[S390x] Optimize scalar multiply of Curve25519 and Curve448 defined in RFC-7748
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This patch implements scalar multiply of Curve25519 and Curve448 defined in RFC-7748 (also support group functions) on S390x architecture using hardware-accelerated instruction pcc.
testsuite passes all tests of this patch.
Benchmark on z15
| Function | C | This patch |
|---|---|---|
| curve25519_mul | 366 (us) | 17 (us) |
| curve25519_mul_g | 129 (us) | 17 (us) |
| curve448_mul | 1748 (us) | 35 (us) |
| curve448_mul_g | 624 (us) | 35 (us) |