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boinc/lib/crypt_prog.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2019 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// utility program for encryption.
//
// -genkey n private_keyfile public_keyfile
// create a key pair with n bits (512 <= n <= 1024)
// write it in hex notation
// -sign file private_keyfile
// create a signature for a given file
// write it in hex notation
// -sign_string string private_keyfile
// create a signature for a given string
// write it in hex notation
// -verify file signature_file public_keyfile
// verify a signature
// -test_crypt private_keyfile public_keyfile
// test encrypt/decrypt
// -convkey o2b/b2o priv/pub input_file output_file
// convert keys between BOINC and OpenSSL format
// -cert_verify file signature_file certificate_dir
// verify a signature using a directory of certificates
#if defined(_WIN32)
#include <windows.h>
#else
#include "config.h"
#endif
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "openssl/bio.h"
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include "crypt.h"
#include "md5_file.h"
void die(const char* p) {
fprintf(stderr, "Error: %s\n", p);
exit(2);
}
void usage() {
fprintf(stderr,
"Usage: crypt_prog options\n\n"
"Options:\n\n"
"-genkey n private_keyfile public_keyfile\n"
" create an n-bit key pair\n"
"-sign file private_keyfile\n"
" create a signature for a given file, write to stdout\n"
"-sign_string string private_keyfile\n"
" create a signature for a given string\n"
"-verify file signature_file public_keyfile\n"
" verify a signature\n"
"-test_crypt private_keyfile public_keyfile\n"
" test encrypt/decrypt functions\n"
"-convkey o2b/b2o priv/pub input_file output_file\n"
" convert keys between BOINC and OpenSSL format\n"
"-cert_verify file signature certificate_dir\n"
" verify a signature using a directory of certificates\n"
);
}
unsigned int random_int() {
unsigned int n;
#if defined(_WIN32)
#if defined(__CYGWIN32__)
HMODULE hLib=LoadLibrary((const char *)"ADVAPI32.DLL");
#else
HMODULE hLib=LoadLibrary("ADVAPI32.DLL");
#endif
if (!hLib) {
die("Can't load ADVAPI32.DLL");
}
BOOLEAN (APIENTRY *pfn)(void*, ULONG) =
(BOOLEAN (APIENTRY *)(void*,ULONG))GetProcAddress(hLib,"SystemFunction036");
if (pfn) {
char buff[32];
ULONG ulCbBuff = sizeof(buff);
if(pfn(buff,ulCbBuff)) {
// use buff full of random goop
memcpy(&n,buff,sizeof(n));
}
}
FreeLibrary(hLib);
#else
FILE* f = fopen("/dev/random", "r");
if (!f) {
die("can't open /dev/random\n");
}
if (1 != fread(&n, sizeof(n), 1, f)) {
die("couldn't read from /dev/random\n");
}
fclose(f);
#endif
return n;
}
int main(int argc, char** argv) {
R_RSA_PUBLIC_KEY public_key;
R_RSA_PRIVATE_KEY private_key;
int i, n, retval;
bool is_valid;
DATA_BLOCK signature, in, out;
unsigned char signature_buf[256], buf[256], buf2[256];
FILE *f, *fpriv, *fpub;
char cbuf[256];
#ifdef HAVE_OPAQUE_RSA_DSA_DH
RSA *rsa_key = RSA_new();
#else
RSA rsa_key;
#endif
RSA *rsa_key_;
BIO *bio_out=NULL;
BIO *bio_err=NULL;
char *certpath;
bool b2o=false; // boinc key to openssl key ?
bool kpriv=false; // private key ?
