[libsecret/wip/dueno/local-file: 1/8] egg: Add egg-base64 module for base64url encoding
- From: Daiki Ueno <dueno src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [libsecret/wip/dueno/local-file: 1/8] egg: Add egg-base64 module for base64url encoding
- Date: Tue, 2 Oct 2018 19:04:35 +0000 (UTC)
commit cf1751d511e3007a4c99b354d4af1c256718e42b
Author: Daiki Ueno <dueno src gnome org>
Date: Thu Sep 20 13:57:40 2018 +0200
egg: Add egg-base64 module for base64url encoding
egg/Makefile.am | 5 +
egg/egg-base64.c | 275 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
egg/egg-base64.h | 34 +++++++
egg/test-base64.c | 71 ++++++++++++++
4 files changed, 385 insertions(+)
---
diff --git a/egg/Makefile.am b/egg/Makefile.am
index dc136a8..2c647f7 100644
--- a/egg/Makefile.am
+++ b/egg/Makefile.am
@@ -12,6 +12,7 @@ ENCRYPTION_SRCS =
endif
libegg_la_SOURCES = \
+ egg/egg-base64.c egg/egg-base64.h \
egg/egg-hex.c egg/egg-hex.h \
egg/egg-secure-memory.c egg/egg-secure-memory.h \
egg/egg-testing.c egg/egg-testing.h \
@@ -23,9 +24,13 @@ egg_LIBS = \
$(GLIB_LIBS)
egg_TESTS = \
+ test-base64 \
test-hex \
test-secmem
+test_base64_SOURCES = egg/test-base64.c
+test_base64_LDADD = $(egg_LIBS)
+
test_hex_SOURCES = egg/test-hex.c
test_hex_LDADD = $(egg_LIBS)
diff --git a/egg/egg-base64.c b/egg/egg-base64.c
new file mode 100644
index 0000000..e0e8e22
--- /dev/null
+++ b/egg/egg-base64.c
@@ -0,0 +1,275 @@
+/* egg-base64.c - Base64 encoding/decoding
+ *
+ * Copyright (C) 2006 Alexander Larsson <alexl redhat com>
+ * Copyright (C) 2000-2003 Ximian Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * This is based on code in camel, written by:
+ * Michael Zucchi <notzed ximian com>
+ * Jeffrey Stedfast <fejj ximian com>
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include "egg-base64.h"
+
+/* This is a copy of glib/glib/gbase64.c. The only difference is that
+ this version uses URL- and filename-safe alphabets as described in
+ RFC4848 and omits padding and line breaks, for the use with JWE. */
+
+static const char base64_alphabet[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+static gsize
+egg_base64_encode_step (const guchar *in,
+ gsize len,
+ gchar *out,
+ gint *state,
+ gint *save)
+{
+ char *outptr;
+ const guchar *inptr;
+
+ g_return_val_if_fail (in != NULL, 0);
+ g_return_val_if_fail (out != NULL, 0);
+ g_return_val_if_fail (state != NULL, 0);
+ g_return_val_if_fail (save != NULL, 0);
+
+ if (len <= 0)
+ return 0;
+
+ inptr = in;
+ outptr = out;
+
+ if (len + ((char *) save) [0] > 2)
+ {
+ const guchar *inend = in+len-2;
+ int c1, c2, c3;
+ int already;
+
+ already = *state;
+
+ switch (((char *) save) [0])
+ {
+ case 1:
+ c1 = ((unsigned char *) save) [1];
+ goto skip1;
+ case 2:
+ c1 = ((unsigned char *) save) [1];
+ c2 = ((unsigned char *) save) [2];
+ goto skip2;
+ }
+
+ /*
+ * yes, we jump into the loop, no i'm not going to change it,
+ * it's beautiful!
