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(Objective-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.
#import <CkoPublicKey.h> #import <CkoStringBuilder.h> #import <NSString.h> #import <CkoCrypt2.h> #import <CkoRsa.h> // 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. CkoPublicKey *pubkey = [[CkoPublicKey alloc] init]; CkoStringBuilder *sbPem = [[CkoStringBuilder alloc] init]; BOOL bCrlf = YES; [sbPem AppendLine: @"-----BEGIN PUBLIC KEY-----" crlf: bCrlf]; [sbPem AppendLine: @"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF" crlf: bCrlf]; [sbPem AppendLine: @"3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA" crlf: bCrlf]; [sbPem AppendLine: @"04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s" crlf: bCrlf]; [sbPem AppendLine: @"Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF" crlf: bCrlf]; [sbPem AppendLine: @"wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE" crlf: bCrlf]; [sbPem AppendLine: @"f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W" crlf: bCrlf]; [sbPem AppendLine: @"SwIDAQAB" crlf: bCrlf]; [sbPem AppendLine: @"-----END PUBLIC KEY-----" crlf: bCrlf]; // Load the public key object from the PEM. BOOL success = [pubkey LoadFromString: [sbPem GetAsString]]; if (success != YES) { NSLog(@"%@",pubkey.LastErrorText); return; } NSString *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: CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init]; crypt.HashAlgorithm = @"SHA-256"; crypt.EncodingMode = @"base64"; NSString *hashBase64 = [crypt HashStringENC: originalData]; // Setup RSA to use OAEP padding with SHA-1 for the mask function. CkoRsa *rsa = [[CkoRsa alloc] init]; rsa.OaepPadding = YES; 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 = NO; NSString *encryptedStr = [rsa EncryptStringENC: hashBase64 bUsePrivateKey: bUsePrivateKey]; if (rsa.LastMethodSuccess != YES) { NSLog(@"%@",rsa.LastErrorText); return; } NSLog(@"%@%@",@"Base64 RSA encrypted output: ",encryptedStr); |
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