//  size=80
message ClientHello {
    required BuildInfo build_info = 0xa; // idx=0 offset=c
    repeated Fingerprint fingerprints_supported = 0x14; // idx=ffff offset=10
    repeated Cryptosuite cryptosuites_supported = 0x1e; // idx=ffff offset=2c
    repeated Powscheme powschemes_supported = 0x28; // idx=ffff offset=48
    required LoginCryptoHelloUnion login_crypto_hello = 0x32; // idx=1 offset=64
    required bytes client_nonce = 0x3c; // idx=2 offset=68 size=f
    optional bytes padding = 0x46; // idx=3 offset=78
    optional FeatureSet feature_set = 0x50; // idx=4 offset=7c
}

//  size=38
message BuildInfo {
    required Product product = 0xa; // idx=0 offset=c
    repeated ProductFlags product_flags = 0x14; // idx=ffff offset=10
    required Platform platform = 0x1e; // idx=1 offset=2c
    required uint64 version = 0x28; // idx=2 offset=30 extra=246558
}

enum Product {
    PRODUCT_CLIENT = 0x0;
    PRODUCT_LIBSPOTIFY= 0x1;
    PRODUCT_MOBILE = 0x2;
    PRODUCT_PARTNER = 0x3;
    PRODUCT_LIBSPOTIFY_EMBEDDED = 0x5;
}

enum ProductFlags {
    PRODUCT_FLAG_NONE = 0x0;
    PRODUCT_FLAG_DEV_BUILD = 0x1;
}

enum Platform {
    PLATFORM_WIN32_X86 = 0x0;
    PLATFORM_OSX_X86 = 0x1;
    PLATFORM_LINUX_X86 = 0x2;
    PLATFORM_IPHONE_ARM = 0x3;
    PLATFORM_S60_ARM = 0x4;
    PLATFORM_OSX_PPC = 0x5;
    PLATFORM_ANDROID_ARM = 0x6;
    PLATFORM_WINDOWS_CE_ARM = 0x7;
    PLATFORM_LINUX_X86_64 = 0x8;
    PLATFORM_OSX_X86_64 = 0x9;
    PLATFORM_PALM_ARM = 0xa;
    PLATFORM_LINUX_SH = 0xb;
    PLATFORM_FREEBSD_X86 = 0xc;
    PLATFORM_FREEBSD_X86_64 = 0xd;
    PLATFORM_BLACKBERRY_ARM = 0xe;
    PLATFORM_SONOS = 0xf;
    PLATFORM_LINUX_MIPS = 0x10;
    PLATFORM_LINUX_ARM = 0x11;
    PLATFORM_LOGITECH_ARM = 0x12;
    PLATFORM_LINUX_BLACKFIN = 0x13;
    PLATFORM_WP7_ARM = 0x14;
    PLATFORM_ONKYO_ARM = 0x15;
    PLATFORM_QNXNTO_ARM = 0x16;
    PLATFORM_BCO_ARM = 0x17;
}

enum Fingerprint {
    FINGERPRINT_GRAIN = 0x0;
    FINGERPRINT_HMAC_RIPEMD = 0x1;
}

enum Cryptosuite {
    CRYPTO_SUITE_SHANNON = 0x0;
    CRYPTO_SUITE_RC4_SHA1_HMAC = 0x1;
}

enum Powscheme {
    POW_HASH_CASH = 0x0;
}

//  size=10
message LoginCryptoHelloUnion {
    optional LoginCryptoDiffieHellmanHello diffie_hellman = 0xa; // idx=0 offset=c
}

//  size=70
message LoginCryptoDiffieHellmanHello {
    required bytes gc = 0xa; // idx=0 offset=c size=5f
    required uint32 server_keys_known = 0x14; // idx=1 offset=6c
}

//  size=10
message FeatureSet {
    optional bool autoupdate2 = 0x1; // idx=0 offset=c
    optional bool current_location = 0x2; // idx=1 offset=d
}


//  size=18
message APResponseMessage {
    optional APChallenge challenge = 0xa; // idx=0 offset=c
    optional UpgradeRequiredMessage upgrade = 0x14; // idx=1 offset=10
    optional APLoginFailed login_failed = 0x1e; // idx=2 offset=14
}

//  size=30
message APChallenge {
    required LoginCryptoChallengeUnion login_crypto_challenge = 0xa; // idx=0 offset=c
    required FingerprintChallengeUnion fingerprint_challenge = 0x14; // idx=1 offset=10
    required PoWChallengeUnion pow_challenge = 0x1e; // idx=2 offset=14
    required CryptoChallengeUnion crypto_challenge = 0x28; // idx=3 offset=18
    required bytes server_nonce = 0x32; // idx=4 offset=1c size=f
    optional bytes padding = 0x3c; // idx=5 offset=2c
}

