1 files changed, 53 insertions, 0 deletions
diff --git a/demos/eay/loadrsa.c b/demos/eay/loadrsa.c
new file mode 100644
index 0000000000..91e62d74fe
--- /dev/null
+++ b/demos/eay/loadrsa.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include "rsa.h"
+
+/* This is a simple program to generate an RSA private key.  It then
+ * saves both the public and private key into a char array, then
+ * re-reads them.  It saves them as DER encoded binary data.
+ */
+
+void callback(stage,count,arg)
+int stage,count;
+char *arg;
+	{
+	FILE *out;
+
+	out=(FILE *)arg;
+	fprintf(out,"%d",stage);
+	if (stage == 3)
+		fprintf(out,"\n");
+	fflush(out);
+	}
+
+main()
+	{
+	RSA *rsa,*pub_rsa,*priv_rsa;
+	int len;
+	unsigned char buf[1024],*p;
+
+	rsa=RSA_generate_key(512,RSA_F4,callback,(char *)stdout);
+
+	p=buf;
+
+	/* Save the public key into buffer, we know it will be big enough
+	 * but we should really check how much space we need by calling the
+	 * i2d functions with a NULL second parameter */
+	len=i2d_RSAPublicKey(rsa,&p);
+	len+=i2d_RSAPrivateKey(rsa,&p);
+
+	printf("The public and private key are now both in a char array\n");
+	printf("and are taking up %d bytes\n",len);
+
+	RSA_free(rsa);
+
+	p=buf;
+	pub_rsa=d2i_RSAPublicKey(NULL,&p,(long)len);
+	len-=(p-buf);
+	priv_rsa=d2i_RSAPrivateKey(NULL,&p,(long)len);
+
+	if ((pub_rsa == NULL) || (priv_rsa == NULL))
+		ERR_print_errors_fp(stderr);
+
+	RSA_free(pub_rsa);
+	RSA_free(priv_rsa);
+	}