Add eddsa from ref10 implementation (with some modifications).

core/crypto/ed25519/pow225521.q

@@ -0,0 +1,61 @@
+:name:fe:t0:t1:t2:t3:t4:t5:t6:t7:t8:t9:z:out:
+fe r:var/r=fe:
+
+enter f:enter/f:>z1=fe#11:
+return:nofallthrough:<z_255_21=fe#12:leave:
+
+h=f*g:<f=fe:<g=fe:>h=fe:asm/fe_mul(>h,<f,<g);:
+h=f^2^k:<f=fe:>h=fe:#k:asm/fe_sq(>h,<f); for (i = 1;i !lt; #k;++i) fe_sq(>h,>h);:
+
+:
+
+fe z1
+fe z2
+fe z8
+fe z9
+fe z11
+fe z22
+fe z_5_0
+fe z_10_5
+fe z_10_0
+fe z_20_10
+fe z_20_0
+fe z_40_20
+fe z_40_0
+fe z_50_10
+fe z_50_0
+fe z_100_50
+fe z_100_0
+fe z_200_100
+fe z_200_0
+fe z_250_50
+fe z_250_0
+fe z_255_5
+fe z_255_21
+
+enter pow225521
+
+z2 = z1^2^1
+z8 = z2^2^2
+z9 = z1*z8
+z11 = z2*z9
+z22 = z11^2^1
+z_5_0 = z9*z22
+z_10_5 = z_5_0^2^5
+z_10_0 = z_10_5*z_5_0
+z_20_10 = z_10_0^2^10
+z_20_0 = z_20_10*z_10_0
+z_40_20 = z_20_0^2^20
+z_40_0 = z_40_20*z_20_0
+z_50_10 = z_40_0^2^10
+z_50_0 = z_50_10*z_10_0
+z_100_50 = z_50_0^2^50
+z_100_0 = z_100_50*z_50_0
+z_200_100 = z_100_0^2^100
+z_200_0 = z_200_100*z_100_0
+z_250_50 = z_200_0^2^50
+z_250_0 = z_250_50*z_50_0
+z_255_5 = z_250_0^2^5
+z_255_21 = z_255_5*z11
+
+return