Scenari di test crittografici
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In questa pagina vengono descritti i test che un provider può scrivere per verificare la crittografia
componenti dell'implementazione
del provider.
Google consiglia di implementare questi test in anticipo per facilitare l'integrazione dell'accoppiamento rapido.
Scenari di test
Questi casi riguardano:
- Hashing
- Filtro Bloom
- Crittografia AES e scambio di chiavi pubbliche
- Crittografia e decifrazione dei messaggi
Hashing SHA-256
Valore di input:
0x11, 0x22, 0x33, 0x44, 0x55, 0x66
Risultato sottoposto ad hashing:
0xBB, 0x00, 0x0D, 0xDD, 0x92, 0xA0, 0xA2, 0xA3, 0x46, 0xF0, 0xB5, 0x31,
0xF2, 0x78, 0xAF, 0x06, 0xE3, 0x70, 0xF8, 0x69, 0x32, 0xCC, 0xAF, 0xCC,
0xC8, 0x92, 0xD6, 0x8D, 0x35, 0x0F, 0x80, 0xF8
Crittografia AES
Valore di input:
0xF3, 0x0F, 0x4E, 0x78, 0x6C, 0x59, 0xA7, 0xBB, 0xF3, 0x87, 0x3B, 0x5A,
0x49, 0xBA, 0x97, 0xEA
Chiave segreta:
0xA0, 0xBA, 0xF0, 0xBB, 0x95, 0x1F, 0xF7, 0xB6, 0xCF, 0x5E, 0x3F, 0x45,
0x61, 0xC3, 0x32, 0x1D
Output criptato:
0xAC, 0x9A, 0x16, 0xF0, 0x95, 0x3A, 0x3F, 0x22, 0x3D, 0xD1, 0x0C, 0xF5,
0x36, 0xE0, 0x9E, 0x9C
Scambio di chiavi ECDH
Chiave privata di Roberto:
0x02, 0xB4, 0x37, 0xB0, 0xED, 0xD6, 0xBB, 0xD4, 0x29, 0x06, 0x4A, 0x4E,
0x52, 0x9F, 0xCB, 0xF1, 0xC4, 0x8D, 0x0D, 0x62, 0x49, 0x24, 0xD5, 0x92,
0x27, 0x4B, 0x7E, 0xD8, 0x11, 0x93, 0xD7, 0x63
Chiave pubblica di Roberto:
0xF7, 0xD4, 0x96, 0xA6, 0x2E, 0xCA, 0x41, 0x63, 0x51, 0x54, 0x0A, 0xA3,
0x43, 0xBC, 0x69, 0x0A, 0x61, 0x09, 0xF5, 0x51, 0x50, 0x06, 0x66, 0xB8,
0x3B, 0x12, 0x51, 0xFB, 0x84, 0xFA, 0x28, 0x60, 0x79, 0x5E, 0xBD, 0x63,
0xD3, 0xB8, 0x83, 0x6F, 0x44, 0xA9, 0xA3, 0xE2, 0x8B, 0xB3, 0x40, 0x17,
0xE0, 0x15, 0xF5, 0x97, 0x93, 0x05, 0xD8, 0x49, 0xFD, 0xF8, 0xDE, 0x10,
0x12, 0x3B, 0x61, 0xD2
Chiave privata di Alice:
0xD7, 0x5E, 0x54, 0xC7, 0x7D, 0x76, 0x24, 0x89, 0xE5, 0x7C, 0xFA, 0x92,
0x37, 0x43, 0xF1, 0x67, 0x77, 0xA4, 0x28, 0x3D, 0x99, 0x80, 0x0B, 0xAC,
0x55, 0x58, 0x48, 0x38, 0x93, 0xE5, 0xB0, 0x6D
Chiave pubblica di Alice:
0x36, 0xAC, 0x68, 0x2C, 0x50, 0x82, 0x15, 0x66, 0x8F, 0xBE, 0xFE, 0x24,
0x7D, 0x01, 0xD5, 0xEB, 0x96, 0xE6, 0x31, 0x8E, 0x85, 0x5B, 0x2D, 0x64,
