1 files changed, 88 insertions, 0 deletions
diff --git a/usr.sbin/rpki-client/encoding.c b/usr.sbin/rpki-client/encoding.c
new file mode 100644
index 00000000000..4afe7946183
--- /dev/null
+++ b/usr.sbin/rpki-client/encoding.c
@@ -0,0 +1,88 @@
+/*      $OpenBSD: encoding.c,v 1.1 2021/04/01 06:43:23 claudio Exp $  */
+/*
+ * Copyright (c) 2020 Claudio Jeker <claudio@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <err.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <openssl/evp.h>
+
+#include "extern.h"
+
+/*
+ * Decode base64 encoded string into binary buffer returned in out.
+ * The out buffer size is stored in outlen.
+ * Returns 0 on success or -1 for any errors.
+ */
+int
+base64_decode(const unsigned char *in, unsigned char **out, size_t *outlen)
+{
+	static EVP_ENCODE_CTX *ctx;
+	unsigned char *to;
+	size_t inlen;
+	int tolen;
+
+	if (ctx == NULL && (ctx = EVP_ENCODE_CTX_new()) == NULL)
+		err(1, "EVP_ENCODE_CTX_new");
+
+	*out = NULL;
+	*outlen = 0;
+
+	inlen = strlen(in);
+	if (inlen >= INT_MAX - 3)
+		return -1;
+	tolen = ((inlen + 3) / 4) * 3 + 1;
+	if ((to = malloc(tolen)) == NULL)
+		return -1;
+
+	EVP_DecodeInit(ctx);
+	if (EVP_DecodeUpdate(ctx, to, &tolen, in, inlen) == -1)
+		goto fail;
+	*outlen = tolen;
+	if (EVP_DecodeFinal(ctx, to + tolen, &tolen) == -1)
+		goto fail;
+	*outlen += tolen;
+	*out = to;
+	return 0;
+
+fail:
+	free(to);
+	return -1;
+}
+
+/*
+ * Convert binary buffer of size dsz into an upper-case hex-string.
+ * Returns pointer to the newly allocated string. Function can't fail.
+ */
+char *
+hex_encode(const unsigned char *in, size_t insz)
+{
+	const char hex[] = "0123456789ABCDEF";
+	size_t i;
+	char *out;
+
+	if ((out = calloc(2, insz + 1)) == NULL)
+		err(1, NULL);
+
+	for (i = 0; i < insz; i++) {
+		out[i * 2] = hex[in[i] >> 4];
+		out[i * 2 + 1] = hex[in[i] & 0xf];
+	}
+	out[i * 2] = '\0';
+
+	return out;
+}