2 * base64 encoder/decoder
4 * Copyright 2005 by Kai Blin
5 * Copyright 2006 Juan Lang
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
27 #include "wine/debug.h"
29 WINE_DEFAULT_DEBUG_CHANNEL(crypt);
31 #define CERT_HEADER "-----BEGIN CERTIFICATE-----"
32 #define CERT_TRAILER "-----END CERTIFICATE-----"
33 #define CERT_REQUEST_HEADER "-----BEGIN NEW CERTIFICATE REQUEST-----"
34 #define CERT_REQUEST_TRAILER "-----END NEW CERTIFICATE REQUEST-----"
35 #define X509_HEADER "-----BEGIN X509 CRL-----"
36 #define X509_TRAILER "-----END X509 CRL-----"
38 static const char b64[] =
39 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
41 typedef BOOL (*BinaryToStringAFunc)(const BYTE *pbBinary,
42 DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString);
44 static BOOL EncodeBinaryToBinaryA(const BYTE *pbBinary,
45 DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
49 if (*pcchString < cbBinary)
52 *pcchString = cbBinary;
55 SetLastError(ERROR_INSUFFICIENT_BUFFER);
56 *pcchString = cbBinary;
63 memcpy(pszString, pbBinary, cbBinary);
64 *pcchString = cbBinary;
69 static LONG encodeBase64A(const BYTE *in_buf, int in_len, LPCSTR sep,
70 char* out_buf, DWORD *out_len)
73 const BYTE *d = in_buf;
74 int bytes = (in_len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
78 TRACE("bytes is %d, pad bytes is %d\n", bytes, pad_bytes);
79 needed = bytes + pad_bytes + 1;
80 needed += (needed / 64 + 1) * strlen(sep);
82 if (needed > *out_len)
85 return ERROR_INSUFFICIENT_BUFFER;
90 /* Three bytes of input give 4 chars of output */
102 /* first char is the first 6 bits of the first byte*/
103 *ptr++ = b64[ ( d[0] >> 2) & 0x3f ];
104 /* second char is the last 2 bits of the first byte and the first 4
105 * bits of the second byte */
106 *ptr++ = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
107 /* third char is the last 4 bits of the second byte and the first 2
108 * bits of the third byte */
109 *ptr++ = b64[ ((d[1] << 2) & 0x3c) | (d[2] >> 6 & 0x03)];
110 /* fourth char is the remaining 6 bits of the third byte */
111 *ptr++ = b64[ d[2] & 0x3f];
120 /* first char is the first 6 bits of the first byte*/
121 *ptr++ = b64[ ( d[0] >> 2) & 0x3f ];
122 /* second char is the last 2 bits of the first byte and the first 4
123 * bits of the second byte */
124 *ptr++ = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
125 /* third char is the last 4 bits of the second byte padded with
127 *ptr++ = b64[ ((d[1] << 2) & 0x3c) ];
128 /* fourth char is a = to indicate one byte of padding */
132 /* first char is the first 6 bits of the first byte*/
133 *ptr++ = b64[ ( d[0] >> 2) & 0x3f ];
134 /* second char is the last 2 bits of the first byte padded with
136 *ptr++ = b64[ ((d[0] << 4) & 0x30)];
137 /* third char is = to indicate padding */
139 /* fourth char is = to indicate padding */
145 return ERROR_SUCCESS;
148 static BOOL BinaryToBase64A(const BYTE *pbBinary,
149 DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
151 static const char crlf[] = "\r\n", lf[] = "\n";
153 LPCSTR header = NULL, trailer = NULL, sep = NULL;
156 if (dwFlags & CRYPT_STRING_NOCR)
160 switch (dwFlags & 0x7fffffff)
162 case CRYPT_STRING_BASE64:
163 /* no header or footer */
165 case CRYPT_STRING_BASE64HEADER:
166 header = CERT_HEADER;
167 trailer = CERT_TRAILER;
169 case CRYPT_STRING_BASE64REQUESTHEADER:
170 header = CERT_REQUEST_HEADER;
171 trailer = CERT_REQUEST_TRAILER;
173 case CRYPT_STRING_BASE64X509CRLHEADER:
174 header = X509_HEADER;
175 trailer = X509_TRAILER;
180 encodeBase64A(pbBinary, cbBinary, sep, NULL, &charsNeeded);
181 charsNeeded += strlen(sep);
183 charsNeeded += strlen(header) + strlen(sep);
185 charsNeeded += strlen(trailer) + strlen(sep);
186 if (charsNeeded <= *pcchString)
188 LPSTR ptr = pszString;
189 DWORD size = charsNeeded;
198 encodeBase64A(pbBinary, cbBinary, sep, ptr, &size);
