--- /dev/null
+#define POLY 0x04c11db7
+
+/* Theory of operation:
+ * (arm-elf-objdump -b binary -m arm -M reg-names-raw -D RSB_S2_SINGLE.bin)
+ *
+ * 440: push {r4, r5, r6, r7, r8, r9, r10, r11, r14}
+ * 444: mov r11, r0
+ * 448: mov r10, r1
+ * 44c: mov r14, r2
+ * 450: mov r6, #0 ; 0x0
+ * 454: b 0x4a0
+ * 458: add r3, r6, r10
+ * 45c: ldrb r3, [r3]
+ * 460: lsl r3, r3, #24
+ * 464: eor r11, r11, r3
+ * 468: mov r5, #8 ; 0x8
+ * 46c: and r3, r11, #-2147483648 ; 0x80000000
+ * 470: cmp r3, #0 ; 0x0
+ * 474: beq 0x48c
+ * 478: lsl r3, r11, #1
+ * 47c: ldr r12, [pc, #64] ; 0x4c4
+ * 480: eor r0, r3, r12
+ * 484: mov r11, r0
+ * 488: b 0x490
+ * 48c: lsl r11, r11, #1
+ * 490: sub r5, r5, #1 ; 0x1
+ * 494: cmp r5, #0 ; 0x0
+ * 498: bne 0x46c
+ * 49c: add r6, r6, #1 ; 0x1
+ * 4a0: cmp r6, r14
+ * 4a4: blt 0x458
+ * 4a8: mov r0, r11
+ * 4ac: pop {r4, r5, r6, r7, r8, r9, r10, r11, r15}
+ * 4c4: DATA: 0x04c11db7
+ */
+
+unsigned int rsb_crc(unsigned int r11, unsigned char *r10, unsigned int r14) {
+ unsigned int r6 = 0;
+ unsigned int r3;
+ int r5;
+
+ while (r6 < r14) {
+ r3 = (*(r6+r10)) << 24;
+ r11 = r11 ^ r3;
+
+ r5 = 8;
+
+ do {
+ r3 = r11 & 0x80000000;
+
+ if (r3 != 0) {
+ r3 = r11 << 1;
+ r11 = r3 ^ POLY;
+ } else {
+ r11 = r11 << 1;
+ }
+ r5--;
+ } while (r5);
+
+ r6++;
+ }
+
+ return r11;
+}