LGDrmDexTemplate.bt

//--------------------------------------
//--- 010 Editor v6.0beta1 Binary Template
//
// File: LGDermDexTemplate.pt
// Author: Tim Strazzere <diff@lookout.com> <strazz@gmail.com>
// Revision: 0.1
// Purpose: Just parsing out some information while doing research
//          into LG's "almond" crypto drm.
//--------------------------------------


// TODO : Redo all this to just parse it out as a string and
// seperate it all using skip chars and \r\n seperators
typedef struct {
    ubyte encryption_method_key[Strlen("Encryption-Method")];
    if(Strcmp("Encryption-Method", encryption_method_key) != 0) {
        Printf("Unexpected encryption method key!\n");
    }
    FSkip(2); // Skip ": "

    ubyte encryption_method_value[Strlen("AES128CBC")];
    if(Strcmp("AES128CBC", encryption_method_value) != 0) {
        Printf("Unexpected encryption method value!\n");
    }
    FSkip(1); // Skip ";"

    ubyte padding_key[Strlen("padding=")];
    if(Strcmp("padding=", padding_key) != 0) {
        Printf("Unexpected padding key!\n");
    }

    ubyte padding_value[Strlen("RFC2630")];
    if(Strcmp("RFC2630", padding_value) != 0) {
        Printf("Unexpected padding value!\n");
    }
    FSkip(1); // Skip ";"

    ubyte plain_text_length_key[Strlen("plaintextlen=")];
    if(Strcmp("plaintextlen=", plain_text_length_key) != 0) {
        Printf("Unexpected plain text length key!\n");
    }

    ubyte plain_text_length_value[Strlen("0000378580")];
    FSkip(2); // Skip "; "

    ubyte preload_id_key[Strlen("LGEID")];
    if(Strcmp("LGEID", preload_id_key) != 0) {
        Printf("Unexpected preload id!\n");
    }
    FSkip(2); // Skip ": "

    ubyte preload_id_value[Strlen("VcYhp0fRX7OSDIKlV2z2u521UTM=")];
    FSkip(2); // Skip "; "
} encryption_block;

typedef struct {
    ubyte version <format=hex, comment="DRM version">;
    ubyte mime_type_length <format=hex, comment="Mime type length">;
    ubyte CID_length <format=hex, comment="CID length">;
    ubyte mime_type[mime_type_length] <format=hex, comment="Mime type">;
    if(Strcmp("application/octet-stream", mime_type) != 0) {
        Printf("Unexpected mime-type found!\n");
    }
    ubyte CID[CID_length]  <format=hex, comment="CID">;
    ubyte encryption_header_size; // length of encryption header block
    ubyte content_length;
    ubyte one2;
    ubyte one3;
    encryption_block encryption_data;
//    ubyte encryption_header[header_size];
} Header;

Header header;