/* armor.c - Armor flter * Copyright (C) 1998, 1999 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG 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. * * GnuPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include #include #include #include #include #include #include #include "errors.h" #include "iobuf.h" #include "memory.h" #include "util.h" #include "iobuf.h" #include "filter.h" #include "packet.h" #include "options.h" #include "main.h" #include "status.h" #include "i18n.h" #define MAX_LINELEN 20000 #define CRCINIT 0xB704CE #define CRCPOLY 0X864CFB #define CRCUPDATE(a,c) do { \ a = ((a) << 8) ^ crc_table[((a)&0xff >> 16) ^ (c)]; \ a &= 0x00ffffff; \ } while(0) static u32 crc_table[256]; static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789+/"; static byte asctobin[256]; /* runtime initialized */ static int is_initialized; typedef enum { fhdrHASArmor = 0, fhdrNOArmor, fhdrINIT, fhdrINITCont, fhdrINITSkip, fhdrCHECKBegin, fhdrWAITHeader, fhdrWAITClearsig, fhdrSKIPHeader, fhdrCLEARSIG, fhdrREADClearsig, fhdrNullClearsig, fhdrEMPTYClearsig, fhdrCHECKClearsig, fhdrCHECKClearsig2, fhdrCHECKDashEscaped, fhdrCHECKDashEscaped2, fhdrCHECKDashEscaped3, fhdrREADClearsigNext, fhdrENDClearsig, fhdrENDClearsigHelp, fhdrTESTSpaces, fhdrCLEARSIGSimple, fhdrCLEARSIGSimpleNext, fhdrTEXT, fhdrTEXTSimple, fhdrERROR, fhdrERRORShow, fhdrEOF } fhdr_state_t; /* if we encounter this armor string with this index, go * into a mode which fakes packets and wait for the next armor */ #define BEGIN_SIGNATURE 2 #define BEGIN_SIGNED_MSG_IDX 3 static char *head_strings[] = { "BEGIN PGP MESSAGE", "BEGIN PGP PUBLIC KEY BLOCK", "BEGIN PGP SIGNATURE", "BEGIN PGP SIGNED MESSAGE", "BEGIN PGP ARMORED FILE", /* gnupg extension */ "BEGIN PGP PRIVATE KEY BLOCK", "BEGIN PGP SECRET KEY BLOCK", /* only used by pgp2 */ NULL }; static char *tail_strings[] = { "END PGP MESSAGE", "END PGP PUBLIC KEY BLOCK", "END PGP SIGNATURE", "END dummy", "END PGP ARMORED FILE", "END PGP PRIVATE KEY BLOCK", "END PGP SECRET KEY BLOCK", NULL }; static void initialize(void) { int i, j; u32 t; byte *s; /* init the crc lookup table */ crc_table[0] = 0; for(i=j=0; j < 128; j++ ) { t = crc_table[j]; if( t & 0x00800000 ) { t <<= 1; crc_table[i++] = t ^ CRCPOLY; crc_table[i++] = t; } else { t <<= 1; crc_table[i++] = t; crc_table[i++] = t ^ CRCPOLY; } } /* build the helptable for radix64 to bin conversion */ for(i=0; i < 256; i++ ) asctobin[i] = 255; /* used to detect invalid characters */ for(s=bintoasc,i=0; *s; s++,i++ ) asctobin[*s] = i; is_initialized=1; } /**************** * Check whether this is an armored file or not * See also parse-packet.c for details on this code * Returns: True if it seems to be armored */ static int is_armored( const byte *buf ) { int ctb, pkttype; ctb = *buf; if( !(ctb & 0x80) ) return 1; /* invalid packet: assume it is armored */ pkttype = ctb & 0x40 ? (ctb & 0x3f) : ((ctb>>2)&0xf); switch( pkttype ) { case PKT_MARKER: case PKT_SYMKEY_ENC: case PKT_PUBLIC_KEY: case PKT_SECRET_KEY: case PKT_PUBKEY_ENC: case PKT_SIGNATURE: case PKT_COMMENT: case PKT_OLD_COMMENT: case PKT_PLAINTEXT: case PKT_COMPRESSED: case PKT_ENCRYPTED: return 0; /* seems to be a regular packet: not armored */ } return 1; } /**************** * Try to check whether the iobuf is armored * Returns true if this may be the case; the caller should use the * filter to do further processing. */ int use_armor_filter( IOBUF a ) { byte buf[1]; int n; n = iobuf_peek(a, buf, 1 ); if( n == -1 ) return 0; /* EOF, doesn't matter whether armored or not */ if( !n ) return 1; /* can't check it: try armored */ return is_armored(buf); } static void invalid_armor(void) { write_status(STATUS_BADARMOR); g10_exit(1); /* stop here */ } /**************** * check whether the armor header is valid on a signed message. * this is for security reasons: the header lines are not included in the * hash and by using some creative formatting rules, Mallory could fake * any text at the beginning of a document; assuming it is read with * a simple viewer. We only allow the Hash Header. */ static int parse_hash_header( const char *line ) { const char *s, *s2; unsigned found = 0; if( strlen(line) < 6 || strlen(line) > 60 ) return 0; /* too short or too long */ if( memcmp( line, "Hash:", 5 ) ) return 0; /* invalid header */ s = line+5; for(s=line+5;;s=s2) { for(; *s && (*s==' ' || *s == '\t'); s++ ) ; if( !*s ) break; for(s2=s+1; *s2 && *s2!=' ' && *s2 != '\t' && *s2 != ','; s2++ ) ; if( !strncmp( s, "RIPEMD160", s2-s ) ) found |= 1; else if( !strncmp( s, "SHA1", s2-s ) ) found |= 2; else if( !strncmp( s, "MD5", s2-s ) ) found |= 4; else if( !strncmp( s, "TIGER", s2-s ) ) found |= 8; else return 0; for(; *s2 && (*s2==' ' || *s2 == '\t'); s2++ ) ; if( *s2 && *s2 != ',' ) return 0; if( *s2 ) s2++; } return found; } /**************** * Check whether this is a armor line. * returns: -1 if it is not a armor header or the index number of the * armor header. */ static int is_armor_header( byte *line, unsigned len ) { const char *s; byte *save_p, *p; int save_c; int i; if( len < 15 ) return -1; /* too short */ if( memcmp( line, "-----", 5 ) ) return -1; /* no */ p = strstr( line+5, "-----"); if( !p ) return -1; save_p = p; p += 5; if( *p == '\r' ) p++; if( *p == '\n' ) p++; if( *p ) return -1; /* garbage after dashes */ save_c = *save_p; *save_p = 0; p = line+5; for(i=0; (s=head_strings[i]); i++ ) if( !strcmp(s, p) ) break; *save_p = save_c; if( !s ) return -1; /* unknown armor line */ if( opt.verbose > 1 ) log_info(_("armor: %s\n"), head_strings[i]); return i; } /**************** * Parse a header lines * Return 0: Empty line (end of header lines) * -1: invalid header line * >0: Good header line */ static int parse_header_line( armor_filter_context_t *afx, byte *line, unsigned len ) { byte *p; int hashes=0; if( *line == '\n' || ( len && (*line == '\r' && line[1]=='\n') ) ) return 0; /* empty line */ len = trim_trailing_ws( line, len ); p = strchr( line, ':'); if( !p || !p[1] ) { log_error(_("invalid armor header: ")); print_string( stderr, line, len, 0 ); putc('\n', stderr); return -1; } if( opt.verbose ) { log_info(_("armor header: ")); print_string( stderr, line, len, 0 ); putc('\n', stderr); } if( afx->in_cleartext ) { if( (hashes=parse_hash_header( line )) ) afx->hashes |= hashes; else if( strlen(line) > 15 && !memcmp( line, "NotDashEscaped:", 15 ) ) afx->not_dash_escaped = 1; else { log_error(_("invalid clearsig header\n")); return -1; } } return 1; } /* figure out whether the data is armored or not */ static int check_input( armor_filter_context_t *afx, IOBUF a ) { int rc = 0; int i; byte *line; unsigned len; unsigned maxlen; int hdr_line = -1; /* read the first line to see whether this is armored data */ maxlen = MAX_LINELEN; len = afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); line = afx->buffer; if( !maxlen ) { /* line has been truncated: assume not armored */ afx->inp_checked = 1; afx->inp_bypass = 1; return 0; } if( !len ) { return -1; /* eof */ } /* (the line is always a C string but maybe longer) */ if( *line == '\n' || ( len && (*line == '\r' && line[1]=='\n') ) ) ; else if( !is_armored( line ) ) { afx->inp_checked = 1; afx->inp_bypass = 1; return 0; } /* find the armor header */ while(len) { i = is_armor_header( line, len ); if( i >= 0 && !