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Add little endian import to Bignum

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The function `mbedtls_mpi_read_binary()` expects big endian byte order,
but we need to be able to read from little endian in some caseses. (For
example when handling keys corresponding to Montgomery curves.)

Used `echo xx | tac -rs .. | tr [a-z] [A-Z]` to transform the test data
to little endian and `echo "ibase=16;xx" | bc` to convert to decimal.
This commit is contained in:
Janos Follath
2019-02-13 10:28:28 +00:00
parent 3081629de4
commit a778a94b7d
4 changed files with 68 additions and 2 deletions
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19
tests/suites/test_suite_mpi.function
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@ -328,6 +328,25 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_read_binary_le( data_t * buf, int radix_A, char * input_A )
{
mbedtls_mpi X;
unsigned char str[1000];
size_t len;
mbedtls_mpi_init( &X );
TEST_ASSERT( mbedtls_mpi_read_binary_le( &X, buf->x, buf->len ) == 0 );
TEST_ASSERT( mbedtls_mpi_write_string( &X, radix_A, (char *) str, sizeof( str ), &len ) == 0 );
TEST_ASSERT( strcmp( (char *) str, input_A ) == 0 );
exit:
mbedtls_mpi_free( &X );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_mpi_write_binary( int radix_X, char * input_X,
data_t * input_A, int output_size,