1 files changed, 51 insertions, 0 deletions
diff --git a/misc.cc b/misc.cc
new file mode 100644
index 0000000..aafa372
--- /dev/null
+++ b/misc.cc
@@ -0,0 +1,51 @@
+#include <sstream>
+#include <string>
+#include "misc.h"
+#include "inttypes.h"
+
+namespace nitrokey {
+namespace misc {
+
+std::string hexdump(const char *p, size_t size) { 
+	std::stringstream out;
+	char formatbuf[128];
+	const char *pstart = p;
+
+	for (const char *pend = p + size; p < pend;) {
+		snprintf(formatbuf, 128, "%04x\t", p - pstart);
+		out << formatbuf;
+
+		for (const char *le = p + 16; p < le && p < pend; p++) {
+			snprintf(formatbuf, 128, "%02x ", uint8_t(*p));
+			out << formatbuf;
+		}
+		out << std::endl;
+	}
+	return out.str();
+}
+
+static uint32_t _crc32 (uint32_t crc, uint32_t data)
+{
+	int i;
+    crc = crc ^ data;
+
+    for (i = 0; i < 32; i++) {
+        if (crc & 0x80000000)
+            crc = (crc << 1) ^ 0x04C11DB7;  // polynomial used in STM32
+        else
+            crc = (crc << 1);
+	}
+
+    return crc;
+}
+
+uint32_t stm_crc32(const uint8_t *data, size_t size) {
+	uint32_t crc = 0xffffffff;
+	const uint32_t *pend = (const uint32_t *)(data + size);
+	for (const uint32_t *p = (const uint32_t *)(data); p < pend; p++)
+		crc = _crc32(crc, *p);
+	return crc;
+}
+
+}
+}