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Code

Use openssl's version of sha3 when available.

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Part of 28837.
This commit is contained in:
Nick Mathewson 2018-12-13 13:25:30 -05:00
parent 77712a5fa2
commit c393171403
4 changed files with 158 additions and 14 deletions
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32
configure.ac
View File

@ -947,21 +947,24 @@ AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])
dnl OpenSSL functions which we might not have. In theory, we could just
dnl check the openssl version number, but in practice that gets pretty
dnl confusing with LibreSSL, OpenSSL, and various distributions' patches
dnl to them.
AC_CHECK_FUNCS([ \
ERR_load_KDF_strings \
SSL_SESSION_get_master_key \
SSL_get_server_random \
SSL_get_client_ciphers \
SSL_get_client_random \
SSL_CTX_set1_groups_list \
EVP_PBE_scrypt \
EVP_sha3_256 \
SSL_CIPHER_find \
SSL_CTX_set_security_level \
TLS_method
SSL_CTX_set1_groups_list \
SSL_CTX_set_security_level \
SSL_SESSION_get_master_key \
SSL_get_client_ciphers \
SSL_get_client_random \
SSL_get_server_random \
TLS_method \
])
dnl Check if OpenSSL has scrypt implementation.
AC_CHECK_FUNCS([ EVP_PBE_scrypt ])
dnl Check if OpenSSL structures are opaque
AC_CHECK_MEMBERS([SSL.state], , ,
[#include <openssl/ssl.h>
@ -973,6 +976,15 @@ AC_CHECK_SIZEOF(SHA_CTX, , [AC_INCLUDES_DEFAULT()
fi # enable_nss
dnl We will someday make KECCAK_TINY optional, but for now we still need
dnl it for SHAKE, since OpenSSL's SHAKE can't be squeezed more than
dnl once. See comment in the definition of crypto_xof_t.
dnl AM_CONDITIONAL(BUILD_KECCAK_TINY,
dnl test "x$ac_cv_func_EVP_sha3_256" != "xyes")
AM_CONDITIONAL(BUILD_KECCAK_TINY, true)
dnl ======================================================================
dnl Can we use KIST?

2
src/ext/include.am
View File

@ -143,6 +143,7 @@ noinst_HEADERS += $(ED25519_DONNA_HDRS)
LIBED25519_DONNA=src/ext/ed25519/donna/libed25519_donna.a
noinst_LIBRARIES += $(LIBED25519_DONNA)
if BUILD_KECCAK_TINY
src_ext_keccak_tiny_libkeccak_tiny_a_CFLAGS=\
@CFLAGS_CONSTTIME@
@ -156,6 +157,7 @@ noinst_HEADERS += $(LIBKECCAK_TINY_HDRS)
LIBKECCAK_TINY=src/ext/keccak-tiny/libkeccak-tiny.a
noinst_LIBRARIES += $(LIBKECCAK_TINY)
endif
EXTRA_DIST += \
src/ext/timeouts/bench/bench-add.lua \