0xB5, 0x19, 0x5D, 0x38, 0xEE, 0x7E, 0x37, 0xBE, 0x18, 0x38, 0xC0, 0xB9,
0x48, 0xC3, 0xF7, 0x55, 0x20, 0xE0, 0x7E, 0x70, 0xF0, 0x72, 0x91, 0x41,
0x9A, 0xCE, 0x2D, 0x28, 0x14, 0x3C, 0x5A, 0xDB, 0x2D, 0xBD, 0x98, 0xEE,
0x3C, 0x8E, 0x4F, 0xBF
Chiave condivisa generata (pubblica di Alice + privata di Roberto o
pubblica + privata di Alice):
0x9D, 0xAD, 0xE4, 0xF8, 0x6A, 0xC3, 0x48, 0x8B, 0xBA, 0xC2, 0xAC, 0x34,
0xB5, 0xFE, 0x68, 0xA0, 0xEE, 0x5A, 0x67, 0x06, 0xF5, 0x43, 0xD9, 0x06,
0x1A, 0xD5, 0x78, 0x89, 0x49, 0x8A, 0xE6, 0xBA
Chiave AES dal secret condiviso ECDH
Questo è il passaggio 1b (generazione di chiavi AES) della procedura GATT.
Chiave condivisa ECDH:
0x9D, 0xAD, 0xE4, 0xF8, 0x6A, 0xC3, 0x48, 0x8B, 0xBA, 0xC2, 0xAC, 0x34,
0xB5, 0xFE, 0x68, 0xA0, 0xEE, 0x5A, 0x67, 0x06, 0xF5, 0x43, 0xD9, 0x06,
0x1A, 0xD5, 0x78, 0x89, 0x49, 0x8A, 0xE6, 0xBA
Chiave AES generata:
0xB0, 0x7F, 0x1F, 0x17, 0xC2, 0x36, 0xCB, 0xD3, 0x35, 0x23, 0xC5, 0x15,
0xF3, 0x50, 0xAE, 0x57
Filtro fioritura
Sale casuale:
0xC7C8
Prima chiave dell'account aggiunta al filtro (combinalo con il sale casuale sopra indicato):
0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0x00, 0xAA, 0xBB,
0xCC, 0xDD, 0xEE, 0xFF
Filtro Fioritura risultante:
0x02, 0x0C, 0x80, 0x2A
Dati sulla batteria (se contenuti nell'annuncio):
0b00110011, // length = 3, show UI indication.
0b01000000, // left bud: not charging, battery level = 64.
0b01000000, // right bud: not charging, battery level = 64.
0b01000000 // case: not charging, battery level = 64.
Filtro di fioritura finale con dati sulla batteria:
0x01, 0x01, 0x46, 0x0A
Seconda chiave dell'account aggiunta al filtro (combina con il sale casuale sopra indicato):
0x11, 0x11, 0x22, 0x22, 0x33, 0x33, 0x44, 0x44, 0x55, 0x55, 0x66, 0x66,
0x77, 0x77, 0x88, 0x88
Filtro Bloom risultante da entrambe le chiavi dell'account aggiunte:
0x84, 0x4A, 0x62, 0x20, 0x8B
Dati sulla batteria (se contenuti nell'annuncio):
0b00110011, // length = 3, show UI indication.
0b01000000, // left bud: not charging, battery level = 64.
0b01000000, // right bud: not charging, battery level = 64.
0b01000000 // case: not charging, battery level = 64.
