About File Version sha1 hash

Hi ,

Here's the difference between modified at and content modified at:

• content_modified_at: The last time the content was modified, which may predate when it was first uploaded to Box (if it was modified locally on another system).
• modified_at: The last time the content was modified since being uploaded into Box, not taking into account modifications before being uploaded to Box.

The SHA1 is auto-generated based on the content uploaded into Box, and may be used to compare against a SHA1 of the local file. 

- Jon

/* Cut-and-pasting relevant snippets from what I have. This is how I do it in C#. You may have to google how the SHA1Managed object does it. It returns the same sha1 string as the Box sha1. */

using SSC = System.Security.Cryptography;
using SI = System.IO;

public static string GetSha1HashOfFile(string pathToFile)
{
    using (SSC.SHA1Managed sha1 = new SSC.SHA1Managed())
    {
        using (SI.FileStream stream = SI.File.OpenRead(pathToFile))
        {
            return GetSha1Hash(sha1, stream);
        }
    }
}

public static string GetSha1Hash(SSC.SHA1Managed sha1, SI.Stream stream)
{
    byte[] hash = sha1.ComputeHash(stream);
    return HashByteArrayToString(hash);
}

public static string HashByteArrayToString(byte[] hashByteArray)
{
    System.Text.StringBuilder sb = new System.Text.StringBuilder(hashByteArray.Length * 2);
    foreach (byte b in hashByteArray)
    {
        // can be "x2" if you want lowercase
        sb.Append(b.ToString("X2"));
    }
    return sb.ToString();
}