*/
#include "includes.h"
-RCSID("$OpenBSD: cipher.c,v 1.54 2002/03/19 10:49:35 markus Exp $");
+RCSID("$OpenBSD: cipher.c,v 1.62 2002/11/21 22:45:31 markus Exp $");
#include "xmalloc.h"
#include "log.h"
#include "cipher.h"
#include <openssl/md5.h>
-#include "rijndael.h"
#if OPENSSL_VERSION_NUMBER < 0x00906000L
#define SSH_OLD_EVP
#define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
#endif
-static EVP_CIPHER *evp_ssh1_3des(void);
-static EVP_CIPHER *evp_ssh1_bf(void);
-static EVP_CIPHER *evp_rijndael(void);
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+#include "rijndael.h"
+static const EVP_CIPHER *evp_rijndael(void);
+#endif
+static const EVP_CIPHER *evp_ssh1_3des(void);
+static const EVP_CIPHER *evp_ssh1_bf(void);
struct Cipher {
char *name;
int number; /* for ssh1 only */
u_int block_size;
u_int key_len;
- EVP_CIPHER *(*evptype)(void);
+ const EVP_CIPHER *(*evptype)(void);
} ciphers[] = {
{ "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null },
{ "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc },
{ "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc },
{ "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc },
{ "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 },
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
{ "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael },
{ "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael },
{ "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
+ { "rijndael-cbc@lysator.liu.se",
+ SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
+#else
+ { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc },
+ { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc },
+ { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
+ { "rijndael-cbc@lysator.liu.se",
+ SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc },
+#endif
{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL }
};
{
return (c->block_size);
}
+
u_int
cipher_keylen(Cipher *c)
{
return (c->key_len);
}
+
u_int
cipher_get_number(Cipher *c)
{
cipher->name);
klen = EVP_CIPHER_CTX_key_length(&cc->evp);
if (klen > 0 && keylen != klen) {
- debug("cipher_init: set keylen (%d -> %d)", klen, keylen);
+ debug2("cipher_init: set keylen (%d -> %d)", klen, keylen);
if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
fatal("cipher_init: set keylen failed (%d -> %d)",
klen, keylen);
{
EVP_CIPHER_CTX k1, k2, k3;
};
+
static int
ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
int enc)
#endif
return (1);
}
+
static int
ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len)
{
#endif
return (1);
}
+
static int
ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx)
{
}
return (1);
}
-static EVP_CIPHER *
+
+static const EVP_CIPHER *
evp_ssh1_3des(void)
{
static EVP_CIPHER ssh1_3des;
*dst++ = c[3];
}
}
+
+#ifdef SSH_OLD_EVP
+static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ if (iv != NULL)
+ memcpy (&(ctx->oiv[0]), iv, 8);
+ memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8);
+ if (key != NULL)
+ BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx),
+ key);
+}
+#endif
static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
+
static int
bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
{
swap_bytes(out, out, len);
return (ret);
}
-static EVP_CIPHER *
+
+static const EVP_CIPHER *
evp_ssh1_bf(void)
{
static EVP_CIPHER ssh1_bf;
memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
orig_bf = ssh1_bf.do_cipher;
ssh1_bf.nid = NID_undef;
+#ifdef SSH_OLD_EVP
+ ssh1_bf.init = bf_ssh1_init;
+#endif
ssh1_bf.do_cipher = bf_ssh1_cipher;
ssh1_bf.key_len = 32;
return (&ssh1_bf);
}
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
/* RIJNDAEL */
#define RIJNDAEL_BLOCKSIZE 16
struct ssh_rijndael_ctx
memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
return (1);
}
+
static int
ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
u_int len)
for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
plain-=RIJNDAEL_BLOCKSIZE) {
rijndael_decrypt(&c->r_ctx, cnow, plain);
+ ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
+ for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
+ plain[j] ^= ivp[j];
+ }
+ memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
+ }
+ return (1);
+}
+
+static int
+ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
+{
+ struct ssh_rijndael_ctx *c;
+
+ if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
+ memset(c, 0, sizeof(*c));
+ xfree(c);
+ EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+ }
+ return (1);
+}
+
+static const EVP_CIPHER *
+evp_rijndael(void)
+{
+ static EVP_CIPHER rijndal_cbc;
+
+ memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
+ rijndal_cbc.nid = NID_undef;
+ rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
+ rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
+ rijndal_cbc.key_len = 16;
+ rijndal_cbc.init = ssh_rijndael_init;
+ rijndal_cbc.cleanup = ssh_rijndael_cleanup;
