2G ems initial

2024-03-13 09:30:40 +08:00
commit eed6460ad2
1234 changed files with 419571 additions and 0 deletions
--- a/include/nettle/base16.h
+++ b/include/nettle/base16.h
@@ -0,0 +1,110 @@
+/* base16.h
+   
+   Hex encoding and decoding, following spki conventions (i.e.
+   allowing whitespace between digits).
+
+   Copyright (C) 2002 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+ 
+#ifndef NETTLE_BASE16_H_INCLUDED
+#define NETTLE_BASE16_H_INCLUDED
+
+#include "nettle-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Name mangling */
+#define base16_encode_single nettle_base16_encode_single
+#define base16_encode_update nettle_base16_encode_update
+#define base16_decode_init nettle_base16_decode_init
+#define base16_decode_single nettle_base16_decode_single
+#define base16_decode_update nettle_base16_decode_update
+#define base16_decode_final nettle_base16_decode_final
+
+/* Base16 encoding */
+
+/* Maximum length of output for base16_encode_update. */
+#define BASE16_ENCODE_LENGTH(length) ((length) * 2)
+
+/* Encodes a single byte. Always stores two digits in dst[0] and dst[1]. */
+void
+base16_encode_single(char *dst,
+		     uint8_t src);
+
+/* Always stores BASE16_ENCODE_LENGTH(length) digits in dst. */
+void
+base16_encode_update(char *dst,
+		     size_t length,
+		     const uint8_t *src);
+
+
+/* Base16 decoding */
+
+/* Maximum length of output for base16_decode_update. */
+/* We have at most 4 buffered bits, and a total of (length + 1) * 4 bits. */
+#define BASE16_DECODE_LENGTH(length) (((length) + 1) / 2)
+
+struct base16_decode_ctx
+{
+  unsigned char word; /* Leftover bits */
+  unsigned char bits; /* Number buffered bits */
+};
+
+void
+base16_decode_init(struct base16_decode_ctx *ctx);
+
+/* Decodes a single byte. Returns amount of output (0 or 1), or -1 on
+ * errors. */
+int
+base16_decode_single(struct base16_decode_ctx *ctx,
+		     uint8_t *dst,
+		     char src);
+
+/* Returns 1 on success, 0 on error. DST should point to an area of
+ * size at least BASE16_DECODE_LENGTH(length). The amount of data
+ * generated is returned in *DST_LENGTH. */
+
+int
+base16_decode_update(struct base16_decode_ctx *ctx,
+		     size_t *dst_length,
+		     uint8_t *dst,
+		     size_t src_length,
+		     const char *src);
+
+/* Returns 1 on success. */
+int
+base16_decode_final(struct base16_decode_ctx *ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_BASE16_H_INCLUDED */