Nextcloud restore with encryption recovery tools

[3d0220fd0f9a5702d0f7]

Hello, my Nextcloud installation uses server-side encryption. I am currently trying to restore a file using the encryption recovery tools; here is the link to it: encryption-recovery-tools/server-side-encryption at master · nextcloud/encryption-recovery-tools · GitHub. I have the master key from the file and have recovered the encrypted file, storing everything in the following folder structure.

manuel.mura@RG-KT6QNWJ0W0 nextcloud % tree
.
├── OC_DEFAULT_MODULE
│   ├── master_432db5a7.privateKey
│   ├── master_432db5a7.publicKey
│   ├── pubShare_432db5a7.privateKey
│   └── pubShare_432db5a7.publicKey
└── c3-data
    ├── cache
    ├── files
    │   └── backup_test
    │       └── Digitec_Auftragsbestätigung_120012917.pdf
    ├── files_encryption
    │   └── keys
    │       └── backup_test
    │           └── Digitec_Auftragsbestätigung_120012917.pdf
    │               └── OC_DEFAULT_MODULE
    │                   └── master_432db5a7.shareKey
    └── uploads

I have defined the secret key and the file folder.

config("DATADIRECTORY", "nextcloud");
	config("SECRET",        "mysecret");

However, when I start the script, I get the following:

php recover.php target 
INFO: decrypting private keys...
WARNING: COULD NOT DECRYPT ANY PRIVATE KEY
INFO: preparing sources, this could take a while...
ERROR: /Users/name/test_aws/nextcloud/c3-data/files/backup_test/Digitec_Auftragsbestätigung_120012917.pdf FAILED
ERROR: AN ERROR OCCURED DURING THE DECRYPTION

I don’t understand why this is happening.

Can someone help me?

Best Regards