Make BN_BLINDING internal

RSA is pretty bad. In my most optimistic moments I dream of a world that
stopped using it. That won't happen during my lifetime, unfortunately.
Blinding is one way of making it a little less leaky. Unfortunately this
side-channel leak mitigation leaked out of the library for no good reason.
Let's at least fix that aspect of it.

ok jsing

11 files changed, 33 insertions, 79 deletions

diff --git a/lib/libcrypto/Symbols.list b/lib/libcrypto/Symbols.list
index 80be9faeae6..cac15579b51 100644
--- a/lib/libcrypto/Symbols.list
+++ b/lib/libcrypto/Symbols.list
@@ -374,17 +374,6 @@ BIO_vfree
 BIO_vprintf
 BIO_vsnprintf
 BIO_write
-BN_BLINDING_convert
-BN_BLINDING_convert_ex
-BN_BLINDING_create_param
-BN_BLINDING_free
-BN_BLINDING_get_flags
-BN_BLINDING_invert
-BN_BLINDING_invert_ex
-BN_BLINDING_new
-BN_BLINDING_set_flags
-BN_BLINDING_thread_id
-BN_BLINDING_update
 BN_CTX_end
 BN_CTX_free
 BN_CTX_get
@@ -2377,7 +2366,6 @@ RSA_set_default_method
 RSA_set_ex_data
 RSA_set_flags
 RSA_set_method
-RSA_setup_blinding
 RSA_sign
 RSA_sign_ASN1_OCTET_STRING
 RSA_size
diff --git a/lib/libcrypto/Symbols.namespace b/lib/libcrypto/Symbols.namespace
index 7a309ab4161..a58eb0b9a1f 100644
--- a/lib/libcrypto/Symbols.namespace
+++ b/lib/libcrypto/Symbols.namespace
@@ -2293,17 +2293,6 @@ _libre_BN_MONT_CTX_free
 _libre_BN_MONT_CTX_set
 _libre_BN_MONT_CTX_copy
 _libre_BN_MONT_CTX_set_locked
-_libre_BN_BLINDING_new
-_libre_BN_BLINDING_free
-_libre_BN_BLINDING_update
-_libre_BN_BLINDING_convert
-_libre_BN_BLINDING_invert
-_libre_BN_BLINDING_convert_ex
-_libre_BN_BLINDING_invert_ex
-_libre_BN_BLINDING_thread_id
-_libre_BN_BLINDING_get_flags
-_libre_BN_BLINDING_set_flags
-_libre_BN_BLINDING_create_param
 _libre_get_rfc2409_prime_768
 _libre_get_rfc2409_prime_1024
 _libre_BN_get_rfc2409_prime_768
@@ -2385,7 +2374,6 @@ _libre_RSA_sign_ASN1_OCTET_STRING
 _libre_RSA_verify_ASN1_OCTET_STRING
 _libre_RSA_blinding_on
 _libre_RSA_blinding_off
-_libre_RSA_setup_blinding
 _libre_RSA_padding_add_PKCS1_type_1
 _libre_RSA_padding_check_PKCS1_type_1
 _libre_RSA_padding_add_PKCS1_type_2
diff --git a/lib/libcrypto/bn/bn.h b/lib/libcrypto/bn/bn.h
index 7dc138d1700..689196c911f 100644
--- a/lib/libcrypto/bn/bn.h
+++ b/lib/libcrypto/bn/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.72 2023/06/13 09:12:22 tb Exp $ */
+/* $OpenBSD: bn.h,v 1.73 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -449,27 +449,6 @@ BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from);
 BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock,
     const BIGNUM *mod, BN_CTX *ctx);
 
-/* BN_BLINDING flags */
-#define	BN_BLINDING_NO_UPDATE	0x00000001
-#define	BN_BLINDING_NO_RECREATE	0x00000002
-
-BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod);
-void BN_BLINDING_free(BN_BLINDING *b);
-int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx);
-int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
-int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
-int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *);
-int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *);
-
-CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *);
-unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
-void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
-BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
-    const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
-    int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
-    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
-    BN_MONT_CTX *m_ctx);
-
 /* Primes from RFC 2409 */
 BIGNUM *get_rfc2409_prime_768(BIGNUM *bn);
 BIGNUM *get_rfc2409_prime_1024(BIGNUM *bn);
diff --git a/lib/libcrypto/bn/bn_blind.c b/lib/libcrypto/bn/bn_blind.c
index 07cd359e7e6..7332df2b567 100644
--- a/lib/libcrypto/bn/bn_blind.c
+++ b/lib/libcrypto/bn/bn_blind.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_blind.c,v 1.23 2023/07/08 12:21:58 beck Exp $ */
+/* $OpenBSD: bn_blind.c,v 1.24 2023/07/28 10:05:16 tb Exp $ */
 /* ====================================================================
  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  *
@@ -169,7 +169,6 @@ err:
 		BN_BLINDING_free(ret);
 	return (NULL);
 }
-LCRYPTO_ALIAS(BN_BLINDING_new);
 
