64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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/* compliant base64 code donated by Wayne Scott (wscott@bitmover.com) */
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#include "mycrypt.h"
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#ifdef BASE64
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static const char *codes =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int base64_encode(const unsigned char *in, unsigned long len,
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unsigned char *out, unsigned long *outlen)
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{
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unsigned long i, len2, leven;
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unsigned char *p;
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_ARGCHK(in != NULL);
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_ARGCHK(out != NULL);
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_ARGCHK(outlen != NULL);
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/* valid output size ? */
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len2 = 4 * ((len + 2) / 3);
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if (*outlen < len2 + 1) {
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return CRYPT_BUFFER_OVERFLOW;
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}
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p = out;
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leven = 3*(len / 3);
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for (i = 0; i < leven; i += 3) {
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*p++ = codes[(in[0] >> 2) & 0x3F];
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*p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F];
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*p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F];
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*p++ = codes[in[2] & 0x3F];
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in += 3;
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}
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/* Pad it if necessary... */
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if (i < len) {
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unsigned a = in[0];
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unsigned b = (i+1 < len) ? in[1] : 0;
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*p++ = codes[(a >> 2) & 0x3F];
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*p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F];
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*p++ = (i+1 < len) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=';
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*p++ = '=';
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}
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/* append a NULL byte */
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*p = '\0';
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/* return ok */
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*outlen = p - out;
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return CRYPT_OK;
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}
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#endif
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