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Minor comments improvement

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This commit is contained in:
Hanno Becker 2017-08-25 08:03:13 +01:00
parent d363799a9d
commit d9431a7817
1 changed files with 20 additions and 9 deletions
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29
library/rsa.c
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@ -74,16 +74,24 @@ static void mbedtls_zeroize( void *v, size_t n ) {
/* /*
* Context-independent RSA helper functions. * Context-independent RSA helper functions.
* *
* The following three functions * There are two classes of helper functions:
* - mbedtls_rsa_deduce_moduli * (1) Parameter-generating helpers. These are:
* - mbedtls_rsa_deduce_private * - mbedtls_rsa_deduce_moduli
* - mbedtls_rsa_check_params * - mbedtls_rsa_deduce_private
* are helper functions operating on the core RSA parameters * - mbedtls_rsa_deduce_crt
* (represented as MPI's). They do not use the RSA context structure * Each of these functions takes a set of core RSA parameters
* and therefore need not be replaced when providing an alternative * and generates some other, or CRT related parameters.
* RSA implementation. * (2) Parameter-checking helpers. These are:
* - mbedtls_rsa_validate_params
* - mbedtls_rsa_validate_crt
* They take a set of core or CRT related RSA parameters
* and check their validity.
* *
* Their purpose is to provide common MPI operations in the context * The helper functions do not use the RSA context structure
* and therefore do not need to be replaced when providing
* an alternative RSA implementation.
*
* Their main purpose is to provide common MPI operations in the context
* of RSA that can be easily shared across multiple implementations. * of RSA that can be easily shared across multiple implementations.
*/ */
@ -504,18 +512,21 @@ int mbedtls_rsa_deduce_crt( const mbedtls_mpi *P, const mbedtls_mpi *Q,
mbedtls_mpi K; mbedtls_mpi K;
mbedtls_mpi_init( &K ); mbedtls_mpi_init( &K );
/* DP = D mod P-1 */
if( DP != NULL ) if( DP != NULL )
{ {
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &K, P, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &K, P, 1 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( DP, D, &K ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( DP, D, &K ) );
} }
/* DQ = D mod Q-1 */
if( DQ != NULL ) if( DQ != NULL )
{ {
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &K, Q, 1 ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &K, Q, 1 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( DQ, D, &K ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( DQ, D, &K ) );
} }
/* QP = Q^{-1} mod P */
if( QP != NULL ) if( QP != NULL )
{ {
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( QP, Q, P ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( QP, Q, P ) );