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ssl_client2: Add helper to unhexify binary command line data

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This commit is contained in:
Hanno Becker 2019-04-09 17:12:56 +01:00
parent f8542cf620
commit 1f583eecd8
1 changed files with 45 additions and 35 deletions
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80
programs/ssl/ssl_client2.c
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@ -708,6 +708,45 @@ int idle( mbedtls_net_context *fd,
return( 0 );
}
/* Unhexify `hex` into `dst`. `dst` must have
* size at least `strlen( hex ) / 2`. */
int unhexify( unsigned char const *hex, unsigned char *dst )
{
unsigned char c;
size_t j;
size_t len = strlen( hex );
if( len % 2 != 0 )
return( -1 );
for( j = 0; j < len; j += 2 )
{
c = hex[j];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
return( -1 );
dst[ j / 2 ] = c << 4;
c = hex[j + 1];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
return( -1 );
dst[ j / 2 ] |= c;
}
return( 0 );
}
int main( int argc, char *argv[] )
{
int ret = 0, len, tail_len, i, written, frags, retry_left;
@ -1257,47 +1296,18 @@ int main( int argc, char *argv[] )
*/
if( strlen( opt.psk ) )
{
unsigned char c;
size_t j;
if( strlen( opt.psk ) % 2 != 0 )
{
mbedtls_printf( "pre-shared key not valid hex\n" );
goto exit;
}
psk_len = strlen( opt.psk ) / 2;
for( j = 0; j < strlen( opt.psk ); j += 2 )
if( psk_len > sizeof( psk ) )
{
c = opt.psk[j];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
mbedtls_printf( "pre-shared key too long\n" );
goto exit;
}
if( unhexify( opt.psk, psk ) != 0 )
{
mbedtls_printf( "pre-shared key not valid hex\n" );
goto exit;
}
psk[ j / 2 ] = c << 4;
c = opt.psk[j + 1];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
{
mbedtls_printf( "pre-shared key not valid hex\n" );
goto exit;
}
psk[ j / 2 ] |= c;
}
}
#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */