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* pkclist.c (do_we_trust_pre): Changed the wording of a warning.

Browse source 
* encode.c (encode_simple,encode_crypt): Use new style CTB for
compressssed packets when using MDC.  We need to do this so that
concatenated messages are properly decrypted.  Old style
compression assumes that it is the last packet; given that we
can't determine the length in advance, the uncompressor does not
know where to start.  Actually we should use the new CTB always
but this would break PGP 2 compatibility.
* parse-packet.c (parse): Special treatment for new style CTB
compressed packets.

* build-packet.c (do_mdc): Removed. Was not used.
(do_encrypted_mdc): Count the version number and the MDC packet.
This commit is contained in:
Werner Koch 2002-08-30 16:34:13 +00:00
parent 0073d6865d
commit 5dfd5a6dac
7 changed files with 82 additions and 59 deletions
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76
g10/parse-packet.c
View file

@ -318,39 +318,47 @@ parse( IOBUF inp, PACKET *pkt, int onlykeypkts, off_t *retpos,
pktlen = 0;
new_ctb = !!(ctb & 0x40);
if( new_ctb ) {
pkttype = ctb & 0x3f;
pkttype = ctb & 0x3f;
if( (c = iobuf_get(inp)) == -1 ) {
log_error("%s: 1st length byte missing\n", iobuf_where(inp) );
rc = G10ERR_INVALID_PACKET;
goto leave;
}
hdr[hdrlen++] = c;
if( c < 192 )
pktlen = c;
else if( c < 224 ) {
pktlen = (c - 192) * 256;
if( (c = iobuf_get(inp)) == -1 ) {
log_error("%s: 2nd length byte missing\n", iobuf_where(inp) );
rc = G10ERR_INVALID_PACKET;
goto leave;
}
hdr[hdrlen++] = c;
pktlen += c + 192;
}
else if( c == 255 ) {
pktlen = (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 24;
pktlen |= (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 16;
pktlen |= (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 8;
if( (c = iobuf_get(inp)) == -1 ) {
log_error("%s: 4 byte length invalid\n", iobuf_where(inp) );
rc = G10ERR_INVALID_PACKET;
goto leave;
}
pktlen |= (hdr[hdrlen++] = c );
}
else { /* partial body length */
iobuf_set_partial_block_mode(inp, c & 0xff);
pktlen = 0;/* to indicate partial length */
if (pkttype == PKT_COMPRESSED) {
iobuf_set_partial_block_mode(inp, c & 0xff);
pktlen = 0;/* to indicate partial length */
}
else {
hdr[hdrlen++] = c;
if( c < 192 )
pktlen = c;
else if( c < 224 ) {
pktlen = (c - 192) * 256;
if( (c = iobuf_get(inp)) == -1 ) {
log_error("%s: 2nd length byte missing\n",
iobuf_where(inp) );
rc = G10ERR_INVALID_PACKET;
goto leave;
}
hdr[hdrlen++] = c;
pktlen += c + 192;
}
else if( c == 255 ) {
pktlen = (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 24;
pktlen |= (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 16;
pktlen |= (hdr[hdrlen++] = iobuf_get_noeof(inp)) << 8;
if( (c = iobuf_get(inp)) == -1 ) {
log_error("%s: 4 byte length invalid\n",
iobuf_where(inp) );
rc = G10ERR_INVALID_PACKET;
goto leave;
}
pktlen |= (hdr[hdrlen++] = c );
}
else { /* partial body length */
iobuf_set_partial_block_mode(inp, c & 0xff);
pktlen = 0;/* to indicate partial length */
}
}
}
else {
@ -400,14 +408,14 @@ parse( IOBUF inp, PACKET *pkt, int onlykeypkts, off_t *retpos,
}
if( DBG_PACKET ) {
#ifdef DEBUG_PARSE_PACKET
#ifdef DEBUG_PARSE_PACKET
log_debug("parse_packet(iob=%d): type=%d length=%lu%s (%s.%s.%d)\n",
iobuf_id(inp), pkttype, pktlen, new_ctb?" (new_ctb)":"",
dbg_w, dbg_f, dbg_l );
#else
#else
log_debug("parse_packet(iob=%d): type=%d length=%lu%s\n",
iobuf_id(inp), pkttype, pktlen, new_ctb?" (new_ctb)":"" );
#endif
#endif
}
pkt->pkttype = pkttype;
rc = G10ERR_UNKNOWN_PACKET; /* default error */
@ -2014,8 +2022,8 @@ parse_compressed( IOBUF inp, int pkttype, unsigned long pktlen,
* the compress algorithm should know the length)
*/
zd = pkt->pkt.compressed = m_alloc(sizeof *pkt->pkt.compressed );
zd->len = 0; /* not yet used */
zd->algorithm = iobuf_get_noeof(inp);
zd->len = 0; /* not used */
zd->new_ctb = new_ctb;
zd->buf = inp;
if( list_mode )
@ -2036,8 +2044,8 @@ parse_encrypted( IOBUF inp, int pkttype, unsigned long pktlen,
ed->len = pktlen;
/* we don't know the extralen which is (cipher_blocksize+2)
because the algorithm ist not specified in this packet.
However, it is only important to know this for somesanity
checks on the pkacet length - it doesn't matter that we can't
However, it is only important to know this for some sanity
checks on the packet length - it doesn't matter that we can't
do it */
ed->extralen = 0;
ed->buf = NULL;