446 lines
11 KiB
C
446 lines
11 KiB
C
/* crypto/evp/encode.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/evp.h>
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#ifndef CHARSET_EBCDIC
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#define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
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#define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f])
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#else
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/* We assume that PEM encoded files are EBCDIC files
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* (i.e., printable text files). Convert them here while decoding.
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* When encoding, output is EBCDIC (text) format again.
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* (No need for conversion in the conv_bin2ascii macro, as the
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* underlying textstring data_bin2ascii[] is already EBCDIC)
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*/
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#define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
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#define conv_ascii2bin(a) (data_ascii2bin[os_toascii[a]&0x7f])
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#endif
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/* 64 char lines
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* pad input with 0
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* left over chars are set to =
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* 1 byte => xx==
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* 2 bytes => xxx=
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* 3 bytes => xxxx
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*/
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#define BIN_PER_LINE (64/4*3)
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#define CHUNKS_PER_LINE (64/4)
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#define CHAR_PER_LINE (64+1)
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static const unsigned char data_bin2ascii[65]="ABCDEFGHIJKLMNOPQRSTUVWXYZ\
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abcdefghijklmnopqrstuvwxyz0123456789+/";
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/* 0xF0 is a EOLN
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* 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
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* 0xF2 is EOF
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* 0xE0 is ignore at start of line.
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* 0xFF is error
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*/
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#define B64_EOLN 0xF0
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#define B64_CR 0xF1
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#define B64_EOF 0xF2
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#define B64_WS 0xE0
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#define B64_ERROR 0xFF
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#define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
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static const unsigned char data_ascii2bin[128]={
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xE0,0xF0,0xFF,0xFF,0xF1,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0xFF,0xFF,0x3E,0xFF,0xF2,0xFF,0x3F,
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0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,
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0x3C,0x3D,0xFF,0xFF,0xFF,0x00,0xFF,0xFF,
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06,
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF,
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0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
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0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,
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0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,0x30,
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0x31,0x32,0x33,0xFF,0xFF,0xFF,0xFF,0xFF,
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};
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void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
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{
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ctx->length=48;
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ctx->num=0;
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ctx->line_num=0;
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}
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void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int i,j;
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unsigned int total=0;
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*outl=0;
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if (inl == 0) return;
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OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
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if ((ctx->num+inl) < ctx->length)
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{
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memcpy(&(ctx->enc_data[ctx->num]),in,inl);
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ctx->num+=inl;
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return;
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}
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if (ctx->num != 0)
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{
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i=ctx->length-ctx->num;
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memcpy(&(ctx->enc_data[ctx->num]),in,i);
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in+=i;
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inl-=i;
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j=EVP_EncodeBlock(out,ctx->enc_data,ctx->length);
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ctx->num=0;
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out+=j;
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*(out++)='\n';
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*out='\0';
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total=j+1;
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}
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while (inl >= ctx->length)
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{
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j=EVP_EncodeBlock(out,in,ctx->length);
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in+=ctx->length;
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inl-=ctx->length;
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out+=j;
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*(out++)='\n';
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*out='\0';
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total+=j+1;
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}
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if (inl != 0)
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memcpy(&(ctx->enc_data[0]),in,inl);
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ctx->num=inl;
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*outl=total;
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}
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void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
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{
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unsigned int ret=0;
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if (ctx->num != 0)
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{
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ret=EVP_EncodeBlock(out,ctx->enc_data,ctx->num);
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out[ret++]='\n';
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out[ret]='\0';
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ctx->num=0;
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}
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*outl=ret;
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}
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int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
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{
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int i,ret=0;
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unsigned long l;
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for (i=dlen; i > 0; i-=3)
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{
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if (i >= 3)
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{
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l= (((unsigned long)f[0])<<16L)|
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(((unsigned long)f[1])<< 8L)|f[2];
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*(t++)=conv_bin2ascii(l>>18L);
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*(t++)=conv_bin2ascii(l>>12L);
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*(t++)=conv_bin2ascii(l>> 6L);
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*(t++)=conv_bin2ascii(l );
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}
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else
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{
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l=((unsigned long)f[0])<<16L;
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if (i == 2) l|=((unsigned long)f[1]<<8L);
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*(t++)=conv_bin2ascii(l>>18L);
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*(t++)=conv_bin2ascii(l>>12L);
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*(t++)=(i == 1)?'=':conv_bin2ascii(l>> 6L);
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*(t++)='=';
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}
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ret+=4;
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f+=3;
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}
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*t='\0';
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return(ret);
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}
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void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
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{
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ctx->length=30;
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ctx->num=0;
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ctx->line_num=0;
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ctx->expect_nl=0;
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}
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/* -1 for error
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* 0 for last line
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* 1 for full line
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*/
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int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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int seof= -1,eof=0,rv= -1,ret=0,i,v,tmp,n,ln,exp_nl;
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unsigned char *d;
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n=ctx->num;
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d=ctx->enc_data;
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ln=ctx->line_num;
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exp_nl=ctx->expect_nl;
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/* last line of input. */
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if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF)))
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{ rv=0; goto end; }
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/* We parse the input data */
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for (i=0; i<inl; i++)
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{
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/* If the current line is > 80 characters, scream alot */
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if (ln >= 80) { rv= -1; goto end; }
