mirror of
git://source.winehq.org/git/wine.git
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579 lines
16 KiB
C
579 lines
16 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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* Copyright 2006 Juan Lang
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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 <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "wincrypt.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(crypt);
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#define CERT_HEADER "-----BEGIN CERTIFICATE-----"
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#define CERT_TRAILER "-----END CERTIFICATE-----"
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#define CERT_REQUEST_HEADER "-----BEGIN NEW CERTIFICATE REQUEST-----"
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#define CERT_REQUEST_TRAILER "-----END NEW CERTIFICATE REQUEST-----"
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#define X509_HEADER "-----BEGIN X509 CRL-----"
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#define X509_TRAILER "-----END X509 CRL-----"
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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typedef BOOL (*BinaryToStringAFunc)(const BYTE *pbBinary,
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DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString);
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static BOOL EncodeBinaryToBinaryA(const BYTE *pbBinary,
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DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
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{
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BOOL ret = TRUE;
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if (*pcchString < cbBinary)
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{
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if (!pszString)
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*pcchString = cbBinary;
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else
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{
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SetLastError(ERROR_INSUFFICIENT_BUFFER);
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*pcchString = cbBinary;
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ret = FALSE;
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}
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}
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else
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{
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if (cbBinary)
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memcpy(pszString, pbBinary, cbBinary);
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*pcchString = cbBinary;
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}
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return ret;
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}
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static LONG encodeBase64A(const BYTE *in_buf, int in_len, LPCSTR sep,
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char* out_buf, DWORD *out_len)
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{
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int div, i;
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const BYTE *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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DWORD needed;
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LPSTR ptr;
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TRACE("bytes is %d, pad bytes is %d\n", bytes, pad_bytes);
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needed = bytes + pad_bytes + 1;
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needed += (needed / 64 + 1) * strlen(sep);
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if (needed > *out_len)
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{
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*out_len = needed;
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return ERROR_INSUFFICIENT_BUFFER;
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}
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else
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*out_len = needed;
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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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ptr = out_buf;
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i = 0;
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while (div > 0)
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{
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if (i && i % 64 == 0)
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{
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strcpy(ptr, sep);
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ptr += strlen(sep);
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}
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/* first char is the first 6 bits of the first byte*/
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*ptr++ = 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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*ptr++ = 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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*ptr++ = 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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*ptr++ = 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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*ptr++ = 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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*ptr++ = 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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*ptr++ = b64[ ((d[1] << 2) & 0x3c) ];
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/* fourth char is a = to indicate one byte of padding */
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*ptr++ = '=';
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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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*ptr++ = 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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*ptr++ = b64[ ((d[0] << 4) & 0x30)];
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/* third char is = to indicate padding */
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*ptr++ = '=';
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/* fourth char is = to indicate padding */
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*ptr++ = '=';
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break;
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}
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strcpy(ptr, sep);
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return ERROR_SUCCESS;
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}
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static BOOL BinaryToBase64A(const BYTE *pbBinary,
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DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
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{
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static const char crlf[] = "\r\n", lf[] = "\n";
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BOOL ret = TRUE;
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LPCSTR header = NULL, trailer = NULL, sep = NULL;
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DWORD charsNeeded;
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if (dwFlags & CRYPT_STRING_NOCR)
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sep = lf;
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else
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sep = crlf;
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switch (dwFlags & 0x7fffffff)
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{
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case CRYPT_STRING_BASE64:
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/* no header or footer */
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break;
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case CRYPT_STRING_BASE64HEADER:
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header = CERT_HEADER;
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trailer = CERT_TRAILER;
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break;
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case CRYPT_STRING_BASE64REQUESTHEADER:
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header = CERT_REQUEST_HEADER;
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trailer = CERT_REQUEST_TRAILER;
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break;
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case CRYPT_STRING_BASE64X509CRLHEADER:
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header = X509_HEADER;
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trailer = X509_TRAILER;
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break;
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}
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charsNeeded = 0;
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encodeBase64A(pbBinary, cbBinary, sep, NULL, &charsNeeded);
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charsNeeded += strlen(sep);
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if (header)
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charsNeeded += strlen(header) + strlen(sep);
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if (trailer)
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charsNeeded += strlen(trailer) + strlen(sep);
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if (charsNeeded <= *pcchString)
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{