+ */
+ while (inptr < inend)
+ {
+ c1 = *inptr++;
+ skip1:
+ c2 = *inptr++;
+ skip2:
+ c3 = *inptr++;
+ *outptr++ = base64_alphabet [ c1 >> 2 ];
+ *outptr++ = base64_alphabet [ c2 >> 4 |
+ ((c1&0x3) << 4) ];
+ *outptr++ = base64_alphabet [ ((c2 &0x0f) << 2) |
+ (c3 >> 6) ];
+ *outptr++ = base64_alphabet [ c3 & 0x3f ];
+ }
+
+ ((char *)save)[0] = 0;
+ len = 2 - (inptr - inend);
+ *state = already;
+ }
+
+ if (len>0)
+ {
+ char *saveout;
+
+ /* points to the slot for the next char to save */
+ saveout = & (((char *)save)[1]) + ((char *)save)[0];
+
+ /* len can only be 0 1 or 2 */
+ switch(len)
+ {
+ case 2: *saveout++ = *inptr++;
+ case 1: *saveout++ = *inptr++;
+ }
+ ((char *)save)[0] += len;
+ }
+
+ return outptr - out;
+}
+
+static gsize
+egg_base64_encode_close (gchar *out,
+ gint *state,
+ gint *save)
+{
+ int c1, c2;
+ char *outptr = out;
+
+ g_return_val_if_fail (out != NULL, 0);
+ g_return_val_if_fail (state != NULL, 0);
+ g_return_val_if_fail (save != NULL, 0);
+
+ c1 = ((unsigned char *) save) [1];
+ c2 = ((unsigned char *) save) [2];
+
+ switch (((char *) save) [0])
+ {
+ case 2:
+ outptr [0] = base64_alphabet [ c1 >> 2 ];
+ outptr [1] = base64_alphabet [ c2 >> 4 | ( (c1&0x3) << 4 ) ];
+ outptr [2] = base64_alphabet[ ( (c2 &0x0f) << 2 ) ];
+ g_assert (outptr [2] != 0);
+ outptr += 3;
+ break;
+ case 1:
+ outptr [0] = base64_alphabet [ c1 >> 2 ];
+ outptr [1] = base64_alphabet [ ( (c1&0x3) << 4 ) ];
+ outptr += 2;
+ break;
+ }
+
+ *save = 0;
+ *state = 0;
+
+ return outptr - out;
+}
+
+gchar *
+egg_base64_encode (const guchar *data,
+ gsize len)
+{
+ gchar *out;
+ gint state = 0, outlen;
+ gint save = 0;
+
+ g_return_val_if_fail (data != NULL || len == 0, NULL);
+
+ /* We can use a smaller limit here, since we know the saved state is 0,
+ +1 is needed for trailing \0, also check for unlikely integer overflow */
+ if (len >= ((G_MAXSIZE - 1) / 4 - 1) * 3)
+ g_error("%s: input too large for Base64 encoding (%"G_GSIZE_FORMAT" chars)",
+ G_STRLOC, len);
+
+ out = g_malloc ((len / 3 + 1) * 4 + 1);
+
+ outlen = egg_base64_encode_step (data, len, out, &state, &save);
+ outlen += egg_base64_encode_close (out + outlen, &state, &save);
+ out[outlen] = '\0';
+
+ return (gchar *) out;
+}
+
+static const unsigned char mime_base64_rank[256] = {
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255, 62,255,255,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255,255,255,255,
+ 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255, 63,
+ 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+ 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
+};
+
+static gsize
+egg_base64_decode_step (const gchar *in,
+ gsize len,
+ guchar *out)
+{
+ const guchar *inptr;
+ guchar *outptr;
+ const guchar *inend;
+ guchar c, rank;
+ guchar last[2];
+ unsigned int v;
+ int i;
+
+ g_return_val_if_fail (in != NULL, 0);
+ g_return_val_if_fail (out != NULL, 0);
+
+ if (len <= 0)
+ return 0;
+
+ inend = (const guchar *)in+len;
+ outptr = out;
+
+ /* convert 4 base64 bytes to 3 normal bytes */
