Add TripleDES Encrypt/Decrypt

3des/3des.c

@@ -0,0 +1,59 @@
+#include <openssl/des.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+    DES_cblock cb1 = {0xFA, 0x5E, 0xAE, 0xBC, 0x19, 0x12, 0x13, 0xA1};
+    DES_cblock cb2 = {0xAF, 0xA4, 0xAE, 0xCB, 0xED, 0x45, 0x13, 0x1E};
+    DES_cblock cb3 = {0xB3, 0x24, 0xAE, 0xDE, 0xAD, 0x98, 0x31, 0x4E};
+
+    DES_key_schedule ks1, ks2, ks3;
+
+    DES_cblock cblock = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+    unsigned char *plainText = argv[1];
+    int plainTextLen = strlen(plainText);
+    printf("Plain Text : %s\n", plainText);
+
+    char *cipher[plainTextLen];
+    char *text[plainTextLen];
+    memset(cipher, 0, plainTextLen);
+    memset(text, 0, plainTextLen);
+
+    DES_set_odd_parity(&cblock);
+    DES_set_odd_parity(&cb1);
+    DES_set_odd_parity(&cb2);
+    DES_set_odd_parity(&cb3);
+
+    if (DES_set_key_checked(&cb1, &ks1) ||
+        DES_set_key_checked(&cb2, &ks2) ||
+        DES_set_key_checked(&cb3, &ks3))
+    {
+        printf("Key error, exiting ....\n");
+        return 1;
+    }
+
+    DES_ede3_cbc_encrypt((const unsigned char *)plainText,
+                         (unsigned char *)cipher,
+                         plainTextLen, &ks1, &ks2, &ks3,
+                         &cblock, DES_ENCRYPT);
+    printf("Encrypted : %32.32s\n", cipher);
+
+    //-----------------------------------------------
+    // You need to start with the same cblock value
+    memset(cblock, 0, sizeof(DES_cblock));
+    DES_set_odd_parity(&cblock);
+
+    //-----------------------------------------------
+    // I think you need to use 32 for the cipher len.
+    // You can't use strlen(cipher) because if there
+    // is a 0x00 in the middle of the cipher strlen
+    // will stop there and the length would be short
+    DES_ede3_cbc_encrypt((const unsigned char *)cipher,
+                         (unsigned char *)text,
+                         32, &ks1, &ks2, &ks3,
+                         &cblock, DES_DECRYPT);
+    printf("Decrypted : %s\n", text);
+}

Makefile

@@ -68,6 +68,11 @@ bin/shs: $(wildcard shs/*.c)
 	@echo "+ $@"
 	@$(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)
 
+all: bin/3des
+bin/3des:
+	@echo "+ $@"
+	@$(CC) 3des/3des.c -o $@ $(CFLAGS) $(LDFLAGS)
+
 all: bin/sym-key-gen
 bin/sym-key-gen:
 	@echo "+ $@"