How to Decrypt Encrypted PKCS8 Private Keys in Go and Fix the \"No DEK-Info header in block\" Error?

Decrypting Encrypted PKCS8 Private Keys: Resolving the "No DEK-Info header in block" Error

In an attempt to read an encrypted PKCS8 private key in Go, you may encounter the error "x509: no DEK-Info header in block." This error arises from an inherent limitation within the Go standard library, which lacks functionality for decrypting encrypted PKCS8 keys.

Troubleshooting the Issue

To ensure you're not generating the key incorrectly, verify that your OpenSSL commands are as follows:

1. Generate the private key:

   openssl genrsa -out file.pem -passout pass:file -aes256 1024

2. Convert to PKCS8 format:

   openssl pkcs8 -topk8 -inform pem -in file.pem -outform pem -out filePKCS8.pem

Alternative Solution

While the Go standard library does not provide direct support for decrypting encrypted PKCS8 keys, you can utilize an external package such as:

• github.com/youmark/pkcs8

This package offers a function specifically designed to decrypt encrypted PKCS8 keys:

func DecryptPrivateKey(block *pem.Block, password []byte) (priv interface{}, err error)

By using this package, you can overcome the limitations of the Go standard library and successfully decrypt encrypted PKCS8 private keys.

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