X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/0de8e3874d6524379550a50a4d9c29faf2d239ea..2285d9dd944007444ceb042663fc20f6b0ac0d05:/client/mifarehost.c?ds=inline

diff --git a/client/mifarehost.c b/client/mifarehost.c
index d3f4a4cd..dc3b988a 100644
--- a/client/mifarehost.c
+++ b/client/mifarehost.c
@@ -630,3 +630,29 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
 
 	return 0;
 }
+
+int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){
+	/*
+	uint32_t nt;      // tag challenge
+	uint32_t nr_enc;  // encrypted reader challenge
+	uint32_t ar_enc;  // encrypted reader response
+	uint32_t at_enc;  // encrypted tag response
+	*/
+
+	struct Crypto1State *pcs = NULL;
+	
+	ks2 = ar_enc ^ prng_successor(nt, 64);
+	ks3 = at_enc ^ prng_successor(nt, 96);
+	
+	PrintAndLog("Decrypting data with:");
+	PrintAndLog("      nt: %08x",nt);
+	PrintAndLog("  ar_enc: %08x",ar_enc);
+	PrintAndLog("  at_enc: %08x",at_enc);
+	PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );
+
+	pcs = lfsr_recovery64(ks2, ks3);
+	mf_crypto1_decrypt(pcs, data, len, FALSE);
+	PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );
+	crypto1_destroy(pcs);
+	return 0;
+}