Method decryptData_CBC

src/com/autoDecoder/util/SM4Utils.java:113–148

(String cipherText)

    }

    public String decryptData_CBC(String cipherText) {
        try {
            byte[] encrypted = Util.hexToByte(cipherText);
            cipherText=Base64.encodeBase64String(encrypted);;
            //cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0) {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString) {
                keyBytes = Util.hexStringToBytes(secretKey);
                ivBytes = Util.hexStringToBytes(iv);
            } else {
                keyBytes = secretKey.getBytes();
                ivBytes = iv.getBytes();
            }

            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            //byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));
            byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Base64.decodeBase64(cipherText));
            /*String text = new String(decrypted, "UTF-8");
            return text.substring(0,text.length()-1);*/
            return new String(decrypted, "UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) throws IOException {
        String plainText = "I Love You Every Day";