135
src/lib/crypt_ops/crypto_digest.c
View File

@ -37,6 +37,12 @@ DISABLE_GCC_WARNING(redundant-decls)
#include <openssl/sha.h>
ENABLE_GCC_WARNING(redundant-decls)
#ifdef HAVE_EVP_SHA3_256
#define OPENSSL_HAS_SHA3
#include <openssl/evp.h>
#endif
#endif
#ifdef ENABLE_NSS
@ -150,8 +156,13 @@ crypto_digest256(char *digest, const char *m, size_t len,
ret = (SHA256((const uint8_t*)m,len,(uint8_t*)digest) != NULL);
#endif
} else {
#ifdef OPENSSL_HAS_SHA3
unsigned int dlen = DIGEST256_LEN;
ret = EVP_Digest(m, len, (uint8_t*)digest, &dlen, EVP_sha3_256(), NULL);
#else
ret = (sha3_256((uint8_t *)digest, DIGEST256_LEN,(const uint8_t *)m, len)
> -1);
#endif
}
if (!ret)
@ -179,8 +190,13 @@ crypto_digest512(char *digest, const char *m, size_t len,
!= NULL);
#endif
} else {
#ifdef OPENSSL_HAS_SHA3
unsigned int dlen = DIGEST512_LEN;
ret = EVP_Digest(m, len, (uint8_t*)digest, &dlen, EVP_sha3_512(), NULL);
#else
ret = (sha3_512((uint8_t*)digest, DIGEST512_LEN, (const uint8_t*)m, len)
> -1);
#endif
}
if (!ret)
@ -282,7 +298,11 @@ struct crypto_digest_t {
SHA256_CTX sha2; /**< state for SHA256 */
SHA512_CTX sha512; /**< state for SHA512 */
#endif
#ifdef OPENSSL_HAS_SHA3
EVP_MD_CTX *md;
#else
keccak_state sha3; /**< state for SHA3-[256,512] */
#endif
} d;
};
@ -325,9 +345,15 @@ crypto_digest_alloc_bytes(digest_algorithm_t alg)
case DIGEST_SHA512:
return END_OF_FIELD(d.sha512);
#endif
case DIGEST_SHA3_256:
#ifdef OPENSSL_HAS_SHA3
case DIGEST_SHA3_256: /* Fall through */
case DIGEST_SHA3_512:
return END_OF_FIELD(d.md);
#else
case DIGEST_SHA3_256: /* Fall through */
case DIGEST_SHA3_512:
return END_OF_FIELD(d.sha3);
#endif
default:
tor_assert(0); // LCOV_EXCL_LINE
return 0; // LCOV_EXCL_LINE
@ -373,12 +399,29 @@ crypto_digest_new_internal(digest_algorithm_t algorithm)
SHA512_Init(&r->d.sha512);
break;
#endif
#ifdef OPENSSL_HAS_SHA3
case DIGEST_SHA3_256:
r->d.md = EVP_MD_CTX_new();
if (!EVP_DigestInit(r->d.md, EVP_sha3_256())) {
crypto_digest_free(r);
return NULL;
}
break;
case DIGEST_SHA3_512:
r->d.md = EVP_MD_CTX_new();
if (!EVP_DigestInit(r->d.md, EVP_sha3_512())) {
crypto_digest_free(r);
return NULL;
}
break;
#else
case DIGEST_SHA3_256:
keccak_digest_init(&r->d.sha3, 256);
break;
case DIGEST_SHA3_512:
keccak_digest_init(&r->d.sha3, 512);
break;
#endif
default:
tor_assert_unreached();
}
@ -427,6 +470,14 @@ crypto_digest_free_(crypto_digest_t *digest)
if (library_supports_digest(digest->algorithm)) {
PK11_DestroyContext(digest->d.ctx, PR_TRUE);
}
#endif
#ifdef OPENSSL_HAS_SHA3
if (digest->algorithm == DIGEST_SHA3_256 ||
digest->algorithm == DIGEST_SHA3_512) {
if (digest->d.md) {
EVP_MD_CTX_free(digest->d.md);
}
}
#endif
size_t bytes = crypto_digest_alloc_bytes(digest->algorithm);
memwipe(digest, 0, bytes);
@ -471,10 +522,19 @@ crypto_digest_add_bytes(crypto_digest_t *digest, const char *data,
SHA512_Update(&digest->d.sha512, (void*)data, len);
break;
#endif
#ifdef OPENSSL_HAS_SHA3
case DIGEST_SHA3_256: /* FALLSTHROUGH */
case DIGEST_SHA3_512: {
int r = EVP_DigestUpdate(digest->d.md, data, len);
tor_assert(r);
}
break;
#else
case DIGEST_SHA3_256: /* FALLSTHROUGH */
case DIGEST_SHA3_512:
keccak_digest_update(&digest->d.sha3, (const uint8_t *)data, len);
break;
#endif
default:
/* LCOV_EXCL_START */
tor_fragile_assert();
@ -499,12 +559,24 @@ crypto_digest_get_digest(crypto_digest_t *digest,
tor_assert(out);
tor_assert(out_len <= crypto_digest_algorithm_get_length(digest->algorithm));
/* The SHA-3 code handles copying into a temporary ctx, and also can handle
* short output buffers by truncating appropriately. */
if (digest->algorithm == DIGEST_SHA3_256 ||
digest->algorithm == DIGEST_SHA3_512) {
#ifdef OPENSSL_HAS_SHA3
unsigned dlen = (unsigned)
