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@@ -19,12 +19,12 @@ namespace WechatBakTool.Helpers
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{
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public class DecryptionHelper
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{
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- const int IV_SIZE = 16;
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+ const long IV_SIZE = 16;
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const int HMAC_SHA1_SIZE = 20;
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const int KEY_SIZE = 32;
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const int AES_BLOCK_SIZE = 16;
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const int DEFAULT_ITER = 64000;
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- const int DEFAULT_PAGESIZE = 4096; //4048数据 + 16IV + 20 HMAC + 12
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+ const long DEFAULT_PAGESIZE = 4096; //4048数据 + 16IV + 20 HMAC + 12
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const string SQLITE_HEADER = "SQLite format 3";
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public static byte[]? GetWechatKey(string pid, int find_key_type, string account)
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{
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@@ -158,7 +158,7 @@ namespace WechatBakTool.Helpers
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hmac_salt[i] = (byte)(salt_key[i] ^ 0x3a);
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}
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//计算保留段长度
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- int reserved = IV_SIZE;
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+ long reserved = IV_SIZE;
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reserved += HMAC_SHA1_SIZE;
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reserved = ((reserved % AES_BLOCK_SIZE) == 0) ? reserved : ((reserved / AES_BLOCK_SIZE) + 1) * AES_BLOCK_SIZE;
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@@ -168,8 +168,8 @@ namespace WechatBakTool.Helpers
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OpenSSLInterop.PKCS5_PBKDF2_HMAC_SHA1(password_bytes, password_bytes.Length, salt_key, salt_key.Length, DEFAULT_ITER, key.Length, key);
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OpenSSLInterop.PKCS5_PBKDF2_HMAC_SHA1(key, key.Length, hmac_salt, hmac_salt.Length, 2, hmac_key.Length, hmac_key);
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- int page_no = 0;
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- int offset = 16;
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+ long page_no = 0;
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+ long offset = 16;
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Console.WriteLine("开始解密...");
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var hmac_sha1 = HMAC.Create("HMACSHA1");
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hmac_sha1!.Key = hmac_key;
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@@ -188,7 +188,7 @@ namespace WechatBakTool.Helpers
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byte[] decryped_page_bytes = new byte[DEFAULT_PAGESIZE];
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byte[] going_to_hashed = new byte[DEFAULT_PAGESIZE - reserved - offset + IV_SIZE + 4];
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fileStream.Seek((page_no * DEFAULT_PAGESIZE) + offset, SeekOrigin.Begin);
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- fileStream.Read(going_to_hashed, 0, DEFAULT_PAGESIZE - reserved - offset + IV_SIZE);
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+ fileStream.Read(going_to_hashed, 0, Convert.ToInt32(DEFAULT_PAGESIZE - reserved - offset + IV_SIZE));
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// 分页标志
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var page_bytes = BitConverter.GetBytes(page_no + 1);
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@@ -216,7 +216,7 @@ namespace WechatBakTool.Helpers
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// 加密内容
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byte[] page_content = new byte[DEFAULT_PAGESIZE - reserved - offset];
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fileStream.Seek((page_no * DEFAULT_PAGESIZE) + offset, SeekOrigin.Begin);
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- fileStream.Read(page_content, 0, DEFAULT_PAGESIZE - reserved - offset);
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+ fileStream.Read(page_content, 0, Convert.ToInt32(DEFAULT_PAGESIZE - reserved - offset));
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// iv
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byte[] iv = new byte[16];
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@@ -229,7 +229,7 @@ namespace WechatBakTool.Helpers
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// 保留
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byte[] reserved_byte = new byte[reserved];
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fileStream.Seek((page_no * DEFAULT_PAGESIZE) + DEFAULT_PAGESIZE - reserved, SeekOrigin.Begin);
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- fileStream.Read(reserved_byte, 0, reserved);
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+ fileStream.Read(reserved_byte, 0, Convert.ToInt32(reserved));
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reserved_byte.CopyTo(decryped_page_bytes, DEFAULT_PAGESIZE - reserved);
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tofileStream.Write(decryped_page_bytes, 0, decryped_page_bytes.Length);
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