87 lines
2.7 KiB
C#
87 lines
2.7 KiB
C#
using System;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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namespace BlueWest.Cryptography
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{
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public abstract class BaseCryptoItem
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{
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public enum HashAlgorithm
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{
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// ReSharper disable once InconsistentNaming
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SHA2_512 = 1,
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// ReSharper disable once InconsistentNaming
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PBKDF2_SHA512 = 2,
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// ReSharper disable once InconsistentNaming
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SHA3_512 = 3
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}
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protected byte[] HexStringToByteArray(string stringInHexFormat)
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{
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var converted = Enumerable.Range(0, stringInHexFormat.Length)
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.Where(x => x % 2 == 0)
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.Select(x => Convert.ToByte(stringInHexFormat.Substring(x, 2), 16))
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.ToArray();
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return converted;
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}
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protected string ByteArrayToString(byte[] bytes)
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{
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var sb = new StringBuilder();
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for (int i = 0; i < bytes.Length; i++)
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{
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sb.Append(bytes[i].ToString("X2"));
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}
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return sb.ToString();
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}
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/// <summary>
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/// Generates a random string
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/// </summary>
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/// <param name="length">The length of the random string</param>
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/// <returns></returns>
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protected string CreateRandomString(int length)
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{
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var rng = RandomNumberGenerator.Create();
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var buffer = new byte[length / 2];
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rng.GetBytes(buffer);
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var randomString = BitConverter.ToString(buffer).Replace("-", "");
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return randomString;
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}
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// TODO Refactor me
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/// <summary>
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/// Get Cryptographic algorithm
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/// </summary>
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/// <param name="cipherText"></param>
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/// <param name="algorithm"></param>
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/// <param name="keyIndex"></param>
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/// <param name="trimmedCipherText"></param>
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protected void GetAlgorithm(string cipherText, out int? algorithm, out int? keyIndex,
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out string trimmedCipherText)
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{
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algorithm = null;
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keyIndex = null;
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trimmedCipherText = cipherText;
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if (cipherText.Length <= 5 || cipherText[0] != '[') return;
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var cipherInfo = cipherText.Substring(1, cipherText.IndexOf(']') - 1).Split(",");
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if (int.TryParse(cipherInfo[0], out var foundAlgorithm))
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{
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algorithm = foundAlgorithm;
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}
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if (cipherInfo.Length == 2 && int.TryParse(cipherInfo[1], out var foundKeyIndex))
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keyIndex = foundKeyIndex;
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trimmedCipherText = cipherText.Substring(cipherText.IndexOf(']') + 1);
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}
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}
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} |