Filtro di fioritura risultante da entrambe le chiavi dell'account aggiunte con dati sulla batteria:
0x46, 0x15, 0x24, 0xD0, 0x08
Crittografia AES-CTR
Dati di input: "Cuffie Google di un altro utente" con codifica utf-8
0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,
0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,
0x6E, 0x65
Chiave segreta:
0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF
Nonce:
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07
Risultato della crittografia previsto:
0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4, 0x4E, 0x9B, 0x2A, 0x14,
0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53, 0x6A, 0xF4, 0x38, 0xE1,
0xE5, 0xC6
HMAC-SHA256
Dati di input:
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83,
0x73, 0x80, 0x52, 0xE4, 0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA,
0x44, 0xB9, 0xE5, 0x53, 0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6
Chiave segreta:
0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF
Risultato HMAC-SHA256 previsto:
0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x61, 0x8B, 0x7D, 0x87,
0x10, 0xD4, 0x41, 0x37, 0x09, 0xAB, 0x5D, 0xA2, 0x7C, 0xA2, 0x6A, 0x66,
0xF5, 0x2E, 0x5A, 0xD4, 0xE8, 0x20, 0x90, 0x52
Codifica il nome personalizzato in un pacchetto di dati aggiuntivo
Dati di input: "Cuffie Google di un altro utente" con codifica utf-8
0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,
0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,
0x6E, 0x65
Chiave segreta:
0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF
Nonce:
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07
Pacchetto di dati aggiuntivo previsto:
0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4,
0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53,
0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6
Decodifica un pacchetto di dati aggiuntivo per ottenere un nome personalizzato
Dati di input:
0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4,
0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53,
0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6
Chiave segreta:
0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,
0x89, 0xAB, 0xCD, 0xEF
Nome previsto: "Cuffie Google di un altro utente" con codifica utf-8
0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,
0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,
0x6E, 0x65
Campo dello stato della connessione criptata
Lunghezza e tipo di campo:
0b001100101 (length = 3, type = connection status field)
Stato connessione:
0b10000101:
* on head detection = 1
* connection availability = 0
* focus mode = 0
* auto-reconnected = 0
* connection state = 0x5 (A2DP with AVRCP)
Dati personalizzati:
0x38
Bitmap dei dispositivi connessi:
0b00001001
Campo dello stato della connessione: dati non elaborati (combinazione superiore a 4 byte):
0x35853809
Chiave dell'account in uso (questa è la chiave):
0x04, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0x00, 0xAA, 0xBB,
0xCC, 0xDD, 0xEE, 0xFF
Chiave account non in uso:
0x04, 0x11, 0x22, 0x22, 0x33, 0x33, 0x44, 0x44, 0x55, 0x55, 0x66, 0x66,
0x77, 0x77, 0x88, 0x88
Sale casuale:
0xC7C8
