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Simplify calculations for clear mask

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Signed-off-by: Przemyslaw Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemyslaw Stekiel 2021-12-02 12:14:56 +01:00
parent f6c2c87492
commit dc215f4b97
1 changed files with 2 additions and 4 deletions
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6
library/psa_crypto.c
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@ -4914,10 +4914,8 @@ static psa_status_t psa_generate_derived_ecc_key_weierstrass_helper(
* (8 * ceiling(m/8) - m) bits of the first byte in
* the string to zero.
*/
uint8_t clear_bit_count = (uint8_t) ( 8 * m_bytes - m );
uint8_t clear_bit_mask = ( ( 1 << clear_bit_count ) - 1 );
clear_bit_mask = ~( clear_bit_mask << ( 8 - clear_bit_count ) );
*data[0] = ( *data[0] & clear_bit_mask );
uint8_t clear_bit_mask = (1 << (m % 8)) - 1;
*data[0] &= clear_bit_mask;
}
/* 3. Convert the string to integer k by decoding it as a