202 strcpy(ptr, trailer);
207 *pcchString = charsNeeded - 1;
211 *pcchString = charsNeeded;
212 SetLastError(ERROR_INSUFFICIENT_BUFFER);
216 *pcchString = charsNeeded;
220 BOOL WINAPI CryptBinaryToStringA(const BYTE *pbBinary,
221 DWORD cbBinary, DWORD dwFlags, LPSTR pszString, DWORD *pcchString)
223 BinaryToStringAFunc encoder = NULL;
225 TRACE("(%p, %d, %08x, %p, %p)\n", pbBinary, cbBinary, dwFlags, pszString,
230 SetLastError(ERROR_INVALID_PARAMETER);
235 SetLastError(ERROR_INVALID_PARAMETER);
239 switch (dwFlags & 0x7fffffff)
241 case CRYPT_STRING_BINARY:
242 encoder = EncodeBinaryToBinaryA;
244 case CRYPT_STRING_BASE64:
245 case CRYPT_STRING_BASE64HEADER:
246 case CRYPT_STRING_BASE64REQUESTHEADER:
247 case CRYPT_STRING_BASE64X509CRLHEADER:
248 encoder = BinaryToBase64A;
250 case CRYPT_STRING_HEX:
251 case CRYPT_STRING_HEXASCII:
252 case CRYPT_STRING_HEXADDR:
253 case CRYPT_STRING_HEXASCIIADDR:
254 FIXME("Unimplemented type %d\n", dwFlags & 0x7fffffff);
257 SetLastError(ERROR_INVALID_PARAMETER);
260 return encoder(pbBinary, cbBinary, dwFlags, pszString, pcchString);
263 static inline BYTE decodeBase64Byte(char c)
267 if (c >= 'A' && c <= 'Z')
269 else if (c >= 'a' && c <= 'z')
271 else if (c >= '0' && c <= '9')
282 static LONG decodeBase64Block(const char *in_buf, int in_len,
283 const char **nextBlock, PBYTE out_buf, DWORD *out_len)
286 const char *d = in_buf;
287 int ip0, ip1, ip2, ip3;
290 return ERROR_INVALID_DATA;
295 if ((ip0 = decodeBase64Byte(d[0])) > 63)
296 return ERROR_INVALID_DATA;
297 if ((ip1 = decodeBase64Byte(d[1])) > 63)
298 return ERROR_INVALID_DATA;
301 out_buf[i] = (ip0 << 2) | (ip1 >> 4);
304 else if (d[3] == '=')
306 if ((ip0 = decodeBase64Byte(d[0])) > 63)
307 return ERROR_INVALID_DATA;
308 if ((ip1 = decodeBase64Byte(d[1])) > 63)
309 return ERROR_INVALID_DATA;
310 if ((ip2 = decodeBase64Byte(d[2])) > 63)
311 return ERROR_INVALID_DATA;
315 out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
316 out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
322 if ((ip0 = decodeBase64Byte(d[0])) > 63)
323 return ERROR_INVALID_DATA;
324 if ((ip1 = decodeBase64Byte(d[1])) > 63)
325 return ERROR_INVALID_DATA;
326 if ((ip2 = decodeBase64Byte(d[2])) > 63)
327 return ERROR_INVALID_DATA;
328 if ((ip3 = decodeBase64Byte(d[3])) > 63)
329 return ERROR_INVALID_DATA;
333 out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
334 out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
335 out_buf[i + 2] = (ip2 << 6) | ip3;
339 if (len >= 6 && d[4] == '\r' && d[5] == '\n')
341 else if (len >= 5 && d[4] == '\n')
343 else if (len >= 4 && d[4])
348 return ERROR_SUCCESS;
351 /* Unlike CryptStringToBinaryA, cchString is guaranteed to be the length of the
354 typedef LONG (*StringToBinaryAFunc)(LPCSTR pszString, DWORD cchString,
355 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags);
357 static LONG Base64ToBinaryA(LPCSTR pszString, DWORD cchString,
358 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
360 LONG ret = ERROR_SUCCESS;
361 const char *nextBlock;
364 nextBlock = pszString;
365 while (nextBlock && !ret)
369 ret = decodeBase64Block(nextBlock, cchString - (nextBlock - pszString),
370 &nextBlock, pbBinary ? pbBinary + outLen : NULL, &len);
373 if (cchString - (nextBlock - pszString) <= 0)
382 *pdwFlags = CRYPT_STRING_BASE64;
384 else if (ret == ERROR_INSUFFICIENT_BUFFER)
392 static LONG Base64WithHeaderAndTrailerToBinaryA(LPCSTR pszString,
393 DWORD cchString, LPCSTR header, LPCSTR trailer, BYTE *pbBinary,
394 DWORD *pcbBinary, DWORD *pdwSkip)
399 if (cchString > strlen(header) + strlen(trailer)
400 && (ptr = strstr(pszString, header)) != NULL)
402 LPCSTR trailerSpot = pszString + cchString - strlen(trailer);
404 if (pszString[cchString - 1] == '\n')
409 if (pszString[cchString - 1] == '\r')
