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Add mbedtls_ct_bool_if and mbedtls_ct_bool_if_else_0

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-09-19 21:51:13 +01:00
parent 437500c5b1
commit 143f5f7c68
3 changed files with 50 additions and 0 deletions
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14
library/constant_time_impl.h
View File

@ -350,6 +350,14 @@ static inline unsigned mbedtls_ct_uint_if(mbedtls_ct_condition_t condition,
return (unsigned) mbedtls_ct_if(condition, (mbedtls_ct_uint_t) if1, (mbedtls_ct_uint_t) if0);
}
static inline mbedtls_ct_condition_t mbedtls_ct_bool_if(mbedtls_ct_condition_t condition,
mbedtls_ct_condition_t if1,
mbedtls_ct_condition_t if0)
{
return (mbedtls_ct_condition_t) mbedtls_ct_if(condition, (mbedtls_ct_uint_t) if1,
(mbedtls_ct_uint_t) if0);
}
#if defined(MBEDTLS_BIGNUM_C)
static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if(mbedtls_ct_condition_t condition,
@ -373,6 +381,12 @@ static inline unsigned mbedtls_ct_uint_if_else_0(mbedtls_ct_condition_t conditio
return (unsigned) (condition & if1);
}
static inline mbedtls_ct_condition_t mbedtls_ct_bool_if_else_0(mbedtls_ct_condition_t condition,
mbedtls_ct_condition_t if1)
{
return (mbedtls_ct_condition_t) (condition & if1);
}
#if defined(MBEDTLS_BIGNUM_C)
static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if_else_0(mbedtls_ct_condition_t condition,

33
library/constant_time_internal.h
View File

@ -291,6 +291,22 @@ static inline unsigned mbedtls_ct_uint_if(mbedtls_ct_condition_t condition,
unsigned if1,
unsigned if0);
/** Choose between two mbedtls_ct_condition_t values.
*
* Functionally equivalent to:
*
* condition ? if1 : if0.
*
* \param condition Condition to test.
* \param if1 Value to use if \p condition == MBEDTLS_CT_TRUE.
* \param if0 Value to use if \p condition == MBEDTLS_CT_FALSE.
*
* \return \c if1 if \p condition == MBEDTLS_CT_TRUE, otherwise \c if0.
*/
static inline mbedtls_ct_condition_t mbedtls_ct_bool_if(mbedtls_ct_condition_t condition,
mbedtls_ct_condition_t if1,
mbedtls_ct_condition_t if0);
#if defined(MBEDTLS_BIGNUM_C)
/** Choose between two mbedtls_mpi_uint values.
@ -327,6 +343,23 @@ static inline mbedtls_mpi_uint mbedtls_ct_mpi_uint_if(mbedtls_ct_condition_t con
*/
static inline unsigned mbedtls_ct_uint_if_else_0(mbedtls_ct_condition_t condition, unsigned if1);
/** Choose between an mbedtls_ct_condition_t and 0.
*
* Functionally equivalent to:
*
* condition ? if1 : 0.
*
* Functionally equivalent to mbedtls_ct_bool_if(condition, if1, 0) but
* results in smaller code size.
*
* \param condition Condition to test.
* \param if1 Value to use if \p condition == MBEDTLS_CT_TRUE.
*
* \return \c if1 if \p condition == MBEDTLS_CT_TRUE, otherwise 0.
*/
static inline mbedtls_ct_condition_t mbedtls_ct_bool_if_else_0(mbedtls_ct_condition_t condition,
mbedtls_ct_condition_t if1);
/** Choose between a size_t value and 0.
*
* Functionally equivalent to:

3
tests/suites/test_suite_constant_time.function
View File

@ -131,12 +131,15 @@ void mbedtls_ct_if(char *c_str, char *t_str, char *f_str)
TEST_EQUAL(mbedtls_ct_if(c, t, f), expected);
TEST_EQUAL(mbedtls_ct_size_if(c, t, f), (size_t) expected);
TEST_EQUAL(mbedtls_ct_uint_if(c, t, f), (unsigned) expected);
TEST_EQUAL(mbedtls_ct_bool_if(c, mbedtls_ct_bool(t), mbedtls_ct_bool(f)),
mbedtls_ct_bool(expected));
#if defined(MBEDTLS_BIGNUM_C)
TEST_EQUAL(mbedtls_ct_mpi_uint_if(c, t, f), (mbedtls_mpi_uint) expected);
#endif
TEST_EQUAL(mbedtls_ct_uint_if_else_0(c, t), (unsigned) expected0);
TEST_EQUAL(mbedtls_ct_size_if_else_0(c, (size_t) t), (size_t) expected0);
TEST_EQUAL(mbedtls_ct_bool_if_else_0(c, mbedtls_ct_bool(t)), mbedtls_ct_bool(expected0));
#if defined(MBEDTLS_BIGNUM_C)
TEST_EQUAL(mbedtls_ct_mpi_uint_if_else_0(c, t), (mbedtls_mpi_uint) expected0);
#endif