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LPSTR ptr = pszString;
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DWORD size = charsNeeded;
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if (header)
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{
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strcpy(ptr, header);
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ptr += strlen(ptr);
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strcpy(ptr, sep);
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ptr += strlen(sep);
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}
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encodeBase64A(pbBinary, cbBinary, sep, ptr, &size);
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ptr += size - 1;
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if (trailer)
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{
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strcpy(ptr, trailer);
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ptr += strlen(ptr);
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strcpy(ptr, sep);
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ptr += strlen(sep);
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}
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*pcchString = charsNeeded - 1;
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}
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else if (pszString)
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{
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*pcchString = charsNeeded;
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SetLastError(ERROR_INSUFFICIENT_BUFFER);
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ret = FALSE;
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}
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else
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*pcchString = charsNeeded;
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return ret;
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}
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BOOL WINAPI CryptBinaryToStringA(const BYTE *pbBinary,
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DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
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{
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BinaryToStringAFunc encoder = NULL;
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TRACE("(%p, %d, %08x, %p, %p)\n", pbBinary, cbBinary, dwFlags, pszString,
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pcchString);
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if (!pbBinary)
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{
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SetLastError(ERROR_INVALID_PARAMETER);
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return FALSE;
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}
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if (!pcchString)
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{
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SetLastError(ERROR_INVALID_PARAMETER);
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return FALSE;
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}
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switch (dwFlags & 0x7fffffff)
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{
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case CRYPT_STRING_BINARY:
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encoder = EncodeBinaryToBinaryA;
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break;
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case CRYPT_STRING_BASE64:
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case CRYPT_STRING_BASE64HEADER:
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case CRYPT_STRING_BASE64REQUESTHEADER:
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case CRYPT_STRING_BASE64X509CRLHEADER:
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encoder = BinaryToBase64A;
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break;
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case CRYPT_STRING_HEX:
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case CRYPT_STRING_HEXASCII:
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case CRYPT_STRING_HEXADDR:
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case CRYPT_STRING_HEXASCIIADDR:
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FIXME("Unimplemented type %d\n", dwFlags & 0x7fffffff);
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/* fall through */
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default:
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SetLastError(ERROR_INVALID_PARAMETER);
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return FALSE;
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}
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return encoder(pbBinary, cbBinary, dwFlags, pszString, pcchString);
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}
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static inline BYTE decodeBase64Byte(char c)
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{
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BYTE ret;
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if (c >= 'A' && c <= 'Z')
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ret = c - 'A';
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else if (c >= 'a' && c <= 'z')
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ret = c - 'a' + 26;
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else if (c >= '0' && c <= '9')
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ret = c - '0' + 52;
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else if (c == '+')
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ret = 62;
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else if (c == '/')
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ret = 63;
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else
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ret = 64;
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return ret;
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}
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static LONG decodeBase64Block(const char *in_buf, int in_len,
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const char **nextBlock, PBYTE out_buf, DWORD *out_len)
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{
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int len = in_len, i;
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const char *d = in_buf;
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int ip0, ip1, ip2, ip3;
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if (len < 4)
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return ERROR_INVALID_DATA;
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i = 0;
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if (d[2] == '=')
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{
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if ((ip0 = decodeBase64Byte(d[0])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip1 = decodeBase64Byte(d[1])) > 63)
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return ERROR_INVALID_DATA;
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if (out_buf)
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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 = decodeBase64Byte(d[0])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip1 = decodeBase64Byte(d[1])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip2 = decodeBase64Byte(d[2])) > 63)
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return ERROR_INVALID_DATA;
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if (out_buf)
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{
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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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}
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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 = decodeBase64Byte(d[0])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip1 = decodeBase64Byte(d[1])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip2 = decodeBase64Byte(d[2])) > 63)
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return ERROR_INVALID_DATA;
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if ((ip3 = decodeBase64Byte(d[3])) > 63)
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return ERROR_INVALID_DATA;
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if (out_buf)
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{
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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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}
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i += 3;
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}
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if (len >= 6 && d[4] == '\r' && d[5] == '\n')
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*nextBlock = d + 6;
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else if (len >= 5 && d[4] == '\n')
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*nextBlock = d + 5;
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else if (len >= 4 && d[4])
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*nextBlock = d + 4;
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else
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*nextBlock = NULL;
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*out_len = i;
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return ERROR_SUCCESS;
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}
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/* Unlike CryptStringToBinaryA, cchString is guaranteed to be the length of the
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* string to convert.
