secur32: base64 codec, with lookup table
Kai Blin
blin at gmx.net
Tue Aug 30 08:24:47 CDT 2005
As the old version had potential licensing issues, I've rewritten the
codec from scratch, and in this version, used a lookup function for the
decoder.
Changelog:
Kai Blin <blin at gmx.net>
Added a base64 codec for communication with ntlm_auth.
--
Kai Blin, (blin at gmx dot net)
Some optional equipment shown.
-------------- next part --------------
Index: dlls/secur32/Makefile.in
===================================================================
RCS file: /home/wine/wine/dlls/secur32/Makefile.in,v
retrieving revision 1.6
diff -u -3 -r1.6 Makefile.in
--- dlls/secur32/Makefile.in 17 Aug 2005 09:52:30 -0000 1.6
+++ dlls/secur32/Makefile.in 30 Aug 2005 13:18:24 -0000
@@ -7,6 +7,7 @@
IMPORTS = user32 advapi32 kernel32 ntdll
C_SRCS = \
+ base64_codec.c \
negotiate.c \
ntlm.c \
schannel.c \
Index: dlls/secur32/secur32_priv.h
===================================================================
RCS file: /home/wine/wine/dlls/secur32/secur32_priv.h,v
retrieving revision 1.5
diff -u -3 -r1.5 secur32_priv.h
--- dlls/secur32/secur32_priv.h 30 Aug 2005 08:55:20 -0000 1.5
+++ dlls/secur32/secur32_priv.h 30 Aug 2005 13:18:24 -0000
@@ -86,4 +86,11 @@
void SECUR32_initNegotiateSP(void);
void SECUR32_initNTLMSP(void);
+/* Functions from base64_codec.c used elsewhere */
+SECURITY_STATUS encodeBase64(PBYTE in_buf, int in_len, char* out_buf,
+ int max_len, int *out_len);
+
+SECURITY_STATUS decodeBase64(char *in_buf, int in_len, BYTE *out_buf,
+ int max_len, int *out_len);
+
#endif /* ndef __SECUR32_PRIV_H__ */
--- /dev/null 2005-08-30 09:02:02.639199272 +0200
+++ dlls/secur32/base64_codec.c 2005-08-30 15:15:35.001090304 +0200
@@ -0,0 +1,179 @@
+/*
+ * base64 encoder/decoder
+ *
+ * Copyright 2005 by Kai Blin
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "windef.h"
+#include "winerror.h"
+#include "sspi.h"
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(secur32);
+
+static const char b64[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+SECURITY_STATUS encodeBase64(PBYTE in_buf, int in_len, char* out_buf,
+ int max_len, int *out_len)
+{
+ int div, i;
+ PBYTE d = in_buf;
+ int bytes = (in_len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
+
+ TRACE("bytes is %d, pad bytes is %d\n", bytes, pad_bytes);
+ *out_len = bytes + pad_bytes;
+
+ if(bytes + pad_bytes + 1 > max_len)
+ return SEC_E_BUFFER_TOO_SMALL;
+
+ /* Three bytes of input give 4 chars of output */
+ div = in_len / 3;
+
+ i = 0;
+ while(div > 0)
+ {
+ /* first char is the first 6 bits of the first byte*/
+ out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
+ /* second char is the last 2 bits of the first byte and the first 4
+ * bits of the second byte */
+ out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
+ /* third char is the last 4 bits of the second byte and the first 2
+ * bits of the third byte */
+ out_buf[i + 2] = b64[ ((d[1] << 2) & 0x3c) | (d[2] >> 6 & 0x03)];
+ /* fourth char is the remaining 6 bits of the third byte */
+ out_buf[i + 3] = b64[ d[2] & 0x3f];
+ i += 4;
+ d += 3;
+ div--;
+ }
+
+ switch(pad_bytes)
+ {
+ case 1:
+ /* first char is the first 6 bits of the first byte*/
+ out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
+ /* second char is the last 2 bits of the first byte and the first 4
+ * bits of the second byte */
+ out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
+ /* third char is the last 4 bits of the second byte padded with
+ * two zeroes */
+ out_buf[i + 2] = b64[ ((d[1] >> 4) & 0x3c) ];
+ /* fourth char is a = to indicate one byte of padding */
+ out_buf[i + 3] = '=';
+ out_buf[i + 4] = 0;
+ break;
+ case 2:
+ /* first char is the first 6 bits of the first byte*/
+ out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
+ /* second char is the last 2 bits of the first byte padded with
+ * four zeroes*/
+ out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30)];
+ /* third char is = to indicate padding */
+ out_buf[i + 2] = '=';
+ /* fourth char is = to indicate padding */
+ out_buf[i + 3] = '=';
+ out_buf[i + 4] = 0;
+ break;
+ default:
+ out_buf[i] = 0;
+ }
+
+ return SEC_E_OK;
+}
+
+BYTE decode(char c)
+{
+ if( c >= 'A' && c <= 'Z')
+ return c - 'A';
+ if( c >= 'a' && c <= 'z')
+ return c - 'a' + 26;
+ if( c >= '0' && c <= '9')
+ return c - '0' + 52;
+ if( c == '+')
+ return 62;
+ if( c == '/')
+ return 63;
+ else
+ return 64;
+}
+
+SECURITY_STATUS decodeBase64(char *in_buf, int in_len, PBYTE out_buf,
+ int max_len, int *out_len)
+{
+ int len = in_len, i;
+ char *d = in_buf;
+ int ip0, ip1, ip2, ip3;
+
+ TRACE("in_len: %d\n", in_len);
+
+ if((in_len % 4) != 0)
+ return SEC_E_INVALID_TOKEN;
+
+ if(in_len > max_len)
+ return SEC_E_BUFFER_TOO_SMALL;
+
+ i = 0;
+ while(len > 4)
+ {
+ ip0 = decode(d[0]);
+ ip1 = decode(d[1]);
+ ip2 = decode(d[2]);
+ ip3 = decode(d[3]);
+
+ out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
+ out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
+ out_buf[i + 2] = (ip2 << 6) | ip3;
+ len -= 4;
+ i += 3;
+ d += 4;
+ }
+
+ if(d[2] == '=')
+ {
+ ip0 = decode(d[0]);
+ ip1 = decode(d[1]);
+
+ out_buf[i] = (ip0 << 2) | (ip1 >> 4);
+ i++;
+ }
+ else if(d[3] == '=')
+ {
+ ip0 = decode(d[0]);
+ ip1 = decode(d[1]);
+ ip2 = decode(d[2]);
+
+ out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
+ out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
+ i += 2;
+ }
+ else
+ {
+ ip0 = decode(d[0]);
+ ip1 = decode(d[1]);
+ ip2 = decode(d[2]);
+ ip3 = decode(d[3]);
+
+ out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
+ out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
+ out_buf[i + 2] = (ip2 << 6) | ip3;
+ i += 3;
+ }
+ *out_len = i;
+ return SEC_E_OK;
+}
+
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