BIGNUM *e;
if (argc == 1) {
usage();
exit(1);
}
if (!strcmp(argv[1], "-genkey")) {
if (argc < 5) {
usage();
exit(1);
}
printf("creating keys in %s and %s\n", argv[3], argv[4]);
n = atoi(argv[2]);
srand(random_int());
e = BN_new();
retval = BN_set_word(e, (unsigned long)65537);
if (retval != 1) {
die("BN_set_word");
}
RSA *rp = RSA_new();
retval = RSA_generate_key_ex(rp, n, e, NULL);
if (retval != 1) {
die("RSA_generate_key_ex");
}
openssl_to_keys(rp, n, private_key, public_key);
fpriv = fopen(argv[3], "w");
if (!fpriv) die("fopen");
fpub = fopen(argv[4], "w");
if (!fpub) die("fopen");
print_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
print_key_hex(fpub, (KEY*)&public_key, sizeof(public_key));
} else if (!strcmp(argv[1], "-sign")) {
if (argc < 4) {
usage();
exit(1);
}
fpriv = fopen(argv[3], "r");
if (!fpriv) die("fopen");
retval = scan_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
if (retval) die("scan_key_hex\n");
signature.data = signature_buf;
signature.len = 256;
retval = sign_file(argv[2], private_key, signature);
print_hex_data(stdout, signature);
} else if (!strcmp(argv[1], "-sign_string")) {
if (argc < 4) {
usage();
exit(1);
}
fpriv = fopen(argv[3], "r");
if (!fpriv) die("fopen");
retval = scan_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
if (retval) die("scan_key_hex\n");
generate_signature(argv[2], cbuf, private_key);
puts(cbuf);
} else if (!strcmp(argv[1], "-verify")) {
if (argc < 5) {
usage();
exit(1);
}
fpub = fopen(argv[4], "r");
if (!fpub) die("fopen");
retval = scan_key_hex(fpub, (KEY*)&public_key, sizeof(public_key));
if (retval) die("read_public_key");
f = fopen(argv[3], "r");
if (!f) die("fopen");
signature.data = signature_buf;
signature.len = 256;
retval = scan_hex_data(f, signature);
if (retval) die("scan_hex_data");
char md5_buf[64];
double size;
retval = md5_file(argv[2], md5_buf, size);
if (retval) die("md5_file");
retval = check_file_signature(
md5_buf, public_key, signature, is_valid
);
if (retval) die("check_file_signature");
if (is_valid) {
printf("file is valid\n");
} else {
printf("file is invalid\n");
return 1;
}
} else if (!strcmp(argv[1], "-test_crypt")) {
if (argc < 4) {
usage();
exit(1);
}
fpriv = fopen(argv[2], "r");
if (!fpriv) die("fopen");
retval = scan_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
if (retval) die("scan_key_hex\n");
fpub = fopen(argv[3], "r");
if (!fpub) die("fopen");
retval = scan_key_hex(fpub, (KEY*)&public_key, sizeof(public_key));
if (retval) die("read_public_key");
strcpy((char*)buf2, "encryption test successful");
in.data = buf2;
in.len = strlen((char*)in.data);
out.data = buf;
encrypt_private(private_key, in, out);
in = out;
out.data = buf2;
decrypt_public(public_key, in, out);
printf("out: %s\n", out.data);
} else if (!strcmp(argv[1], "-cert_verify")) {
if (argc < 6)
die("usage: crypt_prog -cert_verify file signature_file certificate_dir ca_dir \n");
f = fopen(argv[3], "r");
if (!f) die("fopen");
signature.data = signature_buf;
signature.len = 256;
retval = scan_hex_data(f, signature);
if (retval) die("cannot scan_hex_data");
certpath = check_validity(argv[4], argv[2], signature.data, argv[5]);
if (certpath == NULL) {
die("signature cannot be verified.\n\n");
} else {
printf("signature verified using certificate '%s'.\n\n", certpath);
free(certpath);
}
// this converts, but an executable signed with sign_executable,
// and signature converted to OpenSSL format cannot be verified with
// OpenSSL
} else if (!strcmp(argv[1], "-convsig")) {
if (argc < 5) {
usage();
exit(1);
}
if (strcmp(argv[2], "b2o") == 0) {
b2o = true;
} else if (strcmp(argv[2], "o2b") == 0) {
b2o = false;
} else {
die("either 'o2b' or 'b2o' must be defined for -convsig\n");
}
if (b2o) {
f = fopen(argv[3], "r");
if (!f) die("fopen");
signature.data = signature_buf;
signature.len = 256;
retval = scan_hex_data(f, signature);
fclose(f);
f = fopen(argv[4], "w+");
if (!f) die("fopen");
print_raw_data(f, signature);
fclose(f);
} else {
f = fopen(argv[3], "r");
if (!f) die("fopen");
signature.data = signature_buf;
signature.len = 256;
retval = scan_raw_data(f, signature);
fclose(f);
f = fopen(argv[4], "w+");
if (!f) die("fopen");
print_hex_data(f, signature);
fclose(f);
}
} else if (!strcmp(argv[1], "-convkey")) {
if (argc < 6) {
usage();
exit(1);
}
if (strcmp(argv[2], "b2o") == 0) {
b2o = true;
} else if (strcmp(argv[2], "o2b") == 0) {
b2o = false;
} else {
die("either 'o2b' or 'b2o' must be defined for -convkey\n");
}
if (strcmp(argv[3], "pub") == 0) {
kpriv = false;
} else if (strcmp(argv[3], "priv") == 0) {
kpriv = true;
} else {
die("either 'pub' or 'priv' must be defined for -convkey\n");
}
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
ENGINE_load_builtin_engines();
if (bio_err == NULL) {
bio_err = BIO_new_fp(stdout, BIO_NOCLOSE);
}
//enc=EVP_get_cipherbyname("des");
//if (enc == NULL)
// die("could not get cypher.\n");
// no encryption yet.