Filtro chiave account (questo è IV): viene generato modificando il primo byte di
chiave account in uso da 0b00000100 a 0b00000110.
0x8C, 0xA9, 0x0C, 0x08, 0x1C
Campo dello stato della connessione criptata:
0xF4, 0xBB, 0x40, 0x6F
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-08-13 UTC.
[null,null,["Ultimo aggiornamento 2025-08-13 UTC."],[[["\u003cp\u003eThis page provides test cases for providers to validate the cryptographic aspects of their Fast Pair implementation, including hashing, Bloom filter generation, and encryption.\u003c/p\u003e\n"],["\u003cp\u003eGoogle advises incorporating these tests early in the development process for smoother Fast Pair integration.\u003c/p\u003e\n"],["\u003cp\u003eTest cases encompass SHA-256 hashing, Bloom filter construction with and without battery data, AES encryption and decryption, ECDH key exchange, and AES key derivation from ECDH shared secret.\u003c/p\u003e\n"],["\u003cp\u003eExamples and expected outputs are included for each test case, covering scenarios like personalized name encoding/decoding and connection status field encryption.\u003c/p\u003e\n"],["\u003cp\u003eSuccessful completion of these tests ensures the provider's implementation aligns with Fast Pair's security requirements.\u003c/p\u003e\n"]]],[],null,["# Cryptographic Test Cases\n\nThis page describes tests a provider can write to verify the cryptographic\ncomponents of their provider implementation.\n\nGoogle recommends implementing these tests early to ease Fast Pair integration.\n\nTest Cases\n----------\n\nThese cases cover:\n\n- Hashing\n- The Bloom Filter\n- AES Encryption and Public Key Exchange\n- Message enciphering and deciphering\n\n### SHA-256 Hashing\n\nInput value: \n\n 0x11, 0x22, 0x33, 0x44, 0x55, 0x66\n\nHashed result: \n\n 0xBB, 0x00, 0x0D, 0xDD, 0x92, 0xA0, 0xA2, 0xA3, 0x46, 0xF0, 0xB5, 0x31,\n 0xF2, 0x78, 0xAF, 0x06, 0xE3, 0x70, 0xF8, 0x69, 0x32, 0xCC, 0xAF, 0xCC,\n 0xC8, 0x92, 0xD6, 0x8D, 0x35, 0x0F, 0x80, 0xF8\n\n### AES Encryption\n\nInput value: \n\n 0xF3, 0x0F, 0x4E, 0x78, 0x6C, 0x59, 0xA7, 0xBB, 0xF3, 0x87, 0x3B, 0x5A,\n 0x49, 0xBA, 0x97, 0xEA\n\nSecret key: \n\n 0xA0, 0xBA, 0xF0, 0xBB, 0x95, 0x1F, 0xF7, 0xB6, 0xCF, 0x5E, 0x3F, 0x45,\n 0x61, 0xC3, 0x32, 0x1D\n\nEncrypted output: \n\n 0xAC, 0x9A, 0x16, 0xF0, 0x95, 0x3A, 0x3F, 0x22, 0x3D, 0xD1, 0x0C, 0xF5,\n 0x36, 0xE0, 0x9E, 0x9C\n\n### ECDH Key Exchange\n\nBob's private key: \n\n 0x02, 0xB4, 0x37, 0xB0, 0xED, 0xD6, 0xBB, 0xD4, 0x29, 0x06, 0x4A, 0x4E,\n 0x52, 0x9F, 0xCB, 0xF1, 0xC4, 0x8D, 0x0D, 0x62, 0x49, 0x24, 0xD5, 0x92,\n 0x27, 0x4B, 0x7E, 0xD8, 0x11, 0x93, 0xD7, 0x63\n\nBob's public key: \n\n 0xF7, 0xD4, 0x96, 0xA6, 0x2E, 0xCA, 0x41, 0x63, 0x51, 0x54, 0x0A, 0xA3,\n 0x43, 0xBC, 0x69, 0x0A, 0x61, 0x09, 0xF5, 0x51, 0x50, 0x06, 0x66, 0xB8,\n 0x3B, 0x12, 0x51, 0xFB, 0x84, 0xFA, 0x28, 0x60, 0x79, 0x5E, 0xBD, 0x63,\n 0xD3, 0xB8, 0x83, 0x6F, 0x44, 0xA9, 0xA3, 0xE2, 0x8B, 0xB3, 0x40, 0x17,\n 0xE0, 0x15, 0xF5, 0x97, 0x93, 0x05, 0xD8, 0x49, 0xFD, 0xF8, 0xDE, 0x10,\n 0x12, 0x3B, 0x61, 0xD2\n\nAlice's private key: \n\n 0xD7, 0x5E, 0x54, 0xC7, 0x7D, 0x76, 0x24, 0x89, 0xE5, 0x7C, 0xFA, 0x92,\n 0x37, 0x43, 0xF1, 0x67, 0x77, 0xA4, 0x28, 0x3D, 0x99, 0x80, 0x0B, 0xAC,\n 