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pem.c
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pem.c
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#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/err.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
int main() {
unsigned char ibuf[128], obuf[128];
int i, ifd, ofd, ilen, olen, sz_enc, sz_dec;
ilen = olen = 128;
FILE *prk;
prk = fopen("/home/sgupta/tmp/pr.key", "r");
if (prk == NULL) {
printf("life sucks!\n");
exit(1);
} else {
printf("life looks good!\n");
}
RSA *rsa, *rsa2;
rsa = RSA_new();
//rsa2 = RSA_new();
if ((rsa2 = PEM_read_RSAPrivateKey(prk, &rsa, NULL, NULL)) != NULL) {
printf("key size: %d\n", RSA_size(rsa));
}
if (RSA_check_key(rsa)) {
printf("life is sweet!\n");
}
if ((ifd = open("/home/sgupta/tmp/encc", O_RDONLY)) > 0) {
printf("opened encrypted file!\n");
memset(ibuf, 0, ilen);
if ((ilen = read(ifd, ibuf, ilen)) > 0) {
printf("%d bytes read from input file\n", ilen);
memset(obuf, 0, olen);
if ((sz_dec = RSA_private_decrypt(ilen, ibuf, obuf, rsa, RSA_PKCS1_PADDING)) > -1) {
printf("size of decrypted text: %d\n", sz_dec);
printf("decrypted text -> ");
for (i = 0; i < sz_dec; i++) {
printf("%x", obuf[i]);
if (i < sz_dec - 1) printf(":");
}
printf("\n");
}
}
}
/* if ((ifd = open("/home/sgupta/tmp/cc", O_RDONLY)) > 0) {
printf("opened text file!\n");
memset(ibuf, 0, ilen);
if ((ilen = read(ifd, ibuf, ilen)) > 0) {
printf("%d bytes read from input file\n", ilen);
memset(obuf, 0, olen);
if ((sz_enc = RSA_public_encrypt(ilen, ibuf, obuf, rsa, RSA_NO_PADDING)) > -1) {
printf("size of encrypted text: %d\n", sz_enc);
printf("encrypted text -> ");
for (i = 0; i < sz_enc; i++) {
printf("%02x", obuf[i]);
if (i < sz_enc - 1) printf(":");
}
printf("\n");
}
}
}*/
}