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Diffstat (limited to 'framework/src/suricata/src/util-base64.c')
| -rw-r--r-- | framework/src/suricata/src/util-base64.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/framework/src/suricata/src/util-base64.c b/framework/src/suricata/src/util-base64.c deleted file mode 100644 index bea92d52..00000000 --- a/framework/src/suricata/src/util-base64.c +++ /dev/null @@ -1,151 +0,0 @@ -/* Copyright (C) 2007-2012 Open Information Security Foundation - * - * You can copy, redistribute or modify this Program under the terms of - * the GNU General Public License version 2 as published by the Free - * Software Foundation. - * - * 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 - * version 2 along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -/** - * \file - * - * \author David Abarbanel <david.abarbanel@baesystems.com> - * - */ - -#include "util-base64.h" - -/* Constants */ -#define BASE64_TABLE_MAX 122 - -/* Base64 character to index conversion table */ -/* Characters are mapped as "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" */ -static const int b64table[] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, - 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, - -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1, -1, 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 }; - -/** - * \brief Gets a base64-decoded value from an encoded character - * - * \param c The encoded character - * - * \return The decoded value (0 or above), or -1 if the parameter is invalid - */ -static inline int GetBase64Value(uint8_t c) -{ - int val = -1; - - /* Pull from conversion table */ - if (c <= BASE64_TABLE_MAX) { - val = b64table[(int) c]; - } - - return val; -} - -/** - * \brief Decodes a 4-byte base64-encoded block into a 3-byte ascii-encoded block - * - * \param ascii the 3-byte ascii output block - * \param b64 the 4-byte base64 input block - * - * \return none - */ -static inline void DecodeBase64Block(uint8_t ascii[ASCII_BLOCK], uint8_t b64[B64_BLOCK]) -{ - ascii[0] = (uint8_t) (b64[0] << 2) | (b64[1] >> 4); - ascii[1] = (uint8_t) (b64[1] << 4) | (b64[2] >> 2); - ascii[2] = (uint8_t) (b64[2] << 6) | (b64[3]); -} - -/** - * \brief Decodes a base64-encoded string buffer into an ascii-encoded byte buffer - * - * \param dest The destination byte buffer - * \param src The source string - * \param len The length of the source string - * \param strict If set file on invalid byte, otherwise return what has been - * decoded. - * - * \return Number of bytes decoded, or 0 if no data is decoded or it fails - */ -uint32_t DecodeBase64(uint8_t *dest, const uint8_t *src, uint32_t len, - int strict) -{ - int val; - uint32_t padding = 0, numDecoded = 0, bbidx = 0, valid = 1, i; - uint8_t *dptr = dest; - uint8_t b64[B64_BLOCK] = { 0,0,0,0 }; - - /* Traverse through each alpha-numeric letter in the source array */ - for(i = 0; i < len && src[i] != 0; i++) { - - /* Get decimal representation */ - val = GetBase64Value(src[i]); - if (val < 0) { - - /* Invalid character found, so decoding fails */ - if (src[i] != '=') { - valid = 0; - if (strict) { - numDecoded = 0; - } - break; - } - padding++; - } - - /* For each alpha-numeric letter in the source array, find the numeric - * value */ - b64[bbidx++] = (val > 0 ? val : 0); - - /* Decode every 4 base64 bytes into 3 ascii bytes */ - if (bbidx == B64_BLOCK) { - - /* For every 4 bytes, add 3 bytes but deduct the '=' padded blocks */ - numDecoded += ASCII_BLOCK - (padding < B64_BLOCK ? - padding : ASCII_BLOCK); - - /* Decode base-64 block into ascii block and move pointer */ - DecodeBase64Block(dptr, b64); - dptr += ASCII_BLOCK; - - /* Reset base-64 block and index */ - bbidx = 0; - padding = 0; - } - } - - /* Finish remaining b64 bytes by padding */ - if (valid && bbidx > 0) { - - /* Decode remaining */ - numDecoded += ASCII_BLOCK - (B64_BLOCK - bbidx); - DecodeBase64Block(dptr, b64); - } - - if (numDecoded == 0) { - SCLogDebug("base64 decoding failed"); - } - - return numDecoded; -} |