diff options
| -rw-r--r-- | configure.ac | 10 | ||||
| -rw-r--r-- | defines.h | 7 | ||||
| -rw-r--r-- | kex.c | 2 | ||||
| -rw-r--r-- | kexsntrup761x25519.c | 32 | ||||
| -rw-r--r-- | sntrup761.c | 4 |
5 files changed, 54 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 35d1aca9..0cd1025f 100644 --- a/configure.ac +++ b/configure.ac @@ -297,6 +297,16 @@ typedef void foo(const char *, ...) __attribute__((format(printf, 1, 2)));]], [compiler does not accept __attribute__ on prototype args]) ] ) +AC_MSG_CHECKING([if compiler supports variable length arrays]) +AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[#include <stdlib.h>]], + [[ int i; for (i=0; i<3; i++){int a[i]; a[i-1]=0;} exit(0); ]])], + [ AC_MSG_RESULT([yes]) + AC_DEFINE(VARIABLE_LENGTH_ARRAYS, [1], + [compiler supports variable length arrays]) ], + [ AC_MSG_RESULT([no]) ] +) + if test "x$no_attrib_nonnull" != "x1" ; then AC_DEFINE([HAVE_ATTRIBUTE__NONNULL__], [1], [Have attribute nonnull]) fi @@ -894,4 +894,11 @@ struct winsize { # define USE_SYSTEM_GLOB #endif +/* + * sntrup761 uses variable length arrays, only enable if the compiler + * supports them. + */ +#ifdef VARIABLE_LENGTH_ARRAYS +# define USE_SNTRUP761X25519 1 +#endif #endif /* _DEFINES_H */ @@ -110,8 +110,10 @@ static const struct kexalg kexalgs[] = { #if defined(HAVE_EVP_SHA256) || !defined(WITH_OPENSSL) { KEX_CURVE25519_SHA256, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 }, { KEX_CURVE25519_SHA256_OLD, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 }, +#ifdef USE_SNTRUP761X25519 { KEX_SNTRUP761X25519_SHA512, KEX_KEM_SNTRUP761X25519_SHA512, 0, SSH_DIGEST_SHA512 }, +#endif #endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */ { NULL, 0, -1, -1}, }; diff --git a/kexsntrup761x25519.c b/kexsntrup761x25519.c index 3d5c6bdf..e3007fa2 100644 --- a/kexsntrup761x25519.c +++ b/kexsntrup761x25519.c @@ -25,6 +25,8 @@ #include "includes.h" +#ifdef USE_SNTRUP761X25519 + #include <sys/types.h> #include <stdio.h> @@ -217,3 +219,33 @@ kex_kem_sntrup761x25519_dec(struct kex *kex, sshbuf_free(buf); return r; } + +#else + +#include "ssherr.h" + +struct kex; +struct sshbuf; +struct sshkey; + +int +kex_kem_sntrup761x25519_keypair(struct kex *kex) +{ + return SSH_ERR_SIGN_ALG_UNSUPPORTED; +} + +int +kex_kem_sntrup761x25519_enc(struct kex *kex, + const struct sshbuf *client_blob, struct sshbuf **server_blobp, + struct sshbuf **shared_secretp) +{ + return SSH_ERR_SIGN_ALG_UNSUPPORTED; +} + +int +kex_kem_sntrup761x25519_dec(struct kex *kex, + const struct sshbuf *server_blob, struct sshbuf **shared_secretp) +{ + return SSH_ERR_SIGN_ALG_UNSUPPORTED; +} +#endif /* USE_SNTRUP761X25519 */ diff --git a/sntrup761.c b/sntrup761.c index 01f1bc34..c63e600f 100644 --- a/sntrup761.c +++ b/sntrup761.c @@ -10,6 +10,8 @@ #include "includes.h" +#ifdef USE_SNTRUP761X25519 + #include <string.h> #include "crypto_api.h" @@ -1268,4 +1270,4 @@ int crypto_kem_sntrup761_dec(unsigned char *k,const unsigned char *c,const unsig Decap(k,c,sk); return 0; } - +#endif /* USE_SNTRUP761X25519 */ |