first commit, SM2-DSA only

demos/maurice/example3.c

@@ -0,0 +1,87 @@
+/* NOCW */
+/*
+        Please read the README file for condition of use, before
+        using this software.
+
+        Maurice Gittens  <mgittens@gits.nl>   January 1997
+
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <openssl/evp.h>
+
+#define STDIN     	0
+#define STDOUT    	1
+#define BUFLEN	  	512 
+#define INIT_VECTOR 	"12345678"
+#define ENCRYPT		1
+#define DECRYPT         0
+#define ALG		EVP_des_ede3_cbc()
+
+static const char *usage = "Usage: example3 [-d] password\n";
+
+void do_cipher(char *,int);
+
+int main(int argc, char *argv[])
+{
+	if ((argc == 2))	
+	{
+		do_cipher(argv[1],ENCRYPT);
+	}	
+	else if ((argc == 3) && !strcmp(argv[1],"-d"))
+	{
+		do_cipher(argv[2],DECRYPT);
+	}
+	else
+	{
+		fprintf(stderr,"%s", usage);
+		exit(1);
+	}
+
+	return 0;		
+}
+
+void do_cipher(char *pw, int operation)
+{
+	char buf[BUFLEN];
+	char ebuf[BUFLEN + 8];
+	unsigned int ebuflen; /* rc; */
+        unsigned char iv[EVP_MAX_IV_LENGTH], key[EVP_MAX_KEY_LENGTH];
+	/* unsigned int ekeylen, net_ekeylen;  */
+	EVP_CIPHER_CTX ectx;
+        
+	memcpy(iv, INIT_VECTOR, sizeof(iv));
+
+	EVP_BytesToKey(ALG, EVP_md5(), "salu", pw, strlen(pw), 1, key, iv);
+
+	EVP_CIPHER_CTX_init(&ectx);
+	EVP_CipherInit_ex(&ectx, ALG, NULL, key, iv, operation);
+
+	while(1)
+	{
+		int readlen = read(STDIN, buf, sizeof(buf));
+	
+		if (readlen <= 0)
+		{
+			if (!readlen)
+			   break;
+			else
+			{
+				perror("read");
+				exit(1);
+			}
+		}
+
+		EVP_CipherUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
+
+		write(STDOUT, ebuf, ebuflen);
+	}
+
+        EVP_CipherFinal_ex(&ectx, ebuf, &ebuflen); 
+	EVP_CIPHER_CTX_cleanup(&ectx);
+
+	write(STDOUT, ebuf, ebuflen); 
+}