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openssl-1_1/openssl-s390x-assembly-pack-accelerate-ECDSA.patch

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From 58c35587eacba090414522a6506cb86f2d0e91af Mon Sep 17 00:00:00 2001
From: Patrick Steuer <patrick.steuer@de.ibm.com>
Date: Thu, 11 Jul 2019 10:38:18 +0200
Subject: [PATCH 09206/10000] s390x assembly pack: accelerate ECDSA
for NIST P-256, P-384 and P-521 using KDSA instruction.
Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9348)
---
crypto/ec/ecp_s390x_nistp.c | 202 +++++++++++++++++++++++++++++++++++-
crypto/err/openssl.txt | 2 +
2 files changed, 200 insertions(+), 4 deletions(-)
Index: openssl-1.1.1e/crypto/ec/ecp_s390x_nistp.c
===================================================================
--- openssl-1.1.1e.orig/crypto/ec/ecp_s390x_nistp.c 2020-03-20 13:13:44.618571104 +0100
+++ openssl-1.1.1e/crypto/ec/ecp_s390x_nistp.c 2020-03-20 13:14:20.398759363 +0100
@@ -10,6 +10,7 @@
#include <stdlib.h>
#include <string.h>
#include <openssl/err.h>
+#include <openssl/rand.h>
#include "ec_local.h"
#include "s390x_arch.h"
@@ -28,6 +29,15 @@
#define S390X_OFF_SRC_Y(n) (3 * n)
#define S390X_OFF_SCALAR(n) (4 * n)
+/* Offsets of fields in KDSA parameter blocks */
+#define S390X_OFF_R(n) (0 * n)
+#define S390X_OFF_S(n) (1 * n)
+#define S390X_OFF_H(n) (2 * n)
+#define S390X_OFF_K(n) (3 * n)
+#define S390X_OFF_X(n) (3 * n)
+#define S390X_OFF_RN(n) (4 * n)
+#define S390X_OFF_Y(n) (4 * n)
+
static int ec_GFp_s390x_nistp_mul(const EC_GROUP *group, EC_POINT *r,
const BIGNUM *scalar,
size_t num, const EC_POINT *points[],
@@ -106,6 +116,163 @@ ret:
return rc;
}
+static ECDSA_SIG *ecdsa_s390x_nistp_sign_sig(const unsigned char *dgst,
+ int dgstlen,
+ const BIGNUM *kinv,
+ const BIGNUM *r,
+ EC_KEY *eckey,
+ unsigned int fc, int len)
+{
+ unsigned char param[S390X_SIZE_PARAM];
+ int ok = 0;
+ BIGNUM *k;
+ ECDSA_SIG *sig;
+ const EC_GROUP *group;
+ const BIGNUM *privkey;
+ int off;
+
+ group = EC_KEY_get0_group(eckey);
+ privkey = EC_KEY_get0_private_key(eckey);
+ if (group == NULL || privkey == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, EC_R_MISSING_PARAMETERS);
+ return NULL;
+ }
+
+ if (!EC_KEY_can_sign(eckey)) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG,
+ EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
+ return NULL;
+ }
+
+ k = BN_secure_new();
+ sig = ECDSA_SIG_new();
+ if (k == NULL || sig == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+ goto ret;
+ }
+
+ sig->r = BN_new();
+ sig->s = BN_new();
+ if (sig->r == NULL || sig->s == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_MALLOC_FAILURE);
+ goto ret;
+ }
+
+ memset(param, 0, sizeof(param));
+ off = len - (dgstlen > len ? len : dgstlen);
+ memcpy(param + S390X_OFF_H(len) + off, dgst, len - off);
+
+ if (BN_bn2binpad(privkey, param + S390X_OFF_K(len), len) == -1) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_BN_LIB);
+ goto ret;
+ }
+
+ if (r == NULL || kinv == NULL) {
+ /*
+ * Generate random k and copy to param param block. RAND_priv_bytes
+ * is used instead of BN_priv_rand_range or BN_generate_dsa_nonce
+ * because kdsa instruction constructs an in-range, invertible nonce
+ * internally implementing counter-measures for RNG weakness.
