How to Securely Store ECDSA Private Keys in Go?

Storing ECDSA Private Keys in Go

When generating ECDSA private/public key pairs using ecdsa.GenerateKey(), securely storing the private key is crucial for maintaining key integrity and data security. Go does not provide a direct method for marshaling private keys as it does for public keys with elliptic.Marshal().

Recommended Approach

The recommended approach for storing ECDSA private keys in Go is to utilize a multi-step encoding process involving the following components:

• Crypto Algorithm: ECDSA in this case.
• Standard Encoding: Typically X.509.
• File Format: Commonly, PEM.

Encoding and Decoding Example

The following code sample demonstrates the encoding and decoding of ECDSA keys in Go using the recommended approach:

func encode(privateKey *ecdsa.PrivateKey, publicKey *ecdsa.PublicKey) (string, string) {
    x509Encoded, _ := x509.MarshalECPrivateKey(privateKey)
    pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})

    x509EncodedPub, _ := x509.MarshalPKIXPublicKey(publicKey)
    pemEncodedPub := pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: x509EncodedPub})

    return string(pemEncoded), string(pemEncodedPub)
}

func decode(pemEncoded string, pemEncodedPub string) (*ecdsa.PrivateKey, *ecdsa.PublicKey) {
    block, _ := pem.Decode([]byte(pemEncoded))
    x509Encoded := block.Bytes
    privateKey, _ := x509.ParseECPrivateKey(x509Encoded)

    blockPub, _ := pem.Decode([]byte(pemEncodedPub))
    x509EncodedPub := blockPub.Bytes
    genericPublicKey, _ := x509.ParsePKIXPublicKey(x509EncodedPub)
    publicKey := genericPublicKey.(*ecdsa.PublicKey)

    return privateKey, publicKey
}

This approach ensures the secure storage and retrieval of ECDSA private keys by utilizing industry-standard encoding techniques and file formats.

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