Times to do a private key encryption, done via the 
x509 -signkey test1024 <testcert
LLONG stands for the LONGLONG variable being defined in rsa/bn.h

80486dx/50MHz Solaris 2.4 - gcc -O2 (gcc 2.6.3)
     Normal   LLONG
 512   0.77    0.52
1024   5.03    3.10
2048  37.81   22.11
3072          73.75

RS6000/??? AIX 3.2 - cc -O (LLONG generate bad code)
     Normal
 512   0.48
1024   2.91
2048  20.92

Sparc 10 Solaris 2.3 - gcc -O2 (gcc 2.6.3) / cc -fast (SC3.0)
        gcc gccLLONG       cc  ccLLONG
 512   0.60     0.43     0.24     0.33
1024   4.25     2.89     1.52     2.15
2048  31.95    21.74    10.86    15.95
3072                    36.22

DGUX 8500/88110 gcc -O2 (gcc 2.5.7)
     Normal   LLONG
 512   0.20    0.25
1024   1.19    1.63
2048   8.43   11.86
3072  27.96   33.66

SGI challange IRIX 5.3 (200mhz MIPS R4400) cc -O2
     Normal   LLONG
 512   0.11    0.13
1024   0.72    0.88
2048   5.29    6.46
3072  17.76   21.68
4096  41.78

HP-UX 9000/887 HPUX 9.04 cc +O4 / gcc -O2 (gcc 2.5.7)
         cc     gcc gccLLONG
 512   0.44    0.14     0.09
1024   3.21    0.88     0.48
2048  24.45    6.30     3.17
3072          21.05    10.44
4096                   24.17

DEC Alpha OSF1 V3.0 cc -O2 (64bit) (LLONG generates bad code)
      64bit   32bit
 512   0.05    0.16
1024   0.31    1.20
2048   2.18    8.85
3072   7.15   29.93
4096  16.78

