diff options
Diffstat (limited to 'core/lib/libtomcrypt/src/misc/base64/base64_encode.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/misc/base64/base64_encode.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/misc/base64/base64_encode.c b/core/lib/libtomcrypt/src/misc/base64/base64_encode.c new file mode 100644 index 0000000..822c174 --- /dev/null +++ b/core/lib/libtomcrypt/src/misc/base64/base64_encode.c @@ -0,0 +1,147 @@ +/* + * Copyright (c) 2001-2007, Tom St Denis + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* 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, tomstdenis@gmail.com, http://libtom.org + */ +#include "tomcrypt.h" + +/** + @file base64_encode.c + Compliant base64 encoder donated by Wayne Scott (wscott@bitmover.com) + base64 URL Safe variant (RFC 4648 section 5) by Karel Miko +*/ + + +#if defined(LTC_BASE64) || defined (LTC_BASE64_URL) + +#if defined(LTC_BASE64) +static const char *codes_base64 = +"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; +#endif /* LTC_BASE64 */ + +#if defined(LTC_BASE64_URL) +static const char *codes_base64url = +"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; +#endif /* LTC_BASE64_URL */ + +static int _base64_encode_internal(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + const char *codes, int pad) +{ + 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) { + *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]; + if (pad) { + *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '='; + *p++ = '='; + } + else { + if (i+1 < inlen) *p++ = codes[(((b & 0xf) << 2)) & 0x3F]; + } + } + + /* append a NULL byte */ + *p = '\0'; + + /* return ok */ + *outlen = p - out; + return CRYPT_OK; +} + +#if defined(LTC_BASE64) +/** + 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) +{ + return _base64_encode_internal(in, inlen, out, outlen, codes_base64, 1); +} +#endif /* LTC_BASE64 */ + + +#if defined(LTC_BASE64_URL) +/** + base64 (URL Safe, RFC 4648 section 5) 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 base64url_encode(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 0); +} +#endif /* LTC_BASE64_URL */ + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/misc/base64/base64_encode.c,v $ */ +/* $Revision: 1.7 $ */ +/* $Date: 2007/05/12 14:32:35 $ */ |