 void
 BN_BLINDING_free(BN_BLINDING *r)
@@ -183,7 +182,6 @@ BN_BLINDING_free(BN_BLINDING *r)
 	BN_free(r->mod);
 	free(r);
 }
-LCRYPTO_ALIAS(BN_BLINDING_free);
 
 int
 BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
@@ -217,14 +215,12 @@ err:
 		b->counter = 0;
 	return (ret);
 }
-LCRYPTO_ALIAS(BN_BLINDING_update);
 
 int
 BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
 {
 	return BN_BLINDING_convert_ex(n, NULL, b, ctx);
 }
-LCRYPTO_ALIAS(BN_BLINDING_convert);
 
 int
 BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
@@ -253,14 +249,12 @@ BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
 
 	return ret;
 }
-LCRYPTO_ALIAS(BN_BLINDING_convert_ex);
 
 int
 BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
 {
 	return BN_BLINDING_invert_ex(n, NULL, b, ctx);
 }
-LCRYPTO_ALIAS(BN_BLINDING_invert);
 
 int
 BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
@@ -280,28 +274,24 @@ BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
 
 	return (ret);
 }
-LCRYPTO_ALIAS(BN_BLINDING_invert_ex);
 
 CRYPTO_THREADID *
 BN_BLINDING_thread_id(BN_BLINDING *b)
 {
 	return &b->tid;
 }
-LCRYPTO_ALIAS(BN_BLINDING_thread_id);
 
 unsigned long
 BN_BLINDING_get_flags(const BN_BLINDING *b)
 {
 	return b->flags;
 }
-LCRYPTO_ALIAS(BN_BLINDING_get_flags);
 
 void
 BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags)
 {
 	b->flags = flags;
 }
-LCRYPTO_ALIAS(BN_BLINDING_set_flags);
 
 BN_BLINDING *
 BN_BLINDING_create_param(BN_BLINDING *b, const BIGNUM *e, BIGNUM *m,
@@ -373,4 +363,3 @@ err:
 
 	return ret;
 }
-LCRYPTO_ALIAS(BN_BLINDING_create_param);
diff --git a/lib/libcrypto/bn/bn_local.h b/lib/libcrypto/bn/bn_local.h
index a8d40fbcc8b..989770f2d63 100644
--- a/lib/libcrypto/bn/bn_local.h
+++ b/lib/libcrypto/bn/bn_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_local.h,v 1.26 2023/07/09 18:27:22 tb Exp $ */
+/* $OpenBSD: bn_local.h,v 1.27 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -291,6 +291,27 @@ int	BN_mod_exp_recp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 int	BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
     BN_RECP_CTX *recp, BN_CTX *ctx);
 
