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home:dirkmueller:acdc:as_python3_module
openssl-1_1.27652
openssl-Add-some-new-constant-time-functions-ne...
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File openssl-Add-some-new-constant-time-functions-needed-by-curve.patch of Package openssl-1_1.27652
From e0fa632420adaab5f0c5fb1db7190dcbd7637a18 Mon Sep 17 00:00:00 2001 From: Matt Caswell <matt@openssl.org> Date: Thu, 1 Feb 2018 13:51:53 +0000 Subject: [PATCH] Add some new constant time functions needed by curve448 Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/5105) --- include/internal/constant_time_locl.h | 91 ++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) --- a/include/internal/constant_time_locl.h +++ b/include/internal/constant_time_locl.h @@ -11,6 +11,7 @@ # define HEADER_CONSTANT_TIME_LOCL_H # include <stdlib.h> +# include <string.h> # include <openssl/e_os2.h> /* For 'ossl_inline' */ #ifdef __cplusplus @@ -38,6 +39,8 @@ extern "C" { * replace this with something else on odd CPUs. */ static ossl_inline unsigned int constant_time_msb(unsigned int a); +/* Convenience method for uint32_t. */ +static ossl_inline uint32_t constant_time_msb_32(uint32_t a); /* Convenience method for uint64_t. */ static ossl_inline uint64_t constant_time_msb_64(uint64_t a); @@ -61,6 +64,8 @@ static ossl_inline unsigned char constan static ossl_inline unsigned int constant_time_is_zero(unsigned int a); /* Convenience method for getting an 8-bit mask. */ static ossl_inline unsigned char constant_time_is_zero_8(unsigned int a); +/* Convenience method for getting a 32-bit mask. */ +static ossl_inline uint32_t constant_time_is_zero_32(uint32_t a); /* Returns 0xff..f if a == b and 0 otherwise. */ static ossl_inline unsigned int constant_time_eq(unsigned int a, @@ -87,6 +92,9 @@ static ossl_inline unsigned int constant static ossl_inline unsigned char constant_time_select_8(unsigned char mask, unsigned char a, unsigned char b); +/* Convenience method for uint32_t. */ +static ossl_inline uint32_t constant_time_select_32(uint32_t mask, uint32_t a, + uint32_t b); /* Convenience method for uint64_t. */ static ossl_inline uint64_t constant_time_select_64(uint64_t mask, uint64_t a, uint64_t b); @@ -109,6 +117,11 @@ static ossl_inline size_t constant_time_ return 0 - (a >> (sizeof(a) * 8 - 1)); } +static ossl_inline uint32_t constant_time_msb_32(uint32_t a) +{ + return 0 - (a >> 31); +} + static ossl_inline unsigned int constant_time_lt(unsigned int a, unsigned int b) { @@ -168,6 +181,11 @@ static ossl_inline unsigned char constan return (unsigned char)(constant_time_is_zero(a)); } +static ossl_inline uint32_t constant_time_is_zero_32(uint32_t a) +{ + return constant_time_msb_32(~a & (a - 1)); +} + static ossl_inline unsigned int constant_time_eq(unsigned int a, unsigned int b) { @@ -227,6 +245,12 @@ static ossl_inline int constant_time_sel (unsigned)(b))); } +static ossl_inline uint32_t constant_time_select_32(uint32_t mask, uint32_t a, + uint32_t b) +{ + return (mask & a) | (~mask & b); +} + static ossl_inline int constant_time_select_int(unsigned int mask, int a, int b) { @@ -246,6 +270,73 @@ static ossl_inline uint64_t constant_tim */ void err_clear_last_constant_time(int clear); +/* + * mask must be 0xFFFFFFFF or 0x00000000. + * + * if (mask) { + * uint32_t tmp = *a; + * + * *a = *b; + * *b = tmp; + * } + */ +static ossl_inline void constant_time_cond_swap_32(uint32_t mask, uint32_t *a, + uint32_t *b) +{ + uint32_t xor = *a ^ *b; + + xor &= mask; + *a ^= xor; + *b ^= xor; +} + +/* + * mask must be 0xFFFFFFFF or 0x00000000. + * + * if (mask) { + * uint64_t tmp = *a; + * + * *a = *b; + * *b = tmp; + * } + */ +static ossl_inline void constant_time_cond_swap_64(uint64_t mask, uint64_t *a, + uint64_t *b) +{ + uint64_t xor = *a ^ *b; + + xor &= mask; + *a ^= xor; + *b ^= xor; +} + +/* + * table is a two dimensional array of bytes. Each row has rowsize elements. + * Copies row number idx into out. rowsize and numrows are not considered + * private. + */ +static ossl_inline void constant_time_lookup(void *out, + const void *table, + size_t rowsize, + size_t numrows, + size_t idx) +{ + size_t i, j; + const unsigned char *tablec = (const unsigned char *)table; + unsigned char *outc = (unsigned char *)out; + unsigned char mask; + + memset(out, 0, rowsize); + + /* Note idx may underflow - but that is well defined */ + for (i = 0; i < numrows; i++, idx--) { + mask = (unsigned char)constant_time_is_zero_s(idx); + for (j = 0; j < rowsize; j++) + *(outc + j) |= constant_time_select_8(mask, *(tablec++), 0); + } +} + + #ifdef __cplusplus } #endif
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