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Fix size check in p25519 modular reduction

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The check was meant to precisely catch an underflow.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
This commit is contained in:
Hanno Becker 2022-04-12 10:55:34 +01:00
parent 0235f7512f
commit 2ef0cff6c3
1 changed files with 1 additions and 1 deletions
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library/ecp_curves.c
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@ -5223,7 +5223,7 @@ static int ecp_mod_p255( mbedtls_mpi *N )
/* Helper references for top part of N */ /* Helper references for top part of N */
mbedtls_mpi_uint * const NT_p = N->p + P255_WIDTH; mbedtls_mpi_uint * const NT_p = N->p + P255_WIDTH;
const size_t NT_n = N->n - P255_WIDTH; const size_t NT_n = N->n - P255_WIDTH;
if( NT_n == 0 || NT_n > P255_WIDTH ) if( NT_n == 0 || NT_n > N->n )
return( 0 ); return( 0 );
/* Split N as N + 2^256 M */ /* Split N as N + 2^256 M */