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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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3
tests/suites/test_suite_mpi.data
View File

@ -58,6 +58,9 @@ mpi_read_write_string:16:"-1":16:"":3:0:MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL
Base test mbedtls_mpi_read_binary #1
mbedtls_mpi_read_binary:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":10:"56125680981752282334141896320372489490613963693556392520816017892111350604111697682705498319512049040516698827829292076808006940873974979584527073481012636016353913462376755556720019831187364993587901952757307830896531678727717924"
Base test mbedtls_mpi_read_binary_le #1
mbedtls_mpi_read_binary_le:"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":10:"219946662473865722255717126709915431768051735954189829340600976826409773245337023925691629251672268961177825243440202069039100741562168093042339401187848509859789949044607421190014088260008793380554914226244485299326152319899746569"
Base test mbedtls_mpi_write_binary #1
mbedtls_mpi_write_binary:10:"56125680981752282334141896320372489490613963693556392520816017892111350604111697682705498319512049040516698827829292076808006940873974979584527073481012636016353913462376755556720019831187364993587901952757307830896531678727717924":"0941379d00fed1491fe15df284dfde4a142f68aa8d412023195cee66883e6290ffe703f4ea5963bf212713cee46b107c09182b5edcd955adac418bf4918e2889af48e1099d513830cec85c26ac1e158b52620e33ba8692f893efbb2f958b4424":200:0

19
tests/suites/test_suite_mpi.function
View File

@ -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,