Fork of CyaSSL for my specific settings
Fork of CyaSSL by
ctaocrypt/src/coding.c
- Committer:
- d0773d
- Date:
- 2015-03-03
- Revision:
- 4:28ac50e1d49c
- Parent:
- 0:1239e9b70ca2
File content as of revision 4:28ac50e1d49c:
/* coding.c * * Copyright (C) 2006-2014 wolfSSL Inc. * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <cyassl/ctaocrypt/settings.h> #ifndef NO_CODING #include <cyassl/ctaocrypt/coding.h> #include <cyassl/ctaocrypt/error-crypt.h> #include <cyassl/ctaocrypt/logging.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 Base64_Decode(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 ); const byte maxIdx = (byte)sizeof(base64Decode) + 0x2B - 1; plainSz = (plainSz * 3 + 3) / 4; if (plainSz > *outLen) return BAD_FUNC_ARG; 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; if (e1 < 0x2B || e2 < 0x2B || e3 < 0x2B || e4 < 0x2B) { CYASSL_MSG("Bad Base64 Decode data, too small"); return ASN_INPUT_E; } if (e1 > maxIdx || e2 > maxIdx || e3 > maxIdx || e4 > maxIdx) { CYASSL_MSG("Bad Base64 Decode data, too big"); return ASN_INPUT_E; } e1 = base64Decode[e1 - 0x2B]; e2 = base64Decode[e2 - 0x2B]; e3 = (e3 == PAD) ? 0 : base64Decode[e3 - 0x2B]; e4 = (e4 == PAD) ? 0 : base64Decode[e4 - 0x2B]; b1 = (byte)((e1 << 2) | (e2 >> 4)); b2 = (byte)(((e2 & 0xF) << 4) | (e3 >> 2)); b3 = (byte)(((e3 & 0x3) << 6) | e4); out[i++] = b1; if (!pad3) out[i++] = b2; if (!pad4) out[i++] = b3; else break; inLen -= 4; if (inLen && (in[j] == ' ' || in[j] == '\r' || in[j] == '\n')) { byte endLine = in[j++]; inLen--; while (inLen && endLine == ' ') { /* allow trailing whitespace */ endLine = in[j++]; inLen--; } if (endLine == '\r') { if (inLen) { endLine = in[j++]; inLen--; } } if (endLine != '\n') { CYASSL_MSG("Bad end of line in Base64 Decode"); return ASN_INPUT_E; } } } *outLen = i; return 0; } #if defined(OPENSSL_EXTRA) || defined (SESSION_CERTS) || defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN) || defined(HAVE_WEBSERVER) 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', '+', '/' }; /* make sure *i (idx) won't exceed max, store and possibly escape to out, * raw means use e w/o decode, 0 on success */ static int CEscape(int escaped, byte e, byte* out, word32* i, word32 max, int raw) { int doEscape = 0; word32 needed = 1; word32 idx = *i; byte basic; byte plus = 0; byte equals = 0; byte newline = 0; if (raw) basic = e; else basic = base64Encode[e]; /* check whether to escape */ if (escaped) { switch ((char)basic) { case '+' : plus = 1; doEscape = 1; needed += 2; break; case '=' : equals = 1; doEscape = 1; needed += 2; break; case '\n' : newline = 1; doEscape = 1; needed += 2; break; default: /* do nothing */ break; } } /* check size */ if ( (idx+needed) > max) { CYASSL_MSG("Escape buffer max too small"); return BUFFER_E; } /* store it */ if (doEscape == 0) { out[idx++] = basic; } else { out[idx++] = '%'; /* start escape */ if (plus) { out[idx++] = '2'; out[idx++] = 'B'; } else if (equals) { out[idx++] = '3'; out[idx++] = 'D'; } else if (newline) { out[idx++] = '0'; out[idx++] = 'A'; } } *i = idx; return 0; } /* internal worker, handles both escaped and normal line endings */ static int DoBase64_Encode(const byte* in, word32 inLen, byte* out, word32* outLen, int escaped) { int ret = 0; word32 i = 0, j = 0, n = 0; /* new line counter */ word32 outSz = (inLen + 3 - 1) / 3 * 4; word32 addSz = (outSz + PEM_LINE_SZ - 