(afx->only_keyblocks && i != 1 && i != 5 && i != 6 )) { hdr_line = i; if( hdr_line == BEGIN_SIGNED_MSG_IDX ) { if( afx->in_cleartext ) { log_error(_("nested clear text signatures\n")); rc = G10ERR_INVALID_ARMOR; } afx->in_cleartext = 1; } break; } /* read the next line (skip all truncated lines) */ do { maxlen = MAX_LINELEN; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); line = afx->buffer; len = afx->buffer_len; } while( !maxlen ); } /* parse the header lines */ while(len) { /* read the next line (skip all truncated lines) */ do { maxlen = MAX_LINELEN; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); line = afx->buffer; len = afx->buffer_len; } while( !maxlen ); i = parse_header_line( afx, line, len ); if( i <= 0 ) { if( i ) rc = G10ERR_INVALID_ARMOR; break; } } if( rc ) invalid_armor(); else if( afx->in_cleartext ) { afx->faked = 1; } else { afx->inp_checked = 1; afx->crc = CRCINIT; afx->idx = 0; afx->radbuf[0] = 0; } return rc; } /**************** * Fake a literal data packet and wait for the next armor line * fixme: empty line handling and null length clear text signature are * not implemented/checked. */ static int fake_packet( armor_filter_context_t *afx, IOBUF a, size_t *retn, byte *buf, size_t size ) { int rc = 0; size_t len = 0; unsigned emplines = afx->empty; int lastline = 0; unsigned maxlen, n; byte *p; len = 2; /* reserve 2 bytes for the length header */ size -= 3; /* and 1 for empline handling and 2 for the term header */ /* or the appended CR,LF */ while( !rc && len < size ) { if( emplines ) { while( emplines && len < size ) { buf[len++] = '\r'; buf[len++] = '\n'; emplines--; } continue; } if( afx->faked == 1 ) afx->faked++; /* skip the first (empty) line */ else { while( len < size && afx->buffer_pos < afx->buffer_len ) buf[len++] = afx->buffer[afx->buffer_pos++]; if( afx->buffer_pos >= afx->buffer_len && !afx->not_dash_escaped ) { buf[len++] = '\r'; buf[len++] = '\n'; } if( len >= size ) continue; } /* read the next line */ maxlen = MAX_LINELEN; afx->buffer_pos = 0; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); if( !afx->buffer_len ) { rc = -1; /* eof */ continue; } if( !maxlen ) afx->truncated++; if( !afx->not_dash_escaped ) afx->buffer_len = trim_trailing_ws( afx->buffer, afx->buffer_len ); p = afx->buffer; n = afx->buffer_len; if( n > 2 && *p == '-' ) { /* check for dash escaped or armor header */ if( p[1] == ' ' && !afx->not_dash_escaped ) { /* issue a warning if it is not regular encoded */ if( p[2] != '-' && !( n > 6 && !memcmp(p+2, "From ", 5))) { log_info(_("invalid dash escaped line: ")); print_string( stderr, p, n, 0 ); putc('\n', stderr); } afx->buffer_pos = 2; /* skip */ } else if( n >= 15 && p[1] == '-' && p[2] == '-' && p[3] == '-' ) { if( is_armor_header( p, n ) != BEGIN_SIGNATURE ) { log_info(_("unexpected armor:")); print_string( stderr, p, n, 0 ); putc('\n', stderr); } lastline = 1; rc = -1; } } } buf[0] = (len-2) >> 8; buf[1] = (len-2); if( lastline ) { /* write last (ending) length header */ if( buf[0] || buf[1] ) { /* only if we have some text */ buf[len++] = 0; buf[len++] = 0; } rc = 0; afx->faked = 0; afx->in_cleartext = 0; /* and