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/*
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
*/
#include "includes.h"
RCSID("$Id: rsa.c,v 1.2 1999/11/08 04:30:59 damien 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 in_len;
int out_len;
int len;
if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
fatal("rsa_public_encrypt() exponent too small or not odd");
out_len = BN_num_bytes(key->n);
outbuf = xmalloc(out_len);
in_len = BN_num_bytes(in);
inbuf = xmalloc(in_len);
BN_bn2bin(in, inbuf);
if ((len = RSA_public_encrypt(in_len, inbuf, outbuf, key,
RSA_PKCS1_PADDING)) <= 0)
fatal("rsa_public_encrypt() failed");
BN_bin2bn(outbuf, len, out);
memset(outbuf, 0, out_len);
memset(inbuf, 0, in_len);
xfree(outbuf);
xfree(inbuf);
}
void
rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
{
char *inbuf, *outbuf;
int in_len;
int out_len;
int len;
out_len = BN_num_bytes(key->n);
outbuf = xmalloc(out_len);
in_len = BN_num_bytes(in);
inbuf = xmalloc(in_len);
BN_bn2bin(in, inbuf);
if ((len = RSA_private_decrypt(in_len, inbuf, outbuf, key,
RSA_SSLV23_PADDING)) <= 0)
fatal("rsa_private_decrypt() failed");
BN_bin2bn(outbuf, len, out);
memset(outbuf, 0, out_len);
memset(inbuf, 0, in_len);
xfree(outbuf);
xfree(inbuf);
}
/* Set whether to output verbose messages during key generation. */
void
rsa_set_verbose(int verbose)
{
rsa_verbose = verbose;
}
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