func Decrypt()

in image/image.go [720:746]

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

func Decrypt(img Image, privEncKey sec.PrivEncKey) (Image, error) {
	dup := img.Clone()

	tlvs := dup.RemoveTlvsIf(func(tlv ImageTlv) bool {
		return ImageTlvTypeIsSecret(tlv.Header.Type)
	})
	if len(tlvs) != 1 {
		return dup, errors.Errorf(
			"failed to decrypt image: wrong count of \"secret\" TLVs; "+
				"have=%d want=1", len(tlvs))
	}

	cipherSecret := tlvs[0].Data
	plainSecret, err := privEncKey.Decrypt(cipherSecret)
	if err != nil {
		return img, err
	}

	body, err := sec.EncryptAES(dup.Body, plainSecret, nil)
	if err != nil {
		return img, err
	}

	dup.Body = body

	return dup, nil
}