+ rijndal_cbc.do_cipher = ssh_rijndael_cbc;
+#ifndef SSH_OLD_EVP
+ rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
+ EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
+#endif
+ return (&rijndal_cbc);
}
+#endif
/*
* Exports an IV from the CipherContext required to export the key
if (evplen == 0)
return;
if (evplen != len)
- fatal("%s: wrong iv length %d != %d", __FUNCTION__,
+ fatal("%s: wrong iv length %d != %d", __func__,
evplen, len);
- if (strncmp(c->name, "aes", 3) == 0) {
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+ if (c->evptype == evp_rijndael) {
struct ssh_rijndael_ctx *aesc;
aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
if (aesc == NULL)
- fatal("%s: no rijndael context", __FUNCTION__);
+ fatal("%s: no rijndael context", __func__);
civ = aesc->r_iv;
- } else {
+ } else
+#endif
+ {
civ = cc->evp.iv;
}
break;
case SSH_CIPHER_3DES: {
struct ssh1_3des_ctx *desc;
if (len != 24)
- fatal("%s: bad 3des iv length: %d", __FUNCTION__, len);
+ fatal("%s: bad 3des iv length: %d", __func__, len);
desc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
if (desc == NULL)
- fatal("%s: no 3des context", __FUNCTION__);
- debug3("%s: Copying 3DES IV", __FUNCTION__);
+ fatal("%s: no 3des context", __func__);
+ debug3("%s: Copying 3DES IV", __func__);
memcpy(iv, desc->k1.iv, 8);
memcpy(iv + 8, desc->k2.iv, 8);
memcpy(iv + 16, desc->k3.iv, 8);
return;
}
default:
- fatal("%s: bad cipher %d", __FUNCTION__, c->number);
+ fatal("%s: bad cipher %d", __func__, c->number);
}
memcpy(iv, civ, len);
}
if (evplen == 0)
return;
- if (strncmp(c->name, "aes", 3) == 0) {
+#if OPENSSL_VERSION_NUMBER < 0x00907000L
+ if (c->evptype == evp_rijndael) {
struct ssh_rijndael_ctx *aesc;
aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
if (aesc == NULL)
- fatal("%s: no rijndael context", __FUNCTION__);
+ fatal("%s: no rijndael context", __func__);
div = aesc->r_iv;
- }else {
+ } else
+#endif
+ {
div = cc->evp.iv;
}
break;
struct ssh1_3des_ctx *desc;
desc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
if (desc == NULL)
- fatal("%s: no 3des context", __FUNCTION__);
- debug3("%s: Installed 3DES IV", __FUNCTION__);
+ fatal("%s: no 3des context", __func__);
+ debug3("%s: Installed 3DES IV", __func__);
memcpy(desc->k1.iv, iv, 8);
memcpy(desc->k2.iv, iv + 8, 8);
memcpy(desc->k3.iv, iv + 16, 8);
return;
}
default:
- fatal("%s: bad cipher %d", __FUNCTION__, c->number);
+ fatal("%s: bad cipher %d", __func__, c->number);
}
memcpy(div, iv, evplen);
}
cipher_get_keycontext(CipherContext *cc, u_char *dat)
{
Cipher *c = cc->cipher;
- int plen;
+ int plen = 0;
- if (c->number == SSH_CIPHER_3DES) {
- struct ssh1_3des_ctx *desc;
- desc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
- if (desc == NULL)
- fatal("%s: no 3des context", __FUNCTION__);
- plen = EVP_X_STATE_LEN(desc->k1);
+ if (c->evptype == EVP_rc4) {
+ plen = EVP_X_STATE_LEN(cc->evp);
if (dat == NULL)
- return (3*plen);
- memcpy(dat, EVP_X_STATE(desc->k1), plen);
- memcpy(dat + plen, EVP_X_STATE(desc->k2), plen);
- memcpy(dat + 2*plen, EVP_X_STATE(desc->k3), plen);
- return (3*plen);
+ return (plen);
+ memcpy(dat, EVP_X_STATE(cc->evp), plen);
}
-
- /* Generic EVP */
- plen = EVP_X_STATE_LEN(cc->evp);
- if (dat == NULL)
- return (plen);
-
- memcpy(dat, EVP_X_STATE(cc->evp), plen);
return (plen);
}
Cipher *c = cc->cipher;
int plen;
- if (c->number == SSH_CIPHER_3DES) {
- struct ssh1_3des_ctx *desc;
- desc = EVP_CIPHER_CTX_get_app_data(&cc->evp);
- if (desc == NULL)
- fatal("%s: no 3des context", __FUNCTION__);
- plen = EVP_X_STATE_LEN(desc->k1);
- memcpy(EVP_X_STATE(desc->k1), dat, plen);
- memcpy(EVP_X_STATE(desc->k2), dat + plen, plen);
- memcpy(EVP_X_STATE(desc->k3), dat + 2*plen, plen);
- } else {
+ if (c->evptype == EVP_rc4) {
plen = EVP_X_STATE_LEN(cc->evp);
memcpy(EVP_X_STATE(cc->evp), dat, plen);
}
- ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
- for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
- plain[j] ^= ivp[j];
- }
- memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
- }
- return (1);
-}
-static int
-ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
-{
- struct ssh_rijndael_ctx *c;
-
- if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
- memset(c, 0, sizeof(*c));
- xfree(c);
- EVP_CIPHER_CTX_set_app_data(ctx, NULL);
- }
- return (1);
-}
-static EVP_CIPHER *
-evp_rijndael(void)
-{
- static EVP_CIPHER rijndal_cbc;
-
- memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
- rijndal_cbc.nid = NID_undef;
- rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
- rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
- rijndal_cbc.key_len = 16;
- rijndal_cbc.init = ssh_rijndael_init;
- rijndal_cbc.cleanup = ssh_rijndael_cleanup;
- rijndal_cbc.do_cipher = ssh_rijndael_cbc;
-#ifndef SSH_OLD_EVP
- rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
- EVP_CIPH_ALWAYS_CALL_INIT;
-#endif
- return (&rijndal_cbc);
}
andersk / openssh.git / blobdiff