+/* BN_BLINDING flags */
+#define	BN_BLINDING_NO_UPDATE	0x00000001
+#define	BN_BLINDING_NO_RECREATE	0x00000002
+
+BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod);
+void BN_BLINDING_free(BN_BLINDING *b);
+int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx);
+int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
+int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
+int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *);
+int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *);
+
+CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *);
+unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
+void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
+BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
+    const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
+    int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+    const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
+    BN_MONT_CTX *m_ctx);
+
 /* Explicitly const time / non-const time versions for internal use */
 int BN_mod_exp_ct(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
     const BIGNUM *m, BN_CTX *ctx);
diff --git a/lib/libcrypto/hidden/openssl/bn.h b/lib/libcrypto/hidden/openssl/bn.h
index 6c23a5c6d83..d58bd10672a 100644
--- a/lib/libcrypto/hidden/openssl/bn.h
+++ b/lib/libcrypto/hidden/openssl/bn.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn.h,v 1.1 2023/07/08 12:21:58 beck Exp $ */
+/* $OpenBSD: bn.h,v 1.2 2023/07/28 10:05:16 tb Exp $ */
 /*
  * Copyright (c) 2023 Bob Beck <beck@openbsd.org>
  *
@@ -131,17 +131,6 @@ LCRYPTO_USED(BN_MONT_CTX_free);
 LCRYPTO_USED(BN_MONT_CTX_set);
 LCRYPTO_USED(BN_MONT_CTX_copy);
 LCRYPTO_USED(BN_MONT_CTX_set_locked);
-LCRYPTO_USED(BN_BLINDING_new);
-LCRYPTO_USED(BN_BLINDING_free);
-LCRYPTO_USED(BN_BLINDING_update);
-LCRYPTO_USED(BN_BLINDING_convert);
-LCRYPTO_USED(BN_BLINDING_invert);
-LCRYPTO_USED(BN_BLINDING_convert_ex);
-LCRYPTO_USED(BN_BLINDING_invert_ex);
-LCRYPTO_USED(BN_BLINDING_thread_id);
-LCRYPTO_USED(BN_BLINDING_get_flags);
-LCRYPTO_USED(BN_BLINDING_set_flags);
-LCRYPTO_USED(BN_BLINDING_create_param);
 LCRYPTO_USED(get_rfc2409_prime_768);
 LCRYPTO_USED(get_rfc2409_prime_1024);
 LCRYPTO_USED(BN_get_rfc2409_prime_768);
diff --git a/lib/libcrypto/hidden/openssl/rsa.h b/lib/libcrypto/hidden/openssl/rsa.h
index f4342e21da0..ff47101a070 100644
--- a/lib/libcrypto/hidden/openssl/rsa.h
+++ b/lib/libcrypto/hidden/openssl/rsa.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa.h,v 1.1 2023/07/08 12:26:45 beck Exp $ */
+/* $OpenBSD: rsa.h,v 1.2 2023/07/28 10:05:16 tb Exp $ */
 /*
  * Copyright (c) 2023 Bob Beck <beck@openbsd.org>
  *
@@ -66,7 +66,6 @@ LCRYPTO_USED(RSA_sign_ASN1_OCTET_STRING);
 LCRYPTO_USED(RSA_verify_ASN1_OCTET_STRING);
 LCRYPTO_USED(RSA_blinding_on);
 LCRYPTO_USED(RSA_blinding_off);
-LCRYPTO_USED(RSA_setup_blinding);
 LCRYPTO_USED(RSA_padding_add_PKCS1_type_1);
 LCRYPTO_USED(RSA_padding_check_PKCS1_type_1);
 LCRYPTO_USED(RSA_padding_add_PKCS1_type_2);
diff --git a/lib/libcrypto/rsa/rsa.h b/lib/libcrypto/rsa/rsa.h
index ff88240f049..4fcef3a97c3 100644
--- a/lib/libcrypto/rsa/rsa.h
+++ b/lib/libcrypto/rsa/rsa.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa.h,v 1.64 2023/05/05 12:30:40 tb Exp $ */
+/* $OpenBSD: rsa.h,v 1.65 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -321,7 +321,6 @@ int RSA_verify_ASN1_OCTET_STRING(int type, const unsigned char *m,
 
 int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
 void RSA_blinding_off(RSA *rsa);
-BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *ctx);
 
 int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
     const unsigned char *f, int fl);
diff --git a/lib/libcrypto/rsa/rsa_crpt.c b/lib/libcrypto/rsa/rsa_crpt.c
index ea79280b15d..15108e24f06 100644
--- a/lib/libcrypto/rsa/rsa_crpt.c
+++ b/lib/libcrypto/rsa/rsa_crpt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_crpt.c,v 1.22 2023/07/08 12:26:45 beck Exp $ */
+/* $OpenBSD: rsa_crpt.c,v 1.23 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -229,4 +229,3 @@ err:
 
 	return ret;
 }
-LCRYPTO_ALIAS(RSA_setup_blinding);
diff --git a/lib/libcrypto/rsa/rsa_lib.c b/lib/libcrypto/rsa/rsa_lib.c
index 8831253b9fe..fbd2c2274c3 100644
--- a/lib/libcrypto/rsa/rsa_lib.c
+++ b/lib/libcrypto/rsa/rsa_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_lib.c,v 1.47 2023/07/08 12:26:45 beck Exp $ */
+/* $OpenBSD: rsa_lib.c,v 1.48 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -67,6 +67,7 @@
 #include <openssl/lhash.h>
 #include <openssl/rsa.h>
 
+#include "bn_local.h"
 #include "evp_local.h"
 #include "rsa_local.h"
 
diff --git a/lib/libcrypto/rsa/rsa_local.h b/lib/libcrypto/rsa/rsa_local.h
index b4e90abd947..e4c3040b6f1 100644
--- a/lib/libcrypto/rsa/rsa_local.h
+++ b/lib/libcrypto/rsa/rsa_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_local.h,v 1.3 2023/07/21 15:26:51 tb Exp $ */
+/* $OpenBSD: rsa_local.h,v 1.4 2023/07/28 10:05:16 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -153,4 +153,6 @@ int RSA_padding_check_X931(unsigned char *to, int tlen,
     const unsigned char *f, int fl, int rsa_len);
 int RSA_X931_hash_id(int nid);
 
+BN_BLINDING *RSA_setup_blinding(RSA *rsa, BN_CTX *ctx);
+
 __END_HIDDEN_DECLS