Diff: wolfcrypt/src/coding.c

Revision:

17:ff9d1e86ad5f

Parent:

16:048e5e270a58

--- a/wolfcrypt/src/coding.c	Tue Nov 19 14:32:16 2019 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,459 +0,0 @@
-/* coding.c
- *
- * Copyright (C) 2006-2017 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL 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.
- *
- * wolfSSL 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 02110-1335, USA
- */
-
-
-#ifdef HAVE_CONFIG_H
-    #include <config.h>
-#endif
-
-#include <wolfssl/wolfcrypt/settings.h>
-
-#ifndef NO_CODING
-
-#include <wolfssl/wolfcrypt/coding.h>
-#include <wolfssl/wolfcrypt/error-crypt.h>
-#include <wolfssl/wolfcrypt/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) {
-            WOLFSSL_MSG("Bad Base64 Decode data, too small");
-            return ASN_INPUT_E;
-        }
-
-        if (e1 > maxIdx || e2 > maxIdx || e3 > maxIdx || e4 > maxIdx) {
-            WOLFSSL_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') {
-                WOLFSSL_MSG("Bad end of line in Base64 Decode");
-                return ASN_INPUT_E;
-            }
-        }
-    }
-    *outLen = i;
-
-    return 0;
-}
-
-
-#if defined(WOLFSSL_BASE64_ENCODE)
-
-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 getSzOnly)
-{
-    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. Only escape for EncodeEsc */
-    if (escaped == WC_ESC_NL_ENC) {
-        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 && !getSzOnly) {
-        WOLFSSL_MSG("Escape buffer max too small");
-        return BUFFER_E;
-    }
-
-    /* store it */
-    if (doEscape == 0) {
-        if(getSzOnly)
-            idx++;
-        else
-            out[idx++] = basic;
-    }
-    else {
-        if(getSzOnly)
-            idx+=3;
-        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.
-   If out buffer is NULL, will return sz needed in outLen */
-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 */
-
-    int    getSzOnly = (out == NULL);
-
-    word32 outSz = (inLen + 3 - 1) / 3 * 4;
-    word32 addSz = (outSz + PEM_LINE_SZ - 1) / PEM_LINE_SZ;  /* new lines */
-
-    if (escaped == WC_ESC_NL_ENC)
-        addSz *= 3;   /* instead of just \n, we're doing %0A triplet */
-    else if (escaped == WC_NO_NL_ENC)
-        addSz = 0;    /* encode without \n */
-
-    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
-     * Also need to ensure outLen valid before dereference */
-    if (!outLen || (outSz > *outLen && !getSzOnly)) 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, getSzOnly);
-        if (ret != 0) break;
-        ret = CEscape(escaped, e2, out, &i, *outLen, 0, getSzOnly);
-        if (ret != 0) break;
-        ret = CEscape(escaped, e3, out, &i, *outLen, 0, getSzOnly);
-        if (ret != 0) break;
-        ret = CEscape(escaped, e4, out, &i, *outLen, 0, getSzOnly);
-        if (ret != 0) break;
-
-        inLen -= 3;
-
-        /* Insert newline after PEM_LINE_SZ, unless no \n requested */
-        if (escaped != WC_NO_NL_ENC && (++n % (PEM_LINE_SZ/4)) == 0 && inLen){
-            ret = CEscape(escaped, '\n', out, &i, *outLen, 1, getSzOnly);
-            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, getSzOnly);
-        if (ret == 0)
-            ret = CEscape(escaped, e2, out, &i, *outLen, 0, getSzOnly);
-        if (ret == 0) {
-            /* third */
-            if (twoBytes)
-                ret = CEscape(escaped, e3, out, &i, *outLen, 0, getSzOnly);
-            else
-                ret = CEscape(escaped, '=', out, &i, *outLen, 1, getSzOnly);
-        }
-        /* fourth always pad */
-        if (ret == 0)
-            ret = CEscape(escaped, '=', out, &i, *outLen, 1, getSzOnly);
-    }
-
-    if (ret == 0 && escaped != WC_NO_NL_ENC)
-        ret = CEscape(escaped, '\n', out, &i, *outLen, 1, getSzOnly);
-
-    if (i != outSz && escaped != 1 && ret == 0)
-        return ASN_INPUT_E;
-
-    *outLen = i;
-    if(ret == 0)
-        return getSzOnly ? LENGTH_ONLY_E : 0;
-    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, WC_STD_ENC);
-}
-
-
-/* Base64 Encode, with %0A escaped line endings instead of \n */
-int Base64_EncodeEsc(const byte* in, word32 inLen, byte* out, word32* outLen)
-{
-    return DoBase64_Encode(in, inLen, out, outLen, WC_ESC_NL_ENC);
-}
-
-int Base64_Encode_NoNl(const byte* in, word32 inLen, byte* out, word32* outLen)
-{
-    return DoBase64_Encode(in, inLen, out, outLen, WC_NO_NL_ENC);
-}
-
-#endif /* WOLFSSL_BASE64_ENCODE */
-
-
-#ifdef WOLFSSL_BASE16
-
-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 (in == NULL || out == NULL || outLen == NULL)
-        return BAD_FUNC_ARG;
-
-    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;
-}
-
-int Base16_Encode(const byte* in, word32 inLen, byte* out, word32* outLen)
-{
-    word32 outIdx = 0;
-    word32 i;
-    byte   hb, lb;
-
-    if (in == NULL || out == NULL || outLen == NULL)
-        return BAD_FUNC_ARG;
-
-    if (*outLen < (2 * inLen + 1))
-        return BAD_FUNC_ARG;
-
-    for (i = 0; i < inLen; i++) {
-        hb = in[i] >> 4;
-        lb = in[i] & 0x0f;
-
-        /* ASCII value */
-        hb += '0';
-        if (hb > '9')
-            hb += 7;
-
-        /* ASCII value */
-        lb += '0';
-        if (lb>'9')
-            lb += 7;
-
-        out[outIdx++] = hb;
-        out[outIdx++] = lb;
-    }
-
-    /* force 0 at this end */
-    out[outIdx++] = 0;
-
-    *outLen = outIdx;
-    return 0;
-}
-
-#endif /* WOLFSSL_BASE16 */
-
-#endif /* !NO_CODING */
-