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|website=https://gbatemp.net/threads/release-cro_tool-cro-resigner-for-rom-hacks-etc.395148 | |website=https://gbatemp.net/threads/release-cro_tool-cro-resigner-for-rom-hacks-etc.395148 | ||
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This tool is used to allow the modification of CRO libraries on 3DSes under FIRMs with PS:VerifyRsaSha256 patched in some form. On pirate CFWs, this is patched already. ARM11-based hacks which allow for romfs-file replacement won't work with this. | This tool is used to allow the modification of [http://3dbrew.org/wiki/CRO0 CRO libraries] on 3DSes under FIRMs with PS:VerifyRsaSha256 patched in some form. On pirate CFWs, this is patched already. ARM11-based hacks which allow for romfs-file replacement won't work with this. | ||
This is done by rebuilding hashes for each CRO file, then rehashing and resigning the CRR file based on those. A static RSA key is used for signing, since a hash of the latter half of the CRR must be signed even with VerifyRsaSha256 patched. | This is done by rebuilding hashes for each CRO file, then rehashing and resigning the CRR file based on those. A static RSA key is used for signing, since a hash of the latter half of the CRR must be signed even with VerifyRsaSha256 patched. | ||
Revision as of 03:22, 28 March 2022
| cro_tool | |
|---|---|
 | |
| General | |
| Author | WulfyStylez |
| Type | Hack Utilities |
| Version | 1.2 |
| License | Mixed |
| Last Updated | 2015/09/15 |
| Links | |
| Download | |
| Website | |
This tool is used to allow the modification of CRO libraries on 3DSes under FIRMs with PS:VerifyRsaSha256 patched in some form. On pirate CFWs, this is patched already. ARM11-based hacks which allow for romfs-file replacement won't work with this.
This is done by rebuilding hashes for each CRO file, then rehashing and resigning the CRR file based on those. A static RSA key is used for signing, since a hash of the latter half of the CRR must be signed even with VerifyRsaSha256 patched.
User guide
To use, put cro_tool in a folder with all CRO files from the target application.
Afterward, just use cro_tool [-v] static.crr or drag-n-drop static.crr onto cro_tool.
An invalid Nintendo signature is the intended behavior after resigning a crr with this tool.
Changelog
1.1
- Do hash verification how RO does it (just ensure the hash exists in the CRR hashtable, position-independent).
- Scan for cro files instead of user-specifying them.
Credits
Thanks to 3DSguy and neimod for ctrtool, which this tool was hastily built off of.