1) / PEM_LINE_SZ; /* new lines */ if (escaped) addSz *= 3; /* instead of just \n, we're doing %0A triplet */ outSz += addSz; /* if escaped we can't predetermine size for one pass encoding, but * make sure we have enough if no escapes are in input */ if (outSz > *outLen) return BAD_FUNC_ARG; while (inLen > 2) { byte b1 = in[j++]; byte b2 = in[j++]; byte b3 = in[j++]; /* encoded idx */ byte e1 = b1 >> 2; byte e2 = (byte)(((b1 & 0x3) << 4) | (b2 >> 4)); byte e3 = (byte)(((b2 & 0xF) << 2) | (b3 >> 6)); byte e4 = b3 & 0x3F; /* store */ ret = CEscape(escaped, e1, out, &i, *outLen, 0); if (ret != 0) break; ret = CEscape(escaped, e2, out, &i, *outLen, 0); if (ret != 0) break; ret = CEscape(escaped, e3, out, &i, *outLen, 0); if (ret != 0) break; ret = CEscape(escaped, e4, out, &i, *outLen, 0); if (ret != 0) break; inLen -= 3; if ((++n % (PEM_LINE_SZ / 4)) == 0 && inLen) { ret = CEscape(escaped, '\n', out, &i, *outLen, 1); if (ret != 0) break; } } /* last integral */ if (inLen && ret == 0) { int twoBytes = (inLen == 2); byte b1 = in[j++]; byte b2 = (twoBytes) ? in[j++] : 0; byte e1 = b1 >> 2; byte e2 = (byte)(((b1 & 0x3) << 4) | (b2 >> 4)); byte e3 = (byte)((b2 & 0xF) << 2); ret = CEscape(escaped, e1, out, &i, *outLen, 0); if (ret == 0) ret = CEscape(escaped, e2, out, &i, *outLen, 0); if (ret == 0) { /* third */ if (twoBytes) ret = CEscape(escaped, e3, out, &i, *outLen, 0); else ret = CEscape(escaped, '=', out, &i, *outLen, 1); } /* fourth always pad */ if (ret == 0) ret = CEscape(escaped, '=', out, &i, *outLen, 1); } if (ret == 0) ret = CEscape(escaped, '\n', out, &i, *outLen, 1); if (i != outSz && escaped == 0 && ret == 0) return ASN_INPUT_E; *outLen = i; return ret; } /* Base64 Encode, PEM style, with \n line endings */ int Base64_Encode(const byte* in, word32 inLen, byte* out, word32* outLen) { return DoBase64_Encode(in, inLen, out, outLen, 0); } /* Base64 Encode, with %0A esacped line endings instead of \n */ int Base64_EncodeEsc(const byte* in, word32 inLen, byte* out, word32* outLen) { return DoBase64_Encode(in, inLen, out, outLen, 1); } #endif /* defined(OPENSSL_EXTRA) || defined (SESSION_CERTS) || defined(CYASSL_KEY_GEN) || defined(CYASSL_CERT_GEN) || defined(HAVE_WEBSERVER) */ #if defined(OPENSSL_EXTRA) || defined(HAVE_WEBSERVER) || defined(HAVE_FIPS) 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, /* upper case A-F */ BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, BAD, /* G - ` */ 10, 11, 12, 13, 14, 15 /* lower case a-f */ }; /* A starts at 0x41 not 0x3A */ int Base16_Decode(const byte* in, word32 inLen, byte* out, word32* outLen) { word32 inIdx = 0; word32 outIdx = 0; if (inLen == 1 && *outLen && in) { byte b = in[inIdx++] - 0x30; /* 0 starts at 0x30 */ /* sanity check */ if (b >= sizeof(hexDecode)/sizeof(hexDecode[0])) return ASN_INPUT_E; b = hexDecode[b]; if (b == BAD) return ASN_INPUT_E; out[outIdx++] = b; *outLen = outIdx; return 0; } if (inLen % 2) return BAD_FUNC_ARG; if (*outLen < (inLen / 2)) return BAD_FUNC_ARG; 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 ASN_INPUT_E; if (b2 >= sizeof(hexDecode)/sizeof(hexDecode[0])) return ASN_INPUT_E; b = hexDecode[b]; b2 = hexDecode[b2]; if (b == BAD || b2 == BAD) return ASN_INPUT_E; out[outIdx++] = (byte)((b << 4) | b2); inLen -= 2; } *outLen = outIdx; return 0; } #endif /* (OPENSSL_EXTRA) || (HAVE_WEBSERVER) || (HAVE_FIPS) */ #endif /* NO_CODING */