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(Unicode C) RSA Encrypt with SHA-256 hash function and SHA-1 mask functionHow 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.
#include <C_CkPublicKeyW.h> #include <C_CkStringBuilderW.h> #include <C_CkCrypt2W.h> #include <C_CkByteData.h> #include <C_CkRsaW.h> void ChilkatSample(void) { HCkPublicKeyW pubkey; HCkStringBuilderW sbPem; BOOL bCrlf; BOOL success; const wchar_t *originalData; HCkCrypt2W crypt; HCkByteData hashBytes; HCkRsaW rsa; BOOL bUsePrivateKey; const wchar_t *encryptedStr; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pubkey = CkPublicKeyW_Create(); sbPem = CkStringBuilderW_Create(); bCrlf = TRUE; CkStringBuilderW_AppendLine(sbPem,L"-----BEGIN PUBLIC KEY-----",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA33TqqLR3eeUmDtHS89qF",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7s",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"Jp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwF",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"wnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUE",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"f0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1W",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"SwIDAQAB",bCrlf); CkStringBuilderW_AppendLine(sbPem,L"-----END PUBLIC KEY-----",bCrlf); // Load the public key object from the PEM. success = CkPublicKeyW_LoadFromString(pubkey,CkStringBuilderW_getAsString(sbPem)); if (success != TRUE) { wprintf(L"%s\n",CkPublicKeyW_lastErrorText(pubkey)); CkPublicKeyW_Dispose(pubkey); CkStringBuilderW_Dispose(sbPem); return; } originalData = L"This is the original data to be SHA-256 hashed and RSA encrypted."; // First we SHA-256 hash the original data. crypt = CkCrypt2W_Create(); CkCrypt2W_putHashAlgorithm(crypt,L"SHA-256"); hashBytes = CkByteData_Create(); success = CkCrypt2W_HashString(crypt,originalData,hashBytes); // Now to RSA encrypt using OAEP padding with SHA-1 for the mask function. rsa = CkRsaW_Create(); CkRsaW_putOaepPadding(rsa,TRUE); CkRsaW_putOaepHash(rsa,L"SHA1"); CkRsaW_ImportPublicKeyObj(rsa,pubkey); CkRsaW_putEncodingMode(rsa,L"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. bUsePrivateKey = FALSE; encryptedStr = CkRsaW_encryptBytesENC(rsa,hashBytes,bUsePrivateKey); if (CkRsaW_getLastMethodSuccess(rsa) != TRUE) { wprintf(L"%s\n",CkRsaW_lastErrorText(rsa)); CkPublicKeyW_Dispose(pubkey); CkStringBuilderW_Dispose(sbPem); CkCrypt2W_Dispose(crypt); CkByteData_Dispose(hashBytes); CkRsaW_Dispose(rsa); return; } wprintf(L"Base64 RSA encrypted output: %s\n",encryptedStr); CkPublicKeyW_Dispose(pubkey); CkStringBuilderW_Dispose(sbPem); CkCrypt2W_Dispose(crypt); CkByteData_Dispose(hashBytes); CkRsaW_Dispose(rsa); } |
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