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/*
* signature.c
*/
#include "pgpdump.h"
private void hash2(void);
private void signature_multi_precision_integer(int, int);
private void signature_type(int);
private void new_Signature_Packet(int);
private void old_Signature_Packet(int);
private void
hash2(void)
{
printf("\tHash left 2 bytes - ");
dump(2);
printf("\n");
}
/*
* (2021-11-25) Added code for signatures #18, #19, and #22
* Reference: https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-04.html
*/
private void
signature_multi_precision_integer(int pub, int len)
{
switch (pub) {
case 1:
case 2:
case 3:
multi_precision_integer("RSA m^d mod n");
printf("\t\t-> PKCS-1\n");
break;
case 16:
case 20:
multi_precision_integer("ElGamal a = g^k mod p");
multi_precision_integer("ElGamal b = (h - a*x)/k mod p - 1");
break;
case 17:
multi_precision_integer("DSA r");
multi_precision_integer("DSA s");
printf("\t\t-> hash(DSA q bits)\n");
break;
case 18:
multi_precision_integer("ECDH G");
break;
case 19:
multi_precision_integer("ECDSA r");
multi_precision_integer("ECDSA s");
break;
case 22:
multi_precision_integer("EdDSA R");
multi_precision_integer("EdDSA s");
break;
default:
printf("\tUnknown signature(pub %d)\n", pub);
skip(len);
break;
}
}
private void
signature_type(int type)
{
printf("\tSig type - ");
switch (type) {
case 0x00:
printf("Signature of a binary document(0x00).");
break;
case 0x01:
printf("Signature of a canonical text document(0x01).");
break;
case 0x02:
printf("Standalone signature(0x02).");
break;
case 0x10:
printf("Generic certification of a User ID and Public Key packet(0x10).");
break;
case 0x11:
printf("Persona certification of a User ID and Public Key packet.(0x11)");
break;
case 0x12:
printf("Casual certification of a User ID and Public Key packet(0x12).");
break;
case 0x13:
printf("Positive certification of a User ID and Public Key packet(0x13).");
break;
case 0x18:
printf("Subkey Binding Signature(0x18).");
break;
case 0x19:
printf("Primary Key Binding Signature(0x19).");
break;
case 0x1f:
printf("Signature directly on a key(0x1f).");
break;
case 0x20:
printf("Key revocation signature(0x20).");
break;
case 0x28:
printf("Subkey revocation signature(0x28).");
break;
case 0x30:
printf("Certification revocation signature(0x30).");
break;
case 0x40:
printf("Timestamp signature(0x40).");
break;
case 0x50:
printf("Third-Party Confirmation signature(0x50).");
break;
default:
printf("unknown(%02x)", type);
break;
}
printf("\n");
}
public void
One_Pass_Signature_Packet(int len)
{
ver(NULL_VER, 3, Getc());
signature_type(Getc());
hash_algs(Getc());
pub_algs(Getc());
key_id();
printf("\tNext packet - ");
if (Getc() == 0)
printf("another one pass signature");
else
printf("other than one pass signature");
printf("\n");
}
public void
Signature_Packet(int len)
{
int ver;
ver = Getc();
printf("\tVer %d - ", ver);
switch (ver) {
case 2:
case 3:
printf("old\n");
old_Signature_Packet(len - 1);
break;
case 4:
printf("new\n");
new_Signature_Packet(len - 1);
break;
default:
printf("unknown\n");
skip(len - 1);
break;
}
}
private void
old_Signature_Packet(int len)
{
int pub;
printf("\tHash material(%d bytes):\n", Getc());
printf("\t");
signature_type(Getc());
printf("\t");
time4("Creation time");
key_id();
pub = Getc();
pub_algs(pub);
hash_algs(Getc());
hash2();
signature_multi_precision_integer(pub, len - 19);
}
private void
new_Signature_Packet(int len)
{
int pub, hsplen, usplen;
signature_type(Getc());
pub = Getc();
pub_algs(pub);
hash_algs(Getc());
hsplen = Getc() * 256;
hsplen += Getc();
parse_signature_subpacket("Hashed Sub", hsplen);
usplen = Getc() * 256;
usplen += Getc();
parse_signature_subpacket("Sub", usplen);
hash2();
signature_multi_precision_integer(pub, len - 9 - hsplen - usplen);
}
/*
* 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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