private Cipher constructCipher()

in src/main/java/org/apache/xml/security/encryption/XMLCipher.java [1672:1731]
59 lines of code
18 McCabe index (conditional complexity)

    private Cipher constructCipher(String algorithm, String digestAlgorithm, Exception nsae) throws XMLEncryptionException {
        if (!XMLCipher.RSA_OAEP.equals(algorithm)) {
            throw new XMLEncryptionException(nsae);
        }

        if (digestAlgorithm == null
            || MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA1.equals(digestAlgorithm)) {
            try {
                if (requestedJCEProvider == null) {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding");
                } else {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding", requestedJCEProvider);
                }
            } catch (Exception ex) {
                throw new XMLEncryptionException(ex);
            }
        } else if (MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA224.equals(digestAlgorithm)) {
            try {
                if (requestedJCEProvider == null) {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-224andMGF1Padding");
                } else {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-224andMGF1Padding", requestedJCEProvider);
                }
            } catch (Exception ex) {
                throw new XMLEncryptionException(ex);
            }
        } else if (MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA256.equals(digestAlgorithm)) {
            try {
                if (requestedJCEProvider == null) {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding");
                } else {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-256AndMGF1Padding", requestedJCEProvider);
                }
            } catch (Exception ex) {
                throw new XMLEncryptionException(ex);
            }
        } else if (MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA384.equals(digestAlgorithm)) {
            try {
                if (requestedJCEProvider == null) {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-384AndMGF1Padding");
                } else {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-384AndMGF1Padding", requestedJCEProvider);
                }
            } catch (Exception ex) {
                throw new XMLEncryptionException(ex);
            }
        } else if (MessageDigestAlgorithm.ALGO_ID_DIGEST_SHA512.equals(digestAlgorithm)) {
            try {
                if (requestedJCEProvider == null) {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-512AndMGF1Padding");
                } else {
                    return Cipher.getInstance("RSA/ECB/OAEPWithSHA-512AndMGF1Padding", requestedJCEProvider);
                }
            } catch (Exception ex) {
                throw new XMLEncryptionException(ex);
            }
        } else {
            throw new XMLEncryptionException(nsae);
        }
    }