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Re: Using openssl functions on U++ [message #13114 is a reply to message #13113]

Wed, 12 December 2007 22:00

Zardos
Messages: 62
Registered: April 2007

Member

ealabarce wrote on Wed, 12 December 2007 21:11

Hello again, well im reading the documentation, and now i can get the md5 and the base64 convertion, but now I need to sign the md5 with a rsa .key private file, I trying to understand who to do this, viewing on the openssl.org API documentation, but I some confuse, let me explain:

First I initilize a RSA struture like this:
RSA *FirmaDigital;

Then i use the FileIn Stream:
FileIn StreamArchivoFirma;

Get a new Struct of RSA
FirmaDigital=RSA_new();

My cuestion is, who to put the file stream on the memory structure of RSA.

Thanks in advance.

I have attached a Upp package "CryptOpenSsl.zip".

There is a class with the following intefarce:

struct Rsa : public Moveable<Rsa> {
	Rsa() { rsa = NULL; }
	~Rsa() { if(rsa) RSA_free(rsa); }
	
	void GenerateKeyPair(int bits = 1024, int exponent = 17);

	String PrivateKeyToPem();
	String PublicKeyToPem();
	void PrivateKeyFromPem(const String &pem);
	void PrivateKeyFromPem(uint8 *d, int l);
	void PublicKeyFromPem(const String &pem);
	void PublicKeyFromPem(uint8 *d, int l);
		
	String SignSHA(const String &msg);
	String Decrypt(const String &msg, int padding = RSA_PKCS1_OAEP_PADDING);
	
	bool VerifySHA(const String &msg, const String &sig);
	String Encrypt(const String &msg, int padding = RSA_PKCS1_OAEP_PADDING);
		
	int MaxMsgCount(int padding = RSA_PKCS1_OAEP_PADDING);
	
	void Serialize(Stream &s);
	
protected:
	RSA *rsa;
};

a example:

#ifdef _DEBUG
TEST(Rsa) {
	Rsa rsa;
	rsa.GenerateKeyPair(512);
	
	String pri = rsa.PrivateKeyToPem();
	String pub = rsa.PublicKeyToPem();

	Rsa rsa2;
	rsa2.PrivateKeyFromPem(pri);

	String pri2 = rsa2.PrivateKeyToPem();
	String pub2 = rsa.PublicKeyToPem();	

	CHECK(pri == pri2);
	CHECK(pub == pub2);
	CHECK(rsa.VerifySHA("Kleiner Test", rsa2.SignSHA("Kleiner Test")));
	CHECK(rsa.Decrypt(rsa2.Encrypt("Kleiner Test")) == "Kleiner Test");
	CHECK(!rsa.VerifySHA("Kleiner Test", rsa2.SignSHA("@Kleiner Test")));
}
#endif

Use "SignSHA" and "VerifySHA" for signing and verification.
"Encrypt" and "Decrypt" for crypting.

The functions "PrivateKeyToPem" "PublicKeyToPem" "PrivateKeyFromPem" "PublicKeyFromPem" are useful, too. Use them to strore or load a public / private key.

Just look in the cpp file how it is done and copy what you need or tweak the class for your requirements.

- Ralf

Attachment: CryptOpenSsl.zip
(Size: 2.16KB, Downloaded 437 times)
Attachment: UnitTest.zip
(Size: 41.35KB, Downloaded 400 times)

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