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scalarmult: import curve methods; be standard

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This commit is contained in:
Christophe Diederichs 2020-06-16 15:53:27 +02:00
parent 8aae7efea2
commit 67a4ba77cb
1 changed files with 53 additions and 52 deletions
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105
crypto_scalarmult.js
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@ -1,3 +1,5 @@
const { _9, _121665, gf, inv25519, pack25519, unpack25519, sel25519, A, M, Z, S } = require('./ed25519.js')
module.exports = {
crypto_scalarmult,
crypto_scalarmult_base,
@ -5,60 +7,60 @@ module.exports = {
crypto_scalarmult_SCALARBYTES
}
function crypto_scalarmult(q, n, p) {
function crypto_scalarmult (q, n, p) {
check(q, crypto_scalarmult_BYTES)
check(n, crypto_scalarmult_SCALARBYTES)
check(p, crypto_scalarmult_BYTES)
var z = new Uint8Array(32);
var x = new Float64Array(80), r, i;
var z = new Uint8Array(32)
var x = new Float64Array(80), r, i
var a = gf(), b = gf(), c = gf(),
d = gf(), e = gf(), f = gf();
for (i = 0; i < 31; i++) z[i] = n[i];
z[31]=(n[31]&127)|64;
z[0]&=248;
unpack25519(x,p);
d = gf(), e = gf(), f = gf()
for (i = 0; i < 31; i++) z[i] = n[i]
z[31] = (n[31] & 127) | 64
z[0] &= 248
unpack25519(x, p)
for (i = 0; i < 16; i++) {
b[i]=x[i];
d[i]=a[i]=c[i]=0;
b[i] = x[i]
d[i] = a[i] = c[i] = 0
}
a[0]=d[0]=1;
for (i=254; i>=0; --i) {
r=(z[i>>>3]>>>(i&7))&1;
sel25519(a,b,r);
sel25519(c,d,r);
A(e,a,c);
Z(a,a,c);
A(c,b,d);
Z(b,b,d);
S(d,e);
S(f,a);
M(a,c,a);
M(c,b,e);
A(e,a,c);
Z(a,a,c);
S(b,a);
Z(c,d,f);
M(a,c,_121665);
A(a,a,d);
M(c,c,a);
M(a,d,f);
M(d,b,x);
S(b,e);
sel25519(a,b,r);
sel25519(c,d,r);
a[0] = d[0] = 1
for (i = 254; i >= 0; --i) {
r = (z[i >>> 3] >>> (i & 7)) & 1
sel25519(a, b, r)
sel25519(c, d, r)
A(e, a, c)
Z(a, a, c)
A(c, b, d)
Z(b, b, d)
S(d, e)
S(f, a)
M(a, c, a)
M(c, b, e)
A(e, a, c)
Z(a, a, c)
S(b, a)
Z(c, d, f)
M(a, c, _121665)
A(a, a, d)
M(c, c, a)
M(a, d, f)
M(d, b, x)
S(b, e)
sel25519(a, b, r)
sel25519(c, d, r)
}
for (i = 0; i < 16; i++) {
x[i+16]=a[i];
x[i+32]=c[i];
x[i+48]=b[i];
x[i+64]=d[i];
x[i + 16] = a[i]
x[i + 32] = c[i]
x[i + 48] = b[i]
x[i + 64] = d[i]
}
var x32 = x.subarray(32);
var x16 = x.subarray(16);
inv25519(x32,x32);
M(x16,x16,x32);
pack25519(q,x16);
return 0;
var x32 = x.subarray(32)
var x16 = x.subarray(16)
inv25519(x32, x32)
M(x16, x16, x32)
pack25519(q, x16)
return 0
}
module.exports = {
@ -68,15 +70,14 @@ module.exports = {
crypto_scalarmult_SCALARBYTES
}
function crypto_scalarmult_base(q, n) {
return crypto_scalarmult(q, n, _9);
function crypto_scalarmult_base (q, n) {
return crypto_scalarmult(q, n, _9)
}
function check (buf, len) {
if (!buf || (len && buf.length < len)) throw new Error('Argument must be a buffer' + (len ? ' of length ' + len : ''))
}
var crypto_scalarmult_BYTES,
crypto_scalarmult_SCALARBYTES = 32,
crypto_scalarmult_BYTES,
crypto_scalarmult_SCALARBYTES = 32
var crypto_scalarmult_BYTES = 32
var crypto_scalarmult_SCALARBYTES = 32
var crypto_scalarmult_BYTES = 32
var crypto_scalarmult_SCALARBYTES = 32