now read the header lines */ afx->buffer_pos = 0; for(;;) { int i; /* read the next line (skip all truncated lines) */ do { maxlen = MAX_LINELEN; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); } while( !maxlen ); p = afx->buffer; n = afx->buffer_len; if( !n ) { rc = -1; break; /* eof */ } i = parse_header_line( afx, p , n ); if( i <= 0 ) { if( i ) invalid_armor(); break; } } afx->inp_checked = 1; afx->crc = CRCINIT; afx->idx = 0; afx->radbuf[0] = 0; } afx->empty = emplines; *retn = len; return rc; } static int radix64_read( armor_filter_context_t *afx, IOBUF a, size_t *retn, byte *buf, size_t size ) { byte val; int c=0, c2; /*init c because gcc is not clever enough for the continue*/ int checkcrc=0; int rc = 0; size_t n = 0; int idx, i; u32 crc; crc = afx->crc; idx = afx->idx; val = afx->radbuf[0]; for( n=0; n < size; ) { if( afx->buffer_pos < afx->buffer_len ) c = afx->buffer[afx->buffer_pos++]; else { /* read the next line */ unsigned maxlen = MAX_LINELEN; afx->buffer_pos = 0; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); if( !maxlen ) afx->truncated++; if( !afx->buffer_len ) break; /* eof */ continue; } again: if( c == '\n' || c == ' ' || c == '\r' || c == '\t' ) continue; else if( c == '=' ) { /* pad character: stop */ /* some mailers leave quoted-printable encoded characters * so we try to workaround this */ if( afx->buffer_pos+2 < afx->buffer_len ) { int c1, c2, c3; c1 = afx->buffer[afx->buffer_pos]; c2 = afx->buffer[afx->buffer_pos+1]; c3 = afx->buffer[afx->buffer_pos+2]; if( isxdigit(c1) && isxdigit(c2) && strchr( "=\n\r\t ", c3 )) { /* well it seems to be the case - adjust */ c = isdigit(c1)? (c1 - '0'): (toupper(c1)-'A'+10); c <<= 4; c |= isdigit(c2)? (c2 - '0'): (toupper(c2)-'A'+10); afx->buffer_pos += 2; afx->qp_detected = 1; goto again; } } if( idx == 1 ) buf[n++] = val; checkcrc++; break; } else if( (c = asctobin[(c2=c)]) == 255 ) { log_error(_("invalid radix64 character %02x skipped\n"), c2); continue; } switch(idx) { case 0: val = c << 2; break; case 1: val |= (c>>4)&3; buf[n++]=val;val=(c<<4)&0xf0;break; case 2: val |= (c>>2)&15; buf[n++]=val;val=(c<<6)&0xc0;break; case 3: val |= c&0x3f; buf[n++] = val; break; } idx = (idx+1) % 4; } for(i=0; i < n; i++ ) crc = (crc << 8) ^ crc_table[((crc >> 16)&0xff) ^ buf[i]]; crc &= 0x00ffffff; afx->crc = crc; afx->idx = idx; afx->radbuf[0] = val; if( checkcrc ) { afx->any_data = 1; afx->inp_checked=0; afx->faked = 0; for(;;) { /* skip lf and pad characters */ if( afx->buffer_pos < afx->buffer_len ) c = afx->buffer[afx->buffer_pos++]; else { /* read the next line */ unsigned maxlen = MAX_LINELEN; afx->buffer_pos = 0; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); if( !maxlen ) afx->truncated++; if( !afx->buffer_len ) break; /* eof */ continue; } if( c == '\n' || c == ' ' || c == '\r' || c == '\t' || c == '=' ) continue; break; } if( c == -1 ) log_error(_("premature eof (no CRC)\n")); else { u32 mycrc = 0; idx = 0; do { if( (c = asctobin[c]) == 255 ) break; switch(idx) { case 0: val = c << 2; break; case 1: val |= (c>>4)&3; mycrc |= val << 16;val=(c<<4)&0xf0;break; case 2: val |= (c>>2)&15; mycrc |= val << 8;val=(c<<6)&0xc0;break; case 3: val |= c&0x3f; mycrc |= val; break; } for(;;) { if( afx->buffer_pos < afx->buffer_len ) c = afx->buffer[afx->buffer_pos++]; else { /* read the next line */ unsigned maxlen = MAX_LINELEN; afx->buffer_pos = 0; afx->buffer_len = iobuf_read_line( a, &afx->buffer, &afx->buffer_size, &maxlen ); if( !maxlen ) afx->truncated++; if( !afx->buffer_len ) break; /* eof */ continue; } break; } if( !afx->buffer_len ) break; /* eof */ } while( ++idx < 4 ); if( c == -1 ) { log_error(_("premature eof (in CRC)\n")); rc = G10ERR_INVALID_ARMOR; } else if( idx != 4 ) { log_error(_("malformed CRC\n")); rc = G10ERR_INVALID_ARMOR; } else if( mycrc != afx->crc ) { log_error(_("CRC error; %06lx - %06lx\n"), (ulong)afx->crc, (ulong)mycrc); rc = G10ERR_INVALID_ARMOR; } else { rc = 0; #if 0 for(rc=0;!rc;) { rc = 0 /*check_trailer( &fhdr, c )*/; if( !rc ) { if( (c=iobuf_get(a)) == -1 ) rc = 2; } } if( rc == -1 ) rc = 0; else if( rc == 2 ) { log_error(_("premature eof (in Trailer)\n")); rc = G10ERR_INVALID_ARMOR; } else { log_error(_("error in trailer line\n")); rc = G10ERR_INVALID_ARMOR; } #endif } } } if( !n ) rc = -1; *retn = n; return rc; } /**************** * This filter is used to handle the armor stuff */ int armor_filter( void *opaque, int control, IOBUF a, byte *buf, size_t *ret_len) { size_t size = *ret_len; armor_filter_context_t *afx = opaque; int rc=0, i, c; byte radbuf[3]; int idx, idx2; size_t n=0; u32 crc; #if 0 static FILE *fp ; if( !fp ) { fp = fopen("armor.out", "w"); assert(fp); } #endif if( DBG_FILTER ) log_debug("armor-filter: control: %d\n", control ); if( control == IOBUFCTRL_UNDERFLOW && afx->inp_bypass ) { n = 0; if( afx->buffer_len ) { for(; n < size && afx->buffer_pos < afx->buffer_len; n++ ) buf[n++] = afx->buffer[afx->buffer_pos++]; if( afx->buffer_pos >= afx->buffer_len ) afx->buffer_len = 0; } for(; n < size; n++ ) { if( (c=iobuf_get(a)) == -1 ) break; buf[n] = c & 0xff; } if( !n ) rc = -1; *ret_len = n; } else if( control == IOBUFCTRL_UNDERFLOW ) { if( size < 15+(4*15) ) /* need space for up to 4 onepass_sigs */ BUG(); /* supplied buffer too short */ if( afx->faked ) rc = fake_packet( afx, a, &n, buf, size ); else if( !afx->inp_checked ) { rc = check_input( afx, a ); if( afx->inp_bypass ) { for(n=0; n < size && afx->buffer_pos < afx->buffer_len; n++ ) buf[n++] = afx->buffer[afx->buffer_pos++]; if( afx->buffer_pos >= afx->buffer_len ) afx->buffer_len = 0; if( !n ) rc = -1; } else if( afx->faked ) { unsigned hashes = afx->hashes; /* the buffer is at least 15+n*15 bytes long, so it * is easy to construct the packets */ hashes &= 1|2|4|8; if( !hashes ) hashes |= 4; /* default to MD 5 */ n=0; do { /* first some onepass signature packets */ buf[n++] = 0x90; /* old format, type 4, 1 length byte */ buf[n++] = 13; /* length */ buf[n++] = 3; /* version */ buf[n++] = 0x01; /* sigclass 0x01 (canonical text mode)*/ if( hashes & 1 ) { hashes &= ~1; buf[n++] = DIGEST_ALGO_RMD160; } else if( hashes & 2 ) { hashes &= ~2; buf[n++] = DIGEST_ALGO_SHA1; } else if( hashes & 4 ) { hashes &= ~4; buf[n++] = DIGEST_ALGO_MD5; } else if( hashes & 8 ) { hashes &= ~8; buf[n++] = DIGEST_ALGO_TIGER; } else buf[n++] = 0; /* (don't know) */ buf[n++] = 0; /* public key algo (don't know) */ memset(buf+n, 0, 8); /* don't know the keyid */ n += 8; buf[n++] = !hashes; /* last one */ } while( hashes ); /* followed by a plaintext packet */ buf[n++] = 0xaf; /* old packet format, type 11, var length */ buf[n++] = 0; /* set the length header */ buf[n++] = 6; buf[n++] = 't'; /* canonical text mode */ buf[n++] = 0; /* namelength */ memset(buf+n, 0, 4); /* timestamp */ n += 4; } else if( !rc ) rc = radix64_read( afx, a, &n, buf, size ); } else rc = radix64_read( afx, a, &n, buf, size ); #if 0 if( n ) if( fwrite(buf, n, 1, fp ) != 1 ) BUG(); #endif *ret_len = n; } else