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upstream: make Chacha20-POLY1305 context struct opaque; ok tb@ as 

part of a larger diff at a2k20

OpenBSD-Commit-ID: a4609b7263284f95c9417ef60ed7cdbb7bf52cfd
This commit is contained in:
djm@openbsd.org 2020-04-03 04:27:03 +00:00 committed by Damien Miller
parent ebd29e9012
commit eba523f0a1
4 changed files with 37 additions and 22 deletions
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25
cipher-chachapoly.c
View File

@ -14,7 +14,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $OpenBSD: cipher-chachapoly.c,v 1.8 2016/08/03 05:41:57 djm Exp $ */
/* $OpenBSD: cipher-chachapoly.c,v 1.9 2020/04/03 04:27:03 djm Exp $ */
#include "includes.h"
@ -28,15 +28,28 @@
#include "ssherr.h"
#include "cipher-chachapoly.h"
int
chachapoly_init(struct chachapoly_ctx *ctx,
const u_char *key, u_int keylen)
struct chachapoly_ctx {
struct chacha_ctx main_ctx, header_ctx;
};
struct chachapoly_ctx *
chachapoly_new(const u_char *key, u_int keylen)
{
struct chachapoly_ctx *ctx;
if (keylen != (32 + 32)) /* 2 x 256 bit keys */
return SSH_ERR_INVALID_ARGUMENT;
return NULL;
if ((ctx = calloc(1, sizeof(*ctx))) == NULL)
return NULL;
chacha_keysetup(&ctx->main_ctx, key, 256);
chacha_keysetup(&ctx->header_ctx, key + 32, 256);
return 0;
return ctx;
}
void
chachapoly_free(struct chachapoly_ctx *cpctx)
{
freezero(cpctx, sizeof(*cpctx));
}
/*

13
cipher-chachapoly.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cipher-chachapoly.h,v 1.4 2014/06/24 01:13:21 djm Exp $ */
/* $OpenBSD: cipher-chachapoly.h,v 1.5 2020/04/03 04:27:03 djm Exp $ */
/*
* Copyright (c) Damien Miller 2013 <djm@mindrot.org>
@ -24,13 +24,12 @@
#define CHACHA_KEYLEN 32 /* Only 256 bit keys used here */
struct chachapoly_ctx {
struct chacha_ctx main_ctx, header_ctx;
};
struct chachapoly_ctx;
struct chachapoly_ctx *chachapoly_new(const u_char *key, u_int keylen)
__attribute__((__bounded__(__buffer__, 1, 2)));
void chachapoly_free(struct chachapoly_ctx *cpctx);
int chachapoly_init(struct chachapoly_ctx *cpctx,
const u_char *key, u_int keylen)
__attribute__((__bounded__(__buffer__, 2, 3)));
int chachapoly_crypt(struct chachapoly_ctx *cpctx, u_int seqnr,
u_char *dest, const u_char *src, u_int len, u_int aadlen, u_int authlen,
int do_encrypt);

18
cipher.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cipher.c,v 1.116 2020/03/13 03:17:07 djm Exp $ */
/* $OpenBSD: cipher.c,v 1.117 2020/04/03 04:27:03 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -59,7 +59,7 @@ struct sshcipher_ctx {
int plaintext;
int encrypt;
EVP_CIPHER_CTX *evp;
struct chachapoly_ctx cp_ctx; /* XXX union with evp? */
struct chachapoly_ctx *cp_ctx;
struct aesctr_ctx ac_ctx; /* XXX union with evp? */
const struct sshcipher *cipher;
};
@ -273,7 +273,8 @@ cipher_init(struct sshcipher_ctx **ccp, const struct sshcipher *cipher,
cc->cipher = cipher;
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
ret = chachapoly_init(&cc->cp_ctx, key, keylen);
cc->cp_ctx = chachapoly_new(key, keylen);
ret = cc->cp_ctx != NULL ? 0 : SSH_ERR_INVALID_ARGUMENT;
goto out;
}
if ((cc->cipher->flags & CFLAG_NONE) != 0) {
@ -349,7 +350,7 @@ 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,
return chachapoly_crypt(cc->cp_ctx, seqnr, dest, src,
len, aadlen, authlen, cc->encrypt);
}
if ((cc->cipher->flags & CFLAG_NONE) != 0) {
@ -412,7 +413,7 @@ cipher_get_length(struct sshcipher_ctx *cc, u_int *plenp, u_int seqnr,
const u_char *cp, u_int len)
{
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
return chachapoly_get_length(&cc->cp_ctx, plenp, seqnr,
return chachapoly_get_length(cc->cp_ctx, plenp, seqnr,
cp, len);
if (len < 4)
return SSH_ERR_MESSAGE_INCOMPLETE;
@ -425,9 +426,10 @@ cipher_free(struct sshcipher_ctx *cc)
{
if (cc == NULL)
return;
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
explicit_bzero(&cc->cp_ctx, sizeof(cc->cp_ctx));
else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0) {
chachapoly_free(cc->cp_ctx);
cc->cp_ctx = NULL;
} else if ((cc->cipher->flags & CFLAG_AESCTR) != 0)
explicit_bzero(&cc->ac_ctx, sizeof(cc->ac_ctx));
#ifdef WITH_OPENSSL
EVP_CIPHER_CTX_free(cc->evp);

3
regress/Makefile
View File

@ -1,4 +1,4 @@
# $OpenBSD: Makefile,v 1.106 2020/01/31 23:25:08 djm Exp $
# $OpenBSD: Makefile,v 1.107 2020/04/03 02:33:31 dtucker Exp $
tests: prep file-tests t-exec unit
@ -66,6 +66,7 @@ LTESTS= connect \
cfgparse \
cfgmatch \
cfgmatchlisten \
percent \
addrmatch \
localcommand \
forcecommand \