Annotation of libaitio/src/crypt.c, revision 1.3.8.1

1.2       misho       1: /*************************************************************************
1.3       misho       2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
                      3: *  by Michael Pounov <misho@elwix.org>
1.2       misho       4: *
                      5: * $Author: misho $
1.3.8.1 ! misho       6: * $Id: crypt.c,v 1.3 2011/04/20 22:56:32 misho Exp $
1.2       misho       7: *
1.3       misho       8: **************************************************************************
                      9: The ELWIX and AITNET software is distributed under the following
                     10: terms:
                     11: 
                     12: All of the documentation and software included in the ELWIX and AITNET
                     13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
                     14: 
                     15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
                     16:        by Michael Pounov <misho@elwix.org>.  All rights reserved.
                     17: 
                     18: Redistribution and use in source and binary forms, with or without
                     19: modification, are permitted provided that the following conditions
                     20: are met:
                     21: 1. Redistributions of source code must retain the above copyright
                     22:    notice, this list of conditions and the following disclaimer.
                     23: 2. Redistributions in binary form must reproduce the above copyright
                     24:    notice, this list of conditions and the following disclaimer in the
                     25:    documentation and/or other materials provided with the distribution.
                     26: 3. All advertising materials mentioning features or use of this software
                     27:    must display the following acknowledgement:
                     28: This product includes software developed by Michael Pounov <misho@elwix.org>
                     29: ELWIX - Embedded LightWeight unIX and its contributors.
                     30: 4. Neither the name of AITNET nor the names of its contributors
                     31:    may be used to endorse or promote products derived from this software
                     32:    without specific prior written permission.
                     33: 
                     34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
                     35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     37: ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     44: SUCH DAMAGE.
                     45: */
1.2       misho      46: #include "global.h"
                     47: 
                     48: 
                     49: /*
                     50:  * ioCipher() Cipher wrapper for all supported crypto algorythms
                     51:  * @pInput = input buffer
                     52:  * @inLen = input buffer len
                     53:  * @ppOutput = output allocated buffe, must be free after use
                     54:  * @Cipher = cipher engine, like EVP_bf_cbc() or etc...
                     55:  * @pKey = key
                     56:  * @pIV = IV, salt (8 bytes)
                     57:  * @nMode = Mode 0 - decrypting or 1 - encrypting
                     58:  * return: 0 not present data or error!; >0 number of processed and returned bytes into ppOutput
                     59: */
                     60: int
                     61: ioCipher(u_char *pInput, int inLen, u_char **ppOutput, const EVP_CIPHER *Cipher, 
                     62:                u_char *pKey, u_char *pIV, int nMode)
                     63: {
                     64:        EVP_CIPHER_CTX ctx;
                     65:        int chunk, buflen, outlen = 0;
                     66:        u_char *pos, *buf = NULL;
                     67: 
                     68:        if (!pInput || !inLen || !ppOutput || nMode & 0xFFFFFFFE)
                     69:                return 0;
                     70:        buf = malloc(inLen + EVP_MAX_BLOCK_LENGTH);
                     71:        if (!buf) {
                     72:                LOGERR;
                     73:                goto end;
                     74:        } else
                     75:                memset(buf, 0, inLen + EVP_MAX_BLOCK_LENGTH);
                     76: 
                     77:        EVP_CIPHER_CTX_init(&ctx);
                     78:        EVP_CipherInit_ex(&ctx, Cipher, NULL, pKey, pIV, nMode);
                     79: 
                     80:        for (outlen = 0, buflen = -1, pos = pInput; inLen; outlen += buflen) {
                     81:                chunk = inLen > 7 ? 8 : inLen;
                     82: 
                     83:                if (!EVP_CipherUpdate(&ctx, buf + outlen, &buflen, pos, chunk)) {
                     84:                        EVP_CIPHER_CTX_cleanup(&ctx);
                     85:                        outlen = 0;
                     86:                        free(buf);
                     87:                        buf = NULL;
                     88:                        goto end;
                     89:                } else {
                     90:                        if (nMode && !buflen)
                     91:                                break;
                     92: 
                     93:                        pos += chunk;
                     94:                        inLen -= chunk;
                     95:                }
                     96:        }
                     97:        if (!EVP_CipherFinal_ex(&ctx, buf + outlen, &buflen)) {
                     98:                outlen = 0;
                     99:                free(buf);
                    100:                buf = NULL;
                    101:        } else
                    102:                outlen += buflen;
                    103: 
                    104:        EVP_CIPHER_CTX_cleanup(&ctx);
                    105: end:
                    106:        *ppOutput = buf;
                    107:        return outlen;
                    108: }
                    109: 
