diff --git a/includes/internal/cli/interactive.h b/includes/internal/cli/interactive.h
new file mode 100644
index 0000000..77f7503
--- /dev/null
+++ b/includes/internal/cli/interactive.h
@@ -0,0 +1,8 @@
+#ifndef FT_SSL_INTERACTIVE_H
+#define FT_SSL_INTERACTIVE_H
+
+#include <cli.h>
+
+enum cli_code	run_interactive(void);
+
+#endif
diff --git a/src/Makefile.am b/src/Makefile.am
index 2d348e3..217dbfd 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -48,6 +48,7 @@ ft_ssl_SOURCES				= \
 							  ssl/digest.c \
 							  ssl/output.c \
 							  cli/parse.c \
+							  cli/interactive.c \
 							  cli/handlers/option_map.c \
 							  cli/handlers/handle_help.c \
 							  cli/handlers/handle_version.c \
diff --git a/src/cli/interactive.c b/src/cli/interactive.c
new file mode 100644
index 0000000..f5a7d3d
--- /dev/null
+++ b/src/cli/interactive.c
@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <cli.h>
+#include <libft_ssl.h>
+
+#include "ft_ssl.h"
+#include "internal/cli/interactive.h"
+
+#define INTERACTIVE_BUFSIZ 4096
+
+static const struct digest_algo * const	s_algos[] = {
+#define DIGEST_ALGO(lower, ds, bs)	&g_##lower,
+#include <digest_algos.h>
+#undef DIGEST_ALGO
+	NULL
+};
+
+static const struct digest_algo	*find_algo(const char *name);
+static void						print_available(void);
+
+enum cli_code
+run_interactive(void)
+{
+	char				buf[INTERACTIVE_BUFSIZ];
+	char				*sep;
+	const struct digest_algo	*algo;
+	struct ssl_config		config;
+
+	while (fgets(buf, (int)sizeof(buf), stdin))
+	{
+		buf[strcspn(buf, "\n")] = '\0';
+		if (buf[0] == '\0')
+			continue;
+		sep = buf;
+		while (*sep && *sep != ' ' && *sep != '\t')
+			sep++;
+		if (*sep)
+		{
+			*sep = '\0';
+			sep++;
+			while (*sep == ' ' || *sep == '\t')
+				sep++;
+		}
+		algo = find_algo(buf);
+		if (!algo)
+		{
+			fprintf(stderr, "ft_ssl: unknown command -- '%s'\n", buf);
+			print_available();
+			continue;
+		}
+		memset(&config, 0, sizeof(config));
+		config.algo = algo;
+		config.string = (*sep != '\0') ? sep : NULL;
+		ssl_run(&config);
+	}
+	return CLI_EXIT_SUCCESS;
+}
+
+static const struct digest_algo *
+find_algo(const char *name)
+{
+	size_t	i;
+
+	for (i = 0; s_algos[i]; i++)
+	{
+		if (strcmp(s_algos[i]->name, name) == 0)
+			return s_algos[i];
+	}
+	return NULL;
+}
+
+static void
+print_available(void)
+{
+	size_t	i;
+
+	fprintf(stderr, "available commands:");
+	for (i = 0; s_algos[i]; i++)
+		fprintf(stderr, " %s", s_algos[i]->name);
+	fprintf(stderr, "\n");
+}
diff --git a/src/cli/parse.c b/src/cli/parse.c
index 7c92d3f..cfac06b 100644
--- a/src/cli/parse.c
+++ b/src/cli/parse.c
@@ -7,6 +7,7 @@
 
 #include "ft_ssl.h"
 #include "internal/cli/cli_handlers.h"
+#include "internal/cli/interactive.h"
 #include "internal/cli/option.h"
 
 /* Forward declarations */
@@ -43,11 +44,7 @@ parse_subcommand(int argc, char **argv, int first_arg,
 		struct ssl_config *config)
 {
 	if (first_arg >= argc)
-	{
-		fprintf(stderr, "%s: missing command\n", argv[0]);
-		print_usage(argv[0]);
-		return CLI_ERROR;
-	}
+		return run_interactive();
 	config->algo = find_algo(argv[first_arg]);
 	if (NULL == config->algo)
 	{