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*/
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typedef LONG (*StringToBinaryAFunc)(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags);
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static LONG Base64ToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret = ERROR_SUCCESS;
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const char *nextBlock;
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DWORD outLen = 0;
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nextBlock = pszString;
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while (nextBlock && !ret)
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{
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DWORD len = 0;
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ret = decodeBase64Block(nextBlock, cchString - (nextBlock - pszString),
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&nextBlock, pbBinary ? pbBinary + outLen : NULL, &len);
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if (!ret)
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outLen += len;
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if (cchString - (nextBlock - pszString) <= 0)
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nextBlock = NULL;
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}
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*pcbBinary = outLen;
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if (!ret)
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{
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if (pdwSkip)
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*pdwSkip = 0;
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if (pdwFlags)
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*pdwFlags = CRYPT_STRING_BASE64;
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}
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else if (ret == ERROR_INSUFFICIENT_BUFFER)
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{
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if (!pbBinary)
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ret = ERROR_SUCCESS;
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}
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return ret;
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}
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static LONG Base64WithHeaderAndTrailerToBinaryA(LPCSTR pszString,
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DWORD cchString, LPCSTR header, LPCSTR trailer, BYTE *pbBinary,
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DWORD *pcbBinary, DWORD *pdwSkip)
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{
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LONG ret;
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LPCSTR ptr;
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if (cchString > strlen(header) + strlen(trailer)
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&& (ptr = strstr(pszString, header)) != NULL)
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{
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LPCSTR trailerSpot = pszString + cchString - strlen(trailer);
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if (pszString[cchString - 1] == '\n')
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{
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cchString--;
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trailerSpot--;
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}
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if (pszString[cchString - 1] == '\r')
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{
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cchString--;
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trailerSpot--;
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}
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if (!strncmp(trailerSpot, trailer, strlen(trailer)))
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{
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if (pdwSkip)
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*pdwSkip = ptr - pszString;
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ptr += strlen(header);
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if (*ptr == '\r') ptr++;
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if (*ptr == '\n') ptr++;
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cchString -= ptr - pszString + strlen(trailer);
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ret = Base64ToBinaryA(ptr, cchString, pbBinary, pcbBinary, NULL,
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NULL);
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}
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else
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ret = ERROR_INVALID_DATA;
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}
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else
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ret = ERROR_INVALID_DATA;
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return ret;
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}
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static LONG Base64HeaderToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
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CERT_HEADER, CERT_TRAILER, pbBinary, pcbBinary, pdwSkip);
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if (!ret && pdwFlags)
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*pdwFlags = CRYPT_STRING_BASE64HEADER;
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return ret;
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}
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static LONG Base64RequestHeaderToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
