1 files changed, 31 insertions, 0 deletions
diff --git a/libar2_encode_params.c b/libar2_encode_params.c
new file mode 100644
index 0000000..cdf634a
--- /dev/null
+++ b/libar2_encode_params.c
@@ -0,0 +1,31 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+size_t
+libar2_encode_params(char *buf, const struct libar2_argon2_parameters *params)
+{
+	size_t off;
+
+#define FMT_AND_ARGS\
+	"$%s$v=%i$m=%ju,t=%ju,p=%ju$",\
+	libar2_type_to_string(params->type, LIBAR2_LOWER_CASE),\
+	(int)params->version,\
+	(uintmax_t)params->m_cost,\
+	(uintmax_t)params->t_cost,\
+	(uintmax_t)params->lanes
+
+	if (buf) {
+		off = (size_t)sprintf(buf, FMT_AND_ARGS);
+		off += libar2_encode_base64(&buf[off], params->salt, params->saltlen) - 1;
+		buf[off++] = '$';
+		buf[off++] = '\0';
+
+	} else {
+		off = (size_t)snprintf(NULL, 0, FMT_AND_ARGS);
+		off += libar2_encode_base64(NULL, params->salt, params->saltlen) - 1;
+		off += 2;
+	}
+
+	return off;
+}