the librsa* library and reports which version of the library (OpenSSL/RSAREF) is being used. This is then used in openssh to detect the failure case of RSAREF and a RSA key >1024 bits, to print a more helpful error message than 'rsa_public_encrypt() fai led.' This is a 4.0-RELEASE candidate.
178 lines
3.9 KiB
C
178 lines
3.9 KiB
C
/*
|
|
*
|
|
* rsa.c
|
|
*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
*
|
|
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
*
|
|
* Created: Fri Mar 3 22:07:06 1995 ylo
|
|
*
|
|
* Description of the RSA algorithm can be found e.g. from the following sources:
|
|
*
|
|
* Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
|
|
*
|
|
* Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
|
|
* Computer Security. Prentice-Hall, 1989.
|
|
*
|
|
* Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
|
|
* 1994.
|
|
*
|
|
* R. Rivest, A. Shamir, and L. M. Adleman: Cryptographic Communications
|
|
* System and Method. US Patent 4,405,829, 1983.
|
|
*
|
|
* Hans Riesel: Prime Numbers and Computer Methods for Factorization.
|
|
* Birkhauser, 1994.
|
|
*
|
|
* The RSA Frequently Asked Questions document by RSA Data Security, Inc., 1995.
|
|
*
|
|
* RSA in 3 lines of perl by Adam Back <aba@atlax.ex.ac.uk>, 1995, as included
|
|
* below:
|
|
*
|
|
* [gone - had to be deleted - what a pity]
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$Id: rsa.c,v 1.12 2000/02/21 21:47:31 markus Exp $");
|
|
|
|
#include "rsa.h"
|
|
#include "ssh.h"
|
|
#include "xmalloc.h"
|
|
|
|
int rsa_verbose = 1;
|
|
|
|
int
|
|
rsa_alive()
|
|
{
|
|
RSA *key;
|
|
|
|
key = RSA_generate_key(32, 3, NULL, NULL);
|
|
if (key == NULL)
|
|
return (0);
|
|
RSA_free(key);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Generates RSA public and private keys. This initializes the data
|
|
* structures; they should be freed with rsa_clear_private_key and
|
|
* rsa_clear_public_key.
|
|
*/
|
|
|
|
void
|
|
rsa_generate_key(RSA *prv, RSA *pub, unsigned int bits)
|
|
{
|
|
RSA *key;
|
|
|
|
if (rsa_verbose) {
|
|
printf("Generating RSA keys: ");
|
|
fflush(stdout);
|
|
}
|
|
key = RSA_generate_key(bits, 35, NULL, NULL);
|
|
if (key == NULL)
|
|
fatal("rsa_generate_key: key generation failed.");
|
|
|
|
/* Copy public key parameters */
|
|
pub->n = BN_new();
|
|
BN_copy(pub->n, key->n);
|
|
pub->e = BN_new();
|
|
BN_copy(pub->e, key->e);
|
|
|
|
/* Copy private key parameters */
|
|
prv->n = BN_new();
|
|
BN_copy(prv->n, key->n);
|
|
prv->e = BN_new();
|
|
BN_copy(prv->e, key->e);
|
|
prv->d = BN_new();
|
|
BN_copy(prv->d, key->d);
|
|
prv->p = BN_new();
|
|
BN_copy(prv->p, key->p);
|
|
prv->q = BN_new();
|
|
BN_copy(prv->q, key->q);
|
|
|
|
prv->dmp1 = BN_new();
|
|
BN_copy(prv->dmp1, key->dmp1);
|
|
|
|
prv->dmq1 = BN_new();
|
|
BN_copy(prv->dmq1, key->dmq1);
|
|
|
|
prv->iqmp = BN_new();
|
|
BN_copy(prv->iqmp, key->iqmp);
|
|
|
|
RSA_free(key);
|
|
|
|
if (rsa_verbose)
|
|
printf("Key generation complete.\n");
|
|
}
|
|
|
|
void
|
|
rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
|
|
{
|
|
char *inbuf, *outbuf;
|
|
int len, ilen, olen;
|
|
|
|
if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
|
|
fatal("rsa_public_encrypt() exponent too small or not odd");
|
|
|
|
olen = BN_num_bytes(key->n);
|
|
outbuf = xmalloc(olen);
|
|
|
|
ilen = BN_num_bytes(in);
|
|
inbuf = xmalloc(ilen);
|
|
BN_bn2bin(in, inbuf);
|
|
|
|
if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
|
|
RSA_PKCS1_PADDING)) <= 0)
|
|
if (BN_num_bits(key->n) > 1024 && RSA_libversion() == RSALIB_RSAREF)
|
|
fatal("rsa_private_encrypt() failed: RSAREF cannot handle keys larger than 1024 bits.");
|
|
else
|
|
fatal("rsa_private_encrypt() failed.");
|
|
|
|
BN_bin2bn(outbuf, len, out);
|
|
|
|
memset(outbuf, 0, olen);
|
|
memset(inbuf, 0, ilen);
|
|
xfree(outbuf);
|
|
xfree(inbuf);
|
|
}
|
|
|
|
void
|
|
rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
|
|
{
|
|
char *inbuf, *outbuf;
|
|
int len, ilen, olen;
|
|
|
|
olen = BN_num_bytes(key->n);
|
|
outbuf = xmalloc(olen);
|
|
|
|
ilen = BN_num_bytes(in);
|
|
inbuf = xmalloc(ilen);
|
|
BN_bn2bin(in, inbuf);
|
|
|
|
if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
|
|
RSA_PKCS1_PADDING)) <= 0)
|
|
if (BN_num_bits(key->n) > 1024 && RSA_libversion() == RSALIB_RSAREF)
|
|
fatal("rsa_private_decrypt() failed: RSAREF cannot handle keys larger than 1024 bits.");
|
|
else
|
|
fatal("rsa_private_decrypt() failed.");
|
|
|
|
BN_bin2bn(outbuf, len, out);
|
|
|
|
memset(outbuf, 0, olen);
|
|
memset(inbuf, 0, ilen);
|
|
xfree(outbuf);
|
|
xfree(inbuf);
|
|
}
|
|
|
|
/* Set whether to output verbose messages during key generation. */
|
|
|
|
void
|
|
rsa_set_verbose(int verbose)
|
|
{
|
|
rsa_verbose = verbose;
|
|
}
|