protected final Map generateCryptoMetadata()

in oss-20190517/src/main/java/com/aliyun/sdk/service/oss20190517/encryption/internal/CryptoModuleBase.java [223:261]
20 lines of code
4 McCabe index (conditional complexity)

    protected final Map<String, String> generateCryptoMetadata(ContentCryptoMaterial contentCryptoMaterial, Map<String, Object> headers) {
        Map<String, String> metadata = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);

        //x-oss-meta-client-side-encryption-key
        byte[] encryptedCEK = contentCryptoMaterial.getEncryptedCEK();
        metadata.put(CryptoHeaders.CRYPTO_KEY, Base64Util.encodeToString(encryptedCEK));

        //x-oss-meta-client-side-encryption-start //iv
        // Put the iv into the object metadata
        byte[] encryptedIV = contentCryptoMaterial.getEncryptedIV();
        metadata.put(CryptoHeaders.CRYPTO_IV, Base64Util.encodeToString(encryptedIV));

        //x-oss-meta-client-side-encryption-cek-alg
        // Put the content encrypt key algorithm into the object metadata
        String contentCryptoAlgo = contentCryptoMaterial.getContentCryptoAlgorithm();
        metadata.put(CryptoHeaders.CRYPTO_CEK_ALG, contentCryptoAlgo);

        //x-oss-meta-client-side-encryption-wrap-alg
        // Put the key wrap algorithm into the object metadata
        String keyWrapAlgo = contentCryptoMaterial.getKeyWrapAlgorithm();
        metadata.put(CryptoHeaders.CRYPTO_WRAP_ALG, keyWrapAlgo);

        //x-oss-meta-client-side-encryption-matdesc,json format
        // Put the crypto description into the object metadata
        Map<String, String> materialDesc = contentCryptoMaterial.getMaterialsDescription();
        if (materialDesc != null && materialDesc.size() > 0) {
            String descStr = ParseUtil.toJSONString(materialDesc);
            metadata.put(CryptoHeaders.CRYPTO_MATDESC, descStr);
        }

        //x-oss-meta-client-side-encryption-magic-number-hmac

        //x-oss-meta-client-side-encryption-unencrypted-content-md5
        if (headers.containsKey("Content-MD5")) {
            metadata.put(CryptoHeaders.CRYPTO_UNENCRYPTION_CONTENT_MD5, (String) headers.get("Content-MD5"));
        }

        return metadata;
    }