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var doc = new jsPDF (); doc.text(20, 20, 'Hello world!'); doc.text(20, 30, 'This is client-side Javascript, pumping out a PDF .'); doc.addPage(); doc.text(20, 20, 'Do ... Figure 11-3. Demonstration interface for encrypting/decrypting data Here s a utility encryption method that takes a key, an initialization vector, and the text to encrypt: private string Encrypt(byte[] key, byte[] iv, string plaintext) { AesManaged aes = new AesManaged(); aes.Key = key; aes.IV = iv; using (MemoryStream stream = new MemoryStream()) { using (CryptoStream encrypt = new CryptoStream(stream, aes.CreateEncryptor(), CryptoStreamMode.Write)) { byte[] plaintextBytes = UTF8Encoding.UTF8.GetBytes(plaintext); encrypt.Write(plaintextBytes, 0, plaintextBytes.Length); encrypt.FlushFinalBlock(); encrypt.Close(); return Convert.ToBase64String(stream.ToArray()); } } } The other important aspect to using the AES algorithm is using an initialization vector, as shown in the preceding code in the second parameter. By default, AES uses a 128-bit block size (a block is a fixed length of data used by certain encryption algorithms such as AES), and the initialization vector is used to initialize the block. Since the default block size is 128 bits, the default size of the initialization vector must be 16 bytes (128 bits / 8 bits per byte = 16 bytes). The initialization vector for the encryption must be the same when decrypting data, so if you send encrypted data over the wire, the other side must somehow know which initialization vector to use. This can be something agreed upon by the encryptor and decryptor in the code jspdf jpg to pdf: Generate Multipage PDF using Single Canvas of HTML Document ... online pdf javascript editor ViewerJS Home
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Support modification ( editing ) of existing documents. Work in all ... There are other good open source JavaScript PDF libraries available. However, most of them ... design phase. Here s what an example initialization vector looks like along with invoking the Encrypt method: byte[] initializationVector = { 0x11, 0xAF, 0x0C, 0x07, 0x17, 0xFC, 0xAA, 0x89, 0x09, 0xAE, 0xDA, 0xEA, 0x83, 0x00, 0xC0, 0x90}; encryptedText.Text = Encrypt(deriveBytes(pwText.Text, saltText.Text, 10), initializationVector, plainText.Text); The Decrypt method is implemented similarly, but uses the decryption functionality of the AesManaged class: private string Decrypt(byte[] key, byte[] iv, string encryptedText) { AesManaged aes = new AesManaged(); byte[] encryptedBytes = Convert.FromBase64String(encryptedText); aes.Key = key; aes.IV = iv; using (MemoryStream stream = new MemoryStream()) { using (CryptoStream decrypt = new CryptoStream(stream, aes.CreateDecryptor(), CryptoStreamMode.Write)) { decrypt.Write(encryptedBytes, 0, encryptedBytes.Length); decrypt.Flush(); decrypt.Close(); byte[] decryptedBytes = stream.ToArray(); return UTF8Encoding.UTF8.GetString( decryptedBytes, 0, decryptedBytes.Length); } } } Figure 7-1. New Web Site dialog box 6. The new project will contain a file named Class1.cs. Rename this file to Alert.cs. 7. Right-click References in the project, and select Add Reference. 8. Select System.Runtime.Serialization, and click the OK button. 9. Open the file Alert.cs, and add Using System.Runtime.Serialization to the top of the file. ASP.NET 2.0 introduced a membership database that combines database tables with stored procedures to provide authentication and authorization capabilities. The process of authentication is similar to a guard at a gate, checking identification cards, before allowing access. The authentication process has a binary answer: either the user has access or she doesn t. Authorization, however, controls the nature of the access once a user is inside the gate. Ushers at a concert, for example, check concertgoers tickets to make sure they are permitted access to the concert. This is an example of authentication. Some concert attendees might have access to a VIP section or have a backstage pass. These are varying degrees of access, from a regular concert attendee who can sit and watch to someone who is allowed to go backstage and meet the performers. This is an example of authorization what access does someone have after they get past the gate that separates insiders from outsiders pdf xchange editor javascript console Introducing PDFNetJS: A Complete Browser-Side PDF Viewer and ...
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