From 6a02cf6846fbac3d44e5f6054cbba29dc26fb5eb Mon Sep 17 00:00:00 2001 From: Joel Sing Date: Tue, 16 Apr 2024 13:07:15 +0000 Subject: Provide bn_expand_bytes(). This will be used in an upcoming change. ok tb@ --- lib/libcrypto/bn/bn_lib.c | 15 ++++++++++++++- lib/libcrypto/bn/bn_local.h | 3 ++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/lib/libcrypto/bn/bn_lib.c b/lib/libcrypto/bn/bn_lib.c index 6988a70f3b5..72b988650cc 100644 --- a/lib/libcrypto/bn/bn_lib.c +++ b/lib/libcrypto/bn/bn_lib.c @@ -1,4 +1,4 @@ -/* $OpenBSD: bn_lib.c,v 1.92 2024/04/16 13:04:05 jsing Exp $ */ +/* $OpenBSD: bn_lib.c,v 1.93 2024/04/16 13:07:14 jsing Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * @@ -231,6 +231,19 @@ bn_expand_bits(BIGNUM *bn, size_t bits) return bn_wexpand(bn, words); } +int +bn_expand_bytes(BIGNUM *bn, size_t bytes) +{ + int words; + + if (bytes > (INT_MAX - BN_BYTES + 1)) + return 0; + + words = (bytes + BN_BYTES - 1) / BN_BYTES; + + return bn_wexpand(bn, words); +} + int bn_wexpand(BIGNUM *bn, int words) { diff --git a/lib/libcrypto/bn/bn_local.h b/lib/libcrypto/bn/bn_local.h index cffc5a2ea1a..58b5d549034 100644 --- a/lib/libcrypto/bn/bn_local.h +++ b/lib/libcrypto/bn/bn_local.h @@ -1,4 +1,4 @@ -/* $OpenBSD: bn_local.h,v 1.42 2024/04/16 13:04:05 jsing Exp $ */ +/* $OpenBSD: bn_local.h,v 1.43 2024/04/16 13:07:14 jsing Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * @@ -260,6 +260,7 @@ int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, void bn_correct_top(BIGNUM *a); int bn_expand_bits(BIGNUM *a, size_t bits); +int bn_expand_bytes(BIGNUM *a, size_t bytes); int bn_wexpand(BIGNUM *a, int words); BN_ULONG bn_add_words(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp, -- cgit v1.2.3