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Co-authored-by: Tom Cosgrove <81633263+tom-cosgrove-arm@users.noreply.github.com>
Co-authored-by: Werner Lewis <werner.wmlewis@gmail.com>

Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2022-08-19 12:05:28 +01:00
parent b7a88eca42
commit ca5688e10c
3 changed files with 9 additions and 6 deletions
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2
library/bignum.c
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@ -712,7 +712,7 @@ cleanup:
int mbedtls_mpi_write_binary_le( const mbedtls_mpi *X, int mbedtls_mpi_write_binary_le( const mbedtls_mpi *X,
unsigned char *buf, size_t buflen ) unsigned char *buf, size_t buflen )
{ {
return( mbedtls_mpi_core_write_le( X->p, X->n, buf, buflen) ); return( mbedtls_mpi_core_write_le( X->p, X->n, buf, buflen ) );
} }
/* /*

5
library/bignum_core.c
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@ -174,7 +174,10 @@ int mbedtls_mpi_core_read_le( mbedtls_mpi_uint *X,
memset( X, 0, X_limbs * ciL ); memset( X, 0, X_limbs * ciL );
for( size_t i = 0; i < input_length; i++ ) for( size_t i = 0; i < input_length; i++ )
X[i / ciL] |= ((mbedtls_mpi_uint) input[i]) << ((i % ciL) << 3); {
size_t offset = ( ( i % ciL ) << 3 );
X[i / ciL] |= ( (mbedtls_mpi_uint) input[i] ) << offset;
}
} }
return( 0 ); return( 0 );

8
library/bignum_core.h
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@ -141,9 +141,9 @@ int mbedtls_mpi_core_write_be( const mbedtls_mpi_uint *A,
unsigned char *output, unsigned char *output,
size_t output_length ); size_t output_length );
#define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */ #define ciL ( sizeof(mbedtls_mpi_uint) ) /* chars in limb */
#define biL (ciL << 3) /* bits in limb */ #define biL ( ciL << 3 ) /* bits in limb */
#define biH (ciL << 2) /* half limb size */ #define biH ( ciL << 2 ) /* half limb size */
/* /*
* Convert between bits/chars and number of limbs * Convert between bits/chars and number of limbs
@ -153,6 +153,6 @@ int mbedtls_mpi_core_write_be( const mbedtls_mpi_uint *A,
#define CHARS_TO_LIMBS(i) ( (i) / ciL + ( (i) % ciL != 0 ) ) #define CHARS_TO_LIMBS(i) ( (i) / ciL + ( (i) % ciL != 0 ) )
/* Get a specific byte, without range checks. */ /* Get a specific byte, without range checks. */
#define GET_BYTE( X, i ) \ #define GET_BYTE( X, i ) \
( ( ( X )[( i ) / ciL] >> ( ( ( i ) % ciL ) * 8 ) ) & 0xff ) ( ( (X)[(i) / ciL] >> ( ( (i) % ciL ) * 8 ) ) & 0xff )
#endif /* MBEDTLS_BIGNUM_CORE_H */ #endif /* MBEDTLS_BIGNUM_CORE_H */