diff options
| -rw-r--r-- | lib/libcrypto/crypto_internal.h | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/lib/libcrypto/crypto_internal.h b/lib/libcrypto/crypto_internal.h index 2c2e63cc0d2..c5de5b7b517 100644 --- a/lib/libcrypto/crypto_internal.h +++ b/lib/libcrypto/crypto_internal.h @@ -1,4 +1,4 @@ -/* $OpenBSD: crypto_internal.h,v 1.13 2024/10/17 14:27:57 jsing Exp $ */ +/* $OpenBSD: crypto_internal.h,v 1.14 2024/11/08 14:05:43 jsing Exp $ */ /* * Copyright (c) 2023 Joel Sing <jsing@openbsd.org> * @@ -29,6 +29,74 @@ extern char _ctassert[(x) ? 1 : -1] __attribute__((__unused__)) /* + * Constant time functions for size_t. + */ +#ifndef HAVE_CRYPTO_CT_NE_ZERO +static inline int +crypto_ct_ne_zero(size_t v) +{ + return (v | ~(v - 1)) >> ((sizeof(v) * 8) - 1); +} +#endif + +#ifndef HAVE_CRYPTO_CT_NE_ZERO_MASK +static inline size_t +crypto_ct_ne_zero_mask(size_t v) +{ + return 0 - crypto_ct_ne_zero(v); +} +#endif + +#ifndef HAVE_CRYPTO_CT_EQ_ZERO +static inline int +crypto_ct_eq_zero(size_t v) +{ + return 1 - crypto_ct_ne_zero(v); +} +#endif + +#ifndef HAVE_CRYPTO_CT_EQ_ZERO_MASK_U8 +static inline size_t +crypto_ct_eq_zero_mask(size_t v) +{ + return 0 - crypto_ct_eq_zero(v); +} +#endif + +#ifndef HAVE_CRYPTO_CT_LT +static inline int +crypto_ct_lt(size_t a, size_t b) +{ + return (((a - b) | (b & ~a)) & (b | ~a)) >> + (sizeof(size_t) * 8 - 1); +} +#endif + +#ifndef HAVE_CRYPTO_CT_LT_MASK +static inline size_t +crypto_ct_lt_mask(size_t a, size_t b) +{ + return 0 - crypto_ct_lt(a, b); +} +#endif + +#ifndef HAVE_CRYPTO_CT_GT +static inline int +crypto_ct_gt(size_t a, size_t b) +{ + return crypto_ct_lt(b, a); +} +#endif + +#ifndef HAVE_CRYPTO_CT_GT_MASK +static inline size_t +crypto_ct_gt_mask(size_t a, size_t b) +{ + return 0 - crypto_ct_gt(a, b); +} +#endif + +/* * Constant time operations for uint8_t. */ #ifndef HAVE_CRYPTO_CT_NE_ZERO_U8 |