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Document mpi_mul_hlp

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-07-23 21:27:15 +02:00
parent 1acf7cb76c
commit a5d8d89cca
1 changed files with 19 additions and 3 deletions
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22
library/bignum.c
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@ -1525,8 +1525,21 @@ int mbedtls_mpi_sub_int( mbedtls_mpi *X, const mbedtls_mpi *A, mbedtls_mpi_sint
return( mbedtls_mpi_sub_mpi( X, A, &_B ) );
}
/*
* Helper for mbedtls_mpi multiplication
/** Helper for mbedtls_mpi multiplication.
*
* Add \p b * \p s to \p d.
*
* \param i The number of limbs of \p s.
* \param[in] s A bignum to multiply, of size \p i.
* It may overlap with \p d, but only if
* \p d <= \p s.
* Its leading limb must not be \c 0.
* \param[in,out] d The bignum to add to.
* It must be sufficiently large to store the
* result of the multiplication. This means
* \p i + 1 limbs if \p d[\p i - 1] started as 0 and \p b
* is not known a priori.
* \param b A scalar to multiply.
*/
static
#if defined(__APPLE__) && defined(__arm__)
@ -1536,7 +1549,10 @@ static
*/
__attribute__ ((noinline))
#endif
void mpi_mul_hlp( size_t i, mbedtls_mpi_uint *s, mbedtls_mpi_uint *d, mbedtls_mpi_uint b )
void mpi_mul_hlp( size_t i,
const mbedtls_mpi_uint *s,
mbedtls_mpi_uint *d,
mbedtls_mpi_uint b )
{
mbedtls_mpi_uint c = 0, t = 0;