o"),
+      .arg_min    = 0,
+      .arg_max    = 1,
+      .aliases    = (const char *[]){ "hotp-sha256", "hotp-sha512", NULL },
+      .func_exec  = &otputil_widget_hotp,
+      .func_usage = NULL,
+   },
 
    // OTP widget and aliases
    {  .name       = "otp",
diff --git a/src/widget-hotp.c b/src/widget-hotp.c
index 535d543..f6e308a 100644
--- a/src/widget-hotp.c
+++ b/src/widget-hotp.c
@@ -99,6 +99,7 @@ otputil_widget_hotp(
          otputil_config_t *            cnf )
 {
    int            rc;
+   int            hash;
    uint64_t       meth;
 
    assert(cnf != NULL);
@@ -111,6 +112,17 @@ otputil_widget_hotp(
       return(1);
    };
 
+   // set default hash
+   if (!(strncasecmp(cnf->argv[0], "hotp-", 5)))
+   {
+      if ((hash = otputil_str2md(&cnf->argv[0][5])) == -1)
+      {
+         fprintf(stderr, "%s: unsupported hash algorithm\n", cnf->prog_name);
+         return(1);
+      };
+      otputil_set_param(NULL, OTPUTIL_OPT_HOTP_HMAC, &hash);
+   };
+
    // initial processing of cli arguments
    if ((rc = otputil_arguments(cnf, cnf->argc, cnf->argv)) != 0)
       return((rc == -1) ? 0 : 1);