Detached encrypt/decrypt example, fix decrypt sample.

[openssl.git] / demos / cms / cms_ddec.c

diff --git a/demos/cms/cms_ddec.c b/demos/cms/cms_ddec.c
new file mode 100644 (file)
index 0000000..ba68cfd
--- /dev/null
+++ b/demos/cms/cms_ddec.c
@@ -0,0 +1,89 @@
+/* S/MIME detached data decrypt example: rarely done but
+ * should the need arise this is an example....
+ */
+#include <openssl/pem.h>
+#include <openssl/cms.h>
+#include <openssl/err.h>
+
+int main(int argc, char **argv)
+       {
+       BIO *in = NULL, *out = NULL, *tbio = NULL, *dcont = NULL;
+       X509 *rcert = NULL;
+       EVP_PKEY *rkey = NULL;
+       CMS_ContentInfo *cms = NULL;
+       int ret = 1;
+
+       OpenSSL_add_all_algorithms();
+       ERR_load_crypto_strings();
+
+       /* Read in recipient certificate and private key */
+       tbio = BIO_new_file("signer.pem", "r");
+
+       if (!tbio)
+               goto err;
+
+       rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
+
+       BIO_reset(tbio);
+
+       rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
+
+       if (!rcert || !rkey)
+               goto err;
+
+       /* Open PEM file containing enveloped data */
+
+       in = BIO_new_file("smencr.pem", "r");
+
+       if (!in)
+               goto err;
+
+       /* Parse PEM content */
+       cms = PEM_read_bio_CMS(in, NULL, 0, NULL);
+
+       if (!cms)
+               goto err;
+
+       /* Open file containing detached content */
+       dcont = BIO_new_file("smencr.out", "rb");
+
+       if (!in)
+               goto err;
+
+       out = BIO_new_file("encrout.txt", "w");
+       if (!out)
+               goto err;
+
+       /* Decrypt S/MIME message */
+       if (!CMS_decrypt(cms, rkey, rcert, dcont, out, 0))
+               goto err;
+
+       ret = 0;
+
+       err:
+
+       if (ret)
+               {
+               fprintf(stderr, "Error Decrypting Data\n");
+               ERR_print_errors_fp(stderr);
+               }
+
+       if (cms)
+               CMS_ContentInfo_free(cms);
+       if (rcert)
+               X509_free(rcert);
+       if (rkey)
+               EVP_PKEY_free(rkey);
+
+       if (in)
+               BIO_free(in);
+       if (out)
+               BIO_free(out);
+       if (tbio)
+               BIO_free(tbio);
+       if (dcont)
+               BIO_free(dcont);
+
+       return ret;
+
+       }