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-rw-r--r--demos/maurice/example3.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/demos/maurice/example3.c b/demos/maurice/example3.c
new file mode 100644
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+++ b/demos/maurice/example3.c
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+/* 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 <fcntl.h>
+#include <sys/stat.h>
+#include <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_CipherInit(&ectx, ALG, 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(&ectx, ebuf, &ebuflen);
+
+ write(STDOUT, ebuf, ebuflen);
+}
+
+