bio_out=BIO_new(BIO_s_file());
if (BIO_write_filename(bio_out,argv[5]) <= 0) {
perror(argv[5]);
die("could not create output file.\n");
}
if (b2o) {
rsa_key_ = RSA_new();
if (kpriv) {
fpriv = fopen(argv[4], "r");
if (!fpriv) {
die("fopen");
}
retval = scan_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
fclose(fpriv);
if (retval) die("scan_key_hex\n");
#ifdef HAVE_OPAQUE_RSA_DSA_DH
private_to_openssl(private_key, rsa_key);
#else
private_to_openssl(private_key, &rsa_key);
#endif
//i = PEM_write_bio_RSAPrivateKey(bio_out, &rsa_key,
// enc, NULL, 0, pass_cb, NULL);
// no encryption yet.
//i = PEM_write_bio_RSAPrivateKey(bio_out, &rsa_key,
// NULL, NULL, 0, pass_cb, NULL);
fpriv = fopen(argv[5], "w+");
if (!fpriv) die("fopen");
#ifdef HAVE_OPAQUE_RSA_DSA_DH
PEM_write_RSAPrivateKey(fpriv, rsa_key, NULL, NULL, 0, 0, NULL);
#else
PEM_write_RSAPrivateKey(fpriv, &rsa_key, NULL, NULL, 0, 0, NULL);
#endif
fclose(fpriv);
//if (i == 0) {
// ERR_print_errors(bio_err);
// die("could not write key file.\n");
//}
} else {
fpub = fopen(argv[4], "r");
if (!fpub) {
die("fopen");
}
retval = scan_key_hex(fpub, (KEY*)&public_key, sizeof(public_key));
fclose(fpub);
if (retval) die("scan_key_hex\n");
fpub = fopen(argv[5], "w+");
if (!fpub) {
die("fopen");
}
public_to_openssl(public_key, rsa_key_);
i = PEM_write_RSA_PUBKEY(fpub, rsa_key_);
if (i == 0) {
ERR_print_errors(bio_err);
die("could not write key file.\n");
}
fclose(fpub);
}
} else {
// o2b
rsa_key_ = RSA_new();
if (rsa_key_ == NULL) {
die("could not allocate memory for RSA structure.\n");
}
if (kpriv) {
fpriv = fopen (argv[4], "r");
if (!fpriv) die("fopen");
rsa_key_ = PEM_read_RSAPrivateKey(fpriv, NULL, NULL, NULL);
fclose(fpriv);
if (rsa_key_ == NULL) {
ERR_print_errors(bio_err);
die("could not load private key.\n");
}
openssl_to_private(rsa_key_, &private_key);
fpriv = fopen(argv[5], "w");
if (!fpriv) {
die("fopen");
}
print_key_hex(fpriv, (KEY*)&private_key, sizeof(private_key));
} else {
fpub = fopen (argv[4], "r");
if (!fpub) die("fopen");
rsa_key_ = PEM_read_RSA_PUBKEY(fpub, NULL, NULL, NULL);
fclose(fpub);
if (rsa_key_ == NULL) {
ERR_print_errors(bio_err);
die("could not load public key.\n");
}
openssl_to_keys(rsa_key_, 1024, private_key, public_key);
//openssl_to_public(rsa_key_, &public_key);
public_to_openssl(public_key, rsa_key_); //
fpub = fopen(argv[5], "w");
if (!fpub) {
die("fopen");
}
print_key_hex(fpub, (KEY*)&public_key, sizeof(public_key));
}
}
} else {
usage();
exit(1);
}
return 0;
}
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