1 files changed, 62 insertions, 0 deletions
diff --git a/src/base64.c b/src/base64.c
new file mode 100644
index 0000000..f7fa3c4
--- /dev/null
+++ b/src/base64.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2023 Egor Tensin <Egor.Tensin@gmail.com>
+ * This file is part of the "cimple" project.
+ * For details, see https://github.com/egor-tensin/cimple.
+ * Distributed under the MIT License.
+ */
+
+#include "base64.h"
+#include "log.h"
+
+#include <sodium.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const int base64_variant = sodium_base64_VARIANT_ORIGINAL;
+
+int base64_encode(const unsigned char *src, size_t src_len, char **_dst)
+{
+	const size_t dst_len = sodium_base64_encoded_len(src_len, base64_variant);
+
+	char *dst = calloc(dst_len, 1);
+	if (!dst) {
+		log_errno("calloc");
+		return -1;
+	}
+
+	sodium_bin2base64(dst, dst_len, src, src_len, base64_variant);
+
+	*_dst = dst;
+	return 0;
+}
+
+int base64_decode(const char *src, unsigned char **_dst, size_t *_dst_len)
+{
+	const size_t src_len = strlen(src);
+	const size_t dst_max_len = src_len / 4 * 3;
+	size_t dst_len = 0;
+
+	unsigned char *dst = calloc(dst_max_len, 1);
+	if (!dst) {
+		log_errno("calloc");
+		return -1;
+	}
+
+	int ret =
+	    sodium_base642bin(dst, dst_max_len, src, src_len, NULL, &dst_len, NULL, base64_variant);
+	if (ret < 0) {
+		log_err("Couldn't parse base64-encoded string\n");
+		goto free;
+	}
+
+	*_dst = dst;
+	*_dst_len = dst_len;
+	return ret;
+
+free:
+	free(dst);
+
+	return ret;
+}