+ v=0;
+ i=0;
+
+ last[0] = last[1] = 0;
+
+ inptr = (const guchar *)in;
+ while (inptr < inend)
+ {
+ c = *inptr++;
+ rank = mime_base64_rank [c];
+ if (rank != 0xff)
+ {
+ last[1] = last[0];
+ last[0] = c;
+ v = (v<<6) | rank;
+ i++;
+ if (i==4)
+ {
+ *outptr++ = v>>16;
+ *outptr++ = v>>8;
+ *outptr++ = v;
+ i=0;
+ }
+ }
+ }
+
+ if (i > 0)
+ {
+ v <<= 6*(4-i);
+ *outptr++ = v>>16;
+ if (i == 3)
+ *outptr++ = v>>8;
+ }
+
+ return outptr - out;
+}
+
+guchar *
+egg_base64_decode_inplace (gchar *text,
+ gsize *out_len)
+{
+ gint input_length;
+
+ g_return_val_if_fail (text != NULL, NULL);
+ g_return_val_if_fail (out_len != NULL, NULL);
+
+ input_length = strlen (text);
+
+ *out_len = egg_base64_decode_step (text, input_length, (guchar *) text);
+
+ return (guchar *) text;
+}
diff --git a/egg/egg-base64.h b/egg/egg-base64.h
new file mode 100644
index 0000000..0267f5b
--- /dev/null
+++ b/egg/egg-base64.h
@@ -0,0 +1,34 @@
+/* egg-base64.h - Base64 coding functions
+ *
+ * Copyright (C) 2005 Alexander Larsson <alexl redhat com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __EGG_BASE64_H__
+#define __EGG_BASE64_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+gchar* egg_base64_encode (const guchar *data,
+ gsize len) G_GNUC_MALLOC;
+guchar *egg_base64_decode_inplace (gchar *text,
+ gsize *out_len);
+
+
+G_END_DECLS
+
+#endif /* __EGG_BASE64_H__ */
diff --git a/egg/test-base64.c b/egg/test-base64.c
new file mode 100644
index 0000000..c9a7e58
--- /dev/null
+++ b/egg/test-base64.c
@@ -0,0 +1,71 @@
+/* test-base64.c: Test egg-base64.c
+
+ Copyright (C) 2018 Red Hat, Inc.
+
+ The Gnome Keyring Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The Gnome Keyring Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the Gnome Library; see the file COPYING.LIB. If not,
+ see <http://www.gnu.org/licenses/>.
+
+ Author: Daiki Ueno
+*/
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "egg/egg-base64.h"
+#include "egg/egg-testing.h"
+
+static void
+test_base64 (void)
+{
+ struct {
+ const guchar *input;
+ gsize length;
+ const gchar *output;
+ } tests[] = {
+ { (const guchar *) "", 0, "" },
+ { (const guchar *) "f", 1, "Zg" },
+ { (const guchar *) "fo", 2, "Zm8" },
+ { (const guchar *) "foo", 3, "Zm9v" },
+ { (const guchar *) "foob", 4, "Zm9vYg" },
+ { (const guchar *) "fooba", 5, "Zm9vYmE" },
+ { (const guchar *) "\xff\xee\xdd\xcc\xbb\xaa", 6, "_-7dzLuq" }
+ };
+ gsize i;
+
+ for (i = 0; i < G_N_ELEMENTS (tests); i++) {
+ gchar *output;
+ guchar *input;
+ gsize length;
+
+ output = egg_base64_encode (tests[i].input, tests[i].length);
+ g_assert_cmpstr (output, ==, tests[i].output);
+
+ input = egg_base64_decode_inplace (output, &length);
+ g_assert_cmpmem (input, length, tests[i].input, tests[i].length);
+ g_free (output);
+ }
+}
+
+int
+main (int argc, char **argv)
+{
+ g_test_init (&argc, &argv, NULL);
+
+ g_test_add_func ("/base64/test-base64", test_base64);
+
+ return g_test_run ();
+}
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