414 if (!strncmp(trailerSpot, trailer, strlen(trailer)))
417 *pdwSkip = ptr - pszString;
418 ptr += strlen(header);
419 if (*ptr == '\r') ptr++;
420 if (*ptr == '\n') ptr++;
421 cchString -= ptr - pszString + strlen(trailer);
422 ret = Base64ToBinaryA(ptr, cchString, pbBinary, pcbBinary, NULL,
426 ret = ERROR_INVALID_DATA;
429 ret = ERROR_INVALID_DATA;
433 static LONG Base64HeaderToBinaryA(LPCSTR pszString, DWORD cchString,
434 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
436 LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
437 CERT_HEADER, CERT_TRAILER, pbBinary, pcbBinary, pdwSkip);
439 if (!ret && pdwFlags)
440 *pdwFlags = CRYPT_STRING_BASE64HEADER;
444 static LONG Base64RequestHeaderToBinaryA(LPCSTR pszString, DWORD cchString,
445 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
447 LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
448 CERT_REQUEST_HEADER, CERT_REQUEST_TRAILER, pbBinary, pcbBinary, pdwSkip);
450 if (!ret && pdwFlags)
451 *pdwFlags = CRYPT_STRING_BASE64REQUESTHEADER;
455 static LONG Base64X509HeaderToBinaryA(LPCSTR pszString, DWORD cchString,
456 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
458 LONG ret = Base64WithHeaderAndTrailerToBinaryA(pszString, cchString,
459 X509_HEADER, X509_TRAILER, pbBinary, pcbBinary, pdwSkip);
461 if (!ret && pdwFlags)
462 *pdwFlags = CRYPT_STRING_BASE64X509CRLHEADER;
466 static LONG Base64AnyToBinaryA(LPCSTR pszString, DWORD cchString,
467 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
471 ret = Base64HeaderToBinaryA(pszString, cchString, pbBinary, pcbBinary,
473 if (ret == ERROR_INVALID_DATA)
474 ret = Base64ToBinaryA(pszString, cchString, pbBinary, pcbBinary,
479 static LONG DecodeBinaryToBinaryA(LPCSTR pszString, DWORD cchString,
480 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
482 LONG ret = ERROR_SUCCESS;
484 if (*pcbBinary < cchString)
487 *pcbBinary = cchString;
490 ret = ERROR_INSUFFICIENT_BUFFER;
491 *pcbBinary = cchString;
497 memcpy(pbBinary, pszString, cchString);
498 *pcbBinary = cchString;
503 static LONG DecodeAnyA(LPCSTR pszString, DWORD cchString,
504 BYTE *pbBinary, DWORD *pcbBinary, DWORD *pdwSkip, DWORD *pdwFlags)
508 ret = Base64HeaderToBinaryA(pszString, cchString, pbBinary, pcbBinary,
510 if (ret == ERROR_INVALID_DATA)
511 ret = Base64ToBinaryA(pszString, cchString, pbBinary, pcbBinary,
513 if (ret == ERROR_INVALID_DATA)
514 ret = DecodeBinaryToBinaryA(pszString, cchString, pbBinary, pcbBinary,
519 BOOL WINAPI CryptStringToBinaryA(LPCSTR pszString,
520 DWORD cchString, DWORD dwFlags, BYTE *pbBinary, DWORD *pcbBinary,
521 DWORD *pdwSkip, DWORD *pdwFlags)
523 StringToBinaryAFunc decoder;
526 TRACE("(%s, %d, %08x, %p, %p, %p, %p)\n", debugstr_a(pszString),
527 cchString, dwFlags, pbBinary, pcbBinary, pdwSkip, pdwFlags);
531 SetLastError(ERROR_INVALID_PARAMETER);
534 /* Only the bottom byte contains valid types */
535 if (dwFlags & 0xfffffff0)
537 SetLastError(ERROR_INVALID_DATA);
542 case CRYPT_STRING_BASE64_ANY:
543 decoder = Base64AnyToBinaryA;
545 case CRYPT_STRING_BASE64:
546 decoder = Base64ToBinaryA;
548 case CRYPT_STRING_BASE64HEADER:
549 decoder = Base64HeaderToBinaryA;
551 case CRYPT_STRING_BASE64REQUESTHEADER:
552 decoder = Base64RequestHeaderToBinaryA;
554 case CRYPT_STRING_BASE64X509CRLHEADER:
555 decoder = Base64X509HeaderToBinaryA;
557 case CRYPT_STRING_BINARY:
558 decoder = DecodeBinaryToBinaryA;
560 case CRYPT_STRING_ANY:
561 decoder = DecodeAnyA;
563 case CRYPT_STRING_HEX:
564 case CRYPT_STRING_HEXASCII:
565 case CRYPT_STRING_HEXADDR:
566 case CRYPT_STRING_HEXASCIIADDR:
567 FIXME("Unimplemented type %d\n", dwFlags & 0x7fffffff);
570 SetLastError(ERROR_INVALID_PARAMETER);
574 cchString = strlen(pszString);
575 ret = decoder(pszString, cchString, pbBinary, pcbBinary, pdwSkip, pdwFlags);
578 return (ret == ERROR_SUCCESS) ? TRUE : FALSE;