- djm@cvs.openbsd.org 2014/06/24 01:13:21

     [Makefile.in auth-bsdauth.c auth-chall.c auth-options.c auth-rsa.c
     [auth2-none.c auth2-pubkey.c authfile.c authfile.h cipher-3des1.c
     [cipher-chachapoly.c cipher-chachapoly.h cipher.c cipher.h
     [digest-libc.c digest-openssl.c digest.h dns.c entropy.c hmac.h
     [hostfile.c key.c key.h krl.c monitor.c packet.c rsa.c rsa.h
     [ssh-add.c ssh-agent.c ssh-dss.c ssh-ecdsa.c ssh-ed25519.c
     [ssh-keygen.c ssh-pkcs11-client.c ssh-pkcs11-helper.c ssh-pkcs11.c
     [ssh-rsa.c sshbuf-misc.c sshbuf.h sshconnect.c sshconnect1.c
     [sshconnect2.c sshd.c sshkey.c sshkey.h
     [openbsd-compat/openssl-compat.c openbsd-compat/openssl-compat.h]
     New key API: refactor key-related functions to be more library-like,
     existing API is offered as a set of wrappers.

     with and ok markus@

     Thanks also to Ben Hawkes, David Tomaschik, Ivan Fratric, Matthew
     Dempsky and Ron Bowes for a detailed review a few months ago.

     NB. This commit also removes portable OpenSSH support for OpenSSL
     <0.9.8e.

1 files changed, 14 insertions, 11 deletions

diff --git a/cipher-chachapoly.c b/cipher-chachapoly.c
index 251b94ec..0caccd29 100644
--- a/cipher-chachapoly.c
+++ b/cipher-chachapoly.c
@@ -14,7 +14,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $OpenBSD: cipher-chachapoly.c,v 1.4 2014/01/31 16:39:19 tedu Exp $ */
+/* $OpenBSD: cipher-chachapoly.c,v 1.5 2014/06/24 01:13:21 djm Exp $ */
 
 #include "includes.h"
 
@@ -24,16 +24,18 @@
 #include <stdio.h>  /* needed for misc.h */
 
 #include "log.h"
-#include "misc.h"
+#include "sshbuf.h"
+#include "ssherr.h"
 #include "cipher-chachapoly.h"
 
-void chachapoly_init(struct chachapoly_ctx *ctx,
+int chachapoly_init(struct chachapoly_ctx *ctx,
     const u_char *key, u_int keylen)
 {
 	if (keylen != (32 + 32)) /* 2 x 256 bit keys */
-		fatal("%s: invalid keylen %u", __func__, keylen);
+		return SSH_ERR_INVALID_ARGUMENT;
 	chacha_keysetup(&ctx->main_ctx, key, 256);
 	chacha_keysetup(&ctx->header_ctx, key + 32, 256);
+	return 0;
 }
 
 /*
@@ -52,14 +54,14 @@ chachapoly_crypt(struct chachapoly_ctx *ctx, u_int seqnr, u_char *dest,
 	u_char seqbuf[8];
 	const u_char one[8] = { 1, 0, 0, 0, 0, 0, 0, 0 }; /* NB little-endian */
 	u_char expected_tag[POLY1305_TAGLEN], poly_key[POLY1305_KEYLEN];
-	int r = -1;
+	int r = SSH_ERR_INTERNAL_ERROR;
 
 	/*
 	 * Run ChaCha20 once to generate the Poly1305 key. The IV is the
 	 * packet sequence number.
 	 */
 	memset(poly_key, 0, sizeof(poly_key));
-	put_u64(seqbuf, seqnr);
+	POKE_U64(seqbuf, seqnr);
 	chacha_ivsetup(&ctx->main_ctx, seqbuf, NULL);
 	chacha_encrypt_bytes(&ctx->main_ctx,
 	    poly_key, poly_key, sizeof(poly_key));
@@ -71,8 +73,10 @@ chachapoly_crypt(struct chachapoly_ctx *ctx, u_int seqnr, u_char *dest,
 		const u_char *tag = src + aadlen + len;
 
 		poly1305_auth(expected_tag, src, aadlen + len, poly_key);
-		if (timingsafe_bcmp(expected_tag, tag, POLY1305_TAGLEN) != 0)
+		if (timingsafe_bcmp(expected_tag, tag, POLY1305_TAGLEN) != 0) {
+			r = SSH_ERR_MAC_INVALID;
 			goto out;
+		}
 	}
 	/* Crypt additional data */
 	if (aadlen) {
@@ -88,7 +92,6 @@ chachapoly_crypt(struct chachapoly_ctx *ctx, u_int seqnr, u_char *dest,
 		    poly_key);
 	}
 	r = 0;
-
  out:
 	explicit_bzero(expected_tag, sizeof(expected_tag));
 	explicit_bzero(seqbuf, sizeof(seqbuf));
@@ -104,11 +107,11 @@ chachapoly_get_length(struct chachapoly_ctx *ctx,
 	u_char buf[4], seqbuf[8];
 
 	if (len < 4)
-		return -1; /* Insufficient length */
-	put_u64(seqbuf, seqnr);
+		return SSH_ERR_MESSAGE_INCOMPLETE;
+	POKE_U64(seqbuf, seqnr);
 	chacha_ivsetup(&ctx->header_ctx, seqbuf, NULL);
 	chacha_encrypt_bytes(&ctx->header_ctx, cp, buf, 4);
-	*plenp = get_u32(buf);
+	*plenp = PEEK_U32(buf);
 	return 0;
 }