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Rework mbedtls_ecp_write_key to remove unnecessary output parameter

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Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2020-06-11 17:00:36 +02:00
parent e3fd39289e
commit c9b7f78647
5 changed files with 14 additions and 32 deletions
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10
include/mbedtls/ecp.h
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@ -1152,20 +1152,20 @@ int mbedtls_ecp_read_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
*
* \param grp_id The ECP group identifier.
* \param key The private key.
* \param olen The amount of bytes written into the output buffer.
* \param buf The output buffer containing the binary representation of
* the key. (Big endian integer for Weierstrass curves, byte
* \param buf The output buffer for containing the binary representation
* of the key. (Big endian integer for Weierstrass curves, byte
* string for Montgomery curves.)
* \param buflen The total length of the buffer in bytes.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if key is larger than buffer.
* \return #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the \p key
representation is larger than the available space in \p buf.
* \return #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the operation for
* the group is not implemented.
* \return Another negative error code on different kinds of failure.
*/
int mbedtls_ecp_write_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
size_t *olen, unsigned char *buf, size_t buflen );
unsigned char *buf, size_t buflen );
/**
* \brief This function checks that the keypair objects

5
library/ecp.c
View File

@ -3000,13 +3000,12 @@ cleanup:
* Write a private key.
*/
int mbedtls_ecp_write_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
size_t *olen, unsigned char *buf, size_t buflen )
unsigned char *buf, size_t buflen )
{
int ret = 0;
ECP_VALIDATE_RET( key != NULL );
ECP_VALIDATE_RET( buf != NULL );
ECP_VALIDATE_RET( olen != NULL );
if( ( ret = mbedtls_ecp_group_load( &key->grp, grp_id ) ) != 0 )
return( ret );
@ -3022,7 +3021,6 @@ int mbedtls_ecp_write_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key
return MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary_le( &key->d, buf, buflen ) );
*olen = ECP_CURVE25519_KEY_SIZE;
}
else
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
@ -3033,7 +3031,6 @@ int mbedtls_ecp_write_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key
if( mbedtls_ecp_get_type( &key->grp ) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS )
{
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &key->d, buf, buflen ) );
*olen = mbedtls_mpi_size( &key->d );
}
#endif

3
library/pkwrite.c
View File

@ -166,10 +166,9 @@ static int pk_write_ec_private( unsigned char **p, unsigned char *start,
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t byte_length = ( ec->grp.pbits + 7 ) / 8;
size_t output_length;
unsigned char tmp[MBEDTLS_ECP_MAX_BYTES];
ret = mbedtls_ecp_write_key( ec->grp.id, ec, &output_length, tmp, byte_length );
ret = mbedtls_ecp_write_key( ec->grp.id, ec, tmp, byte_length );
if( ret != 0 )
goto exit;
ret = mbedtls_asn1_write_octet_string( p, start, tmp, byte_length );

3
library/psa_crypto.c
View File

@ -1321,14 +1321,13 @@ static psa_status_t psa_internal_export_key( const psa_key_slot_t *slot,
if( PSA_KEY_TYPE_IS_ECC_KEY_PAIR( slot->attr.type ) && !export_public_key )
{
psa_status_t status;
size_t actual_data_size;
size_t bytes = PSA_BITS_TO_BYTES( slot->attr.bits );
if( bytes > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = mbedtls_to_psa_error(
mbedtls_ecp_write_key(slot->data.ecp->grp.id, slot->data.ecp,
&actual_data_size, data, bytes) );
data, bytes) );
if( status != PSA_SUCCESS )
return( status );
memset( data + bytes, 0, data_size - bytes );

25
tests/suites/test_suite_ecp.function
View File

@ -1089,42 +1089,29 @@ void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected, int canonic
if( canonical )
{
unsigned char buf[MBEDTLS_ECP_MAX_BYTES];
size_t olen;
ret = mbedtls_ecp_write_key( grp_id, &key, &olen, buf, in_key->len );
ret = mbedtls_ecp_write_key( grp_id, &key, buf, in_key->len );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( olen == in_key->len );
mbedtls_fprintf( stdout, "written key: ");
for( size_t i = 0; i < in_key->len; i++ ) {
mbedtls_fprintf( stdout, "%02x", buf[i]);
}
mbedtls_fprintf( stdout, "\n");
ASSERT_COMPARE( in_key->x, in_key->len,
buf, olen );
buf, in_key->len );
}
else
{
unsigned char export1[MBEDTLS_ECP_MAX_BYTES];
size_t olen1;
unsigned char export2[MBEDTLS_ECP_MAX_BYTES];
size_t olen2;
ret = mbedtls_ecp_write_key( grp_id, &key, &olen1, export1, in_key->len );
ret = mbedtls_ecp_write_key( grp_id, &key, export1, in_key->len );
TEST_ASSERT( ret == 0 );
ret = mbedtls_ecp_read_key( grp_id, &key2, export1, in_key->len );
TEST_ASSERT( ret == expected );
ret = mbedtls_ecp_write_key( grp_id, &key2, &olen2, export2, in_key->len );
ret = mbedtls_ecp_write_key( grp_id, &key2, export2, in_key->len );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( olen2 == olen1 );
ASSERT_COMPARE( export1, olen1,
export2, olen2 );
ASSERT_COMPARE( export1, in_key->len,
export2, in_key->len );
}
}