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/* Get char and put it into the buffer */
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tmp= *(in++);
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v=conv_ascii2bin(tmp);
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/* only save the good data :-) */
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if (!B64_NOT_BASE64(v))
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{
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OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
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d[n++]=tmp;
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ln++;
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}
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else if (v == B64_ERROR)
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{
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rv= -1;
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goto end;
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}
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/* have we seen a '=' which is 'definitly' the last
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* input line. seof will point to the character that
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* holds it. and eof will hold how many characters to
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* chop off. */
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if (tmp == '=')
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{
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if (seof == -1) seof=n;
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eof++;
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}
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if (v == B64_CR)
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{
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ln = 0;
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if (exp_nl)
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continue;
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}
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/* eoln */
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if (v == B64_EOLN)
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{
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ln=0;
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if (exp_nl)
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{
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exp_nl=0;
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continue;
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}
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}
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exp_nl=0;
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/* If we are at the end of input and it looks like a
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* line, process it. */
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if (((i+1) == inl) && (((n&3) == 0) || eof))
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{
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v=B64_EOF;
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/* In case things were given us in really small
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records (so two '=' were given in separate
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updates), eof may contain the incorrect number
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of ending bytes to skip, so let's redo the count */
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eof = 0;
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if (d[n-1] == '=') eof++;
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if (d[n-2] == '=') eof++;
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/* There will never be more than two '=' */
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}
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if ((v == B64_EOF && (n&3) == 0) || (n >= 64))
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{
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/* This is needed to work correctly on 64 byte input
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* lines. We process the line and then need to
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* accept the '\n' */
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if ((v != B64_EOF) && (n >= 64)) exp_nl=1;
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if (n > 0)
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{
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v=EVP_DecodeBlock(out,d,n);
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n=0;
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if (v < 0) { rv=0; goto end; }
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ret+=(v-eof);
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}
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else
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{
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eof=1;
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v=0;
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}
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/* This is the case where we have had a short
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* but valid input line */
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if ((v < ctx->length) && eof)
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{
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rv=0;
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goto end;
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}
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else
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ctx->length=v;
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if (seof >= 0) { rv=0; goto end; }
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out+=v;
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}
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}
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rv=1;
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end:
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*outl=ret;
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ctx->num=n;
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ctx->line_num=ln;
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ctx->expect_nl=exp_nl;
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return(rv);
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}
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int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
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{
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int i,ret=0,a,b,c,d;
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unsigned long l;
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/* trim white space from the start of the line. */
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while ((conv_ascii2bin(*f) == B64_WS) && (n > 0))
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{
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f++;
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n--;
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}
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/* strip off stuff at the end of the line
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* ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
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while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n-1]))))
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n--;
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if (n%4 != 0) return(-1);
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for (i=0; i<n; i+=4)
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{
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a=conv_ascii2bin(*(f++));
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b=conv_ascii2bin(*(f++));
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c=conv_ascii2bin(*(f++));
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d=conv_ascii2bin(*(f++));
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if ( (a & 0x80) || (b & 0x80) ||
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(c & 0x80) || (d & 0x80))
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return(-1);
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l=( (((unsigned long)a)<<18L)|
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(((unsigned long)b)<<12L)|
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(((unsigned long)c)<< 6L)|
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(((unsigned long)d) ));
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*(t++)=(unsigned char)(l>>16L)&0xff;
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*(t++)=(unsigned char)(l>> 8L)&0xff;
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*(t++)=(unsigned char)(l )&0xff;
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ret+=3;
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}
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return(ret);
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}
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int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
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{
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int i;
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*outl=0;
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if (ctx->num != 0)
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{
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i=EVP_DecodeBlock(out,ctx->enc_data,ctx->num);
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if (i < 0) return(-1);
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ctx->num=0;
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*outl=i;
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return(1);
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}
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else
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return(1);
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}
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#ifdef undef
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int EVP_DecodeValid(unsigned char *buf, int len)
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{
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int i,num=0,bad=0;
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if (len == 0) return(-1);
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while (conv_ascii2bin(*buf) == B64_WS)
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{
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buf++;
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len--;
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if (len == 0) return(-1);
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}
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for (i=len; i >= 4; i-=4)
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{
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if ( (conv_ascii2bin(buf[0]) >= 0x40) ||
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(conv_ascii2bin(buf[1]) >= 0x40) ||
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(conv_ascii2bin(buf[2]) >= 0x40) ||
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(conv_ascii2bin(buf[3]) >= 0x40))
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return(-1);
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buf+=4;
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num+=1+(buf[2] != '=')+(buf[3] != '=');
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}
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if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
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return(num);
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if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
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(conv_ascii2bin(buf[0]) == B64_EOLN))
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return(num);
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return(1);
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}
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#endif
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