+ */
+ if (RAND_priv_bytes(param + S390X_OFF_RN(len), len) != 1) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG,
+ EC_R_RANDOM_NUMBER_GENERATION_FAILED);
+ goto ret;
+ }
+ } else {
+ /* Reconstruct k = (k^-1)^-1. */
+ if (ec_group_do_inverse_ord(group, k, kinv, NULL) == 0
+ || BN_bn2binpad(k, param + S390X_OFF_RN(len), len) == -1) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_BN_LIB);
+ goto ret;
+ }
+ /* Turns KDSA internal nonce-generation off. */
+ fc |= S390X_KDSA_D;
+ }
+
+ if (s390x_kdsa(fc, param, NULL, 0) != 0) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_ECDSA_LIB);
+ goto ret;
+ }
+
+ if (BN_bin2bn(param + S390X_OFF_R(len), len, sig->r) == NULL
+ || BN_bin2bn(param + S390X_OFF_S(len), len, sig->s) == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_SIGN_SIG, ERR_R_BN_LIB);
+ goto ret;
+ }
+
+ ok = 1;
+ret:
+ OPENSSL_cleanse(param, sizeof(param));
+ if (ok != 1) {
+ ECDSA_SIG_free(sig);
+ sig = NULL;
+ }
+ BN_clear_free(k);
+ return sig;
+}
+
+static int ecdsa_s390x_nistp_verify_sig(const unsigned char *dgst, int dgstlen,
+ const ECDSA_SIG *sig, EC_KEY *eckey,
+ unsigned int fc, int len)
+{
+ unsigned char param[S390X_SIZE_PARAM];
+ int rc = -1;
+ BN_CTX *ctx;
+ BIGNUM *x, *y;
+ const EC_GROUP *group;
+ const EC_POINT *pubkey;
+ int off;
+
+ group = EC_KEY_get0_group(eckey);
+ pubkey = EC_KEY_get0_public_key(eckey);
+ if (eckey == NULL || group == NULL || pubkey == NULL || sig == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_VERIFY_SIG, EC_R_MISSING_PARAMETERS);
+ return -1;
+ }
+
+ if (!EC_KEY_can_sign(eckey)) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_VERIFY_SIG,
+ EC_R_CURVE_DOES_NOT_SUPPORT_SIGNING);
+ return -1;
+ }
+
+ ctx = BN_CTX_new();
+ if (ctx == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+
+ BN_CTX_start(ctx);
+
+ x = BN_CTX_get(ctx);
+ y = BN_CTX_get(ctx);
+ if (x == NULL || y == NULL) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_VERIFY_SIG, ERR_R_MALLOC_FAILURE);
+ goto ret;
+ }
+
+ memset(param, 0, sizeof(param));
+ off = len - (dgstlen > len ? len : dgstlen);
+ memcpy(param + S390X_OFF_H(len) + off, dgst, len - off);
+
+ if (group->meth->point_get_affine_coordinates(group, pubkey,
+ x, y, ctx) != 1
+ || BN_bn2binpad(sig->r, param + S390X_OFF_R(len), len) == -1
+ || BN_bn2binpad(sig->s, param + S390X_OFF_S(len), len) == -1
+ || BN_bn2binpad(x, param + S390X_OFF_X(len), len) == -1
+ || BN_bn2binpad(y, param + S390X_OFF_Y(len), len) == -1) {
+ ECerr(EC_F_ECDSA_S390X_NISTP_VERIFY_SIG, ERR_R_BN_LIB);
+ goto ret;
+ }
+
+ rc = s390x_kdsa(fc, param, NULL, 0) == 0 ? 1 : 0;
+ret:
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ return rc;
