vchav

#include "openssl/rsa.h"
#include "openssl/pem.h"
#include "openssl/err.h"
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>


#define PRIVATE_KEY             0
#define PRIVATE_KEY_DATA "-----BEGIN RSA PRIVATE KEY-----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\nxiqeNlgl+kEEwhWTC7Z/4zOv4rPMJfmKWiVjG1kll30=\n-----END RSA PRIVATE KEY-----"

#define PUBLIC_KEY              1
#define PUBLIC_KEY_DATA "-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC63DnkIOVCRGA6yZeAERke4rsq\n6WgmCyDncvew5VUfXO5DT3YYEMPm2fkLkApjGiUynyOsPlMBy7pKw1kr1os5hlHa\nAt6bRbb/7pr1fCBK7M5fY+olQ3onYKFU0VcFBgz2XyF7RJsIPkC7N+3s4do9gmZp\nAqbiByXxRswo/AbnVQIDAQAB\n-----END PUBLIC KEY-----"


#define PUBLIC_CERTIFICATE      2
#define PUBLIC_CERTIFICATE_DATA "-----BEGIN CERTIFICATE-----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\nLDE5ha8P/JkJ/fiZYtG2A8ZzpRdC5B16w2rrH5OSDQrIyi+3xA==\n-----END CERTIFICATE-----"

#define MAN_OAEP_PADDING        42

typedef struct {
  size_t        len;
  u_char        *data;
} ngx_str_t;

RSA     *get_RSA_from_str(char *str, int cert_type, char *passphrase)
{
  EVP_PKEY      *pub;
  BIO           *mbio;

  mbio = BIO_new_mem_buf((void *)str, strlen(str));
  if (cert_type == PUBLIC_CERTIFICATE) {
    X509 *x509 = PEM_read_bio_X509(mbio, NULL, NULL, NULL);
    if (x509 == NULL) {
      printf("Error reading x509 bio\n");
      ERR_print_errors_fp(stderr);
      return NULL;
    }
    pub = X509_get_pubkey(x509);
    X509_free(x509);
  }
  else if (cert_type == PRIVATE_KEY)
    pub = PEM_read_bio_PrivateKey(mbio, NULL, NULL, passphrase);
  else if (cert_type == PUBLIC_KEY)
    pub = PEM_read_bio_PUBKEY(mbio, NULL, NULL, passphrase);
  BIO_reset(mbio);
  BIO_free(mbio);
  if (pub == NULL) {
    printf("Error reading the %d key \n", cert_type);
    ERR_print_errors_fp (stderr);
    return NULL;
  }
  RSA *tmp = EVP_PKEY_get1_RSA(pub);
  EVP_PKEY_free(pub);
  return (tmp);
}

int
public_encrypt(RSA *pkey, unsigned char *data_source, int length,
               ngx_str_t *output)
{
  int size = RSA_size(pkey);
  int block_size = size - MAN_OAEP_PADDING;
  int blocks = length / block_size;
  int rest = length % block_size;
  int i;
  int el;

  output->data = malloc((blocks + ((rest == 0) ? 0 : 1)) * size + 1);
  if (output->data == NULL)
    return 0;
  for (i = 0, output->len = 0; i < blocks || (i == blocks && rest != 0); i++) {
    if (blocks == i)
      el = RSA_public_encrypt(rest, data_source + i * block_size,
                              output->data + i * size, pkey,
                              RSA_PKCS1_OAEP_PADDING);
    else
      el = RSA_public_encrypt(block_size, data_source + i * block_size,
                              output->data + i * size, pkey,
                              RSA_PKCS1_OAEP_PADDING);
    if (el < 1)
      return 0;
    output->len += el;
  }
  return 1;
}

int
private_decrypt(RSA *pkey, unsigned char *data_source, int length,
                ngx_str_t *output)
{
  int size = RSA_size(pkey);
  int block_size = size - MAN_OAEP_PADDING;
  int blocks = length / size;
  int i;
  int el;

  output->data = malloc(blocks * block_size + 1);
  if (output->data == NULL)
    return 0;

  memset(output->data, 0, blocks * block_size);
  for (i = 0, output->len = 0; i < blocks; i++) {
    el = RSA_private_decrypt(size, data_source + i * size, output->data +
                             output->len, pkey, RSA_PKCS1_OAEP_PADDING);
    if (el < 1)
      return 0;
    output->len += el;
  }
  return 1;
}

int     main()
{
/*   char               pubkey[] = PUBLIC_KEY_DATA; */
  char          pubcert[] = PUBLIC_CERTIFICATE_DATA;
  char          privkey[] = PRIVATE_KEY_DATA;
  ngx_str_t     out_priv;
  ngx_str_t     out_pub;
  ngx_str_t     data;

  RSA *pubk = get_RSA_from_str(pubcert, PUBLIC_CERTIFICATE, NULL);
/*   RSA *pubk = get_RSA_from_str(pubkey, PUBLIC_KEY, NULL); */
  RSA *subk = get_RSA_from_str(privkey, PRIVATE_KEY, NULL);
  if (pubk == NULL || subk == NULL) {
    printf("Error setting key from EVP_PKEY_set1_RSA function\n");
    exit(EXIT_FAILURE);
  }

  data.data = (u_char *)"La peur bloque la compr�hension intelligente de la vie.";
  data.len = strlen((char *)data.data);

  public_encrypt(pubk, data.data, data.len, &out_pub);
  private_decrypt(subk, out_pub.data, out_pub.len, &out_priv);
  printf("%s\n", out_priv.data);

  free(out_priv.data);
  free(out_pub.data);

  ERR_print_errors_fp(stdout);
  RSA_free(pubk);
  RSA_free(subk);

  return (EXIT_SUCCESS);
}