-/* $OpenBSD: cipher.c,v 1.82 2009/01/26 09:58:15 markus Exp $ */
+/* $OpenBSD: cipher.c,v 1.100 2015/01/14 10:29:45 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
#include <sys/types.h>
-#include <openssl/md5.h>
-
#include <string.h>
#include <stdarg.h>
+#include <stdio.h>
-#include "xmalloc.h"
-#include "log.h"
#include "cipher.h"
+#include "misc.h"
+#include "sshbuf.h"
+#include "ssherr.h"
+#include "digest.h"
-/* compatibility with old or broken OpenSSL versions */
#include "openbsd-compat/openssl-compat.h"
+#ifdef WITH_SSH1
extern const EVP_CIPHER *evp_ssh1_bf(void);
extern const EVP_CIPHER *evp_ssh1_3des(void);
-extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
-extern const EVP_CIPHER *evp_aes_128_ctr(void);
-extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
+extern int ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int);
+#endif
-struct Cipher {
+struct sshcipher {
char *name;
int number; /* for ssh1 only */
u_int block_size;
u_int key_len;
+ u_int iv_len; /* defaults to block_size */
+ u_int auth_len;
u_int discard_len;
- u_int cbc_mode;
+ u_int flags;
+#define CFLAG_CBC (1<<0)
+#define CFLAG_CHACHAPOLY (1<<1)
+#define CFLAG_AESCTR (1<<2)
+#define CFLAG_NONE (1<<3)
+#ifdef WITH_OPENSSL
const EVP_CIPHER *(*evptype)(void);
-} ciphers[] = {
- { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, EVP_enc_null },
- { "des", SSH_CIPHER_DES, 8, 8, 0, 1, EVP_des_cbc },
- { "3des", SSH_CIPHER_3DES, 8, 16, 0, 1, evp_ssh1_3des },
- { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 1, evp_ssh1_bf },
-
- { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 1, EVP_des_ede3_cbc },
- { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_bf_cbc },
-#ifndef ANDROID
- { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, 0, 1, EVP_cast5_cbc },
+#else
+ void *ignored;
+#endif
+};
+
+static const struct sshcipher ciphers[] = {
+#ifdef WITH_SSH1
+ { "des", SSH_CIPHER_DES, 8, 8, 0, 0, 0, 1, EVP_des_cbc },
+ { "3des", SSH_CIPHER_3DES, 8, 16, 0, 0, 0, 1, evp_ssh1_3des },
+ { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, 0, 0, 0, 1, evp_ssh1_bf },
+#endif /* WITH_SSH1 */
+#ifdef WITH_OPENSSL
+ { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, 0, 0, EVP_enc_null },
+#if !defined(ANDROID)
+ { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, 0, 0, 0, 1, EVP_des_ede3_cbc },
+ { "blowfish-cbc",
+ SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_bf_cbc },
+ { "cast128-cbc",
+ SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_cast5_cbc },
#endif
- { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, EVP_rc4 },
- { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 1536, 0, EVP_rc4 },
- { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 1536, 0, EVP_rc4 },
- { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 1, EVP_aes_128_cbc },
- { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 1, EVP_aes_192_cbc },
- { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
+ { "arcfour", SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 0, EVP_rc4 },
+ { "arcfour128", SSH_CIPHER_SSH2, 8, 16, 0, 0, 1536, 0, EVP_rc4 },
+ { "arcfour256", SSH_CIPHER_SSH2, 8, 32, 0, 0, 1536, 0, EVP_rc4 },
+ { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 1, EVP_aes_128_cbc },
+ { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 1, EVP_aes_192_cbc },
+ { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
{ "rijndael-cbc@lysator.liu.se",
- SSH_CIPHER_SSH2, 16, 32, 0, 1, EVP_aes_256_cbc },
- { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, evp_aes_128_ctr },
- { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, evp_aes_128_ctr },
- { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, evp_aes_128_ctr },
-#ifdef USE_CIPHER_ACSS
- { "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, 0, 0, EVP_acss },
+ SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 0, EVP_aes_128_ctr },
+#if !defined(ANDROID)
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 0, EVP_aes_192_ctr },
#endif
- { NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, NULL }
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 0, EVP_aes_256_ctr },
+# ifdef OPENSSL_HAVE_EVPGCM
+ { "aes128-gcm@openssh.com",
+ SSH_CIPHER_SSH2, 16, 16, 12, 16, 0, 0, EVP_aes_128_gcm },
+ { "aes256-gcm@openssh.com",
+ SSH_CIPHER_SSH2, 16, 32, 12, 16, 0, 0, EVP_aes_256_gcm },
+# endif /* OPENSSL_HAVE_EVPGCM */
+#else /* WITH_OPENSSL */
+ { "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, CFLAG_AESCTR, NULL },
+ { "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, CFLAG_AESCTR, NULL },
+ { "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, CFLAG_AESCTR, NULL },
+ { "none", SSH_CIPHER_NONE, 8, 0, 0, 0, 0, CFLAG_NONE, NULL },
+#endif /* WITH_OPENSSL */
+ { "chacha20-poly1305@openssh.com",
+ SSH_CIPHER_SSH2, 8, 64, 0, 16, 0, CFLAG_CHACHAPOLY, NULL },
+
+ { NULL, SSH_CIPHER_INVALID, 0, 0, 0, 0, 0, 0, NULL }
};
/*--*/
+/* Returns a comma-separated list of supported ciphers. */
+char *
+cipher_alg_list(char sep, int auth_only)
+{
+ char *tmp, *ret = NULL;
+ size_t nlen, rlen = 0;
+ const struct sshcipher *c;
+
+ for (c = ciphers; c->name != NULL; c++) {
+ if (c->number != SSH_CIPHER_SSH2)
+ continue;
+ if (auth_only && c->auth_len == 0)
+ continue;
+ if (ret != NULL)
+ ret[rlen++] = sep;
+ nlen = strlen(c->name);
+ if ((tmp = realloc(ret, rlen + nlen + 2)) == NULL) {
+ free(ret);
+ return NULL;
+ }
+ ret = tmp;
+ memcpy(ret + rlen, c->name, nlen + 1);
+ rlen += nlen;
+ }
+ return ret;
+}
+
u_int
-cipher_blocksize(const Cipher *c)
+cipher_blocksize(const struct sshcipher *c)
{
return (c->block_size);
}
u_int
-cipher_keylen(const Cipher *c)
+cipher_keylen(const struct sshcipher *c)
{
return (c->key_len);
}
u_int
-cipher_get_number(const Cipher *c)
+cipher_seclen(const struct sshcipher *c)
+{
+ if (strcmp("3des-cbc", c->name) == 0)
+ return 14;
+ return cipher_keylen(c);
+}
+
+u_int
+cipher_authlen(const struct sshcipher *c)
+{
+ return (c->auth_len);
+}
+
+u_int
+cipher_ivlen(const struct sshcipher *c)
+{
+ /*
+ * Default is cipher block size, except for chacha20+poly1305 that
+ * needs no IV. XXX make iv_len == -1 default?
+ */
+ return (c->iv_len != 0 || (c->flags & CFLAG_CHACHAPOLY) != 0) ?
+ c->iv_len : c->block_size;
+}
+
+u_int
+cipher_get_number(const struct sshcipher *c)
{
return (c->number);
}
u_int
-cipher_is_cbc(const Cipher *c)
+cipher_is_cbc(const struct sshcipher *c)
{
- return (c->cbc_mode);
+ return (c->flags & CFLAG_CBC) != 0;
}
u_int
return mask;
}
-Cipher *
+const struct sshcipher *
cipher_by_name(const char *name)
{
- Cipher *c;
+ const struct sshcipher *c;
for (c = ciphers; c->name != NULL; c++)
if (strcmp(c->name, name) == 0)
return c;
return NULL;
}
-Cipher *
+const struct sshcipher *
cipher_by_number(int id)
{
- Cipher *c;
+ const struct sshcipher *c;
for (c = ciphers; c->name != NULL; c++)
if (c->number == id)
return c;
int
ciphers_valid(const char *names)
{
- Cipher *c;
+ const struct sshcipher *c;
char *cipher_list, *cp;
char *p;
if (names == NULL || strcmp(names, "") == 0)
return 0;
