diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/util/base64.c | 141 | ||||
| -rw-r--r-- | lib/util/util.h | 13 | ||||
| -rw-r--r-- | lib/util/util_str.c | 2 | ||||
| -rwxr-xr-x | lib/util/wscript_build | 2 |
4 files changed, 155 insertions, 3 deletions
diff --git a/lib/util/base64.c b/lib/util/base64.c new file mode 100644 index 0000000000..19ce2d1b85 --- /dev/null +++ b/lib/util/base64.c @@ -0,0 +1,141 @@ +/* + Unix SMB/CIFS implementation. + Samba utility functions + + Copyright (C) Andrew Tridgell 1992-2001 + Copyright (C) Simo Sorce 2001-2002 + Copyright (C) Martin Pool 2003 + Copyright (C) James Peach 2006 + Copyright (C) Jeremy Allison 1992-2007 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" + +static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + +/** + * Decode a base64 string into a DATA_BLOB - simple and slow algorithm + **/ +_PUBLIC_ DATA_BLOB base64_decode_data_blob(const char *s) +{ + int bit_offset, byte_offset, idx, i, n; + DATA_BLOB decoded = data_blob(s, strlen(s)+1); + unsigned char *d = decoded.data; + char *p; + + n=i=0; + + while (*s && (p=strchr_m(b64,*s))) { + idx = (int)(p - b64); + byte_offset = (i*6)/8; + bit_offset = (i*6)%8; + d[byte_offset] &= ~((1<<(8-bit_offset))-1); + if (bit_offset < 3) { + d[byte_offset] |= (idx << (2-bit_offset)); + n = byte_offset+1; + } else { + d[byte_offset] |= (idx >> (bit_offset-2)); + d[byte_offset+1] = 0; + d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF; + n = byte_offset+2; + } + s++; i++; + } + + if ((n > 0) && (*s == '=')) { + n -= 1; + } + + /* fix up length */ + decoded.length = n; + return decoded; +} + +/** + * Decode a base64 string in-place - wrapper for the above + **/ +_PUBLIC_ void base64_decode_inplace(char *s) +{ + DATA_BLOB decoded = base64_decode_data_blob(s); + + if ( decoded.length != 0 ) { + memcpy(s, decoded.data, decoded.length); + + /* null terminate */ + s[decoded.length] = '\0'; + } else { + *s = '\0'; + } + + data_blob_free(&decoded); +} + +/** + * Encode a base64 string into a talloc()ed string caller to free. + * + * From SQUID: adopted from http://ftp.sunet.se/pub2/gnu/vm/base64-encode.c + * with adjustments + **/ + +_PUBLIC_ char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data) +{ + int bits = 0; + int char_count = 0; + size_t out_cnt, len, output_len; + char *result; + + if (!data.length || !data.data) + return NULL; + + out_cnt = 0; + len = data.length; + output_len = data.length * 2 + 4; /* Account for closing bytes. 4 is + * random but should be enough for + * the = and \0 */ + result = talloc_array(mem_ctx, char, output_len); /* get us plenty of space */ + SMB_ASSERT(result != NULL); + + while (len--) { + int c = (unsigned char) *(data.data++); + bits += c; + char_count++; + if (char_count == 3) { + result[out_cnt++] = b64[bits >> 18]; + result[out_cnt++] = b64[(bits >> 12) & 0x3f]; + result[out_cnt++] = b64[(bits >> 6) & 0x3f]; + result[out_cnt++] = b64[bits & 0x3f]; + bits = 0; + char_count = 0; + } else { + bits <<= 8; + } + } + if (char_count != 0) { + bits <<= 16 - (8 * char_count); + result[out_cnt++] = b64[bits >> 18]; + result[out_cnt++] = b64[(bits >> 12) & 0x3f]; + if (char_count == 1) { + result[out_cnt++] = '='; + result[out_cnt++] = '='; + } else { + result[out_cnt++] = b64[(bits >> 6) & 0x3f]; + result[out_cnt++] = '='; + } + } + result[out_cnt] = '\0'; /* terminate */ + return result; +} + diff --git a/lib/util/util.h b/lib/util/util.h index 48d6566dd0..45779912f3 100644 --- a/lib/util/util.h +++ b/lib/util/util.h @@ -410,6 +410,19 @@ _PUBLIC_ int strwicmp(const char *psz1, const char *psz2); _PUBLIC_ void string_replace(char *s, char oldc, char newc); /** + Base64 decode a string, place into a data blob. Caller to data_blob_free() the result. +**/ +_PUBLIC_ DATA_BLOB base64_decode_data_blob(const char *s); +/** + Base64 decode a string, inplace +**/ +_PUBLIC_ void base64_decode_inplace(char *s); +/** + Base64 encode a binary data blob into a string +**/ +_PUBLIC_ char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data); + +/** * Compare 2 strings. * * @note The comparison is case-insensitive. diff --git a/lib/util/util_str.c b/lib/util/util_str.c index 8695266655..41183ff570 100644 --- a/lib/util/util_str.c +++ b/lib/util/util_str.c @@ -320,5 +320,3 @@ _PUBLIC_ void string_replace(char *s, char oldc, char newc) s++; } } - - diff --git a/lib/util/wscript_build b/lib/util/wscript_build index 6aaf04c96e..e39af54c0f 100755 --- a/lib/util/wscript_build +++ b/lib/util/wscript_build @@ -7,7 +7,7 @@ bld.SAMBA_LIBRARY('samba-util-common', util_file.c time.c rbtree.c rfc1738.c select.c genrand.c fsusage.c blocking.c become_daemon.c signal.c system.c params.c util.c util_id.c util_net.c - util_strlist.c idtree.c debug.c fault.c''', + util_strlist.c idtree.c debug.c fault.c base64.c''', public_deps='talloc pthread LIBCRYPTO', # until we get all the dependencies in this library in common # we need to allow this library to be built with unresolved symbols |