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(Mono C#) RSA Encrypt Hash using SHA256 hash function and SHA1 mask functionNote: This example requires a feature introduced in Chilkat v9.5.0.66 How can this Javascript be duplicated using Chilkat? function a(e, t) { var r = s.pki.publicKeyFromPem(e) , n = r.encrypt(t, "RSA-OAEP", { md: s.md.sha256.create(), mgf1: { md: s.md.sha1.create() } }); return s.util.encode64(n) } Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, even using the same data and key, the result will be different -- but still valid. One should not expect to get the same output.
// Note: This example requires a feature introduced in Chilkat v9.5.0.66 // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.PublicKey pubkey = new Chilkat.PublicKey(); Chilkat.StringBuilder sbPem = new Chilkat.StringBuilder(); bool bCrlf = true; sbPem.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf); sbPem.AppendLine("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",bCrlf); sbPem.AppendLine("3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",bCrlf); sbPem.AppendLine("04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",bCrlf); sbPem.AppendLine("Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",bCrlf); sbPem.AppendLine("wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",bCrlf); sbPem.AppendLine("f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",bCrlf); sbPem.AppendLine("SwIDAQAB",bCrlf); sbPem.AppendLine("-----END PUBLIC KEY-----",bCrlf); // Load the public key object from the PEM. bool success = pubkey.LoadFromString(sbPem.GetAsString()); if (success != true) { Debug.WriteLine(pubkey.LastErrorText); return; } string originalData = "This is the original data to be SHA-256 hashed and RSA encrypted."; // First we SHA-256 hash the original data to get the hash in base64 format: Chilkat.Crypt2 crypt = new Chilkat.Crypt2(); crypt.HashAlgorithm = "SHA-256"; crypt.EncodingMode = "base64"; string hashBase64 = crypt.HashStringENC(originalData); // Setup RSA to use OAEP padding with SHA-1 for the mask function. Chilkat.Rsa rsa = new Chilkat.Rsa(); rsa.OaepPadding = true; rsa.OaepHash = "SHA1"; rsa.ImportPublicKeyObj(pubkey); rsa.EncodingMode = "base64"; // Starting in v9.5.0.66, we can provide a binary encoding mode, such as "base64", "hex", "base64url", etc. // for the Charset property. The Charset property was previously limited to character encodings, such as // "utf-8", "iso-8859-1", etc. If a binary encoding is used, then the string passed in is decoded to the binary // bytes as indicated. (If an actual charset, such as "utf-8" is used, then the input string is converted to the // byte representation of the charset, and then encrypted.) // Given that a hash is composed of non-text binary bytes, we'll set the Charset property equal to "base64" // (because we have the base64 hash from above). rsa.Charset = "base64"; // Note: The OAEP padding uses random bytes in the padding, and therefore each time encryption happens, // even using the same data and key, the result will be different -- but still valid. One should not expect // to get the same output. bool bUsePrivateKey = false; string encryptedStr = rsa.EncryptStringENC(hashBase64,bUsePrivateKey); if (rsa.LastMethodSuccess != true) { Debug.WriteLine(rsa.LastErrorText); return; } Debug.WriteLine("Base64 RSA encrypted output: " + encryptedStr); |
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