Thanks for the reply. How do I transfer or copy the keyfile generated by RSA_keygen_ex()?
From: owner-openssl-us...@openssl.org [mailto:owner-openssl-us...@openssl.org] On Behalf Of pattabi raman Sent: Sunday, April 10, 2011 8:14 PM To: openssl-users@openssl.org Subject: Re: RSA key Hi, I am using the below code snippet and am able to do the encytption. But I need to convert the encrypted format to Binary format inorder to pass the encrypted key to a different system. Any one pls suggest how to do the same ??? Code snippet : void EncrCardPin(char *pin,char *encpin) { unsigned char* encrypted = (unsigned char *) malloc(256); int bufSize; char *pubname="publkey.pem"; FILE *keyfile = NULL; RSA* rsa= NULL; FILE *test = NULL; test=fopen( "test.txt","wb"); printf( "Opening the puclic key file: [%s]\n",pubname); keyfile = fopen(pubname, "r"); if (!keyfile) { printf( "error occured while reading public key file"); } printf( "Reading the public key block from: [%s] \n", pubname); rsa = PEM_read_RSA_PUBKEY(keyfile, NULL, NULL, NULL); if (rsa == NULL) { printf( "Badness has occured! Did not read public key file\n"); } else { printf( "Opened public key file OK!\n"); } printf( "Encrypting the message [%s] using public key \n",pin); bufSize = RSA_public_encrypt(strlen(pin), ( unsigned char *) pin, encrypted, rsa, RSA_PKCS1_PADDING); if (bufSize == -1) { printf( "Badness has occured! encryption failed\n"); RSA_free(rsa); } else { printf( "Encrypted the message OK! \n"); //memcpy(encrypted,encpin,1500); sprintf(encpin, "%s",encrypted); fprintf(test, "%s",encpin); printf( "The buffersize is : [%d]\n ================",bufSize); } RSA_free(rsa); fclose(keyfile); fclose(test); } On Thu, Mar 31, 2011 at 9:47 AM, Adrian D. Sacrez <adrian...@verifone.com<mailto:adrian...@verifone.com>> wrote: Hi, I need help on how to do RSA encryption using Openssl in C language. Is there a code snippet on how to do this? Also, how do I extract or get the key from RSA_generate_key_ex()? Is the key generated from this function a private/public key Thanks, Adrian
