[Opentnl-cvs] tnl/libtomcrypt/misc/base64 base64_decode.c,NONE,1.1 base64_encode.c,NONE,1.1
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From: Mark F. <mar...@us...> - 2005-04-28 17:28:07
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Update of /cvsroot/opentnl/tnl/libtomcrypt/misc/base64 In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv26694/libtomcrypt/misc/base64 Added Files: base64_decode.c base64_encode.c Log Message: Updated to libtomcrypt 1.0.2 Not tested on linux or OS X --- NEW FILE: base64_encode.c --- /* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file base64_encode.c Compliant base64 encoder donated by Wayne Scott (ws...@bi...) */ #ifdef BASE64 static const char *codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /** base64 Encode a buffer (NUL terminated) @param in The input buffer to encode @param inlen The length of the input buffer @param out [out] The destination of the base64 encoded data @param outlen [in/out] The max size and resulting size @return CRYPT_OK if successful */ int base64_encode(const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { unsigned long i, len2, leven; unsigned char *p; LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); /* valid output size ? */ len2 = 4 * ((inlen + 2) / 3); if (*outlen < len2 + 1) { return CRYPT_BUFFER_OVERFLOW; } p = out; leven = 3*(inlen / 3); for (i = 0; i < leven; i += 3) { *p++ = codes[(in[0] >> 2) & 0x3F]; *p++ = codes[(((in[0] & 3) << 4) + (in[1] >> 4)) & 0x3F]; *p++ = codes[(((in[1] & 0xf) << 2) + (in[2] >> 6)) & 0x3F]; *p++ = codes[in[2] & 0x3F]; in += 3; } /* Pad it if necessary... */ if (i < inlen) { unsigned a = in[0]; unsigned b = (i+1 < inlen) ? in[1] : 0; *p++ = codes[(a >> 2) & 0x3F]; *p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F]; *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '='; *p++ = '='; } /* append a NULL byte */ *p = '\0'; /* return ok */ *outlen = p - out; return CRYPT_OK; } #endif --- NEW FILE: base64_decode.c --- /* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tom...@gm..., http://libtomcrypt.org */ #include "tomcrypt.h" /** @file base64_decode.c Compliant base64 code donated by Wayne Scott (ws...@bi...) */ #ifdef BASE64 static const unsigned char map[256] = { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255, 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255, 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }; /** base64 decode a block of memory @param in The base64 data to decode @param inlen The length of the base64 data @param out [out] The destination of the binary decoded data @param outlen [in/out] The max size and resulting size of the decoded data @return CRYPT_OK if successful */ int base64_decode(const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen) { unsigned long t, x, y, z; unsigned char c; int g; LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); LTC_ARGCHK(outlen != NULL); g = 3; for (x = y = z = t = 0; x < inlen; x++) { c = map[in[x]&0xFF]; if (c == 255) continue; /* the final = symbols are read and used to trim the remaining bytes */ if (c == 254) { c = 0; /* prevent g < 0 which would potentially allow an overflow later */ if (--g < 0) { return CRYPT_INVALID_PACKET; } } else if (g != 3) { /* we only allow = to be at the end */ return CRYPT_INVALID_PACKET; } t = (t<<6)|c; if (++y == 4) { if (z + g > *outlen) { return CRYPT_BUFFER_OVERFLOW; } out[z++] = (unsigned char)((t>>16)&255); if (g > 1) out[z++] = (unsigned char)((t>>8)&255); if (g > 2) out[z++] = (unsigned char)(t&255); y = t = 0; } } if (y != 0) { return CRYPT_INVALID_PACKET; } *outlen = z; return CRYPT_OK; } #endif |