Why Does My CircleCI Go Build Fail with \'agent key RSA SHA256: ... returned incorrect signature type\'?

"agent key RSA SHA256: ... returned incorrect signature type" Error: Analysis and Resolution

When attempting to execute automated builds for a Go project using CircleCI's default template, an enigmatic error surfaces: "agent key RSA SHA256: ... returned incorrect signature type." This error seemingly bears no relation to the project's code itself. Delving deeper, we will unveil the root cause of this cryptic message and equip you with a solution.

The genesis of this error lies in a discrepancy between the expected signature type and the one provided by the SSH agent. RSA SSH keys can employ different hash algorithms for signatures, including SHA-1, SHA-256, and SHA-512. Earlier implementations exclusively used SHA-1, leading to its implicit assumption for RSA keys. However, the advent of weaker SHA-1 prompted the introduction of stronger hash algorithms for enhanced security.

In this instance, the "incorrect signature type" error signifies that the SSH connection negotiated using an RSA key with a specific signature algorithm (either SHA-256 or SHA-512) while the SSH agent supplied an SHA-1 signature during the signature generation. This breach of the SSH agent protocol triggers the error message.

Worth noting, this error is not inherently detrimental to the build's progression, but it can potentially disrupt the connection if the remote endpoint declines to accept SHA-1 signatures.

Compounding this issue, you also encounter a separate error message originating from Git. This message stems from an attempt to execute a "git pull" command without having configured a remote for the targeted branch. In this particular scenario, the "go get" command, designed for dependency management, was inadvertently invoked on an existing repository, leading to this error.

To rectify these issues effectively, we recommend employing "go build" for dependency installation purposes. This command automatically fetches dependencies without the need for "go get." For more complex scenarios involving Git manipulation, leverage Git's innate capabilities, as "go get" lacks the sophistication to navigate such complexities.

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