Annotation of libaitio/src/crypt.c, revision 1.7
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 $
1.7 ! misho 6: * $Id: crypt.c,v 1.6.6.2 2012/05/23 14:06:08 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:
1.5 misho 15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
1.3 misho 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: /*
1.6 misho 50: * ioCipher() - Cipher wrapper for all supported crypto algorythms
1.5 misho 51: *
1.2 misho 52: * @pInput = input buffer
53: * @inLen = input buffer len
1.7 ! misho 54: * @ppOutput = output allocated buffe, must be io_free after use
1.2 misho 55: * @Cipher = cipher engine, like EVP_bf_cbc() or etc...
56: * @pKey = key
57: * @pIV = IV, salt (8 bytes)
58: * @nMode = Mode 0 - decrypting or 1 - encrypting
59: * return: 0 not present data or error!; >0 number of processed and returned bytes into ppOutput
60: */
61: int
62: ioCipher(u_char *pInput, int inLen, u_char **ppOutput, const EVP_CIPHER *Cipher,
63: u_char *pKey, u_char *pIV, int nMode)
64: {
65: EVP_CIPHER_CTX ctx;
66: int chunk, buflen, outlen = 0;
67: u_char *pos, *buf = NULL;
68:
69: if (!pInput || !inLen || !ppOutput || nMode & 0xFFFFFFFE)
70: return 0;
1.7 ! misho 71: buf = io_malloc(inLen + EVP_MAX_BLOCK_LENGTH);
1.2 misho 72: if (!buf) {
73: LOGERR;
74: goto end;
75: } else
76: memset(buf, 0, inLen + EVP_MAX_BLOCK_LENGTH);
77:
78: EVP_CIPHER_CTX_init(&ctx);
79: EVP_CipherInit_ex(&ctx, Cipher, NULL, pKey, pIV, nMode);
80:
81: for (outlen = 0, buflen = -1, pos = pInput; inLen; outlen += buflen) {
82: chunk = inLen > 7 ? 8 : inLen;
83:
84: if (!EVP_CipherUpdate(&ctx, buf + outlen, &buflen, pos, chunk)) {
85: EVP_CIPHER_CTX_cleanup(&ctx);
86: outlen = 0;
1.7 ! misho 87: io_free(buf);
1.2 misho 88: buf = NULL;
89: goto end;
90: } else {
91: if (nMode && !buflen)
92: break;
93:
94: pos += chunk;
95: inLen -= chunk;
96: }
97: }
98: if (!EVP_CipherFinal_ex(&ctx, buf + outlen, &buflen)) {
99: outlen = 0;
1.7 ! misho 100: io_free(buf);
1.2 misho 101: buf = NULL;
102: } else
103: outlen += buflen;
104:
105: EVP_CIPHER_CTX_cleanup(&ctx);
106: end:
107: *ppOutput = buf;
108: return outlen;
109: }
110:
111: /*
1.6 misho 112: * io_Blowfish() - Blowfish cipher algorythm, work with ASCII hex strings
1.5 misho 113: *
1.2 misho 114: * @pInput = input buffer
115: * @inLen = input buffer len
1.7 ! misho 116: * @ppOutput = output allocated buffe, must be io_free after use
1.2 misho 117: * @pKey = key
118: * @pIV = IV, salt (8 bytes)
119: * @nMode = Mode 0 - decrypting or 1 - encrypting
120: * return: 0 not present data or error!; >0 number of processed and returned bytes into ppOutput
121: */
122: int
123: io_Blowfish(u_char *pInput, int inLen, u_char **ppOutput, u_char *pKey, u_char *pIV, int nMode)
124: {
125: int len, ret;
126: register int i;
127: char bufCH[3], *str = NULL;
128: u_char *buf = NULL;
129:
130: if (!pInput || !inLen || !ppOutput || nMode & 0xFFFFFFFE)
131: return 0;
132:
133: if (nMode) {
134: len = strlen((char*) pInput);
135: str = strdup((char*) pInput);
136: } else {
137: len = strlen((char*) pInput) / 2;
1.7 ! misho 138: str = io_malloc(len + 1);
1.2 misho 139: if (!str) {
140: LOGERR;
141: return 0;
142: } else
143: memset(str, 0, len + 1);
144:
145: for (i = 0; i < len * 2; i += 2) {
146: strlcpy(bufCH, (char*) &pInput[i], 3);
147: str[i / 2] = (u_char) strtol(bufCH, NULL, 16);
148: }
149: }
150:
151: ret = len = ioCipher((u_char*) str, len, &buf, EVP_bf_cbc(), pKey, pIV, nMode);
1.7 ! misho 152: io_free(str);
1.2 misho 153:
154: if (nMode) {
155: ret *= 2;
1.7 ! misho 156: *ppOutput = io_malloc(ret + 1);
1.2 misho 157: if (!*ppOutput) {
158: LOGERR;
159: return 0;
160: } else
161: memset(*ppOutput, 0, ret + 1);
162:
163: for (i = 0; i < len; i++) {
164: memset(bufCH, 0, 3);
165: snprintf(bufCH, 3, "%02x", buf[i]);
166: strlcat((char*) *ppOutput, bufCH, ret + 1);
167: }
168: } else
169: if (ret && buf)
170: *ppOutput = (u_char*) strdup((char*) buf);
171:
172: return ret;
173: }
1.4 misho 174:
175: /*
1.6 misho 176: * io_ctr_AES() - Encrypt/Decrypt stream cipher CTR_AES
1.5 misho 177: *
1.4 misho 178: * @pInput = Input buffer with ASCII
179: * @inLen = Input buffer data length
1.7 ! misho 180: * @ppOutput = Output buffer with cipher data, must be io_free after use
1.4 misho 181: * @pKey = Key
182: * @IV = IVector/Nonce/Counter, Warning: IV must be variable, because we write there!!!
183: * return: -1 error or >-1 how many cipher blocks proceeded
184: */
185: int
186: io_ctr_AES(u_char *pInput, int inLen, u_char **ppOutput, u_char *pKey, u_char IV[AES_BLOCK_SIZE])
187: {
188: u_int num;
189: AES_KEY key;
190: u_char ecount_buf[AES_BLOCK_SIZE] = { 0 };
191: int total = 0;
192:
193: if (!pInput || !inLen || !ppOutput)
194: return -1;
195:
1.7 ! misho 196: *ppOutput = io_malloc(inLen);
1.4 misho 197: if (!*ppOutput) {
198: LOGERR;
199: return -1;
200: } else
201: memset(*ppOutput, 0, inLen);
202:
203: AES_set_encrypt_key(pKey, 128, &key);
204:
205: while (inLen) {
206: num = 0;
207: memset(ecount_buf, 0, sizeof ecount_buf);
208: AES_ctr128_encrypt(pInput + total, (*ppOutput) + total,
209: (inLen / (AES_BLOCK_SIZE - 1)) ? (AES_BLOCK_SIZE - 1) : inLen,
210: &key, IV, ecount_buf, &num);
211: if (num < 1) {
1.7 ! misho 212: io_free(*ppOutput);
1.4 misho 213: *ppOutput = NULL;
214: total = -1;
215: break;
216: } else {
217: total += num;
218: inLen -= num;
219: }
220: }
221:
222: return total;
223: }
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