diff --git a/speck.c b/speck.c
index ade5942..a7e61d2 100644
--- a/speck.c
+++ b/speck.c
@@ -15,15 +15,32 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 #include "speck.h"
 
-#define ROR(x, r) ((x >> r) | (x << ((sizeof(SPECK_TYPE) * 8) - r)))
-#define ROL(x, r) ((x << r) | (x >> ((sizeof(SPECK_TYPE) * 8) - r)))
+#if WORDSIZE == 24
+  // rotates for word size n=24 bits
+  #define ROR(x, r) ((x >> r) | (x << (24 - r))&MASK24)&MASK24
+  #define ROL(x, r) ((x << r) | (x >> (24 - r))&MASK24)&MASK24
+#elif WORDSIZE == 48
+  #define ROR(x, r) ((x >> r) | (x << (48 - r))&MASK48)&MASK48
+  #define ROL(x, r) ((x << r) | (x >> (48 - r))&MASK48)&MASK48
+#else
+  #define ROR(x, r) ((x >> r) | (x << ((sizeof(SPECK_TYPE) * 8) - r)))
+  #define ROL(x, r) ((x << r) | (x >> ((sizeof(SPECK_TYPE) * 8) - r)))
+#endif
 
 #ifdef SPECK_32_64
-#define R(x, y, k) (x = ROR(x, 7), x += y, x ^= k, y = ROL(y, 2), y ^= x)
-#define RR(x, y, k) (y ^= x, y = ROR(y, 2), x ^= k, x -= y, x = ROL(x, 7))
+  #define R(x, y, k) (x = ROR(x, 7), x += y, x ^= k, y = ROL(y, 2), y ^= x)
+  #define RR(x, y, k) (y ^= x, y = ROR(y, 2), x ^= k, x -= y, x = ROL(x, 7))
 #else
-#define R(x, y, k) (x = ROR(x, 8), x += y, x ^= k, y = ROL(y, 3), y ^= x)
-#define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x -= y, x = ROL(x, 8))
+  #if WORDSIZE == 24
+  #define R(x, y, k) (x = ROR(x, 8), x = (x + y)&MASK24, x ^= k, y = ROL(y, 3), y ^= x)
+  #define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x = (x - y)&MASK24, x = ROL(x, 8))
+  #elif WORDSIZE == 48
+  #define R(x, y, k) (x = ROR(x, 8), x = (x + y)&MASK48, x ^= k, y = ROL(y, 3), y ^= x)
+  #define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x = (x - y)&MASK48, x = ROL(x, 8))
+  #else
+  #define R(x, y, k) (x = ROR(x, 8), x += y, x ^= k, y = ROL(y, 3), y ^= x)
+  #define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x -= y, x = ROL(x, 8))
+  #endif
 #endif
 
 void speck_expand(SPECK_TYPE const K[static SPECK_KEY_LEN], SPECK_TYPE S[static SPECK_ROUNDS])
@@ -116,12 +133,36 @@ int main(int argc, char** argv)
   uint16_t enc[2] = {0x42f2, 0xa868};
 #endif
 
+#ifdef SPECK_48_72
+  uint32_t key[3] = {0x020100, 0x0a0908, 0x121110};
+  uint32_t plain[2] = {0x6c6172, 0x20796c};
+  uint32_t enc[2] = {0x385adc, 0xc049a5};
+#endif
+
+#ifdef SPECK_48_96
+  uint32_t key[4] = {0x020100, 0x0a0908, 0x121110, 0x1a1918};
+  uint32_t plain[2] = {0x696874, 0x6d2073};
+  uint32_t enc[2] = {0xb6445d, 0x735e10};
+#endif
+
 #ifdef SPECK_64_128
   uint32_t key[4] = {0x03020100, 0x0b0a0908, 0x13121110, 0x1b1a1918};
   uint32_t plain[2] = {0x7475432d, 0x3b726574};
   uint32_t enc[2] = {0x454e028b, 0x8c6fa548};
 #endif
 
+#ifdef SPECK_96_96
+  uint64_t key[2] = {0x050403020100, 0x0d0c0b0a0908};
+  uint64_t plain[2] = {0x656761737520, 0x65776f68202c};
+  uint64_t enc[2] = {0x62bdde8f79aa, 0x9e4d09ab7178};
+#endif
+
+#ifdef SPECK_96_144
+  uint64_t key[3] = {0x050403020100, 0x0d0c0b0a0908, 0x151413121110};
+  uint64_t plain[2] = {0x69202c726576, 0x656d6974206e};
+  uint64_t enc[2] = {0x7ae440252ee6, 0x2bf31072228a};
+#endif
+
 #ifdef SPECK_128_256
   uint64_t key[4] = {0x0706050403020100, 0x0f0e0d0c0b0a0908, 0x1716151413121110, 0x1f1e1d1c1b1a1918};
   uint64_t plain[2] = {0x202e72656e6f6f70, 0x65736f6874206e49};
@@ -155,4 +196,4 @@ int main(int argc, char** argv)
   return 0;
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/speck.h b/speck.h
index af01060..46cabc6 100644
--- a/speck.h
+++ b/speck.h
@@ -22,6 +22,9 @@ extern "C" {
 
 #include <stdint.h>
 
+#define MASK24 0xFFFFFF
+#define MASK48 0xFFFFFFFFFFFF
+
 /*
  * define speck type to use (one of SPECK_32_64, SPECK_64_128, SPECK_128_256)
  */
@@ -33,12 +36,40 @@ extern "C" {
 #define SPECK_KEY_LEN 4
 #endif
 
+#ifdef SPECK_48_72
+#define SPECK_TYPE uint32_t
+#define SPECK_ROUNDS 22
+#define SPECK_KEY_LEN 3
+#define WORDSIZE 24
+#endif
+
+#ifdef SPECK_48_96
+#define SPECK_TYPE uint32_t
+#define SPECK_ROUNDS 23
+#define SPECK_KEY_LEN 4
+#define WORDSIZE 24
+#endif
+
 #ifdef SPECK_64_128
 #define SPECK_TYPE uint32_t
 #define SPECK_ROUNDS 27
 #define SPECK_KEY_LEN 4
 #endif
 
+#ifdef SPECK_96_96
+#define SPECK_TYPE uint64_t
+#define SPECK_ROUNDS 28
+#define SPECK_KEY_LEN 2
+#define WORDSIZE 48
+#endif
+
+#ifdef SPECK_96_144
+#define SPECK_TYPE uint64_t
+#define SPECK_ROUNDS 29
+#define SPECK_KEY_LEN 3
+#define WORDSIZE 48
+#endif
+
 #ifdef SPECK_128_256
 #define SPECK_TYPE uint64_t
 #define SPECK_ROUNDS 34
@@ -56,4 +87,4 @@ void speck_decrypt_combined(SPECK_TYPE const ct[static 2], SPECK_TYPE pt[static
 }
 #endif
 
-#endif
\ No newline at end of file
+#endif