Convert byte array to PEM formatted string and set the heading as pem Header. - CSharp System

CSharp examples for System:Byte Array

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Description

Convert byte array to PEM formatted string and set the heading as pem Header.

Demo Code


using Microsoft.Win32;
using System.Text;
using System.IO;/*from   w  w  w. j a  v  a 2 s .co m*/
using System;

public class Main{
        /// <summary>
        /// Convert byte array to PEM formatted string and set the heading as pemHeader.
        /// </summary>
        /// <param name="data">source array.</param>
        /// <param name="pemHeader">PEM heading.</param>
        /// <returns>PEM formatted string.</returns>
        public static string BytesToPem(byte[] data, string pemHeader)
        {
            if (pemHeader == null || pemHeader.Length<1)
            {
                pemHeader = "ASN.1 Editor Generated PEM File";
            }
            string retval = "";
            if (pemHeader.Length > 0 && pemHeader[0] != ' ')
            {
                pemHeader = " " + pemHeader;
            }
            retval = Convert.ToBase64String(data);
            retval = FormatString(retval, 64, 0);
            retval = "-----BEGIN"+ pemHeader +"-----\r\n" +
                     retval +
                     "\r\n-----END"+ pemHeader +"-----\r\n";
            return retval;
        }
        /// <summary>
        /// Convert byte array to PEM formatted string.
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string BytesToPem(byte[] data)
        {
            return BytesToPem(data, "");
        }
        /// <summary>
        /// Format a string to have certain line length and character group length.
        /// Sample result FormatString(xstr,32,2):
        /// <code>07 AE 0B E7 84 5A D4 6C 6A BD DF 8F 89 88 9E F1</code>
        /// </summary>
        /// <param name="inStr">source string.</param>
        /// <param name="lineLen">line length.</param>
        /// <param name="groupLen">group length.</param>
        /// <returns></returns>
        public static string FormatString(string inStr, int lineLen, int groupLen)
        {
            char[] tmpCh = new char[inStr.Length*2];
            int i, c = 0, linec = 0;
            int gc = 0;
            for (i=0; i<inStr.Length; i++)
            {
                tmpCh[c++] = inStr[i];
                gc++;
                linec++;
                if (gc >= groupLen && groupLen > 0)
                {
                    tmpCh[c++] = ' ';
                    gc = 0;
                }
                if (linec >= lineLen)
                {
                    tmpCh[c++] = '\r';
                    tmpCh[c++] = '\n';
                    linec = 0;
                }
            }
            string retval = new string(tmpCh);
            retval = retval.TrimEnd('\0');
            retval = retval.TrimEnd('\n');
            retval = retval.TrimEnd('\r');
            return retval;
        }
}

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