- cipher_list = cp = xstrdup(names);
+ if ((cipher_list = cp = strdup(names)) == NULL)
+ return 0;
for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0';
(p = strsep(&cp, CIPHER_SEP))) {
c = cipher_by_name(p);
if (c == NULL || c->number != SSH_CIPHER_SSH2) {
- debug("bad cipher %s [%s]", p, names);
- xfree(cipher_list);
+ free(cipher_list);
return 0;
- } else {
- debug3("cipher ok: %s [%s]", p, names);
}
}
- debug3("ciphers ok: [%s]", names);
- xfree(cipher_list);
+ free(cipher_list);
return 1;
}
int
cipher_number(const char *name)
{
- Cipher *c;
+ const struct sshcipher *c;
if (name == NULL)
return -1;
for (c = ciphers; c->name != NULL; c++)
char *
cipher_name(int id)
{
- Cipher *c = cipher_by_number(id);
+ const struct sshcipher *c = cipher_by_number(id);
return (c==NULL) ? "<unknown>" : c->name;
}
-void
-cipher_init(CipherContext *cc, Cipher *cipher,
+const char *
+cipher_warning_message(const struct sshcipher_ctx *cc)
+{
+ if (cc == NULL || cc->cipher == NULL)
+ return NULL;
+ if (cc->cipher->number == SSH_CIPHER_DES)
+ return "use of DES is strongly discouraged due to "
+ "cryptographic weaknesses";
+ return NULL;
+}
+
+int
+cipher_init(struct sshcipher_ctx *cc, const struct sshcipher *cipher,
const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
int do_encrypt)
{
- static int dowarn = 1;
-#ifdef SSH_OLD_EVP
- EVP_CIPHER *type;
-#else
+#ifdef WITH_OPENSSL
+ int ret = SSH_ERR_INTERNAL_ERROR;
const EVP_CIPHER *type;
int klen;
-#endif
u_char *junk, *discard;
if (cipher->number == SSH_CIPHER_DES) {
- if (dowarn) {
- error("Warning: use of DES is strongly discouraged "
- "due to cryptographic weaknesses");
- dowarn = 0;
- }
if (keylen > 8)
keylen = 8;
}
+#endif
cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
+ cc->encrypt = do_encrypt;
- if (keylen < cipher->key_len)
- fatal("cipher_init: key length %d is insufficient for %s.",
- keylen, cipher->name);
- if (iv != NULL && ivlen < cipher->block_size)
- fatal("cipher_init: iv length %d is insufficient for %s.",
- ivlen, cipher->name);
- cc->cipher = cipher;
-
- type = (*cipher->evptype)();
+ if (keylen < cipher->key_len ||
+ (iv != NULL && ivlen < cipher_ivlen(cipher)))
+ return SSH_ERR_INVALID_ARGUMENT;
- EVP_CIPHER_CTX_init(&cc->evp);
-#ifdef SSH_OLD_EVP
- if (type->key_len > 0 && type->key_len != keylen) {
- debug("cipher_init: set keylen (%d -> %d)",
- type->key_len, keylen);
- type->key_len = keylen;
+ cc->cipher = cipher;
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
+ return chachapoly_init(&cc->cp_ctx, key, keylen);
+ }
+#ifndef WITH_OPENSSL
+ if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
+ aesctr_keysetup(&cc->ac_ctx, key, 8 * keylen, 8 * ivlen);
+ aesctr_ivsetup(&cc->ac_ctx, iv);
+ return 0;
}
- EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv,
- (do_encrypt == CIPHER_ENCRYPT));
+ if ((cc->cipher->flags & CFLAG_NONE) != 0)
+ return 0;
+ return SSH_ERR_INVALID_ARGUMENT;
#else
+ type = (*cipher->evptype)();
+ EVP_CIPHER_CTX_init(&cc->evp);
if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
- (do_encrypt == CIPHER_ENCRYPT)) == 0)
- fatal("cipher_init: EVP_CipherInit failed for %s",
- cipher->name);
+ (do_encrypt == CIPHER_ENCRYPT)) == 0) {
+ ret = SSH_ERR_LIBCRYPTO_ERROR;
+ goto bad;
+ }
+ if (cipher_authlen(cipher) &&
+ !EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_IV_FIXED,
+ -1, (u_char *)iv)) {
+ ret = SSH_ERR_LIBCRYPTO_ERROR;
+ goto bad;
+ }
klen = EVP_CIPHER_CTX_key_length(&cc->evp);
if (klen > 0 && keylen != (u_int)klen) {