0x55, 0x58, 0x48, 0x38, 0x93, 0xE5, 0xB0, 0x6D\n\nAlice's public key: \n\n 0x36, 0xAC, 0x68, 0x2C, 0x50, 0x82, 0x15, 0x66, 0x8F, 0xBE, 0xFE, 0x24,\n 0x7D, 0x01, 0xD5, 0xEB, 0x96, 0xE6, 0x31, 0x8E, 0x85, 0x5B, 0x2D, 0x64,\n 0xB5, 0x19, 0x5D, 0x38, 0xEE, 0x7E, 0x37, 0xBE, 0x18, 0x38, 0xC0, 0xB9,\n 0x48, 0xC3, 0xF7, 0x55, 0x20, 0xE0, 0x7E, 0x70, 0xF0, 0x72, 0x91, 0x41,\n 0x9A, 0xCE, 0x2D, 0x28, 0x14, 0x3C, 0x5A, 0xDB, 0x2D, 0xBD, 0x98, 0xEE,\n 0x3C, 0x8E, 0x4F, 0xBF\n\nGenerated shared key (either Alice's public + Bob's private or Bob's\npublic + Alice's private): \n\n 0x9D, 0xAD, 0xE4, 0xF8, 0x6A, 0xC3, 0x48, 0x8B, 0xBA, 0xC2, 0xAC, 0x34,\n 0xB5, 0xFE, 0x68, 0xA0, 0xEE, 0x5A, 0x67, 0x06, 0xF5, 0x43, 0xD9, 0x06,\n 0x1A, 0xD5, 0x78, 0x89, 0x49, 0x8A, 0xE6, 0xBA\n\n### AES Key from ECDH Shared Secret\n\nThis is step 1b (AES key generation) in the GATT [procedure](/nearby/fast-pair/specifications/service/gatt#procedure \"Procedure\").\n\nECDH shared key: \n\n 0x9D, 0xAD, 0xE4, 0xF8, 0x6A, 0xC3, 0x48, 0x8B, 0xBA, 0xC2, 0xAC, 0x34,\n 0xB5, 0xFE, 0x68, 0xA0, 0xEE, 0x5A, 0x67, 0x06, 0xF5, 0x43, 0xD9, 0x06,\n 0x1A, 0xD5, 0x78, 0x89, 0x49, 0x8A, 0xE6, 0xBA\n\nGenerated AES key: \n\n 0xB0, 0x7F, 0x1F, 0x17, 0xC2, 0x36, 0xCB, 0xD3, 0x35, 0x23, 0xC5, 0x15,\n 0xF3, 0x50, 0xAE, 0x57\n\n### Bloom Filter\n\nRandom salt: \n\n 0xC7C8\n\nFirst account key added to the filter (combine with the above random salt): \n\n 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0x00, 0xAA, 0xBB,\n 0xCC, 0xDD, 0xEE, 0xFF\n\nResulting bloom filter: \n\n 0x02, 0x0C, 0x80, 0x2A\n\nBattery data (if it is contained in the advertisement): \n\n 0b00110011, // length = 3, show UI indication.\n 0b01000000, // left bud: not charging, battery level = 64.\n 0b01000000, // right bud: not charging, battery level = 64.\n 0b01000000 // case: not charging, battery level = 64.\n\nResulting bloom filter with battery data: \n\n 0x01, 0x01, 0x46, 0x0A\n\nSecond account key added to the filter (combine with the above random salt): \n\n 0x11, 0x11, 0x22, 0x22, 0x33, 0x33, 0x44, 0x44, 0x55, 0x55, 0x66, 0x66,\n 0x77, 0x77, 0x88, 0x88\n\nResulting bloom filter from both added account keys: \n\n 0x84, 0x4A, 0x62, 0x20, 0x8B\n\nBattery data (if it is contained in the advertisement): \n\n 0b00110011, // length = 3, show UI indication.\n 0b01000000, // left bud: not charging, battery level = 64.\n 0b01000000, // right bud: not charging, battery level = 64.\n 0b01000000 // case: not charging, battery level = 64.\n\nResulting bloom filter from both added account keys with battery data: \n\n 0x46, 0x15, 0x24, 0xD0, 0x08\n\n### AES-CTR Encryption\n\nInput data: \"Someone's Google Headphone\" with utf-8 encoding \n\n 0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,\n 0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,\n 0x6E, 0x65\n\nSecret key: \n\n 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,\n 0x89, 0xAB, 0xCD, 0xEF\n\nNonce: \n\n 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07\n\nExpected encryption result: \n\n 0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4, 0x4E, 0x9B, 0x2A, 0x14,\n 0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53, 