diff options
Diffstat (limited to 'src/crypto/shen_ed25519_ref/ref10/base2.py')
-rw-r--r-- | src/crypto/shen_ed25519_ref/ref10/base2.py | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/src/crypto/shen_ed25519_ref/ref10/base2.py b/src/crypto/shen_ed25519_ref/ref10/base2.py deleted file mode 100644 index 5e4e8739d..000000000 --- a/src/crypto/shen_ed25519_ref/ref10/base2.py +++ /dev/null @@ -1,60 +0,0 @@ -b = 256 -q = 2**255 - 19 -l = 2**252 + 27742317777372353535851937790883648493 - -def expmod(b,e,m): - if e == 0: return 1 - t = expmod(b,e/2,m)**2 % m - if e & 1: t = (t*b) % m - return t - -def inv(x): - return expmod(x,q-2,q) - -d = -121665 * inv(121666) -I = expmod(2,(q-1)/4,q) - -def xrecover(y): - xx = (y*y-1) * inv(d*y*y+1) - x = expmod(xx,(q+3)/8,q) - if (x*x - xx) % q != 0: x = (x*I) % q - if x % 2 != 0: x = q-x - return x - -By = 4 * inv(5) -Bx = xrecover(By) -B = [Bx % q,By % q] - -def edwards(P,Q): - x1 = P[0] - y1 = P[1] - x2 = Q[0] - y2 = Q[1] - x3 = (x1*y2+x2*y1) * inv(1+d*x1*x2*y1*y2) - y3 = (y1*y2+x1*x2) * inv(1-d*x1*x2*y1*y2) - return [x3 % q,y3 % q] - -def radix255(x): - x = x % q - if x + x > q: x -= q - x = [x,0,0,0,0,0,0,0,0,0] - bits = [26,25,26,25,26,25,26,25,26,25] - for i in range(9): - carry = (x[i] + 2**(bits[i]-1)) / 2**bits[i] - x[i] -= carry * 2**bits[i] - x[i + 1] += carry - result = "" - for i in range(9): - result = result+str(x[i])+"," - result = result+str(x[9]) - return result - -Bi = B - -for i in range(8): - print " {" - print " {",radix255(Bi[1]+Bi[0]),"}," - print " {",radix255(Bi[1]-Bi[0]),"}," - print " {",radix255(2*d*Bi[0]*Bi[1]),"}," - print " }," - Bi = edwards(B,edwards(B,Bi)) |