start RE'ing trace

4 files changed, 115 insertions, 3 deletions

diff --git a/dl3.c b/dl3.c
index 0ba12bb..132fb2c 100644
--- a/dl3.c
+++ b/dl3.c
@@ -39,12 +39,16 @@ struct hdcp_session_info {
 	const uint8_t *ks;
 };
 static int VID = 0x17e9;
-static int PID = 0x4301;
+static int PID = 0x4300;
 
 /* make km all 0s for now */
 static unsigned char mykm[16] = { 0xcd, 0xef, 0x65, 0x33, 0x69, 0x23, 0xfa, 0x3e,
 				0x60, 0xee, 0xdd, 0x5c, 0xce, 0xfb, 0x39, 0x19 };
 
+static unsigned char myfakekm[16] = { 0x16, 0xC6, 0xE5, 0xF6, 0x1B, 0x65, 0x5C, 0xBC, 0x79, 0xC9, 0xC2, 0xCC, 0x03, 0x91, 0xC2, 0x36 };
+
+static unsigned char forgekm[16] = { 0x72, 0x9d, 0x7d, 0xd6, 0x6c, 0x2e, 0xa6, 0x55, 0xf3, 0xb4, 0x1f, 0x93, 0x1a, 0x5a, 0xd9, 0xeb };
+
 static const uint8_t Rtx[] = { 0x84, 0xd7, 0xcf, 0x64, 0x2d, 0x68, 0xff, 0xd5 };
 
 static const uint8_t lc_Rn[] = { 0xd7, 0xfa, 0xf6, 0x99, 0x14, 0xd2, 0x51, 0xe0 };
@@ -54,6 +58,18 @@ static const uint8_t riv[] = { 0xea, 0xc1, 0x6d, 0xd3, 0x07, 0xf0, 0x5c, 0x9b};
 /* session key */
 static unsigned char myks[16] = { 0xcf, 0xef, 0x65, 0x33, 0x69, 0x23, 0xfa, 0x3e,
 				  0x61, 0xee, 0xdd, 0x5c, 0xce, 0xfb, 0x39, 0x19};
+
+static unsigned char myks2[16] = { 0x55, 0xf9, 0x55, 0x87,
+				   0xaf, 0x69, 0x22, 0x9a,
+				   0x4f, 0x2a, 0xb2, 0x70,
+				   0xce, 0x3f, 0xec, 0xf4 };
+
+/* sent from host to USB */
+static const uint8_t edkey_ks[16] = { 0x60, 0x06, 0x77, 0xE4, 0x5F, 0xD1, 0xCF, 0x5A, 0x62, 0x2D, 0xFE, 0x25, 0xBC, 0xD2, 0x9F, 0x92 };
+static const uint8_t fake_rrx[8] = { 0xCC, 0x28, 0xA9, 0x8B, 0x61, 0x32, 0x44, 0x07 };
+
+static const uint8_t mypkt_enc_data[] = {0xCF, 0xD2, 0x64, 0x70, 0x10, 0x8E, 0x5F, 0xAC, 0xD8, 0xB2, 0xD6, 0xC2, 0x2C, 0x2F, 0xCA, 0xBE, 0x94, 0x92, 0x37, 0xA9, 0x8B, 0x21, 0xF3, 0xC6, 0x28, 0x29, 0xB1, 0x0C, 0xA8, 0x93, 0x8F, 0xDD, 0x3B, 0x53, 0xE3, 0xDA, 0xE3, 0xFA, 0xC3, 0x1C, 0xCF, 0xEC, 0xBE, 0x7C, 0x90, 0x49, 0xAD, 0x86};
+
 static int create_gcrypt_pubkey(struct hdcp_session_info *info,
 				const uint8_t *n,
 				const uint8_t *e,
@@ -123,6 +139,31 @@ static int create_gcrypt_km(gcry_sexp_t *km,
 #define NULL_BYTES \
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 
+static void calc_ks_ctr(struct hdcp_session_info *info, uint32_t streamctr,
+			uint64_t input_ctr,
+			uint8_t *buf)
+{
+	uint8_t tmp[100];
+	unsigned char input[] = {NULL_BYTES, NULL_BYTES};
+	uint8_t iv[16];
+	int outl;
+	int ret;
+	int i;
+	memset(iv, 0, 16);
+
+	memcpy(iv, riv, 8);
+
+	ret = EVP_EncryptInit_ex(&info->aes_ctx, EVP_aes_128_ctr(), NULL, info->ks, iv);
+	assert(ret == 1);
+
+	ret = EVP_EncryptUpdate(&info->aes_ctx, buf, &outl, input, sizeof(input));
+	assert(ret == 1);
+	assert(outl == sizeof(input));
+
+	ret = EVP_EncryptFinal_ex(&info->aes_ctx, tmp, &outl);
+	assert(ret == 1);
+	assert(outl == 0);
+}
 static void calc_kd_ctr(struct hdcp_session_info *info, uint8_t ctr,
 			uint8_t *buf)
 {
@@ -161,6 +202,33 @@ static void calculate_kd(struct hdcp_session_info *info)
 	calc_kd_ctr(info, 1, &buf[16]);
 }
 