+}
+
#define EC_GFP_S390X_NISTP_METHOD(bits) \
\
static int ec_GFp_s390x_nistp##bits##_mul(const EC_GROUP *group, \
@@ -122,6 +289,29 @@ static int ec_GFp_s390x_nistp##bits##_mu
S390X_SIZE_P##bits); \
} \
\
+static ECDSA_SIG *ecdsa_s390x_nistp##bits##_sign_sig(const unsigned \
+ char *dgst, \
+ int dgstlen, \
+ const BIGNUM *kinv,\
+ const BIGNUM *r, \
+ EC_KEY *eckey) \
+{ \
+ return ecdsa_s390x_nistp_sign_sig(dgst, dgstlen, kinv, r, eckey, \
+ S390X_ECDSA_SIGN_P##bits, \
+ S390X_SIZE_P##bits); \
+} \
+ \
+static int ecdsa_s390x_nistp##bits##_verify_sig(const \
+ unsigned char *dgst, \
+ int dgstlen, \
+ const ECDSA_SIG *sig, \
+ EC_KEY *eckey) \
+{ \
+ return ecdsa_s390x_nistp_verify_sig(dgst, dgstlen, sig, eckey, \
+ S390X_ECDSA_VERIFY_P##bits, \
+ S390X_SIZE_P##bits); \
+} \
+ \
const EC_METHOD *EC_GFp_s390x_nistp##bits##_method(void) \
{ \
static const EC_METHOD EC_GFp_s390x_nistp##bits##_meth = { \
@@ -176,8 +366,8 @@ const EC_METHOD *EC_GFp_s390x_nistp##bit
NULL, /* keyfinish */ \
ecdh_simple_compute_key, \
ecdsa_simple_sign_setup, \
- ecdsa_simple_sign_sig, \
- ecdsa_simple_verify_sig, \
+ ecdsa_s390x_nistp##bits##_sign_sig, \
+ ecdsa_s390x_nistp##bits##_verify_sig, \
NULL, /* field_inverse_mod_ord */ \
ec_GFp_simple_blind_coordinates, \
ec_GFp_simple_ladder_pre, \
@@ -186,8 +376,12 @@ const EC_METHOD *EC_GFp_s390x_nistp##bit
}; \
static const EC_METHOD *ret; \
\
- if (OPENSSL_s390xcap_P.pcc[1] \
- & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_P##bits)) \
+ if ((OPENSSL_s390xcap_P.pcc[1] \
+ & S390X_CAPBIT(S390X_SCALAR_MULTIPLY_P##bits)) \
+ && (OPENSSL_s390xcap_P.kdsa[0] \
+ & S390X_CAPBIT(S390X_ECDSA_VERIFY_P##bits)) \
+ && (OPENSSL_s390xcap_P.kdsa[0] \
+ & S390X_CAPBIT(S390X_ECDSA_SIGN_P##bits))) \
ret = &EC_GFp_s390x_nistp##bits##_meth; \
else \
ret = EC_GFp_mont_method(); \
Index: openssl-1.1.1e/crypto/err/openssl.txt
===================================================================
--- openssl-1.1.1e.orig/crypto/err/openssl.txt 2020-03-20 13:13:44.618571104 +0100
+++ openssl-1.1.1e/crypto/err/openssl.txt 2020-03-20 13:14:02.446664907 +0100
@@ -499,6 +499,8 @@ EC_F_ECDSA_VERIFY:253:ECDSA_verify
EC_F_ECDSA_SIMPLE_SIGN_SETUP:310:ecdsa_simple_sign_setup
EC_F_ECDSA_SIMPLE_SIGN_SIG:311:ecdsa_simple_sign_sig
EC_F_ECDSA_SIMPLE_VERIFY_SIG:312:ecdsa_simple_verify_sig
+EC_F_ECDSA_S390X_NISTP_SIGN_SIG:313:ecdsa_s390x_nistp_sign_sig
+EC_F_ECDSA_S390X_NISTP_VERIFY_SIG:314:ecdsa_s390x_nistp_verify_sig
EC_F_ECD_ITEM_VERIFY:270:ecd_item_verify
EC_F_ECKEY_PARAM2TYPE:223:eckey_param2type
EC_F_ECKEY_PARAM_DECODE:212:eckey_param_decode
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