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e27dd4b6 DC |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
eee48b66 | 4 | ## Copyright (C) 2018 Dave Craig <dcraig@brightsign.biz> |
e27dd4b6 DC |
5 | ## |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either version 2 of the License, or | |
9 | ## (at your option) any later version. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | msg_ids = { | |
23 | 2: 'AKE_Init', | |
24 | 3: 'AKE_Send_Cert', | |
25 | 4: 'AKE_No_stored_km', | |
26 | 5: 'AKE_Stored_km', | |
27 | ||
28 | 7: 'AKE_Send_H_prime', | |
29 | 8: 'AKE_Send_Pairing_Info', | |
30 | ||
31 | 9: 'LC_Init', | |
32 | 10: 'LC_Send_L_prime', | |
33 | ||
34 | 11: 'SKE_Send_Eks', | |
35 | 12: 'RepeaterAuth_Send_ReceiverID_List', | |
36 | ||
37 | 15: 'RepeaterAuth_Send_Ack', | |
38 | 16: 'RepeaterAuth_Stream_Manage', | |
39 | 17: 'RepeaterAuth_Stream_Ready', | |
40 | } | |
41 | ||
4abd552b UH |
42 | write_items = { |
43 | 0x00: '1.4 Bksv - Receiver KSV', | |
44 | 0x08: '1.4 Ri\' - Link Verification', | |
45 | 0x0a: '1.4 Pj\' - Enhanced Link Verification', | |
46 | 0x10: '1.4 Aksv - Transmitter KSV', | |
47 | 0x15: '1.4 Ainfo - Transmitter KSV', | |
48 | 0x18: '1.4 An - Session random number', | |
49 | 0x20: '1.4 V\'H0', | |
50 | 0x24: '1.4 V\'H1', | |
51 | 0x28: '1.4 V\'H2', | |
52 | 0x2c: '1.4 V\'H3', | |
53 | 0x30: '1.4 V\'H4', | |
54 | 0x40: '1.4 Bcaps', | |
55 | 0x41: '1.4 Bstatus', | |
56 | 0x43: '1.4 KSV FIFO', | |
57 | 0x50: 'HDCP2Version', | |
58 | 0x60: 'Write_Message', | |
59 | 0x70: 'RxStatus', | |
60 | 0x80: 'Read_Message', | |
61 | } | |
62 | ||
e27dd4b6 DC |
63 | class Decoder(srd.Decoder): |
64 | api_version = 3 | |
65 | id = 'hdcp' | |
66 | name = 'HDCP' | |
67 | longname = 'HDCP over HDMI' | |
68 | desc = 'HDCP protocol over HDMI.' | |
69 | license = 'gplv2+' | |
70 | inputs = ['i2c'] | |
71 | outputs = ['hdcp'] | |
3e5bd72e | 72 | tags = ['PC', 'Security/crypto'] |
e27dd4b6 DC |
73 | annotations = \ |
74 | tuple(('message-0x%02X' % i, 'Message 0x%02X' % i) for i in range(18)) + ( | |
75 | ('summary', 'Summary'), | |
e144452b | 76 | ('warning', 'Warning'), |
e27dd4b6 DC |
77 | ) |
78 | annotation_rows = ( | |
79 | ('messages', 'Messages', tuple(range(18))), | |
e144452b | 80 | ('summaries', 'Summaries', (18,)), |
e27dd4b6 DC |
81 | ('warnings', 'Warnings', (19,)), |
82 | ) | |
83 | ||
84 | def __init__(self): | |
85 | self.reset() | |
86 | ||
87 | def reset(self): | |
88 | self.state = 'IDLE' | |
89 | self.stack = [] | |
90 | self.msg = -1 | |
91 | self.ss = self.es = self.ss_block = self.es_block = 0 | |
92 | self.init_seq = [] | |
93 | self.valid = 0 | |
94 | self.type = '' | |
95 | ||
96 | def start(self): | |
97 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
98 | ||
99 | def putb(self, data): | |
100 | self.put(self.ss_block, self.es_block, self.out_ann, data) | |
101 | ||
102 | def decode(self, ss, es, data): | |
103 | cmd, databyte = data | |
104 | ||
105 | # Collect the 'BITS' packet, then return. The next packet is | |
106 | # guaranteed to belong to these bits we just stored. | |
107 | if cmd == 'BITS': | |
108 | self.bits = databyte | |
109 | return | |
110 | ||
111 | self.ss, self.es = ss, es | |
112 | ||