+static void calculate_hacker_key(struct hdcp_session_info *info)
+{
+	uint8_t *buf = info->edkey_ks;
+	int i;
+
+	calc_kd_ctr(info, 2, buf);
+
+	/* we have dkey2 in buf now */
+	printf("dkey2:");
+	for (i = 0; i < 16; i++) {
+		printf("%02x", buf[i]);
+	}
+
+	for (i = 0; i < 8; i++) {
+		buf[8 + i] ^= fake_rrx[i];
+	}
+
+	for (i = 0; i < 16; i++) {
+		buf[i] ^= edkey_ks[i];
+	}
+
+	printf("posks:");
+	for (i = 0; i < 16; i++) {
+		printf("%02x", buf[i]);
+	}
+}
+
 static void calculate_edkey_ks(struct hdcp_session_info *info)
 {
 	uint8_t *buf = info->edkey_ks;
@@ -475,9 +543,22 @@ static int send_buffer(libusb_device_handle *handle, int endpoint_out, int endpo
 	EVP_CIPHER_CTX_init(&info.aes_ctx);
 
 	info.rtx = Rtx;
-	info.km = mykm;
-	info.ks = myks;
+	info.km = forgekm;
+	info.ks = myks2;
 
+	{
+		uint8_t mybuf[48];
+		int i;
+		memset(mybuf, 0, 48);
+		calc_ks_ctr(&info, 0, 0, mybuf);
+		for (i = 0; i < 16; i++) {
+			printf("%02x", mybuf[i] ^ mypkt_enc_data[0 + i]);
+		}
+		printf("\n");
+	}
+//	return;
+//	calculate_hacker_key(&info);
+//	return;
 	dl3_empty_packet(buf, &len);
 	r = write_to_usb(handle, endpoint_out, buf, len, &size);
 	if (r != 0)
@@ -597,7 +678,18 @@ static int send_buffer(libusb_device_handle *handle, int endpoint_out, int endpo
 	if (r != 0)
 		goto out;
 
+	dl3_packet_send_enc_data(buf, &len, mypkt_enc_data);
+	r = write_to_usb(handle, endpoint_out, buf, len, &size);
+	if (r != 0)
+		goto out;
 
+	do {
+		r = block_read_usb(handle, endpoint_in, buf, &size);
+		if (r < 0)
+			break;
+		decode_rx(&info, buf, size);
+		/* find L' */
+	} while (1);
 	r = 0;
  out:
 	EVP_CIPHER_CTX_cleanup(&info.aes_ctx);
diff --git a/dl3_hdcp.c b/dl3_hdcp.c
index 799432d..9a06712 100644
--- a/dl3_hdcp.c
+++ b/dl3_hdcp.c
@@ -209,3 +209,19 @@ void dl3_packet_hdcp_ske_send_eks(uint8_t *buf, int *len_p, const uint8_t *edkey
 
