1 files changed, 59 insertions, 0 deletions
diff --git a/libar2simplified_encode.c b/libar2simplified_encode.c
new file mode 100644
index 0000000..054e574
--- /dev/null
+++ b/libar2simplified_encode.c
@@ -0,0 +1,59 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+static size_t
+encode_params(char *buf, size_t bufsize, const struct libar2_argon2_parameters *params)
+{
+	if (params->salt) {
+		return libar2_encode_params(buf, params);
+	}
+
+	return 1 + (size_t)snprintf(buf, bufsize, "$%s$v=%i$m=%lu,t=%lu,p=%lu$*%zu$",
+	                            libar2_type_to_string(params->type, LIBAR2_LOWER_CASE),
+	                            (int)params->version,
+	                            (unsigned long int)params->m_cost,
+	                            (unsigned long int)params->t_cost,
+	                            (unsigned long int)params->lanes,
+	                            params->saltlen);
+}
+
+
+char *
+libar2simplified_encode(const struct libar2_argon2_parameters *params_, void *hash)
+{
+	struct libar2_argon2_parameters params = *params_;
+	size_t size, off;
+	char *ret;
+
+	if (libar2_validate_params(&params, NULL) != LIBAR2_OK) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	size = encode_params(NULL, 0, &params);
+	if (hash)
+		size += libar2_encode_base64(NULL, NULL, params.hashlen) - 1;
+	else
+		size += (size_t)snprintf(NULL, 0, "*%zu", params.hashlen);
+
+	ret = malloc(size);
+	if (!ret) {
+		errno = ENOMEM;
+		return NULL;
+	}
+
+	off = encode_params(ret, size, &params) - 1;
+	if (off > size - 1)
+		abort();
+
+	if (hash)
+		off += libar2_encode_base64(&ret[off], hash, params.hashlen) - 1;
+	else
+		off += (size_t)sprintf(&ret[off], "*%zu", params.hashlen);
+
+	if (off > size - 1)
+		abort();
+
+	return ret;
+}