- 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);
+ if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) {
+ ret = SSH_ERR_LIBCRYPTO_ERROR;
+ goto bad;
+ }
+ }
+ if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) {
+ ret = SSH_ERR_LIBCRYPTO_ERROR;
+ goto bad;
}
- if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
- fatal("cipher_init: EVP_CipherInit: set key failed for %s",
- cipher->name);
-#endif
if (cipher->discard_len > 0) {
- junk = xmalloc(cipher->discard_len);
- discard = xmalloc(cipher->discard_len);
- if (EVP_Cipher(&cc->evp, discard, junk,
- cipher->discard_len) == 0)
- fatal("evp_crypt: EVP_Cipher failed during discard");
- memset(discard, 0, cipher->discard_len);
- xfree(junk);
- xfree(discard);
+ if ((junk = malloc(cipher->discard_len)) == NULL ||
+ (discard = malloc(cipher->discard_len)) == NULL) {
+ if (junk != NULL)
+ free(junk);
+ ret = SSH_ERR_ALLOC_FAIL;
+ goto bad;
+ }
+ ret = EVP_Cipher(&cc->evp, discard, junk, cipher->discard_len);
+ explicit_bzero(discard, cipher->discard_len);
+ free(junk);
+ free(discard);
+ if (ret != 1) {
+ ret = SSH_ERR_LIBCRYPTO_ERROR;
+ bad:
+ EVP_CIPHER_CTX_cleanup(&cc->evp);
+ return ret;
+ }
}
+#endif
+ return 0;
}
-void
-cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
+/*
+ * cipher_crypt() operates as following:
+ * Copy 'aadlen' bytes (without en/decryption) from 'src' to 'dest'.
+ * Theses bytes are treated as additional authenticated data for
+ * authenticated encryption modes.
+ * En/Decrypt 'len' bytes at offset 'aadlen' from 'src' to 'dest'.
+ * Use 'authlen' bytes at offset 'len'+'aadlen' as the authentication tag.
+ * This tag is written on encryption and verified on decryption.
+ * Both 'aadlen' and 'authlen' can be set to 0.
+ */
+int
+cipher_crypt(struct sshcipher_ctx *cc, u_int seqnr, u_char *dest,
+ const u_char *src, u_int len, u_int aadlen, u_int authlen)
{
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
+ return chachapoly_crypt(&cc->cp_ctx, seqnr, dest, src,
+ len, aadlen, authlen, cc->encrypt);
+ }
+#ifndef WITH_OPENSSL
+ if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
+ if (aadlen)
+ memcpy(dest, src, aadlen);
+ aesctr_encrypt_bytes(&cc->ac_ctx, src + aadlen,
+ dest + aadlen, len);
+ return 0;
+ }
+ if ((cc->cipher->flags & CFLAG_NONE) != 0) {
+ memcpy(dest, src, aadlen + len);
+ return 0;
+ }
+ return SSH_ERR_INVALID_ARGUMENT;
+#else
+ if (authlen) {
+ u_char lastiv[1];
+
+ if (authlen != cipher_authlen(cc->cipher))
+ return SSH_ERR_INVALID_ARGUMENT;
+ /* increment IV */
+ if (!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_IV_GEN,
+ 1, lastiv))
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ /* set tag on decyption */
+ if (!cc->encrypt &&
+ !EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_SET_TAG,
+ authlen, (u_char *)src + aadlen + len))
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ }
+ if (aadlen) {
+ if (authlen &&
+ EVP_Cipher(&cc->evp, NULL, (u_char *)src, aadlen) < 0)
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ memcpy(dest, src, aadlen);
+ }
if (len % cc->cipher->block_size)
- fatal("cipher_encrypt: bad plaintext length %d", len);
- if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
- fatal("evp_crypt: EVP_Cipher failed");
+ return SSH_ERR_INVALID_ARGUMENT;
+ if (EVP_Cipher(&cc->evp, dest + aadlen, (u_char *)src + aadlen,
+ len) < 0)
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ if (authlen) {
+ /* compute tag (on encrypt) or verify tag (on decrypt) */
+ if (EVP_Cipher(&cc->evp, NULL, NULL, 0) < 0)
+ return cc->encrypt ?
