From 7122f09ce78127173c6a0136a7bf9389ea91072f Mon Sep 17 00:00:00 2001
From: igrkir <i.kirillov@kryptonite.ru>
Date: Fri, 4 Jun 2021 13:23:51 +0300
Subject: [PATCH] fix OpenSSL v.1.1.1 API consistency

revert commit 4108e77e0eb091fdd9b9c4174374a6ac0cc0abd0:
remove "const" in pub_decode_gost_ec().
First commited on master branch on May 26, 2020 (see https://github.com/openssl/openssl/commit/7674e92324648b59786d86d8e9014bbaed4e6d07).

partially revert commit dbc8f4780fa78d66a68174f78f9ae9aa9cdad53c:
OpenSSL v.1.1.1 API has no function EC_GROUP_get0_field().
First commited on master branch on Feb 15, 2019 (see https://github.com/openssl/openssl/commit/fa1f03061037cbdac5369849a885c1191a2550d9).

checks OpenSSL v.3.0 API function calls:
OSSL_STORE_attach(), PEM_write_bio_X509_PUBKEY()/i2d_X509_PUBKEY_bio().
First commited on master branch on May 13, 2020 (see https://github.com/openssl/openssl/commit/6ab6ecfd6d2d659326f427dceb1b65ae1b4b012b).
First commited on master branch on Nov 29, 2019 (see https://github.com/openssl/openssl/commit/cb58d81e68c72ab0128e0a5fc6faa007f8632acd).
---
 gost_ameth.c   | 4 ++--
 gost_ec_keyx.c | 6 ++++--
 test_params.c  | 5 +++++
 test_sign.c    | 5 +++++
 4 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/gost_ameth.c b/gost_ameth.c
index f4f50fa..c60ce0a 100644
--- a/gost_ameth.c
+++ b/gost_ameth.c
@@ -229,7 +229,7 @@ BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
  * GOST CMS processing functions
  */
 /* FIXME reaarange declarations */
-static int pub_decode_gost_ec(EVP_PKEY *pk, const X509_PUBKEY *pub);
+static int pub_decode_gost_ec(EVP_PKEY *pk, X509_PUBKEY *pub);
 
 static int gost_cms_set_kari_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
 {
@@ -902,7 +902,7 @@ static int param_cmp_gost_ec(const EVP_PKEY *a, const EVP_PKEY *b)
 }
 
 /* ---------- Public key functions * --------------------------------------*/
-static int pub_decode_gost_ec(EVP_PKEY *pk, const X509_PUBKEY *pub)
+static int pub_decode_gost_ec(EVP_PKEY *pk, X509_PUBKEY *pub)
 {
     X509_ALGOR *palg = NULL;
     const unsigned char *pubkey_buf = NULL;
diff --git a/gost_ec_keyx.c b/gost_ec_keyx.c
index eeb0122..860315d 100644
--- a/gost_ec_keyx.c
+++ b/gost_ec_keyx.c
@@ -30,7 +30,7 @@ int VKO_compute_key(unsigned char *shared_key,
                     const int vko_dgst_nid)
 {
     unsigned char *databuf = NULL;
-    BIGNUM *scalar = NULL, *X = NULL, *Y = NULL;
+    BIGNUM *scalar = NULL, *X = NULL, *Y = NULL, *order = NULL;
     const EC_GROUP *grp = NULL;
     EC_POINT *pnt = NULL;
     BN_CTX *ctx = NULL;
@@ -51,9 +51,11 @@ int VKO_compute_key(unsigned char *shared_key,
         goto err;
     }
 
+    order = BN_CTX_get(ctx);
     grp = EC_KEY_get0_group(priv_key);
     scalar = BN_CTX_get(ctx);
     X = BN_CTX_get(ctx);
+    EC_GROUP_get_order(grp, order, ctx);
 
     if ((Y = BN_CTX_get(ctx)) == NULL
         || (pnt = EC_POINT_new(grp)) == NULL
@@ -80,7 +82,7 @@ int VKO_compute_key(unsigned char *shared_key,
         goto err;
     }
 
-    half_len = BN_num_bytes(EC_GROUP_get0_field(grp));
+    half_len = BN_num_bytes(order);
     buf_len = 2 * half_len;
     if ((databuf = OPENSSL_malloc(buf_len)) == NULL) {
         GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
diff --git a/test_params.c b/test_params.c
index 8ce946d..1c8118f 100644
--- a/test_params.c
+++ b/test_params.c
@@ -958,6 +958,7 @@ static int test_cert(struct test_cert *tc)
     ret |= err;
     X509_free(y);
 
+#if OPENSSL_VERSION_MAJOR >= 3
     /* Convert public key to PEM and back. */
     T(BIO_reset(bp));
     T(PEM_write_bio_X509_PUBKEY(bp, xk));
@@ -980,6 +981,10 @@ static int test_cert(struct test_cert *tc)
     print_test_result(!err);
     ret |= err;
     BIO_free(bp);
+#else 
+    T(BIO_reset(bp));
+    BIO_free(bp);
+#endif
 
     /*
      * Verify
diff --git a/test_sign.c b/test_sign.c
index c76855c..57cf666 100644
--- a/test_sign.c
+++ b/test_sign.c
@@ -170,6 +170,7 @@ static int test_sign(struct test_sign *t)
     EVP_PKEY_free(pkey);
 #endif
 
+#if OPENSSL_VERSION_MAJOR >= 3
     /* Convert to DER and back, using OSSL_STORE API. */
     T(BIO_reset(bp));
     T(i2d_PrivateKey_bio(bp, priv_key));
@@ -199,6 +200,10 @@ static int test_sign(struct test_sign *t)
     } else
 	printf(cCYAN "skipped\n" cNORM);
     BIO_free(bp);
+#else
+    T(BIO_reset(bp));
+    BIO_free(bp);
+#endif
 
     /* Convert to DER and back, using memory API. */
     unsigned char *kptr = NULL;
-- 
2.39.2