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Better fix for empty password / salt

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Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2021-11-18 14:02:21 +00:00
parent a59cc3dbc7
commit 7412eb4bc2
1 changed files with 58 additions and 20 deletions
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78
library/pkcs12.c
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@ -244,8 +244,6 @@ static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
data_len -= use_len;
}
}
else
memset( data, 0, data_len );
}
int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
@ -258,9 +256,12 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
unsigned char diversifier[128];
unsigned char salt_block[128], pwd_block[128], hash_block[128];
unsigned char empty_string[2] = { 0, 0 };
unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
unsigned char *p;
unsigned char c;
int use_password = 0;
int use_salt = 0;
size_t hlen, use_len, v, i;
@ -274,6 +275,12 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
if( pwd == NULL && pwdlen != 0 )
return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
if( salt == NULL && saltlen != 0 )
return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
use_password = ( pwd && pwdlen != 0 );
use_salt = ( salt && saltlen != 0 );
md_info = mbedtls_md_info_from_type( md_type );
if( md_info == NULL )
return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
@ -291,8 +298,15 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
memset( diversifier, (unsigned char) id, v );
pkcs12_fill_buffer( salt_block, v, salt, saltlen );
pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
if( use_salt != 0 )
{
pkcs12_fill_buffer( salt_block, v, salt, saltlen );
}
if( use_password != 0 )
{
pkcs12_fill_buffer( pwd_block, v, pwd, pwdlen );
}
p = data;
while( datalen > 0 )
@ -304,11 +318,29 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
goto exit;
if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
goto exit;
if( use_salt != 0 )
{
if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v )) != 0 )
goto exit;
}
else
{
if( ( ret = mbedtls_md_update( &md_ctx, empty_string,
sizeof( empty_string ) )) != 0 )
goto exit;
}
if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
goto exit;
if( use_password != 0)
{
if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v )) != 0 )
goto exit;
}
else
{
if( ( ret = mbedtls_md_update( &md_ctx, empty_string,
sizeof( empty_string ) )) != 0 )
goto exit;
}
if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
goto exit;
@ -336,22 +368,28 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
if( ++hash_block[i - 1] != 0 )
break;
// salt_block += B
c = 0;
for( i = v; i > 0; i-- )
if( use_salt != 0 )
{
j = salt_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1( j );
salt_block[i - 1] = MBEDTLS_BYTE_0( j );
// salt_block += B
c = 0;
for( i = v; i > 0; i-- )
{
j = salt_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1( j );
salt_block[i - 1] = MBEDTLS_BYTE_0( j );
}
}
// pwd_block += B
c = 0;
for( i = v; i > 0; i-- )
if( use_password != 0 )
{
j = pwd_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1( j );
pwd_block[i - 1] = MBEDTLS_BYTE_0( j );
// pwd_block += B
c = 0;
for( i = v; i > 0; i-- )
{
j = pwd_block[i - 1] + hash_block[i - 1] + c;
c = MBEDTLS_BYTE_1( j );
pwd_block[i - 1] = MBEDTLS_BYTE_0( j );
}
}
}