crypto_digest_algorithm_get_length(digest->algorithm);
EVP_MD_CTX *tmp = EVP_MD_CTX_new();
EVP_MD_CTX_copy(tmp, digest->d.md);
memset(r, 0xff, sizeof(r));
int res = EVP_DigestFinal(tmp, r, &dlen);
EVP_MD_CTX_free(tmp);
tor_assert(res == 1);
goto done;
#else
/* Tiny-Keccak handles copying into a temporary ctx, and also can handle
* short output buffers by truncating appropriately. */
keccak_digest_sum(&digest->d.sha3, (uint8_t *)out, out_len);
return;
#endif
}
#ifdef ENABLE_NSS
@ -550,6 +622,10 @@ crypto_digest_get_digest(crypto_digest_t *digest,
//LCOV_EXCL_STOP
}
#endif
#ifdef OPENSSL_HAS_SHA3
done:
#endif
memcpy(out, r, out_len);
memwipe(r, 0, sizeof(r));
}
@ -570,6 +646,13 @@ crypto_digest_dup(const crypto_digest_t *digest)
if (library_supports_digest(digest->algorithm)) {
result->d.ctx = PK11_CloneContext(digest->d.ctx);
}
#endif
#ifdef OPENSSL_HAS_SHA3
if (digest->algorithm == DIGEST_SHA3_256 ||
digest->algorithm == DIGEST_SHA3_512) {
result->d.md = EVP_MD_CTX_new();
EVP_MD_CTX_copy(result->d.md, digest->d.md);
}
#endif
return result;
}
@ -637,6 +720,15 @@ crypto_digest_assign(crypto_digest_t *into,
return;
}
#endif
#ifdef OPENSSL_HAS_SHA3
if (from->algorithm == DIGEST_SHA3_256 ||
from->algorithm == DIGEST_SHA3_512) {
EVP_MD_CTX_copy(into->d.md, from->d.md);
return;
}
#endif
memcpy(into,from,alloc_bytes);
}
@ -779,7 +871,23 @@ crypto_mac_sha3_256(uint8_t *mac_out, size_t len_out,
/** Internal state for a eXtendable-Output Function (XOF). */
struct crypto_xof_t {
#ifdef OPENSSL_HAS_SHAKE3_EVP
/* XXXX We can't enable this yet, because OpenSSL's
* DigestFinalXOF function can't be called repeatedly on the same
* XOF.
*
* We could in theory use the undocumented SHA3_absorb and SHA3_squeeze
* functions, but let's not mess with undocumented OpenSSL internals any
* more than we have to.
*
* We could also revise our XOF code so that it only allows a single
* squeeze operation; we don't require streaming squeeze operations
* outside the tests yet.
*/
EVP_MD_CTX *ctx;
#else
keccak_state s;
#endif
};
/** Allocate a new XOF object backed by SHAKE-256. The security level
@ -792,7 +900,14 @@ crypto_xof_new(void)
{
crypto_xof_t *xof;
xof = tor_malloc(sizeof(crypto_xof_t));
#ifdef OPENSSL_HAS_SHAKE256
xof->ctx = EVP_MD_CTX_new();
tor_assert(xof->ctx);
int r = EVP_DigestInit(xof->ctx, EVP_shake256());
tor_assert(r == 1);
#else
keccak_xof_init(&xof->s, 256);
#endif
return xof;
}
@ -803,8 +918,13 @@ crypto_xof_new(void)
void
crypto_xof_add_bytes(crypto_xof_t *xof, const uint8_t *data, size_t len)
{
#ifdef OPENSSL_HAS_SHAKE256
int r = EVP_DigestUpdate(xof->ctx, data, len);
tor_assert(r == 1);
#else
int i = keccak_xof_absorb(&xof->s, data, len);
tor_assert(i == 0);
#endif
}
/** Squeeze bytes out of a XOF object. Calling this routine will render
@ -813,8 +933,13 @@ crypto_xof_add_bytes(crypto_xof_t *xof, const uint8_t *data, size_t len)
void
crypto_xof_squeeze_bytes(crypto_xof_t *xof, uint8_t *out, size_t len)
{
#ifdef OPENSSL_HAS_SHAKE256
int r = EVP_DigestFinalXOF(xof->ctx, out, len);
tor_assert(r == 1);
#else
int i = keccak_xof_squeeze(&xof->s, out, len);
tor_assert(i == 0);
#endif
}
/** Cleanse and deallocate a XOF object. */
@ -823,6 +948,10 @@ crypto_xof_free_(crypto_xof_t *xof)
{
if (!xof)
return;
#ifdef OPENSSL_HAS_SHAKE256
if (xof->ctx)
EVP_MD_CTX_free(xof->ctx);
#endif
memwipe(xof, 0, sizeof(crypto_xof_t));
tor_free(xof);
}

3
src/test/test_crypto.c
View File

@ -1178,8 +1178,9 @@ test_crypto_sha3_xof(void *arg)
tt_assert(xof);
for (size_t i = 0; i < sizeof(msg); i++)
crypto_xof_add_bytes(xof, msg + i, 1);
for (size_t i = 0; i < sizeof(out); i++)
for (size_t i = 0; i < sizeof(out); i++) {
crypto_xof_squeeze_bytes(xof, out + i, 1);
}
test_memeq_hex(out, squeezed_hex);
done: