Golang compilation error: "undefined: crypto/sha256" How to solve it?

If you encounter an "undefined: crypto/sha256" error when compiling or running a program using Golang, it is because Golang needs to use the SHA256 encryption algorithm when compiling the program, but does not find the corresponding library. This problem can be solved in several ways.

The first method is to solve the problem by installing Golang's standard library. You can use the following command to manually install the standard library:

go get -u -v golang.org/x/crypto/sha256

After the installation is completed, the "undefined: crypto/sha256" error will not appear when you compile or run the program again.

The second method is to update the version of Golang. Sometimes, the encryption algorithm library cannot be detected because the Golang version is too low. If you are using an older version of Golang, you can resolve the issue by upgrading to a newer version.

The third method is to manually import the SHA256 encryption algorithm library. You can add the following import statement to the code:

import "crypto/sha256"

Manually importing the library can solve compilation or running problems, but it is not a best practice. It is recommended to use the first or second method.

To sum up, if an "undefined: crypto/sha256" error occurs when compiling or running a program using Golang, you can use standard library installation, update the Golang version, or manually import the library to solve the problem. .

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