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Octocat-spinner-32-eaf2f5

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/*
* tagfunc.c
*/

#include "pgpdump.h"

#define SYM_ALG_MODE_NOT_SPECIFIED 1
#define SYM_ALG_MODE_SYM_ENC 2
#define SYM_ALG_MODE_PUB_ENC 3

private int sym_alg_mode = SYM_ALG_MODE_NOT_SPECIFIED;
private void reset_sym_alg_mode();
private void set_sym_alg_mode(int);
private int get_sym_alg_mode();

private void
reset_sym_alg_mode()
{
sym_alg_mode = SYM_ALG_MODE_NOT_SPECIFIED;
}

private void
set_sym_alg_mode(int mode)
{
sym_alg_mode = mode;
}

private int
get_sym_alg_mode()
{
return sym_alg_mode;
}

public void
Reserved(int len)
{
skip(len);
}

public void
Public_Key_Encrypted_Session_Key_Packet(int len)
{
int pub;
ver(2, 3, Getc());
key_id();
pub = Getc();
pub_algs(pub);
switch (pub) {
case 1:
case 2:
case 3:
multi_precision_integer("RSA m^e mod n");
break;
case 16:
case 20:
multi_precision_integer("ElGamal g^k mod p");
multi_precision_integer("ElGamal m * y^k mod p");
break;
case 17:
multi_precision_integer("DSA ?");
multi_precision_integer("DSA ?");
break;
default:
printf("\t\tunknown(pub %d)\n", pub);
skip(len - 10);
}
printf("\t\t-> m = sym alg(1 byte) + checksum(2 bytes) + PKCS-1 block type 02\n");
set_sym_alg_mode(SYM_ALG_MODE_PUB_ENC);
}

public void
Symmetric_Key_Encrypted_Session_Key_Packet(int len)
{
int left = len, alg;
ver(NULL_VER, 4, Getc());
alg = Getc();
sym_algs(alg);
left -= 2;
Getc_resetlen();
string_to_key();
left -= Getc_getlen();
if (left != 0) {
printf("\tEncrypted session key\n");
printf("\t\t-> sym alg(1 bytes) + session key\n");
skip(left);
}
set_sym_alg_mode(SYM_ALG_MODE_SYM_ENC);
}

public void
Symmetrically_Encrypted_Data_Packet(int len)
{
int mode = get_sym_alg_mode();
switch (mode) {
case SYM_ALG_MODE_NOT_SPECIFIED:
printf("\tEncrypted data [sym alg is IDEA, simple string-to-key]\n");
break;
case SYM_ALG_MODE_SYM_ENC:
printf("\tEncrypted data [sym alg is specified in sym-key encrypted session key]\n");
break;
case SYM_ALG_MODE_PUB_ENC:
printf("\tEncrypted data [sym alg is specified in pub-key encrypted session key]\n");
break;
}
skip(len);
reset_sym_alg_mode();
}

public void
Marker_Packet(int len)
{
printf("\tString - ");
if (mflag) {
pdump(len);
} else {
printf("...");
skip(len);
}
printf("\n");
}

public void
Literal_Data_Packet(int len)
{
int format, flen, blen;

format = Getc();
printf("\tFormat - ");
switch (format) {
case 'b':
printf("binary");
break;
case 't':
printf("text");
break;
case 'u':
printf("UTF-8 text");
break;
case 'l':
/* RFC 1991 incorrectly define this as '1' */
printf("local");
break;
default:
printf("unknown");
}
printf("\n");
flen = Getc();
printf("\tFilename - ");
pdump(flen);
printf("\n");
time4("File modified time");
blen = len - 6 - flen;
printf("\tLiteral - ");
if (lflag) {
pdump(blen);
} else {
printf("...");
skip(blen);
}
printf("\n");
}

public void
Trust_Packet(int len)
{
printf("\tTrust - ");
dump(len);
printf("\n");
}

public void
User_ID_Packet(int len)
{
printf("\tUser ID - ");
pdump(len);
printf("\n");
}

public void
User_Attribute_Packet(int len)
{
parse_userattr_subpacket("Sub", len);
}

public void
Symmetrically_Encrypted_and_MDC_Packet(int len)
{
int mode = get_sym_alg_mode();
printf("\tVer %d\n", Getc());
switch (mode) {
case SYM_ALG_MODE_SYM_ENC:
printf("\tEncrypted data [sym alg is specified in sym-key encrypted session key]\n");
break;
case SYM_ALG_MODE_PUB_ENC:
printf("\tEncrypted data [sym alg is specified in pub-key encrypted session key]\n");
break;
}
printf("\t\t(plain text + MDC SHA1(20 bytes))\n");
skip(len - 1);
reset_sym_alg_mode();
}

/* this function is not used because this packet appears only
in encrypted packets. */
public void
Modification_Detection_Code_Packet(int len)
{
printf("\tMDC - SHA1(20 bytes)\n");
skip(len);
}

public void
Private_Packet(int len)
{
printf("\tPrivate - ");
if (pflag) {
dump(len);
} else {
printf("...");
skip(len);
}
printf("\n");
}

/*
* Copyright (C) 1998 Kazuhiko Yamamoto
* All rights reserved.
*
* 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 above 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. Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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.
*/
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