yuzu/mbedtls
1
0
Fork 0
mirror of https://github.com/yuzu-emu/mbedtls.git synced 2025-05-31 09:57:13 +00:00
Code Issues Packages Projects Releases Wiki Activity

Handle encryption with private key and decryption with public key as per RFC 2313

Browse source 
(cherry picked from commit e6ee41f932)
This commit is contained in:
Paul Bakker 2013-01-16 13:26:56 +01:00
parent c048493374
commit 5f5593a30e
2 changed files with 52 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
ChangeLog
View file

@ -16,6 +16,8 @@ Bugfix
Pégourié-Gonnard)
* Added max length check for rsa_pkcs1_sign with PKCS#1 v2.1
* Memory leak when using RSA_PKCS_V21 operations fixed
* Handle encryption with private key and decryption with public key as per
RFC 2313
Security
* Fixed potential memory zeroization on miscrafted RSA key (found by Eloi

67
library/rsa.c
View file

@ -386,23 +386,34 @@ int rsa_pkcs1_encrypt( rsa_context *ctx,
nb_pad = olen - 3 - ilen;
*p++ = 0;
*p++ = RSA_CRYPT;
while( nb_pad-- > 0 )
if( mode == RSA_PUBLIC )
{
int rng_dl = 100;
*p++ = RSA_CRYPT;
do {
ret = f_rng( p_rng, p, 1 );
} while( *p == 0 && --rng_dl && ret == 0 );
while( nb_pad-- > 0 )
{
int rng_dl = 100;
// Check if RNG failed to generate data
//
if( rng_dl == 0 || ret != 0)
return POLARSSL_ERR_RSA_RNG_FAILED + ret;
do {
ret = f_rng( p_rng, p, 1 );
} while( *p == 0 && --rng_dl && ret == 0 );
p++;
// Check if RNG failed to generate data
//
if( rng_dl == 0 || ret != 0)
return POLARSSL_ERR_RSA_RNG_FAILED + ret;
p++;
}
}
else
{
*p++ = RSA_SIGN;
while( nb_pad-- > 0 )
*p++ = 0xFF;
}
*p++ = 0;
memcpy( p, input, ilen );
break;
@ -476,6 +487,7 @@ int rsa_pkcs1_decrypt( rsa_context *ctx,
int ret;
size_t ilen;
unsigned char *p;
unsigned char bt;
unsigned char buf[1024];
#if defined(POLARSSL_PKCS1_V21)
unsigned char lhash[POLARSSL_MD_MAX_SIZE];
@ -502,16 +514,37 @@ int rsa_pkcs1_decrypt( rsa_context *ctx,
{
case RSA_PKCS_V15:
if( *p++ != 0 || *p++ != RSA_CRYPT )
if( *p++ != 0 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
while( *p != 0 )
bt = *p++;
if( ( bt != RSA_CRYPT && mode == RSA_PRIVATE ) ||
( bt != RSA_SIGN && mode == RSA_PUBLIC ) )
{
if( p >= buf + ilen - 1 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
}
if( bt == RSA_CRYPT )
{
while( *p != 0 && p < buf + ilen - 1 )
p++;
if( *p != 0 || p >= buf + ilen - 1 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
p++;
else
{
while( *p == 0xFF && p < buf + ilen - 1 )
p++;
if( *p != 0 || p >= buf + ilen - 1 )
return( POLARSSL_ERR_RSA_INVALID_PADDING );
p++;
}
break;
#if defined(POLARSSL_PKCS1_V21)