From: iceman1001 <iceman@iuse.se>
Date: Tue, 16 Feb 2016 20:41:10 +0000 (+0100)
Subject: CHG: testing a prng_successor_one method
X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/ee97a92adbf2009117c6c76e82bbdb57746355ae?hp=-c

CHG: testing a prng_successor_one method
---

ee97a92adbf2009117c6c76e82bbdb57746355ae
diff --git a/armsrc/crapto1.h b/armsrc/crapto1.h
index 9262b956..7ea6fa28 100644
--- a/armsrc/crapto1.h
+++ b/armsrc/crapto1.h
@@ -32,6 +32,7 @@ uint8_t crypto1_bit(struct Crypto1State*, uint8_t, int);
 uint8_t crypto1_byte(struct Crypto1State*, uint8_t, int);
 uint32_t crypto1_word(struct Crypto1State*, uint32_t, int);
 uint32_t prng_successor(uint32_t x, uint32_t n);
+uint32_t prng_successor_one(uint32_t x);
 
 struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
 struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
diff --git a/armsrc/crypto1.c b/armsrc/crypto1.c
index 98d38b2b..993c05e7 100644
--- a/armsrc/crypto1.c
+++ b/armsrc/crypto1.c
@@ -141,3 +141,12 @@ 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);
+}
\ No newline at end of file