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(C) Create PKCS7 (CMS) EnvelopedDataEncrypt some data to a recipient by creating a PKCS7 (CMS) EnvelopedData structure. The data will be encrypted using a symmetric content-encryption algorithm (e.g., AES), and the randomly generated symmetric key will be encrypted using the recipient’s RSA public key extracted from their X.509 certificate.
#include <C_CkCrypt2.h> #include <C_CkCert.h> void ChilkatSample(void) { HCkCrypt2 crypt; HCkCert cert; BOOL success; const char *toBeEncrypted; const char *result; crypt = CkCrypt2_Create(); // Specify the encryption to be used. // "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped-data) message. CkCrypt2_putCryptAlgorithm(crypt,"pki"); CkCrypt2_putPkcs7CryptAlg(crypt,"aes"); CkCrypt2_putKeyLength(crypt,256); CkCrypt2_putOaepHash(crypt,"sha256"); CkCrypt2_putOaepPadding(crypt,TRUE); cert = CkCert_Create(); // Use a certificate found in the Windows certificate store. success = CkCert_LoadByCommonName(cert,"My Certificate"); if (success != TRUE) { printf("%s\n",CkCert_lastErrorText(cert)); CkCrypt2_Dispose(crypt); CkCert_Dispose(cert); return; } // Tell the crypt object to use the certificate. CkCrypt2_SetEncryptCert(crypt,cert); toBeEncrypted = "This string is to be encrypted."; // Get the result in multi-line BASE64 MIME format. CkCrypt2_putEncodingMode(crypt,"base64_mime"); CkCrypt2_putCharset(crypt,"utf-8"); result = CkCrypt2_encryptStringENC(crypt,toBeEncrypted); if (success != TRUE) { printf("%s\n",CkCrypt2_lastErrorText(crypt)); CkCrypt2_Dispose(crypt); CkCert_Dispose(cert); return; } // ------------------------------------------------------------------------- // See the following example to decrypt what was created in this example // Decrypt PKCS7 (CMS) EnvelopedData // ------------------------------------------------------------------------- printf("%s\n",result); // Sample output: // MIICSgYJKoZIhvcNAQcDoIICOzCCAjcCAQAxggHiMIIB3gIBADCBljCBgTELMAkGA1UEBhMCSVQx // EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj // dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH // MwIQPCWvkSv8oQ7xRmEHJ6TzEDA8BgkqhkiG9w0BAQcwL6APMA0GCWCGSAFlAwQCAQUAoRwwGgYJ // KoZIhvcNAQEIMA0GCWCGSAFlAwQCAQUABIIBAKqHAPQNSsQoX7B2NH7QyEOWQRsSVs8oCHXmy8f4 // MVZD2er3bvYUCIomxpwbLEAl14qjUIMynahooYGgqip7+4FqL301G+BVjZVfEhHWj+VI1dAWnWuL // VHlvc/pbQNBWqV8rKVJsNIsuAZkdj4WSwLVKxYkYX43B8fh/g71XN2DTJu7Z/824v48KBmgpQBOT // 2q7IcDGxNPAFN2p6eavIVGn2LvhEbf/Fszyj+GR5tMcnQP1BOLJ3s3JzUBbvj8hcZrF1Vhl9HnTU // YQx8G/KdW1mR+Wlhl3BWoK0LYKRTbnTx2BXOs0CY1SXOAdhKr01ZYjA+xW4nGzY0lfXS9QZjh9gw // TAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBKgQQw0xTbfmnt0zjWHo5SaQIp4AgxTVY9E/Ncqy6t+RM // 8y4c3Av62/wB8IpPUEmtM2OeuZo= CkCrypt2_Dispose(crypt); CkCert_Dispose(cert); } |
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