Function Encrypt

crypt.go:163–189

Encrypt API encrypt data with the password.

(raw []byte, opts *Options)

// Encrypt API encrypt data with the password.
func Encrypt(raw []byte, opts *Options) ([]byte, error) {
	encryptor := encryption{
		EncryptedVerifierHashInput: make([]byte, 16),
		EncryptedVerifierHashValue: make([]byte, 32),
		SaltValue:                  make([]byte, 16),
		BlockSize:                  16,
		KeyBits:                    128,
		SaltSize:                   16,
	}
	// Key Encryption
	encryptionInfoBuffer, err := encryptor.standardKeyEncryption(opts.Password)
	if err != nil {
		return nil, err
	}
	// Package Encryption
	encryptedPackage := make([]byte, 8)
	binary.LittleEndian.PutUint64(encryptedPackage, uint64(len(raw)))
	encryptedPackage = append(encryptedPackage, encryptor.encrypt(raw)...)
	// Create a new CFB
	compoundFile := &cfb{
		paths:   []string{"Root Entry/"},
		sectors: []sector{{name: "Root Entry", typeID: 5}},
	}
	compoundFile.put("EncryptionInfo", encryptionInfoBuffer)
	compoundFile.put("EncryptedPackage", encryptedPackage)
	return compoundFile.write(), nil
}

// extractPart extract data from storage by specified part name.
func extractPart(doc *mscfb.Reader) ([]byte, []byte, error) {