Commit 292996c3 authored by robertdavidgraham's avatar robertdavidgraham
Browse files

decrypt

parent c05a9760

src/rand-blackrock.c

+24 −5
Original line number Diff line number Diff line
@@ -209,9 +209,9 @@ fe(unsigned r, uint64_t a, uint64_t b, uint64_t m, uint64_t seed) 
static inline uint64_t

unfe(unsigned r, uint64_t a, uint64_t b, uint64_t m, uint64_t seed)

{

    uint64_t L, R;

    int64_t L, R;

    unsigned j;

    uint64_t tmp;

    int64_t tmp;



    if (r & 1) {

		R = m % a;
@@ -223,9 +223,27 @@ unfe(unsigned r, uint64_t a, uint64_t b, uint64_t m, uint64_t seed) 


    for (j=r; j>=1; j--) {

        if (j & 1) {

            tmp = (R - F(j, L, seed)) % a;

            tmp = F(j, L, seed);

            if (tmp > R) {

                tmp = (tmp - R);

                tmp = a - (tmp%a);

                if (tmp == a)

                    tmp = 0;

            } else {

            tmp = (R - F(j, L, seed)) % b;

                tmp = (R - tmp);

                tmp %= a;

            }

        } else {

            tmp = F(j, L, seed);

            if (tmp > R) {

                tmp = (tmp - R);

                tmp = b - (tmp%b);

                if (tmp == b)

                    tmp = 0;

            } else {

                tmp = (R - tmp);

                tmp %= b;

            }

        }

        R = L;

        L = tmp;
@@ -321,7 +339,8 @@ blackrock_selftest() 
		for (i=0; i<10; i++) {

			result = blackrock_shuffle(&br, i);

			result2 = blackrock_unshuffle(&br, result);

			//i == result2

			if (i != result2)

                return 1; /*fail*/

		}



	}