                    110: /*
                    111:  * io_Blowfish() Blowfish cipher algorythm, work with ASCII hex strings
                    112:  * @pInput = input buffer
                    113:  * @inLen = input buffer len
                    114:  * @ppOutput = output allocated buffe, must be free after use
                    115:  * @pKey = key
                    116:  * @pIV = IV, salt (8 bytes)
                    117:  * @nMode = Mode 0 - decrypting or 1 - encrypting
                    118:  * return: 0 not present data or error!; >0 number of processed and returned bytes into ppOutput
                    119: */
                    120: int
                    121: io_Blowfish(u_char *pInput, int inLen, u_char **ppOutput, u_char *pKey, u_char *pIV, int nMode)
                    122: {
                    123:        int len, ret;
                    124:        register int i;
                    125:        char bufCH[3], *str = NULL;
                    126:        u_char *buf = NULL;
                    127: 
                    128:        if (!pInput || !inLen || !ppOutput || nMode & 0xFFFFFFFE)
                    129:                return 0;
                    130: 
                    131:        if (nMode) {
                    132:                len = strlen((char*) pInput);
                    133:                str = strdup((char*) pInput);
                    134:        } else {
                    135:                len = strlen((char*) pInput) / 2;
                    136:                str = malloc(len + 1);
                    137:                if (!str) {
                    138:                        LOGERR;
                    139:                        return 0;
                    140:                } else
                    141:                        memset(str, 0, len + 1);
                    142: 
                    143:                for (i = 0; i < len * 2; i += 2) {
                    144:                        strlcpy(bufCH, (char*) &pInput[i], 3);
                    145:                        str[i / 2] = (u_char) strtol(bufCH, NULL, 16);
                    146:                }
                    147:        }
                    148: 
                    149:        ret = len = ioCipher((u_char*) str, len, &buf, EVP_bf_cbc(), pKey, pIV, nMode);
                    150:        free(str);
                    151: 
                    152:        if (nMode) {
                    153:                ret *= 2;
                    154:                *ppOutput = malloc(ret + 1);
                    155:                if (!*ppOutput) {
                    156:                        LOGERR;
                    157:                        return 0;
                    158:                } else
                    159:                        memset(*ppOutput, 0, ret + 1);
                    160: 
                    161:                for (i = 0; i < len; i++) {
                    162:                        memset(bufCH, 0, 3);
                    163:                        snprintf(bufCH, 3, "%02x", buf[i]);
                    164:                        strlcat((char*) *ppOutput, bufCH, ret + 1);
                    165:                }
                    166:        } else
                    167:                if (ret && buf)
                    168:                        *ppOutput = (u_char*) strdup((char*) buf);
                    169: 
                    170:        return ret;
                    171: }
1.3.8.1 ! misho     172: 
        !           173: /*
        !           174:  * io_ctr_AES() Encrypt/Decrypt stream cipher CTR_AES
        !           175:  * @pInput = Input buffer with ASCII
        !           176:  * @inLen = Input buffer data length
        !           177:  * @ppOutput = Output buffer with cipher data, must be free after use
        !           178:  * @pKey = Key
        !           179:  * return: -1 error or >-1 how many cipher blocks proceeded
        !           180:  */
        !           181: int
        !           182: io_ctr_AES(u_char *pInput, int inLen, u_char **ppOutput, u_char *pKey)
        !           183: {
        !           184:        u_int num;
        !           185:        AES_KEY key;
        !           186:        u_char ivec[AES_BLOCK_SIZE] = { 0 }, ecount_buf[AES_BLOCK_SIZE] = { 0 };
        !           187:        int total = 0;
        !           188: 
        !           189:        if (!pInput || !inLen || !ppOutput)
        !           190:                return -1;
        !           191: 
        !           192:        *ppOutput = malloc(inLen);
        !           193:        if (!*ppOutput) {
        !           194:                LOGERR;
        !           195:                return -1;
        !           196:        } else
        !           197:                memset(*ppOutput, 0, inLen);
        !           198: 
        !           199:        AES_set_encrypt_key(pKey, 128, &key);
        !           200: 
        !           201:        while (inLen) {
        !           202:                num = 0;
        !           203:                memset(ecount_buf, 0, sizeof ecount_buf);
        !           204:                AES_ctr128_encrypt(pInput + total, (*ppOutput) + total, 
        !           205:                                (inLen / (AES_BLOCK_SIZE - 1)) ? (AES_BLOCK_SIZE - 1) : inLen, 
        !           206:                                &key, ivec, ecount_buf, &num);
        !           207:                if (num < 1) {
        !           208:                        free(*ppOutput);
        !           209:                        *ppOutput = NULL;
        !           210:                        total = -1;
        !           211:                        break;
        !           212:                } else {
        !           213:                        total += num;
        !           214:                        inLen -= num;
        !           215:                }
        !           216:        }
        !           217: 
        !           218:        return total;
        !           219: }

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