first commit, SM2-DSA only

demos/maurice/example2.c

@@ -0,0 +1,75 @@
+/* NOCW */
+/*
+        Please read the README file for condition of use, before
+        using this software.
+
+        Maurice Gittens  <mgittens@gits.nl>   January 1997
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <strings.h>
+
+#include <openssl/rsa.h>
+#include <openssl/evp.h>
+#include <openssl/objects.h>
+#include <openssl/x509.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/ssl.h>
+
+#include "loadkeys.h"
+
+#define PUBFILE   "cert.pem"
+#define PRIVFILE  "privkey.pem"
+#define STDIN     0
+#define STDOUT    1 
+
+int main()
+{
+        char *ct = "This the clear text";
+	char *buf;   
+	char *buf2;
+  	EVP_PKEY *pubKey;
+  	EVP_PKEY *privKey;
+	int len;
+
+        ERR_load_crypto_strings();
+
+        privKey = ReadPrivateKey(PRIVFILE);
+        if (!privKey) 
+	{  
+		ERR_print_errors_fp (stderr);    
+		exit (1);  
+	}
+
+        pubKey = ReadPublicKey(PUBFILE);  
+	if(!pubKey)
+	{
+	   EVP_PKEY_free(privKey);   
+           fprintf(stderr,"Error: can't load public key");
+	   exit(1);
+	}
+
+	/* No error checking */
+        buf = malloc(EVP_PKEY_size(pubKey));
+        buf2 = malloc(EVP_PKEY_size(pubKey));
+
+	len = RSA_public_encrypt(strlen(ct)+1, ct, buf, pubKey->pkey.rsa,RSA_PKCS1_PADDING);
+
+	if (len != EVP_PKEY_size(pubKey))
+	{
+	    fprintf(stderr,"Error: ciphertext should match length of key\n");
+	    exit(1);
+	}
+
+	RSA_private_decrypt(len, buf, buf2, privKey->pkey.rsa,RSA_PKCS1_PADDING);
+
+	printf("%s\n", buf2);
+
+	EVP_PKEY_free(privKey);
+	EVP_PKEY_free(pubKey);
+	free(buf);
+	free(buf2);
+        return 0;
+}