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Member "ntl-11.5.1/src/CheckKMA.cpp" (23 Jun 2021, 891 Bytes) of package /linux/misc/ntl-11.5.1.tar.gz:

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    1 #include <NTL/ctools.h>
    2 #include <NTL/linux_s390x.h>
    3 
    4 #include <cstdlib>
    5 #include <iostream>
    6 
    7 
    8 using namespace std;
    9 
   10 #if !defined(LINUX_S390X)
   11 #error "KMA not supported"
   12 #endif
   13 
   14 int main()
   15 {
   16 #if defined(AT_HWCAP) && defined(HWCAP_S390_STFLE)
   17    unsigned long hwcap, facility_list_nmemb;
   18    uint64_t status_word[2], facility_list[3];
   19 
   20    /* Check for STFLE. */
   21    hwcap = getauxval(AT_HWCAP);
   22    if (!(hwcap & HWCAP_S390_STFLE))
   23       return -1;
   24 
   25    /* Query facility list. */
   26    facility_list_nmemb = stfle(facility_list, 3);
   27 
   28    /* Check MSA8. */
   29    if (facility_list_nmemb >= OFF64(MSA8) + 1
   30        && (facility_list[OFF64(MSA8)] & MASK64(MSA8))) {
   31          cpacf_kma(CPACF_KMA_QUERY, &status_word, NULL, NULL, 0, NULL, 0);
   32 
   33          if (status_word[OFF64(CPACF_KMA_GCM_AES_256)]
   34              & MASK64(CPACF_KMA_GCM_AES_256)) {
   35             return 0;
   36          }
   37    }
   38 #endif
   39    return -1;
   40 }