/* 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 #include "cryptlib.h" #include #define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f]) #define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f]) /* 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 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>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