113 | # State machine. | |
114 | if self.state == 'IDLE': | |
115 | # Wait for an I2C START condition. | |
116 | if cmd == 'START': | |
117 | self.reset() | |
118 | self.ss_block = ss | |
119 | elif cmd != 'START REPEAT': | |
120 | return | |
121 | self.state = 'GET SLAVE ADDR' | |
e27dd4b6 DC |
122 | elif self.state == 'GET SLAVE ADDR': |
123 | if cmd == 'ADDRESS READ': | |
124 | self.state = 'BUFFER DATA' | |
125 | if databyte != 0x3a: | |
126 | self.state = 'IDLE' | |
127 | elif cmd == 'ADDRESS WRITE': | |
128 | self.state = 'WRITE OFFSET' | |
129 | if databyte != 0x3a: | |
130 | self.state = 'IDLE' | |
e27dd4b6 DC |
131 | elif self.state == 'WRITE OFFSET': |
132 | if cmd == 'DATA WRITE': | |
4abd552b UH |
133 | if databyte in write_items: |
134 | self.type = write_items[databyte] | |
135 | if databyte in (0x10, 0x15, 0x18, 0x60): | |
e27dd4b6 | 136 | self.state = 'BUFFER DATA' |
e27dd4b6 DC |
137 | # If we are reading, then jump back to IDLE for a start repeat. |
138 | # If we are writing, then just continue onwards. | |
139 | if self.state == 'BUFFER DATA': | |
4abd552b | 140 | pass |
e27dd4b6 DC |
141 | elif self.type != '': |
142 | self.state = 'IDLE' | |
e27dd4b6 | 143 | elif self.state == 'BUFFER DATA': |
4abd552b | 144 | if cmd in ('STOP', 'NACK'): |
e27dd4b6 DC |
145 | self.es_block = es |
146 | self.state = 'IDLE' | |
9bbfff99 UH |
147 | if self.type == '': |
148 | return | |
149 | if not self.stack: | |
150 | self.putb([18, ['%s' % (self.type)]]) | |
151 | return | |
152 | if self.type == 'RxStatus': | |
153 | rxstatus = (self.stack.pop() << 8) | self.stack.pop() | |
154 | reauth_req = (rxstatus & 0x800) != 0 | |
155 | ready = (rxstatus & 0x400) != 0 | |
156 | length = rxstatus & 0x3ff | |
157 | text = '%s, reauth %s, ready %s, length %s' % \ | |
158 | (self.type, reauth_req, ready, length) | |
159 | self.putb([18, [text]]) | |
160 | elif self.type == '1.4 Bstatus': | |
161 | bstatus = (self.stack.pop() << 8) | self.stack.pop() | |
162 | device_count = bstatus & 0x7f | |
163 | max_devs_exceeded = (bstatus & 0x80) != 0 | |
164 | depth = ((bstatus & 0x700) >> 8) | |
165 | max_cascase_exceeded = bstatus & 0x800 | |
166 | hdmi_mode = (bstatus & 0x1000) != 0 | |
167 | text = '%s, %s devices, depth %s, hdmi mode %s' % \ | |
168 | (self.type, device_count, depth, hdmi_mode) | |
169 | self.putb([18, [text]]) | |
170 | elif self.type == 'Read_Message': | |
171 | msg = self.stack.pop(0) | |
172 | self.putb([msg, ['%s, %s' % (self.type, | |
173 | msg_ids.get(msg, 'Invalid'))]]) | |
174 | elif self.type == 'Write_Message': | |
175 | msg = self.stack.pop(0) | |
176 | self.putb([msg, ['%s, %s' % (self.type, | |
177 | msg_ids.get(msg, 'Invalid'))]]) | |
178 | elif self.type == 'HDCP2Version': | |
179 | version = self.stack.pop(0) | |
180 | if (version & 0x4): | |
181 | self.putb([18, ['HDCP2']]) | |
e27dd4b6 | 182 | else: |
9bbfff99 UH |
183 | self.putb([18, ['NOT HDCP2']]) |
184 | else: | |
185 | self.putb([18, ['%s' % (self.type)]]) | |
e27dd4b6 DC |
186 | elif cmd == 'DATA READ': |
187 | # Stack up our data bytes. | |
188 | self.stack.append(databyte) | |
189 | elif cmd == 'DATA WRITE': | |
190 | # Stack up our data bytes. | |
191 | self.stack.append(databyte) |