+ SSH_ERR_LIBCRYPTO_ERROR : SSH_ERR_MAC_INVALID;
+ if (cc->encrypt &&
+ !EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_GET_TAG,
+ authlen, dest + aadlen + len))
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ }
+ return 0;
+#endif
}
-void
-cipher_cleanup(CipherContext *cc)
+/* Extract the packet length, including any decryption necessary beforehand */
+int
+cipher_get_length(struct sshcipher_ctx *cc, u_int *plenp, u_int seqnr,
+ const u_char *cp, u_int len)
{
- if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
- error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
+ return chachapoly_get_length(&cc->cp_ctx, plenp, seqnr,
+ cp, len);
+ if (len < 4)
+ return SSH_ERR_MESSAGE_INCOMPLETE;
+ *plenp = get_u32(cp);
+ return 0;
+}
+
+int
+cipher_cleanup(struct sshcipher_ctx *cc)
+{
+ if (cc == NULL || cc->cipher == NULL)
+ return 0;
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
+ explicit_bzero(&cc->cp_ctx, sizeof(cc->cp_ctx));
+ else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
+ explicit_bzero(&cc->ac_ctx, sizeof(cc->ac_ctx));
+#ifdef WITH_OPENSSL
+ else if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
+ return SSH_ERR_LIBCRYPTO_ERROR;
+#endif
+ return 0;
}
/*
* Selects the cipher, and keys if by computing the MD5 checksum of the
* passphrase and using the resulting 16 bytes as the key.
*/
-
-void
-cipher_set_key_string(CipherContext *cc, Cipher *cipher,
+int
+cipher_set_key_string(struct sshcipher_ctx *cc, const struct sshcipher *cipher,
const char *passphrase, int do_encrypt)
{
- MD5_CTX md;
u_char digest[16];
+ int r = SSH_ERR_INTERNAL_ERROR;
- MD5_Init(&md);
- MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase));
- MD5_Final(digest, &md);
+ if ((r = ssh_digest_memory(SSH_DIGEST_MD5,
+ passphrase, strlen(passphrase),
+ digest, sizeof(digest))) != 0)
+ goto out;
- cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
-
- memset(digest, 0, sizeof(digest));
- memset(&md, 0, sizeof(md));
+ r = cipher_init(cc, cipher, digest, 16, NULL, 0, do_encrypt);
+ out:
+ explicit_bzero(digest, sizeof(digest));
+ return r;
}
/*
- * Exports an IV from the CipherContext required to export the key
+ * Exports an IV from the sshcipher_ctx required to export the key
* state back from the unprivileged child to the privileged parent
* process.
*/
-
int
-cipher_get_keyiv_len(const CipherContext *cc)
+cipher_get_keyiv_len(const struct sshcipher_ctx *cc)
{
- Cipher *c = cc->cipher;
- int ivlen;
+ const struct sshcipher *c = cc->cipher;
+ int ivlen = 0;
if (c->number == SSH_CIPHER_3DES)
ivlen = 24;
+ else if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
+ ivlen = 0;
+ else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
+ ivlen = sizeof(cc->ac_ctx.ctr);
+#ifdef WITH_OPENSSL
else
ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp);
+#endif /* WITH_OPENSSL */
return (ivlen);
}
-void
-cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len)
+int
+cipher_get_keyiv(struct sshcipher_ctx *cc, u_char *iv, u_int len)
{
- Cipher *c = cc->cipher;
- int evplen;
+ const struct sshcipher *c = cc->cipher;
+#ifdef WITH_OPENSSL
+ int evplen;
+#endif
+
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
+ if (len != 0)
+ return SSH_ERR_INVALID_ARGUMENT;
+ return 0;
+ }
+ if ((cc->cipher->flags & CFLAG_AESCTR) != 0) {
+ if (len != sizeof(cc->ac_ctx.ctr))
+ return SSH_ERR_INVALID_ARGUMENT;
+ memcpy(iv, cc->ac_ctx.ctr, len);
+ return 0;
+ }
+ if ((cc->cipher->flags & CFLAG_NONE) != 0)
+ return 0;
switch (c->number) {
+#ifdef WITH_OPENSSL
case SSH_CIPHER_SSH2:
case SSH_CIPHER_DES:
case SSH_CIPHER_BLOWFISH:
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
- if (evplen <= 0)
- return;
+ if (evplen == 0)
+ return 0;
+ else if (evplen < 0)
+ return SSH_ERR_LIBCRYPTO_ERROR;
if ((u_int)evplen != len)
- fatal("%s: wrong iv length %d != %d", __func__,
- evplen, len);
-#ifdef USE_BUILTIN_RIJNDAEL
- if (c->evptype == evp_rijndael)
- ssh_rijndael_iv(&cc->evp, 0, iv, len);
- else
-#endif
+ return SSH_ERR_INVALID_ARGUMENT;
+#ifndef OPENSSL_HAVE_EVPCTR
if (c->evptype == evp_aes_128_ctr)
ssh_aes_ctr_iv(&cc->evp, 0, iv, len);
else
+#endif
+ if (cipher_authlen(c)) {
+ if (!EVP_CIPHER_CTX_ctrl(&cc->evp, EVP_CTRL_GCM_IV_GEN,
+ len, iv))
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ } else
memcpy(iv, cc->evp.iv, len);
break;
+#endif
+#ifdef WITH_SSH1
case SSH_CIPHER_3DES:
- ssh1_3des_iv(&cc->evp, 0, iv, 24);
- break;
+ return ssh1_3des_iv(&cc->evp, 0, iv, 24);
+#endif
default:
- fatal("%s: bad cipher %d", __func__, c->number);
+ return SSH_ERR_INVALID_ARGUMENT;
}
+ return 0;
}
-void
-cipher_set_keyiv(CipherContext *cc, u_char *iv)
+int
+cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv)
{
- Cipher *c = cc->cipher;
- int evplen = 0;
+ const struct sshcipher *c = cc->cipher;
+#ifdef WITH_OPENSSL
+ int evplen = 0;
+#endif
+
+ if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
+ return 0;
+ if ((cc->cipher->flags & CFLAG_NONE) != 0)
+ return 0;
switch (c->number) {
+#ifdef WITH_OPENSSL
case SSH_CIPHER_SSH2:
case SSH_CIPHER_DES:
case SSH_CIPHER_BLOWFISH:
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp);
- if (evplen == 0)
- return;
-#ifdef USE_BUILTIN_RIJNDAEL
- if (c->evptype == evp_rijndael)
- ssh_rijndael_iv(&cc->evp, 1, iv, evplen);
- else
-#endif
- if (c->evptype == evp_aes_128_ctr)
- ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen);
- else
+ if (evplen <= 0)
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ if (cipher_authlen(c)) {
+ /* XXX iv arg is const, but EVP_CIPHER_CTX_ctrl isn't */
+ if (!EVP_CIPHER_CTX_ctrl(&cc->evp,
+ EVP_CTRL_GCM_SET_IV_FIXED, -1, (void *)iv))
+ return SSH_ERR_LIBCRYPTO_ERROR;
+ } else
memcpy(cc->evp.iv, iv, evplen);
break;
+#endif
+#ifdef WITH_SSH1
case SSH_CIPHER_3DES:
- ssh1_3des_iv(&cc->evp, 1, iv, 24);
- break;
+ return ssh1_3des_iv(&cc->evp, 1, (u_char *)iv, 24);
+#endif
default:
- fatal("%s: bad cipher %d", __func__, c->number);
+ return SSH_ERR_INVALID_ARGUMENT;
}
+ return 0;
}
-#if OPENSSL_VERSION_NUMBER < 0x00907000L
-#define EVP_X_STATE(evp) &(evp).c
-#define EVP_X_STATE_LEN(evp) sizeof((evp).c)
-#else
+#ifdef WITH_OPENSSL
#define EVP_X_STATE(evp) (evp).cipher_data
#define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size
#endif
int
-cipher_get_keycontext(const CipherContext *cc, u_char *dat)
+cipher_get_keycontext(const struct sshcipher_ctx *cc, u_char *dat)
{
- Cipher *c = cc->cipher;
+#ifdef WITH_OPENSSL
+ const struct sshcipher *c = cc->cipher;
int plen = 0;
- if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
+ if (c->evptype == EVP_rc4) {
plen = EVP_X_STATE_LEN(cc->evp);
if (dat == NULL)
return (plen);
memcpy(dat, EVP_X_STATE(cc->evp), plen);
}
return (plen);
+#else
+ return 0;
+#endif
}
void
-cipher_set_keycontext(CipherContext *cc, u_char *dat)
+cipher_set_keycontext(struct sshcipher_ctx *cc, const u_char *dat)
{
- Cipher *c = cc->cipher;
+#ifdef WITH_OPENSSL
+ const struct sshcipher *c = cc->cipher;
int plen;
- if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) {
+ if (c->evptype == EVP_rc4) {
plen = EVP_X_STATE_LEN(cc->evp);
memcpy(EVP_X_STATE(cc->evp), dat, plen);
}
+#endif
}
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