//  size=10
message LoginCryptoChallengeUnion {
    optional LoginCryptoDiffieHellmanChallenge diffie_hellman = 0xa; // idx=0 offset=c
}

//  size=170
message LoginCryptoDiffieHellmanChallenge {
    required bytes gs = 0xa; // idx=0 offset=c size=5f
    required int32 server_signature_key = 0x14; // idx=1 offset=6c type=int8
    required bytes gs_signature = 0x1e; // idx=2 offset=6d size=ff
}

//  size=14
message FingerprintChallengeUnion {
    optional FingerprintGrainChallenge grain = 0xa; // idx=0 offset=c
    optional FingerprintHmacRipemdChallenge hmac_ripemd = 0x14; // idx=1 offset=10
}

//  size=1c
message FingerprintGrainChallenge {
    required bytes kek = 0xa; // idx=0 offset=c size=f
}

//  size=20
message FingerprintHmacRipemdChallenge {
    required bytes challenge = 0xa; // idx=0 offset=c size=13
}

//  size=10
message PoWChallengeUnion {
    optional PoWHashCashChallenge hash_cash = 0xa; // idx=0 offset=c
}

//  size=24
message PoWHashCashChallenge {
    optional bytes prefix = 0xa; // idx=0 offset=c size=f
    optional int32 length = 0x14; // idx=1 offset=1c type=int8
    optional int32 target = 0x1e; // idx=2 offset=20
}

//  size=14
message CryptoChallengeUnion {
    optional CryptoShannonChallenge shannon = 0xa; // idx=0 offset=c
    optional CryptoRc4Sha1HmacChallenge rc4_sha1_hmac = 0x14; // idx=1 offset=10
}

//  size=8
message CryptoShannonChallenge {
}

//  size=8
message CryptoRc4Sha1HmacChallenge {
}

//  size=18
message UpgradeRequiredMessage {
    required bytes upgrade_signed_part = 0xa; // idx=0 offset=c
    required bytes signature = 0x14; // idx=1 offset=10
    optional string http_suffix = 0x1e; // idx=2 offset=14
}

//  size=1c
message APLoginFailed {
    required ErrorCode error_code = 0xa; // idx=0 offset=c
    optional int32 retry_delay = 0x14; // idx=1 offset=10
    optional int32 expiry = 0x1e; // idx=2 offset=14
    optional string error_description = 0x28; // idx=3 offset=18
}

enum ErrorCode {
    ProtocolError = 0x0;
    TryAnotherAP = 0x2;
    BadConnectionId = 0x5;
    TravelRestriction = 0x9;
    PremiumAccountRequired = 0xb;
    BadCredentials = 0xc;
    CouldNotValidateCredentials = 0xd;
    AccountExists = 0xe;
    ExtraVerificationRequired = 0xf;
    InvalidAppKey = 0x10;
    ApplicationBanned = 0x11;
}



//  size=18
message ClientResponsePlaintext {
    required LoginCryptoResponseUnion login_crypto_response = 0xa; // idx=0 offset=c
    required PoWResponseUnion pow_response = 0x14; // idx=1 offset=10
    required CryptoResponseUnion crypto_response = 0x1e; // idx=2 offset=14
}

//  size=10
message LoginCryptoResponseUnion {
    optional LoginCryptoDiffieHellmanResponse diffie_hellman = 0xa; // idx=0 offset=c
}

//  size=20
message LoginCryptoDiffieHellmanResponse {
    required bytes hmac = 0xa; // idx=0 offset=c size=13
}

//  size=10
message PoWResponseUnion {
    optional PoWHashCashResponse hash_cash = 0xa; // idx=0 offset=c
}

//  size=1c
message PoWHashCashResponse {
    required bytes hash_suffix = 0xa; // idx=0 offset=c size=f
}

//  size=14
message CryptoResponseUnion {
    optional CryptoShannonResponse shannon = 0xa; // idx=0 offset=c
    optional CryptoRc4Sha1HmacResponse rc4_sha1_hmac = 0x14; // idx=1 offset=10
}

//  size=10
message CryptoShannonResponse {
    optional int32 dummy = 0x1; // idx=0 offset=c type=uint8
}

//  size=10
message CryptoRc4Sha1HmacResponse {
    optional int32 dummy = 0x1; // idx=0 offset=c type=uint8
}