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cryptodata.h
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cryptodata.h
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/*
* easy-signing-party: simple utilities used to do a signing party
* Copyright (C) 2017 Iru Cai <[email protected]>
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
/* RSA public key data parsed from public key packet */
struct RSA_pubkey {
uint32_t rsa_nlen;
uint32_t rsa_elen;
uint8_t keyhash[20];
uint8_t RSA_n[1024];
uint8_t RSA_e[1024];
};
/* signature data parsed from signature packet */
typedef struct siginfo {
uint8_t hashdata[1024];
uint32_t siglen;
uint8_t sigdata[1024];
uint8_t issuer[8];
uint8_t issuer_fpr[20];
uint8_t has_fpr;
uint8_t sigtype;
uint8_t pubalgo;
uint8_t hashalgo;
/* hashlen: the length of the part of signature packet
needed to hash when creating a signature
hashlen = 6+<length of the hashed subpackets>
*/
uint32_t hashlen;
/* unhashlen: the length of subpackets unhashed */
uint32_t unhashlen;
uint8_t hashleft[2];
} siginfo;
enum HashAlgo {
HASH_MD5=1,
HASH_SHA1,
HASH_RIPEMD160,
HASH_SHA256=8,
HASH_SHA384,
HASH_SHA512,
HASH_SHA224
};
int parse_pubkey(uint8_t *buff, struct RSA_pubkey *rsa_info);
int find_pubkey(uint8_t *buff, int bufflen, struct RSA_pubkey *rsa_info, const uint8_t *keyid);
int parse_sigpkt(const uint8_t *buffer, siginfo *pgpdata);
/* verify RSA signature */
int sigverify(
const uint8_t *sigdata, uint32_t siglen_bytes,
uint8_t hashalgo, const uint8_t *digest_toverify,
struct RSA_pubkey *pubkey);