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Blind RSA operations even without CRT

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Manuel Pégourié-Gonnard 2014-11-06 18:15:12 +01:00
parent d056ce0e3e
commit e10e06d863
3 changed files with 6 additions and 17 deletions
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1
ChangeLog
View file

@ -5,6 +5,7 @@ PolarSSL ChangeLog (Sorted per branch, date)
Changes
* Use deterministic nonces for AEAD ciphers in TLS by default (possible to
switch back to random with POLARSSL_SSL_AEAD_RANDOM_IV in config.h).
* Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
= PolarSSL 1.3.9 released 2014-10-20
Security

2
include/polarssl/rsa.h
View file

@ -99,10 +99,8 @@ typedef struct
mpi RP; /*!< cached R^2 mod P */
mpi RQ; /*!< cached R^2 mod Q */
#if !defined(POLARSSL_RSA_NO_CRT)
mpi Vi; /*!< cached blinding value */
mpi Vf; /*!< cached un-blinding value */
#endif
int padding; /*!< RSA_PKCS_V15 for 1.5 padding and
RSA_PKCS_v21 for OAEP/PSS */

20
library/rsa.c
View file

@ -275,7 +275,6 @@ cleanup:
return( 0 );
}
#if !defined(POLARSSL_RSA_NO_CRT)
/*
* Generate or update blinding values, see section 10 of:
* KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,
@ -329,7 +328,6 @@ cleanup:
return( ret );
}
#endif /* !POLARSSL_RSA_NO_CRT */
/*
* Do an RSA private key operation
@ -343,7 +341,6 @@ int rsa_private( rsa_context *ctx,
int ret;
size_t olen;
mpi T, T1, T2;
#if !defined(POLARSSL_RSA_NO_CRT)
mpi *Vi, *Vf;
/*
@ -361,7 +358,6 @@ int rsa_private( rsa_context *ctx,
Vi = &ctx->Vi;
Vf = &ctx->Vf;
#endif
#endif /* !POLARSSL_RSA_NO_CRT */
mpi_init( &T ); mpi_init( &T1 ); mpi_init( &T2 );
@ -372,11 +368,6 @@ int rsa_private( rsa_context *ctx,
return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
}
#if defined(POLARSSL_RSA_NO_CRT)
((void) f_rng);
((void) p_rng);
MPI_CHK( mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
#else
if( f_rng != NULL )
{
/*
@ -388,6 +379,9 @@ int rsa_private( rsa_context *ctx,
MPI_CHK( mpi_mod_mpi( &T, &T, &ctx->N ) );
}
#if defined(POLARSSL_RSA_NO_CRT)
MPI_CHK( mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
#else
/*
* faster decryption using the CRT
*
@ -409,6 +403,7 @@ int rsa_private( rsa_context *ctx,
*/
MPI_CHK( mpi_mul_mpi( &T1, &T, &ctx->Q ) );
MPI_CHK( mpi_add_mpi( &T, &T2, &T1 ) );
#endif /* POLARSSL_RSA_NO_CRT */
if( f_rng != NULL )
{
@ -419,14 +414,13 @@ int rsa_private( rsa_context *ctx,
MPI_CHK( mpi_mul_mpi( &T, &T, Vf ) );
MPI_CHK( mpi_mod_mpi( &T, &T, &ctx->N ) );
}
#endif /* POLARSSL_RSA_NO_CRT */
olen = ctx->len;
MPI_CHK( mpi_write_binary( &T, output, olen ) );
cleanup:
mpi_free( &T ); mpi_free( &T1 ); mpi_free( &T2 );
#if !defined(POLARSSL_RSA_NO_CRT) && defined(POLARSSL_THREADING_C)
#if defined(POLARSSL_THREADING_C)
mpi_free( &Vi_copy ); mpi_free( &Vf_copy );
#endif
@ -1425,10 +1419,8 @@ int rsa_copy( rsa_context *dst, const rsa_context *src )
MPI_CHK( mpi_copy( &dst->RP, &src->RP ) );
MPI_CHK( mpi_copy( &dst->RQ, &src->RQ ) );
#if !defined(POLARSSL_RSA_NO_CRT)
MPI_CHK( mpi_copy( &dst->Vi, &src->Vi ) );
MPI_CHK( mpi_copy( &dst->Vf, &src->Vf ) );
#endif
dst->padding = src->padding;
dst->hash_id = src->hash_id;
@ -1445,9 +1437,7 @@ cleanup:
*/
void rsa_free( rsa_context *ctx )
{
#if !defined(POLARSSL_RSA_NO_CRT)
mpi_free( &ctx->Vi ); mpi_free( &ctx->Vf );
#endif
mpi_free( &ctx->RQ ); mpi_free( &ctx->RP ); mpi_free( &ctx->RN );
mpi_free( &ctx->QP ); mpi_free( &ctx->DQ ); mpi_free( &ctx->DP );
mpi_free( &ctx->Q ); mpi_free( &ctx->P ); mpi_free( &ctx->D );