Assert failure using RSA

[mangodan2003]

In rsa.dart line 430 (https://github.com/hoylen/ssh_key/blob/master/lib/src/keys/rsa.dart#L420) an 8 byte prefix is generated but then lower down blockOverflow is calculated and used to make the final result length a multiple of 16 without taking the prefix into account. This can result in an assertion failure as the result can be out by 8 bytes.

[hoylen]

Thank you for reporting that.

That has been fixed it in the 0.8.0-beta code from the "rsa-private" branch in GitHub.

ssh_key/lib/src/keys/rsa.dart

Line 454 in 6ce0f16

final blockOverflow = ((dummyPrefix.length + pvt.length) % _pvtBlockSize);

I hope to find some time to publish a new release in the coming months. Meanwhile, you can reference the Git branch in your pubspec.yaml file.

Implementation support for private keys is experimental, since the format is not documented anywhere I could find. Public keys are designed to be exchanged, and private keys are not: so every implementation stores them however they want and don't bother documenting the format.