Varun Bahl
cya_u
Fork of
CyaSSL-forEncrypt
by 
Mobius IoT
Diff: coding.c
- Revision:
- 0:5045d2638c29
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/coding.c Sat Feb 05 01:09:17 2011 +0000
@@ -0,0 +1,229 @@
+/* coding.c
+ *
+ * Copyright (C) 2006-2009 Sawtooth Consulting Ltd.
+ *
+ * This file is part of CyaSSL.
+ *
+ * CyaSSL 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * CyaSSL 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+#include "coding.h"
+
+
+enum {
+ BAD = 0xFF, /* invalid encoding */
+ PAD = '=',
+ PEM_LINE_SZ = 64
+};
+
+
+static
+const byte base64Decode[] = { 62, BAD, BAD, BAD, 63, /* + starts at 0x2B */
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
+ BAD, BAD, BAD, BAD, BAD, BAD, BAD,
+ 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,
+ BAD, BAD, BAD, BAD, BAD, BAD,
+ 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
+ };
+
+
+int Base64Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
+{
+ word32 i = 0;
+ word32 j = 0;
+ word32 plainSz = inLen - ((inLen + (PEM_LINE_SZ - 1)) / PEM_LINE_SZ );
+
+ plainSz = (plainSz * 3 + 3) / 4;
+ if (plainSz > *outLen) return -1;
+
+ while (inLen > 3) {
+ byte b1, b2, b3;
+ byte e1 = in[j++];
+ byte e2 = in[j++];
+ byte e3 = in[j++];
+ byte e4 = in[j++];
+
+ int pad3 = 0;
+ int pad4 = 0;
+
+ if (e1 == 0) /* end file 0's */
+ break;
+ if (e3 == PAD)
+ pad3 = 1;
+ if (e4 == PAD)
+ pad4 = 1;
+
+ e1 = base64Decode[e1 - 0x2B];
+ e2 = base64Decode[e2 - 0x2B];
+ e3 = (e3 == PAD) ? 0 : base64Decode[e3 - 0x2B];
+ e4 = (e4 == PAD) ? 0 : base64Decode[e4 - 0x2B];
+
+ b1 = (e1 << 2) | (e2 >> 4);
+ b2 = ((e2 & 0xF) << 4) | (e3 >> 2);
+ b3 = ((e3 & 0x3) << 6) | e4;
+
+ out[i++] = b1;
+ if (!pad3)
+ out[i++] = b2;
+ if (!pad4)
+ out[i++] = b3;
+ else
+ break;
+
+ inLen -= 4;
+ if (in[j] == ' ' || in[j] == '\r' || in[j] == '\n') {
+ byte endLine = in[j++];
+ inLen--;
+ while (endLine == ' ') { /* allow trailing whitespace */
+ endLine = in[j++];
+ inLen--;
+ }
+ if (endLine == '\r') {
+ endLine = in[j++];
+ inLen--;
+ }
+ if (endLine != '\n')
+ return -1;
+ }
+ }
+ *outLen = i;
+
+ return 0;
+}
+
+
+#if defined(OPENSSL_EXTRA) || defined (SESSION_CERTS) || defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN)
+
+static
+const byte base64Encode[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
+ 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
+ 'U', 'V', 'W', 'X', 'Y', 'Z',
+ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
+ 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't',
+ 'u', 'v', 'w', 'x', 'y', 'z',
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ '+', '/'
+ };
+
+
+/* porting assistance from yaSSL by Raphael HUCK */
+int Base64Encode(const byte* in, word32 inLen, byte* out, word32* outLen)
+{
+ word32 i = 0,
+ j = 0,
+ n = 0; /* new line counter */
+
+ word32 outSz = (inLen + 3 - 1) / 3 * 4;
+ outSz += (outSz + PEM_LINE_SZ - 1) / PEM_LINE_SZ; /* new lines */
+
+ if (outSz > *outLen) return -1;
+
+ while (inLen > 2) {
+ byte b1 = in[j++];
+ byte b2 = in[j++];
+ byte b3 = in[j++];
+
+ /* encoded idx */
+ byte e1 = b1 >> 2;
+ byte e2 = ((b1 & 0x3) << 4) | (b2 >> 4);
+ byte e3 = ((b2 & 0xF) << 2) | (b3 >> 6);
+ byte e4 = b3 & 0x3F;
+
+ /* store */
+ out[i++] = base64Encode[e1];
+ out[i++] = base64Encode[e2];
+ out[i++] = base64Encode[e3];
+ out[i++] = base64Encode[e4];
+
+ inLen -= 3;
+
+ if ((++n % (PEM_LINE_SZ / 4)) == 0 && inLen)
+ out[i++] = '\n';
+ }
+
+ /* last integral */
+ if (inLen) {
+ int twoBytes = (inLen == 2);
+
+ byte b1 = in[j++];
+ byte b2 = (twoBytes) ? in[j++] : 0;
+
+ byte e1 = b1 >> 2;
+ byte e2 = ((b1 & 0x3) << 4) | (b2 >> 4);
+ byte e3 = (b2 & 0xF) << 2;
+
+ out[i++] = base64Encode[e1];
+ out[i++] = base64Encode[e2];
+ out[i++] = (twoBytes) ? base64Encode[e3] : PAD;
+ out[i++] = PAD;
+ }
+
+ out[i++] = '\n';
+ if (i != outSz)
+ return -1;
+ *outLen = outSz;
+
+ return 0;
+}
+
+
+static
+const byte hexDecode[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+ BAD, BAD, BAD, BAD, BAD, BAD, BAD,
+ 10, 11, 12, 13, 14, 15
+ }; /* A starts at 0x41 not 0x3A */
+
+int Base16Decode(const byte* in, word32 inLen, byte* out, word32* outLen)
+{
+ word32 inIdx = 0;
+ word32 outIdx = 0;
+
+ if (inLen % 2)
+ return -1;
+
+ if (*outLen < (inLen / 2))
+ return -1;
+
+ while (inLen) {
+ byte b = in[inIdx++] - 0x30; /* 0 starts at 0x30 */
+ byte b2 = in[inIdx++] - 0x30;
+
+ /* sanity checks */
+ if (b >= sizeof(hexDecode)/sizeof(hexDecode[0]))
+ return -1;
+ if (b2 >= sizeof(hexDecode)/sizeof(hexDecode[0]))
+ return -1;
+
+ b = hexDecode[b];
+ b2 = hexDecode[b2];
+
+ if (b == BAD || b2 == BAD)
+ return -1;
+
+ out[outIdx++] = (b << 4) | b2;
+ inLen -= 2;
+ }
+
+ *outLen = outIdx;
+ return 0;
+}
+
+
+#endif /* OPENSSL_EXTRA */