func replaceKey()

in imfg/imfg.go [230:252]

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

func replaceKey(mfgBin []byte, okey []byte, nkey []byte) (int, error) {
	if len(okey) > len(mfgBin) {
		return 0, errors.Errorf(
			"key longer than flash section (%d > %d)", len(okey), len(mfgBin))
	}

	idx := bytes.Index(mfgBin, okey)
	if idx == -1 {
		return 0, errors.Errorf("old key not present in flash section")
	}

	lastIdx := bytes.LastIndex(mfgBin, okey)
	if idx != lastIdx {
		return 0, errors.Errorf(
			"multiple instances of old key in flash section")
	}

	iutil.PrintfVerbose("Replacing key at offset %d\n", idx)

	copy(mfgBin[idx:idx+len(okey)], nkey)

	return idx, nil
}