if( control == IOBUFCTRL_FLUSH ) { if( !afx->status ) { /* write the header line */ if( afx->what >= DIM(head_strings) ) log_bug("afx->what=%d", afx->what); iobuf_writestr(a, "-----"); iobuf_writestr(a, head_strings[afx->what] ); iobuf_writestr(a, "-----\n"); if( !opt.no_version ) iobuf_writestr(a, "Version: GnuPG v" VERSION " (" PRINTABLE_OS_NAME ")\n"); if( opt.comment_string ) { const char *s = opt.comment_string; if( *s ) { iobuf_writestr(a, "Comment: " ); for( ; *s; s++ ) { if( *s == '\n' ) iobuf_writestr(a, "\\n" ); else if( *s == '\r' ) iobuf_writestr(a, "\\r" ); else if( *s == '\v' ) iobuf_writestr(a, "\\v" ); else iobuf_put(a, *s ); } iobuf_put(a, '\n' ); } } else iobuf_writestr(a, "Comment: For info see http://www.gnupg.org\n"); if( afx->hdrlines ) iobuf_writestr(a, afx->hdrlines); iobuf_put(a, '\n'); afx->status++; afx->idx = 0; afx->idx2 = 0; afx->crc = CRCINIT; } crc = afx->crc; idx = afx->idx; idx2 = afx->idx2; for(i=0; i < idx; i++ ) radbuf[i] = afx->radbuf[i]; for(i=0; i < size; i++ ) crc = (crc << 8) ^ crc_table[((crc >> 16)&0xff) ^ buf[i]]; crc &= 0x00ffffff; for( ; size; buf++, size-- ) { radbuf[idx++] = *buf; if( idx > 2 ) { idx = 0; c = bintoasc[(*radbuf >> 2) & 077]; iobuf_put(a, c); c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077]; iobuf_put(a, c); c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077]; iobuf_put(a, c); c = bintoasc[radbuf[2]&077]; iobuf_put(a, c); if( ++idx2 >= (64/4) ) { /* pgp doesn't like 72 here */ iobuf_put(a, '\n'); idx2=0; } } } for(i=0; i < idx; i++ ) afx->radbuf[i] = radbuf[i]; afx->idx = idx; afx->idx2 = idx2; afx->crc = crc; } else if( control == IOBUFCTRL_INIT ) { if( !is_initialized ) initialize(); } else if( control == IOBUFCTRL_FREE ) { if( afx->status ) { /* pad, write cecksum, and bottom line */ crc = afx->crc; idx = afx->idx; idx2 = afx->idx2; for(i=0; i < idx; i++ ) radbuf[i] = afx->radbuf[i]; if( idx ) { c = bintoasc[(*radbuf>>2)&077]; iobuf_put(a, c); if( idx == 1 ) { c = bintoasc[((*radbuf << 4) & 060) & 077]; iobuf_put(a, c); iobuf_put(a, '='); iobuf_put(a, '='); } else { /* 2 */ c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077]; iobuf_put(a, c); c = bintoasc[((radbuf[1] << 2) & 074) & 077]; iobuf_put(a, c); iobuf_put(a, '='); } if( ++idx2 >= (64/4) ) { /* pgp doesn't like 72 here */ iobuf_put(a, '\n'); idx2=0; } } /* may need a linefeed */ if( idx2 ) iobuf_put(a, '\n'); /* write the CRC */ iobuf_put(a, '='); radbuf[0] = crc >>16; radbuf[1] = crc >> 8; radbuf[2] = crc; c = bintoasc[(*radbuf >> 2) & 077]; iobuf_put(a, c); c = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077]; iobuf_put(a, c); c = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077]; iobuf_put(a, c); c = bintoasc[radbuf[2]&077]; iobuf_put(a, c); iobuf_put(a, '\n'); /* and the the trailer */ if( afx->what >= DIM(tail_strings) ) log_bug("afx->what=%d", afx->what); iobuf_writestr(a, "-----"); iobuf_writestr(a, tail_strings[afx->what] ); iobuf_writestr(a, "-----\n"); } else if( !afx->any_data && !afx->inp_bypass ) log_error(_("no valid OpenPGP data found.\n")); if( afx->truncated ) log_info(_("invalid armor: line longer than %d characters\n"), MAX_LINELEN ); /* issue an error to enforce dissemination of correct software */ if( afx->qp_detected ) log_error(_("quoted printable character in armor - " "probably a buggy MTA has been used\n") ); m_free( afx->buffer ); afx->buffer = NULL; } else if( control == IOBUFCTRL_DESC ) *(char**)buf = "armor_filter"; return rc; }