Annotation of libaitio/src/crypt.c, revision 1.3
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 ! misho 6: * $Id: crypt.c,v 1.2.2.2 2011/04/20 22:55:42 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: }
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