C#加密：SHA1

/// <summary>
/// 采用SHA-1算法加密字符串（小写）
/// </summary>
/// <param name="encypStr">需要加密的字符串</param>
/// <returns></returns>
public static string GetSha1(string encypStr)
{
	byte[] numArray = SHA1.Create().ComputeHash(Encoding.UTF8.GetBytes(encypStr));
	StringBuilder stringBuilder = new StringBuilder();
	byte[] numArray1 = numArray;
	for (int i = 0; i < (int)numArray1.Length; i++)
	{
		stringBuilder.AppendFormat("{0:x2}", numArray1[i]);
	}
	return stringBuilder.ToString();
}