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Move mbedtls_mpi_core_fill_random to the proper .c file

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2022-09-09 21:00:00 +02:00
parent 5980f2bd36
commit 009d195a56
2 changed files with 29 additions and 28 deletions
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28
library/bignum.c
View file

@ -1931,34 +1931,6 @@ cleanup:
return( ret ); return( ret );
} }
/* Fill X with n_bytes random bytes.
* X must already have room for those bytes.
* The ordering of the bytes returned from the RNG is suitable for
* deterministic ECDSA (see RFC 6979 §3.3 and mbedtls_mpi_core_random()).
* The size and sign of X are unchanged.
* n_bytes must not be 0.
*/
int mbedtls_mpi_core_fill_random(
mbedtls_mpi_uint *X, size_t X_limbs,
size_t n_bytes,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const size_t limbs = CHARS_TO_LIMBS( n_bytes );
const size_t overhead = ( limbs * ciL ) - n_bytes;
if( X_limbs < limbs )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
memset( X, 0, overhead );
memset( (unsigned char *) X + limbs * ciL, 0, ( X_limbs - limbs ) * ciL );
MBEDTLS_MPI_CHK( f_rng( p_rng, (unsigned char *) X + overhead, n_bytes ) );
mbedtls_mpi_core_bigendian_to_host( X, limbs );
cleanup:
return( ret );
}
/* /*
* Fill X with size bytes of random. * Fill X with size bytes of random.
* *

29
library/bignum_core.c
View file

@ -553,4 +553,33 @@ void mbedtls_mpi_core_ct_uint_table_lookup( mbedtls_mpi_uint *dest,
} }
} }
/* Fill X with n_bytes random bytes.
* X must already have room for those bytes.
* The ordering of the bytes returned from the RNG is suitable for
* deterministic ECDSA (see RFC 6979 §3.3 and mbedtls_mpi_core_random()).
* The size and sign of X are unchanged.
* n_bytes must not be 0.
*/
int mbedtls_mpi_core_fill_random(
mbedtls_mpi_uint *X, size_t X_limbs,
size_t n_bytes,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const size_t limbs = CHARS_TO_LIMBS( n_bytes );
const size_t overhead = ( limbs * ciL ) - n_bytes;
if( X_limbs < limbs )
return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
memset( X, 0, overhead );
memset( (unsigned char *) X + limbs * ciL, 0, ( X_limbs - limbs ) * ciL );
MBEDTLS_MPI_CHK( f_rng( p_rng, (unsigned char *) X + overhead, n_bytes ) );
mbedtls_mpi_core_bigendian_to_host( X, limbs );
cleanup:
return( ret );
}
#endif /* MBEDTLS_BIGNUM_C */ #endif /* MBEDTLS_BIGNUM_C */