0x6A, 0xF4, 0x38, 0xE1,\n 0xE5, 0xC6\n\n### HMAC-SHA256\n\nInput data: \n\n 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83,\n 0x73, 0x80, 0x52, 0xE4, 0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA,\n 0x44, 0xB9, 0xE5, 0x53, 0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6\n\nSecret key: \n\n 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,\n 0x89, 0xAB, 0xCD, 0xEF\n\nExpected HMAC-SHA256 result: \n\n 0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x61, 0x8B, 0x7D, 0x87,\n 0x10, 0xD4, 0x41, 0x37, 0x09, 0xAB, 0x5D, 0xA2, 0x7C, 0xA2, 0x6A, 0x66,\n 0xF5, 0x2E, 0x5A, 0xD4, 0xE8, 0x20, 0x90, 0x52\n\n### Encode personalized name to additional data packet\n\nInput data: \"Someone's Google Headphone\" with utf-8 encoding \n\n 0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,\n 0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,\n 0x6E, 0x65\n\nSecret key: \n\n 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,\n 0x89, 0xAB, 0xCD, 0xEF\n\nNonce: \n\n 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07\n\nExpected additional data packet: \n\n 0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x00, 0x01, 0x02, 0x03,\n 0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4,\n 0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53,\n 0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6\n\n### Decode additional data packet to get personalized name\n\nInput data: \n\n 0x55, 0xEC, 0x5E, 0x60, 0x55, 0xAF, 0x6E, 0x92, 0x00, 0x01, 0x02, 0x03,\n 0x04, 0x05, 0x06, 0x07, 0xEE, 0x4A, 0x24, 0x83, 0x73, 0x80, 0x52, 0xE4,\n 0x4E, 0x9B, 0x2A, 0x14, 0x5E, 0x5D, 0xDF, 0xAA, 0x44, 0xB9, 0xE5, 0x53,\n 0x6A, 0xF4, 0x38, 0xE1, 0xE5, 0xC6\n\nSecret key: \n\n 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0x01, 0x23, 0x45, 0x67,\n 0x89, 0xAB, 0xCD, 0xEF\n\nExpected name: \"Someone's Google Headphone\" with utf-8 encoding \n\n 0x53, 0x6F, 0x6D, 0x65, 0x6F, 0x6E, 0x65, 0x27, 0x73, 0x20, 0x47, 0x6F,\n 0x6F, 0x67, 0x6C, 0x65, 0x20, 0x48, 0x65, 0x61, 0x64, 0x70, 0x68, 0x6F,\n 0x6E, 0x65\n\n### Encrypted connection status field\n\nField length and type: \n\n 0b001100101 (length = 3, type = connection status field)\n\nConnection state: \n\n 0b10000101:\n\n * on head detection = 1\n * connection availability = 0\n * focus mode = 0\n * auto-reconnected = 0\n * connection state = 0x5 (A2DP with AVRCP)\n\nCustom data: \n\n 0x38\n\nConnected devices bitmap: \n\n 0b00001001\n\nConnection status field raw data (combine above 4 bytes): \n\n 0x35853809\n\nIn use account key (this is the Key): \n\n 0x04, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0x00, 0xAA, 0xBB,\n 0xCC, 0xDD, 0xEE, 0xFF\n\nNon-in use account key: \n\n 0x04, 0x11, 0x22, 0x22, 0x33, 0x33, 0x44, 0x44, 0x55, 0x55, 0x66, 0x66,\n 0x77, 0x77, 0x88, 0x88\n\nRandom salt: \n\n 0xC7C8\n\nAccount key filter (this is IV): this is generated by changing the first byte of\nin use account key from 0b00000100 to 0b00000110. \n\n 0x8C, 0xA9, 0x0C, 0x08, 0x1C\n\nEncrypted connection status field: \n\n 0xF4, 0xBB, 0x40, 0x6F\n\n| **Note:** this is encrypted by the original account key, in other words, the first byte of the key is 0x04 not 0x06"]]
