func parseSignatureKey()

in options.go [285:304]

• 18 lines of code
• 4 McCabe index (conditional complexity)

func parseSignatureKey(o *Options, msgs []string) []string {
	if o.SignatureKey == "" {
		return msgs
	}

	components := strings.Split(o.SignatureKey, ":")
	if len(components) != 2 {
		return append(msgs, "invalid signature hash:key spec: "+
			o.SignatureKey)
	}

	algorithm, secretKey := components[0], components[1]
	if hash, err := hmacauth.DigestNameToCryptoHash(algorithm); err != nil {
		return append(msgs, "unsupported signature hash algorithm: "+
			o.SignatureKey)
	} else {
		o.signatureData = &SignatureData{hash, secretKey}
	}
	return msgs
}