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191 lines
5.7 KiB
C
191 lines
5.7 KiB
C
/*
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* base64 encoder/decoder
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*
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* Copyright 2005 by Kai Blin
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "precomp.h"
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#include <wine/debug.h>
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WINE_DEFAULT_DEBUG_CHANNEL(ntlm);
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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SECURITY_STATUS encodeBase64(PBYTE in_buf, int in_len, char* out_buf,
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int max_len, int *out_len)
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{
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int div, i;
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PBYTE d = in_buf;
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int bytes = (in_len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
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TRACE("bytes is %d, pad bytes is %d\n", bytes, pad_bytes);
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*out_len = bytes + pad_bytes;
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if(bytes + pad_bytes + 1 > max_len)
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return SEC_E_BUFFER_TOO_SMALL;
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/* Three bytes of input give 4 chars of output */
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div = in_len / 3;
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i = 0;
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while(div > 0)
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{
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/* first char is the first 6 bits of the first byte*/
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out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
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/* second char is the last 2 bits of the first byte and the first 4
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* bits of the second byte */
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out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
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/* third char is the last 4 bits of the second byte and the first 2
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* bits of the third byte */
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out_buf[i + 2] = b64[ ((d[1] << 2) & 0x3c) | (d[2] >> 6 & 0x03)];
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/* fourth char is the remaining 6 bits of the third byte */
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out_buf[i + 3] = b64[ d[2] & 0x3f];
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i += 4;
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d += 3;
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div--;
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}
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switch(pad_bytes)
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{
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case 1:
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/* first char is the first 6 bits of the first byte*/
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out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
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/* second char is the last 2 bits of the first byte and the first 4
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* bits of the second byte */
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out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
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/* third char is the last 4 bits of the second byte padded with
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* two zeroes */
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out_buf[i + 2] = b64[ ((d[1] << 2) & 0x3c) ];
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/* fourth char is a = to indicate one byte of padding */
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out_buf[i + 3] = '=';
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out_buf[i + 4] = 0;
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break;
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case 2:
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/* first char is the first 6 bits of the first byte*/
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out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
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/* second char is the last 2 bits of the first byte padded with
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* four zeroes*/
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out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30)];
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/* third char is = to indicate padding */
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out_buf[i + 2] = '=';
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/* fourth char is = to indicate padding */
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out_buf[i + 3] = '=';
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out_buf[i + 4] = 0;
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break;
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default:
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out_buf[i] = 0;
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}
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return SEC_E_OK;
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}
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static inline BYTE decode(char c)
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{
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if( c >= 'A' && c <= 'Z')
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return c - 'A';
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if( c >= 'a' && c <= 'z')
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return c - 'a' + 26;
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if( c >= '0' && c <= '9')
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return c - '0' + 52;
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if( c == '+')
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return 62;
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if( c == '/')
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return 63;
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else
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return 64;
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}
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SECURITY_STATUS decodeBase64(char *in_buf, int in_len, PBYTE out_buf,
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int max_len, int *out_len)
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{
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int len = in_len, i;
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char *d = in_buf;
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int ip0, ip1, ip2, ip3;
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TRACE("in_len: %d\n", in_len);
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if((in_len % 4) != 0)
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return SEC_E_INVALID_TOKEN;
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if(in_len > max_len)
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return SEC_E_BUFFER_TOO_SMALL;
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i = 0;
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while(len > 4)
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{
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if((ip0 = decode(d[0])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip1 = decode(d[1])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip2 = decode(d[2])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip3 = decode(d[3])) > 63)
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return SEC_E_INVALID_TOKEN;
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out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
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out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
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out_buf[i + 2] = (ip2 << 6) | ip3;
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len -= 4;
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i += 3;
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d += 4;
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}
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if(d[2] == '=')
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{
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if((ip0 = decode(d[0])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip1 = decode(d[1])) > 63)
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return SEC_E_INVALID_TOKEN;
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out_buf[i] = (ip0 << 2) | (ip1 >> 4);
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i++;
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}
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else if(d[3] == '=')
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{
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if((ip0 = decode(d[0])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip1 = decode(d[1])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip2 = decode(d[2])) > 63)
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return SEC_E_INVALID_TOKEN;
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out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
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out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
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i += 2;
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}
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else
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{
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if((ip0 = decode(d[0])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip1 = decode(d[1])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip2 = decode(d[2])) > 63)
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return SEC_E_INVALID_TOKEN;
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if((ip3 = decode(d[3])) > 63)
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return SEC_E_INVALID_TOKEN;
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out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
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out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
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out_buf[i + 2] = (ip2 << 6) | ip3;
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i += 3;
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}
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*out_len = i;
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return SEC_E_OK;
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}
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