diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/base64.c | 189 | ||||
| -rw-r--r-- | lib/base64.h | 17 |
2 files changed, 206 insertions, 0 deletions
diff --git a/lib/base64.c b/lib/base64.c new file mode 100644 index 0000000..1e7e192 --- /dev/null +++ b/lib/base64.c @@ -0,0 +1,189 @@ +/* +The compilation of software known as FreeBSD is distributed under the +following terms: + +Copyright (c) 1992-2014 The FreeBSD Project. 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 AUTHOR 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 AUTHOR 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. +*/ + +/* + * Base64 encoding/decoding (RFC1341) + * Copyright (c) 2005-2011, Jouni Malinen <j@w1.fi> + * + * This software may be distributed under the terms of the BSD license. + * See README for more details. + */ + +#include "base64.h" + +static const unsigned char base64_table[65] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +/** + * base64_encode - Base64 encode + * @src: Data to be encoded + * @len: Length of the data to be encoded + * @out_len: Pointer to output length variable, or %NULL if not used + * Returns: Allocated buffer of out_len bytes of encoded data, + * or %NULL on failure + * + * Caller is responsible for freeing the returned buffer. Returned buffer is + * nul terminated to make it easier to use as a C string. The nul terminator is + * not included in out_len. + */ + +size_t base64_encode_size(size_t len) +{ + size_t olen; + olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */ + olen += olen / 72; /* line feeds */ + olen++; /* nul termination */ + Assert(olen >= len); + return olen; +} + +void base64_encode(const unsigned char *src, size_t len, + unsigned char *out, size_t *out_len) +{ + unsigned char *pos; + const unsigned char *end, *in; + int line_len; + + Assert(out != NULL) + + end = src + len; + in = src; + pos = out; + line_len = 0; + while (end - in >= 3) { + *pos++ = base64_table[in[0] >> 2]; + *pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)]; + *pos++ = base64_table[((in[1] & 0x0f) << 2) | (in[2] >> 6)]; + *pos++ = base64_table[in[2] & 0x3f]; + in += 3; + line_len += 4; + if (line_len >= 72) { + *pos++ = '\n'; + line_len = 0; + } + } + + if (end - in) { + *pos++ = base64_table[in[0] >> 2]; + if (end - in == 1) { + *pos++ = base64_table[(in[0] & 0x03) << 4]; + *pos++ = '='; + } else { + *pos++ = base64_table[((in[0] & 0x03) << 4) | + (in[1] >> 4)]; + *pos++ = base64_table[(in[1] & 0x0f) << 2]; + } + *pos++ = '='; + line_len += 4; + } + + if (line_len) + *pos++ = '\n'; + + *pos = '\0'; + if (out_len) + *out_len = pos - out; +} + + +/** + * base64_decode - Base64 decode + * @src: Data to be decoded + * @len: Length of the data to be decoded + * @out_len: Pointer to output length variable + * Returns: Allocated buffer of out_len bytes of decoded data, + * or %NULL on failure + * + * Caller is responsible for freeing the returned buffer. + */ +unsigned char * base64_decode(const unsigned char *src, size_t len, + size_t *out_len) +{ + unsigned char dtable[256], *out, *pos, block[4], tmp; + size_t i, count, olen; + int pad = 0; + + // paranoid + // os_memset(dtable, 0x80, 256); + for (i = 0; i < 256; i++) { + dtable[i] = 0x80; + } + + for (i = 0; i < sizeof(base64_table) - 1; i++) + dtable[base64_table[i]] = (unsigned char) i; + dtable[(int)'='] = 0; + + count = 0; + for (i = 0; i < len; i++) { + if (dtable[src[i]] != 0x80) + count++; + } + + if (count == 0 || count % 4) + return NULL; + + olen = count / 4 * 3; + // pos = out = os_malloc(olen); + pos = out = NULL; + Assert(0); + if (out == NULL) + return NULL; + + count = 0; + for (i = 0; i < len; i++) { + tmp = dtable[src[i]]; + if (tmp == 0x80) + continue; + + if (src[i] == '=') + pad++; + block[count] = tmp; + count++; + if (count == 4) { + *pos++ = (block[0] << 2) | (block[1] >> 4); + *pos++ = (block[1] << 4) | (block[2] >> 2); + *pos++ = (block[2] << 6) | block[3]; + count = 0; + if (pad) { + if (pad == 1) + pos--; + else if (pad == 2) + pos -= 2; + else { + /* Invalid padding */ + return NULL; + } + break; + } + } + } + + *out_len = pos - out; + return out; +} + diff --git a/lib/base64.h b/lib/base64.h new file mode 100644 index 0000000..aa21fd0 --- /dev/null +++ b/lib/base64.h @@ -0,0 +1,17 @@ +/* + * Base64 encoding/decoding (RFC1341) + * Copyright (c) 2005, Jouni Malinen <j@w1.fi> + * + * This software may be distributed under the terms of the BSD license. + * See README for more details. + */ + +#ifndef BASE64_H +#define BASE64_H + +unsigned char * base64_encode(const unsigned char *src, size_t len, + size_t *out_len); +unsigned char * base64_decode(const unsigned char *src, size_t len, + size_t *out_len); + +#endif /* BASE64_H */ |