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- Expanded rsa_check_privkey() to check DP, DQ and QP as well

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This commit is contained in:
Paul Bakker 2012-09-27 13:21:34 +00:00
parent 5ef9db2ae3
commit 321df6fb80
1 changed files with 11 additions and 5 deletions
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16
library/rsa.c
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@ -161,7 +161,7 @@ int rsa_check_pubkey( const rsa_context *ctx )
int rsa_check_privkey( const rsa_context *ctx )
{
int ret;
mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2;
mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2, DP, DQ, QP;
if( ( ret = rsa_check_pubkey( ctx ) ) != 0 )
return( ret );
@ -171,7 +171,8 @@ int rsa_check_privkey( const rsa_context *ctx )
mpi_init( &PQ ); mpi_init( &DE ); mpi_init( &P1 ); mpi_init( &Q1 );
mpi_init( &H ); mpi_init( &I ); mpi_init( &G ); mpi_init( &G2 );
mpi_init( &L1 ); mpi_init( &L2 );
mpi_init( &L1 ); mpi_init( &L2 ); mpi_init( &DP ); mpi_init( &DQ );
mpi_init( &QP );
MPI_CHK( mpi_mul_mpi( &PQ, &ctx->P, &ctx->Q ) );
MPI_CHK( mpi_mul_mpi( &DE, &ctx->D, &ctx->E ) );
@ -184,23 +185,28 @@ int rsa_check_privkey( const rsa_context *ctx )
MPI_CHK( mpi_div_mpi( &L1, &L2, &H, &G2 ) );
MPI_CHK( mpi_mod_mpi( &I, &DE, &L1 ) );
MPI_CHK( mpi_mod_mpi( &DP, &ctx->D, &P1 ) );
MPI_CHK( mpi_mod_mpi( &DQ, &ctx->D, &Q1 ) );
MPI_CHK( mpi_inv_mod( &QP, &ctx->Q, &ctx->P ) );
/*
* Check for a valid PKCS1v2 private key
*/
if( mpi_cmp_mpi( &PQ, &ctx->N ) != 0 ||
mpi_cmp_mpi( &DP, &ctx->DP ) != 0 ||
mpi_cmp_mpi( &DQ, &ctx->DQ ) != 0 ||
mpi_cmp_mpi( &QP, &ctx->QP ) != 0 ||
mpi_cmp_int( &L2, 0 ) != 0 ||
mpi_cmp_int( &I, 1 ) != 0 ||
mpi_cmp_int( &G, 1 ) != 0 )
{
ret = POLARSSL_ERR_RSA_KEY_CHECK_FAILED;
}
cleanup:
mpi_free( &PQ ); mpi_free( &DE ); mpi_free( &P1 ); mpi_free( &Q1 );
mpi_free( &H ); mpi_free( &I ); mpi_free( &G ); mpi_free( &G2 );
mpi_free( &L1 ); mpi_free( &L2 );
mpi_free( &L1 ); mpi_free( &L2 ); mpi_free( &DP ); mpi_free( &DQ );
mpi_free( &QP );
if( ret == POLARSSL_ERR_RSA_KEY_CHECK_FAILED )
return( ret );