[U-Boot] tools/mxsimage: Support building with LibreSSL

[Hauke Mehrtens]

On 03/17/2018 03:47 PM, Marek Vasut wrote:
> On 03/17/2018 01:23 PM, Hauke Mehrtens wrote:
>> The mxsimage utility fails to compile against LibreSSL because LibreSSL
>> says it is OpenSSL 2.0, but it does not support the complete OpenSSL 1.1
>> interface.
> 
> The mxsimage does support OpenSSL 1.1 , the commit message is confusing.
> Can you elaborate on that and reword the last part ?

libressl defines the following in version 2.7.4:
#define OPENSSL_VERSION_NUMBER	0x20000000L
#define LIBRESSL_VERSION_NUMBER	0x2060400fL
see here:
https://github.com/libressl-portable/openbsd/blob/OPENBSD_6_2/src/lib/libcrypto/opensslv.h

But OPENSSL_zalloc() is not provided by libressl, that is only available
in OpeSSL 1.1.0 and later.
I do not know if libressl plans to add  functions like OPENSSL_zalloc()
in the future, but currently it is not included and we always have to
use the backward compatible code when compiling against libressl.

>> Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
>> ---
>>  tools/mxsimage.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/mxsimage.c b/tools/mxsimage.c
>> index 32a7978cae..0cbf007dff 100644
>> --- a/tools/mxsimage.c
>> +++ b/tools/mxsimage.c
>> @@ -26,7 +26,7 @@
>>   * OpenSSL 1.1.0 and newer compatibility functions:
>>   * https://wiki.openssl.org/index.php/1.1_API_Changes
>>   */
>> -#if OPENSSL_VERSION_NUMBER < 0x10100000L
>> +#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
> 
> This should check for the libressl version number value too I think?
> 
>>  static void *OPENSSL_zalloc(size_t num)
>>  {
>>  	void *ret = OPENSSL_malloc(num);
>>
> 
>