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