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Code Issues Releases Wiki Activity

Improve ElGamal validation by refraining from biginteger for loop variable

This commit is contained in:
Paul Schaub 2022-12-15 16:28:10 +01:00
parent bfbaa30e4c
commit 6a5c6c5509
1 changed files with 5 additions and 4 deletions
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9
pgpainless-core/src/main/java/org/pgpainless/key/util/PublicKeyParameterValidationUtil.java
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@ -265,14 +265,15 @@ public class PublicKeyParameterValidationUtil {
// check g^i mod p != 1 for i < threshold
BigInteger res = g;
BigInteger i = BigInteger.valueOf(1);
BigInteger threshold = BigInteger.valueOf(2).shiftLeft(17);
while (i.compareTo(threshold) < 0) {
// 262144
int threshold = 2 << 17;
int i = 1;
while (i < threshold) {
res = res.multiply(g).mod(p);
if (res.equals(one)) {
return false;
}
i = i.add(one);
i++;
}
// blinded exponentiation to check y = g^(r*(p-1)+x) mod p