 	*len_p = total_len + 4;
 }
+
+void dl3_packet_send_enc_data(uint8_t *buf, int *len_p, const uint8_t *enc_data)
+{
+	int total_len = 0;
+
+	total_len = 48 + 12;
+
+	memset(buf, 0, ROUND_TO_4(total_len + 4));
+	fill_hdcp_header1(buf, total_len, MSG_TYPE_4);
+	fill_hdcp_header2(buf, MSG4_PKT6);
+
+	buf[10] = 0xa;
+
+	memcpy(&buf[16], enc_data, 48);
+	*len_p = total_len + 4;
+}
diff --git a/dl_pkts.h b/dl_pkts.h
index 8623689..080fa65 100644
--- a/dl_pkts.h
+++ b/dl_pkts.h
@@ -9,5 +9,6 @@ void dl3_packet_hdcp_ake_init(uint8_t *buf, int *len_p, const uint8_t *Rtx);
 void dl3_packet_hdcp_ake_no_stored_km(uint8_t *buf, int *len_p, const uint8_t *ekpubkm);
 void dl3_packet_hdcp_lc_init(uint8_t *buf, int *len_p, const uint8_t *Rn);
 void dl3_packet_hdcp_ske_send_eks(uint8_t *buf, int *len_p, const uint8_t *edkey_ks, const uint8_t *riv);
+void dl3_packet_send_enc_data(uint8_t *buf, int *len_p, const uint8_t *enc_data);
 #define ROUND_TO_4(x) ((((x) + 3) / 4) * 4)
 #endif
diff --git a/pkts.h b/pkts.h
index 483019a..63d8d17 100644
--- a/pkts.h
+++ b/pkts.h
@@ -106,5 +106,8 @@ static unsigned char dplinkcert[] =
 0x81, 0xf1, 0xc6, 0x18, 0xd0, 0xc4, 0x85, 0x3d, 
  0x2b, 0x2b };
 
+static unsigned char kpubkm[] = {
+0x6D, 0xD2, 0x81, 0x00, 0x9E, 0x63, 0xBC, 0x98, 0x7C, 0x94, 0x9F, 0x9B, 0x83, 0x3B, 0x25, 0xC6, 0xFD, 0x88, 0x70, 0x9F, 0x3A, 0xFD, 0x32, 0x0E, 0x83, 0xFB, 0xBB, 0xFC, 0xAA, 0xF9, 0x52, 0xE8, 0xCE, 0x62, 0x1D, 0x13, 0x8C, 0xAC, 0x4D, 0x06, 0x16, 0x47, 0x75, 0x69, 0x80, 0x56, 0x58, 0xE1, 0xA7, 0xC0, 0x95, 0x4B, 0x9D, 0xF4, 0x13, 0xC8, 0x52, 0x29, 0xA5, 0xCA, 0x69, 0xBD, 0xAC, 0x42, 0xBB, 0xC2, 0x7E, 0x05, 0x30, 0xCF, 0x04, 0xC9, 0x40, 0xA1, 0x5C, 0x65, 0xC4, 0xF4, 0x6A, 0xFC, 0x58, 0xA2, 0x29, 0xA6, 0x7D, 0x3C, 0xD0, 0x5C, 0xDC, 0x7D, 0x9B, 0xD4, 0xC9, 0xB6, 0x8A, 0x41, 0x74, 0xFB, 0x78, 0x81, 0x8C, 0x6E, 0xD4, 0xE4, 0x5E, 0x17, 0xE1, 0x41, 0x79, 0xBA, 0x0B, 0xEF, 0x55, 0x86, 0x95, 0x52, 0x4C, 0xED, 0x3C, 0xD3, 0x7C, 0x7E, 0x19, 0x6E, 0x78, 0xD6, 0x9B, 0xB7
+};
 
 #endif