openssl/trunk/demos/maurice/example1.c


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generated by cgit v1.2.3 (git 2.25.1) at 2025-05-31 01:10:38 +0000
 

s="w">		readlen = read(STDIN, buf, sizeof(buf));

		if (readlen <= 0)
		{
		   if (readlen < 0)
			perror("read");

		   break;
		}

		EVP_SealUpdate(&ectx, ebuf, &ebuflen, buf, readlen);

		write(STDOUT, ebuf, ebuflen);
	}

        EVP_SealFinal(&ectx, ebuf, &ebuflen);
        
	write(STDOUT, ebuf, ebuflen);

        EVP_PKEY_free(pubKey[0]);
	free(ekey[0]);
}

void main_decrypt(void)
{
	char buf[520];
	char ebuf[512];
	unsigned int buflen;
        EVP_CIPHER_CTX ectx;
        unsigned char iv[EVP_MAX_IV_LENGTH];
	unsigned char *encryptKey; 
	unsigned int ekeylen; 
	EVP_PKEY *privateKey;

	memset(iv, '\0', sizeof(iv));

	privateKey = ReadPrivateKey(PRIVFILE);
	if (!privateKey)
	{
		fprintf(stderr, "Error: can't load private key");
		exit(1);	
	}

     	read(STDIN, &ekeylen, sizeof(ekeylen));
	ekeylen = ntohl(ekeylen);

	if (ekeylen != EVP_PKEY_size(privateKey))
	{
        	EVP_PKEY_free(privateKey);
		fprintf(stderr, "keylength mismatch");
		exit(1);	
	}

	encryptKey = malloc(sizeof(char) * ekeylen);
	if (!encryptKey)
	{
        	EVP_PKEY_free(privateKey);
		perror("malloc");
		exit(1);
	}

	read(STDIN, encryptKey, ekeylen);
	read(STDIN, iv, sizeof(iv));
	EVP_OpenInit(&ectx,
		   EVP_des_ede3_cbc(), 
		   encryptKey,
		   ekeylen,
		   iv,
		   privateKey); 	

	while(1)
	{
		int readlen = read(STDIN, ebuf, sizeof(ebuf));

		if (readlen <= 0)
		{
			if (readlen < 0)
				perror("read");

			break;
		}

		EVP_OpenUpdate(&ectx, buf, &buflen, ebuf, readlen);
		write(STDOUT, buf, buflen);
	}

        EVP_OpenFinal(&ectx, buf, &buflen);

	write(STDOUT, buf, buflen);

        EVP_PKEY_free(privateKey);
	free(encryptKey);
}