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bignum_core: Aligned xxx_core_shift_l to xxx_core_shift_r

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This patch modifies the left-shift implementation to closely
align in interface and behaviour to the existing right-shift
method.

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis
2023-04-20 14:22:16 +01:00
parent ad808dd5f1
commit ec09e25251
2 changed files with 32 additions and 37 deletions
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19
library/bignum_core.h
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@@ -278,7 +278,7 @@ int mbedtls_mpi_core_write_be(const mbedtls_mpi_uint *A,
unsigned char *output,
size_t output_length);
/** \brief Shift an MPI right in place by a number of bits.
/** \brief Shift an MPI in-place right by a number of bits.
*
* Shifting by more bits than there are bit positions
* in \p X is valid and results in setting \p X to 0.
@@ -294,16 +294,19 @@ void mbedtls_mpi_core_shift_r(mbedtls_mpi_uint *X, size_t limbs,
size_t count);
/**
* \brief Perform a left-shift on an MPI: X <<= count
* \brief Shift an MPI in-place left by a number of bits.
*
* \param X The MPI to shift. This must point to an initialized MPI.
* \param count The number of bits to shift by.
* Shifting by more bits than there are bit positions
* in \p X is valid and results in setting \p X to 0.
*
* \return \c 0 if successful.
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED if a memory allocation failed.
* \return Another negative error code on different kinds of failure.
* This function's execution time depends on the value
* of \p count (and of course \p limbs).
* \param[in,out] X The number to shift.
* \param limbs The number of limbs of \p X. This must be at least 1.
* \param count The number of bits to shift by.
*/
int mbedtls_mpi_shift_l( mbedtls_mpi *X, size_t count );
void mbedtls_mpi_core_shift_l(mbedtls_mpi_uint *X, size_t limbs,
size_t count);
/**
* \brief Add two fixed-size large unsigned integers, returning the carry.