started fixing the paritiy == 0 special attack against chinese clones with bad prng...

[proxmark3-svn] / armsrc / crypto1.c

diff --git a/armsrc/crypto1.c b/armsrc/crypto1.c
index 98d38b2bf2189ad4a65047e263669e6a67b53c84..68cb9b4e54064b22d849fa70ae2de748454d8761 100644 (file)
--- a/armsrc/crypto1.c
+++ b/armsrc/crypto1.c
@@ -141,3 +141,13 @@ uint32_t prng_successor(uint32_t x, uint32_t n)
 
        return SWAPENDIAN(x);
 }
+
+uint32_t prng_successor_one(uint32_t x)
+{
+       SWAPENDIAN(x);
+
+       x = x >> 1 | (x >> 16 ^ x >> 18 ^ x >> 19 ^ x >> 21) << 31;
+
+       return SWAPENDIAN(x);
+}
+