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Added Decrypt method which auto calculates the pad offset.

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This commit is contained in:
Greg Edwards
2014-05-16 19:49:22 -04:00
parent 7b51a4ab17
commit bc0e14beb2
1 changed files with 11 additions and 6 deletions
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17
bvCrawler4/Program.cs
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@@ -133,7 +133,7 @@ namespace bvCrawler4
request.Write(BitConverter.GetBytes(videoId), 0, 8);
request.Write(new byte[] { 0x40, 0x01, 0x00, 0x00 }, 0, 4);
request.Flush();
Encrypt(data, 6, 0xba);
Encrypt(data, 0xba);
PutLength(data);
byte[] response = Conversation(data);
@@ -161,7 +161,7 @@ namespace bvCrawler4
0x0c, 0x03, 0x00, 0x00
}, 0, 28);
request.Flush();
Encrypt(data, 6, 0xc9);
Encrypt(data, 0xc9);
PutLength(data);
byte[] response = Conversation(data);
@@ -171,8 +171,7 @@ namespace bvCrawler4
public static void QueueSearchResults(byte[] data)
{
if (data.Length % 240 != 12) throw new ArgumentException("Search results blob should be 12 bytes + 240 per result.");
int padOffset = (Array.IndexOf(PAD, data[6]) + 250) % 256; // todo: this search belongs in a Decrypt method.
Encrypt(data, 6, padOffset);
Decrypt(data);
AssertHelper.Assert(data[6] == 0x00);
AssertHelper.Assert(data[7] == 0x00); // saaaaanity
@@ -262,15 +261,21 @@ namespace bvCrawler4
return dataResponse;
}
public static void Encrypt(byte[] data, int startOffset, int padOffset)
public static void Encrypt(byte[] data, int padOffset)
{
// encrypt and decrypt are the same operation...
for (int x = startOffset; x < data.Length; x++)
for (int x = 6; x < data.Length; x++)
{
data[x] ^= PAD[(x + padOffset) % 256];
}
}
public static void Decrypt(byte[] data)
{
int padOffset = (Array.IndexOf(PAD, data[6]) + 250) % 256;
Encrypt(data, padOffset);
}
public static MySqlConnection CreateConnection()
{
return new MySqlConnection(ConfigurationManager.ConnectionStrings["pkmnFoundationsConnectionString"].ConnectionString);