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CERT_REQUEST_HEADER, CERT_REQUEST_TRAILER, pbBinary, pcbBinary, pdwSkip);
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if (!ret && pdwFlags)
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*pdwFlags = CRYPT_STRING_BASE64REQUESTHEADER;
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return ret;
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}
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static LONG Base64X509HeaderToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
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X509_HEADER, X509_TRAILER, pbBinary, pcbBinary, pdwSkip);
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if (!ret && pdwFlags)
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*pdwFlags = CRYPT_STRING_BASE64X509CRLHEADER;
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return ret;
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}
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static LONG Base64AnyToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret;
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ret = Base64HeaderToBinaryA(pszString, cchString, pbBinary, pcbBinary,
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pdwSkip, pdwFlags);
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if (ret == ERROR_INVALID_DATA)
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ret = Base64ToBinaryA(pszString, cchString, pbBinary, pcbBinary,
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pdwSkip, pdwFlags);
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return ret;
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}
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static LONG DecodeBinaryToBinaryA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret = ERROR_SUCCESS;
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if (*pcbBinary < cchString)
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{
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if (!pbBinary)
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*pcbBinary = cchString;
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else
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{
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ret = ERROR_INSUFFICIENT_BUFFER;
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*pcbBinary = cchString;
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}
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}
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else
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{
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if (cchString)
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memcpy(pbBinary, pszString, cchString);
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*pcbBinary = cchString;
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}
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return ret;
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}
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static LONG DecodeAnyA(LPCSTR pszString, DWORD cchString,
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BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
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{
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LONG ret;
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ret = Base64HeaderToBinaryA(pszString, cchString, pbBinary, pcbBinary,
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pdwSkip, pdwFlags);
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if (ret == ERROR_INVALID_DATA)
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ret = Base64ToBinaryA(pszString, cchString, pbBinary, pcbBinary,
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pdwSkip, pdwFlags);
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if (ret == ERROR_INVALID_DATA)
|
|
ret = DecodeBinaryToBinaryA(pszString, cchString, pbBinary, pcbBinary,
|
|
pdwSkip, pdwFlags);
|
|
return ret;
|
|
}
|
|
|
|
BOOL WINAPI CryptStringToBinaryA(LPCSTR pszString,
|
|
DWORD cchString, DWORD dwFlags, BYTE *pbBinary, DWORD *pcbBinary,
|
|
DWORD *pdwSkip, DWORD *pdwFlags)
|
|
{
|
|
StringToBinaryAFunc decoder;
|
|
LONG ret;
|
|
|
|
TRACE("(%s, %d, %08x, %p, %p, %p, %p)\n", debugstr_a(pszString),
|
|
cchString, dwFlags, pbBinary, pcbBinary, pdwSkip, pdwFlags);
|
|
|
|
if (!pszString)
|
|
{
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return FALSE;
|
|
}
|
|
/* Only the bottom byte contains valid types */
|
|
if (dwFlags & 0xfffffff0)
|
|
{
|
|
SetLastError(ERROR_INVALID_DATA);
|
|
return FALSE;
|
|
}
|
|
switch (dwFlags)
|
|
{
|
|
case CRYPT_STRING_BASE64_ANY:
|
|
decoder = Base64AnyToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_BASE64:
|
|
decoder = Base64ToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_BASE64HEADER:
|
|
decoder = Base64HeaderToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_BASE64REQUESTHEADER:
|
|
decoder = Base64RequestHeaderToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_BASE64X509CRLHEADER:
|
|
decoder = Base64X509HeaderToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_BINARY:
|
|
decoder = DecodeBinaryToBinaryA;
|
|
break;
|
|
case CRYPT_STRING_ANY:
|
|
decoder = DecodeAnyA;
|
|
break;
|
|
case CRYPT_STRING_HEX:
|
|
case CRYPT_STRING_HEXASCII:
|
|
case CRYPT_STRING_HEXADDR:
|
|
case CRYPT_STRING_HEXASCIIADDR:
|
|
FIXME("Unimplemented type %d\n", dwFlags & 0x7fffffff);
|
|
/* fall through */
|
|
default:
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return FALSE;
|
|
}
|
|
if (!cchString)
|
|
cchString = strlen(pszString);
|
|
ret = decoder(pszString, cchString, pbBinary, pcbBinary, pdwSkip, pdwFlags);
|
|
if (ret)
|
|
SetLastError(ret);
|
|
return (ret == ERROR_SUCCESS) ? TRUE : FALSE;
|
|
}
|