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/*
* sshcrypto.c
*
* SSH-1 crypto routines, adapted from OpenSSH.
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
* Copyright (c) 2000 Niels Provos <provos@monkey.org>
* Copyright (c) 2000 Markus Friedl <markus@openbsd.org>
*
* $Id: sshcrypto.c,v 1.5 2001/03/15 08:33:04 dugsong Exp $
*/
#include "config.h"
#include <sys/types.h>
#include <openssl/ssl.h>
#include <openssl/blowfish.h>
#include <openssl/des.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include "sshcrypto.h"
struct blowfish_state {
struct bf_key_st key;
u_char iv[8];
};
struct des3_state {
des_key_schedule k1, k2, k3;
des_cblock iv1, iv2, iv3;
};
void
rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
{
u_char *inbuf, *outbuf;
int len, ilen, olen;
if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
errx(1, "rsa_public_encrypt() exponent too small or not odd");
olen = BN_num_bytes(key->n);
outbuf = malloc(olen);
ilen = BN_num_bytes(in);
inbuf = malloc(ilen);
if (outbuf == NULL || inbuf == NULL)
err(1, "malloc");
BN_bn2bin(in, inbuf);
if ((len = RSA_public_encrypt(ilen, inbuf, outbuf, key,
RSA_PKCS1_PADDING)) <= 0)
errx(1, "rsa_public_encrypt() failed");
BN_bin2bn(outbuf, len, out);
memset(outbuf, 0, olen);
memset(inbuf, 0, ilen);
free(outbuf);
free(inbuf);
}
void
rsa_private_decrypt(BIGNUM *out, BIGNUM *in, RSA *key)
{
u_char *inbuf, *outbuf;
int len, ilen, olen;
olen = BN_num_bytes(key->n);
outbuf = malloc(olen);
ilen = BN_num_bytes(in);
inbuf = malloc(ilen);
if (outbuf == NULL || inbuf == NULL)
err(1, "malloc");
BN_bn2bin(in, inbuf);
if ((len = RSA_private_decrypt(ilen, inbuf, outbuf, key,
RSA_PKCS1_PADDING)) <= 0)
errx(1, "rsa_private_decrypt() failed");
BN_bin2bn(outbuf, len, out);
memset(outbuf, 0, olen);
memset(inbuf, 0, ilen);
free(outbuf);
free(inbuf);
}
/* XXX - SSH1's weirdo Blowfish... */
static void
swap_bytes(const u_char *src, u_char *dst, int n)
{
char c[4];
for (n = n / 4; n > 0; n--) {
c[3] = *src++; c[2] = *src++;
c[1] = *src++; c[0] = *src++;
*dst++ = c[0]; *dst++ = c[1];
*dst++ = c[2]; *dst++ = c[3];
}
}
void *
blowfish_init(u_char *sesskey, int len)
{
struct blowfish_state *state;
if ((state = malloc(sizeof(*state))) == NULL)
err(1, "malloc");
BF_set_key(&state->key, len, sesskey);
memset(state->iv, 0, 8);
return (state);
}
void
blowfish_encrypt(u_char *src, u_char *dst, int len, void *state)
{
struct blowfish_state *estate;
estate = (struct blowfish_state *)state;
swap_bytes(src, dst, len);
BF_cbc_encrypt((void *)dst, dst, len, &estate->key, estate->iv,
BF_ENCRYPT);
swap_bytes(dst, dst, len);
}
void
blowfish_decrypt(u_char *src, u_char *dst, int len, void *state)
{
struct blowfish_state *dstate;
dstate = (struct blowfish_state *)state;
swap_bytes(src, dst, len);
BF_cbc_encrypt((void *)dst, dst, len, &dstate->key, dstate->iv,
BF_DECRYPT);
swap_bytes(dst, dst, len);
}
/* XXX - SSH1's weirdo 3DES... */
void *
des3_init(u_char *sesskey, int len)
{
struct des3_state *state;
if ((state = malloc(sizeof(*state))) == NULL)
err(1, "malloc");
des_set_key((void *)sesskey, state->k1);
des_set_key((void *)(sesskey + 8), state->k2);
if (len <= 16)
des_set_key((void *)sesskey, state->k3);
else
des_set_key((void *)(sesskey + 16), state->k3);
memset(state->iv1, 0, 8);
memset(state->iv2, 0, 8);
memset(state->iv3, 0, 8);
return (state);
}
void
des3_encrypt(u_char *src, u_char *dst, int len, void *state)
{
struct des3_state *estate;
estate = (struct des3_state *)state;
memcpy(estate->iv1, estate->iv2, 8);
des_ncbc_encrypt(src, dst, len, estate->k1, &estate->iv1, DES_ENCRYPT);
des_ncbc_encrypt(dst, dst, len, estate->k2, &estate->iv2, DES_DECRYPT);
des_ncbc_encrypt(dst, dst, len, estate->k3, &estate->iv3, DES_ENCRYPT);
}
void
des3_decrypt(u_char *src, u_char *dst, int len, void *state)
{
struct des3_state *dstate;
dstate = (struct des3_state *)state;
memcpy(dstate->iv1, dstate->iv2, 8);
des_ncbc_encrypt(src, dst, len, dstate->k3, &dstate->iv3, DES_DECRYPT);
des_ncbc_encrypt(dst, dst, len, dstate->k2, &dstate->iv2, DES_ENCRYPT);
des_ncbc_encrypt(dst, dst, len, dstate->k1, &dstate->iv1, DES_DECRYPT);
}
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