--- /dev/null
+/* Example code to illustrate DES enccryption/decryption using NSS.
+ * The example skips the details of obtaining the Key & IV to use, and
+ * just uses a hardcoded Key & IV.
+ * Note: IV is only needed if Cipher Blocking Chaining (CBC) mode of encryption
+ * is used
+ *
+ * The recommended approach is to store and transport WRAPPED (encrypted)
+ * DES Keys (IVs can be in the clear). However, it is a common (and dangerous)
+ * practice to use raw DES Keys. This example shows the use of a RAW key.
+ */
+
+
+#include <nss.h>
+#include <pk11pub.h>
+#include <prerror.h>
+#include <blapit.h>
+
+/* example Key & IV */
+unsigned char gKey[] = {0xe8, 0xa7, 0x7c, 0xe2, 0x05, 0x63, 0x6a, 0x31};
+unsigned char gIV[] = {0xe4, 0xbb, 0x3b, 0xd3, 0xc3, 0x71, 0x2e, 0x58};
+
+int main(int argc, char **argv)
+{
+ CK_MECHANISM_TYPE hashMech;
+ PK11SlotInfo* slot = NULL;
+ PK11SymKey* SymKey = NULL;
+ SECItem SecParam;
+ PK11Context* HashContext = NULL;
+ SECItem keyItem;
+ SECStatus rv, rv1, rv2;
+ unsigned char buf1[1024], buf2[1024];
+ char data[1024];
+ int i;
+ unsigned int tmp2_outlen;
+
+ /* Initialize NSS
+ * * If your application code has already initialized NSS, you can skip it
+ * * here.
+ * * This code uses the simplest of the Init functions, which does not
+ * * require a NSS database to exist
+ * */
+ rv = NSS_NoDB_Init(".");
+ if (rv != SECSuccess)
+ {
+ fprintf(stderr, "NSS initialization failed (err %d)\n",
+ PR_GetError());
+ goto out;
+ }
+
+ /* choose mechanism: CKM_DES_CBC_PAD, CKM_DES3_ECB, CKM_DES3_CBC.....
+ * * Note that some mechanisms (*_PAD) imply the padding is handled for you
+ * * by NSS. If you choose something else, then data padding is the
+ * * application's responsibility
+ * */
+ hashMech = CKM_SHA_1_HMAC;
+ slot = PK11_GetBestSlot(hashMech, NULL);
+ /* slot = PK11_GetInternalKeySlot(); is a simpler alternative but in
+ * * theory, it *may not* return the optimal slot for the operation. For
+ * * DES ops, Internal slot is typically the best slot
+ * */
+ if (slot == NULL)
+ {
+ fprintf(stderr, "Unable to find security device (err %d)\n",
+ PR_GetError());
+ goto out;
+ }
+
+ /* NSS passes blobs around as SECItems. These contain a pointer to
+ * * data and a length. Turn the raw key into a SECItem. */
+ keyItem.type = siBuffer;
+ keyItem.data = gKey;
+ keyItem.len = sizeof(gKey);
+
+ /* Turn the raw key into a key object. We use PK11_OriginUnwrap
+ * * to indicate the key was unwrapped - which is what should be done
+ * * normally anyway - using raw keys isn't a good idea */
+ SymKey = PK11_ImportSymKey(slot, hashMech, PK11_OriginUnwrap, CKA_SIGN,
+ &keyItem, NULL);
+ if (SymKey == NULL)
+ {
+ fprintf(stderr, "Failure to import key into NSS (err %d)\n",
+ PR_GetError());
+ goto out;
+ }
+
+ SecParam.type = siBuffer;
+ SecParam.data = 0;
+ SecParam.len = 0;
+
+ /* sample data we'll hash */
+ strcpy(data, "Hash me!");
+ fprintf(stderr, "Clear Data: %s\n", data);
+
+ /* ========================= START SECTION ============================= */
+ /* If using the the same key and iv over and over, stuff before this */
+ /* section and after this section needs to be done only ONCE */
+
+ /* Create cipher context */
+ HashContext = PK11_CreateContextBySymKey(hashMech, CKA_SIGN,
+ SymKey, &SecParam);
+
+ if (!HashContext) {
+ fprintf(stderr, "no hash context today?\n");
+ goto out;
+ }
+
+ if (PK11_DigestBegin(HashContext) != SECSuccess) {
+ fprintf(stderr, "hash doesn't begin?\n");
+ goto out;
+ }
+
+ rv1 = PK11_DigestOp(HashContext, (unsigned char *)data, strlen(data)+1);
+
+ rv2 = PK11_DigestFinal(HashContext, buf2, &tmp2_outlen, SHA1_BLOCK_LENGTH);
+
+ PK11_DestroyContext(HashContext, PR_TRUE);
+ if (rv1 != SECSuccess || rv2 != SECSuccess)
+ goto out;
+
+ fprintf(stderr, "Hash Data: ");
+ for (i=0; i<tmp2_outlen; i++)
+ fprintf(stderr, "%02x ", buf2[i]);
+ fprintf(stderr, "\n");
+
+ /* =========================== END SECTION ============================= */
+
+ /* ========================= START SECTION ============================= */
+ /* If using the the same key and iv over and over, stuff before this */
+ /* section and after this section needs to be done only ONCE */
+
+ memset(buf1, 0, sizeof(buf1));
+ memset(buf2, 0, sizeof(buf2));
+
+ /* Create cipher context */
+ HashContext = PK11_CreateContextBySymKey(hashMech, CKA_SIGN,
+ SymKey, &SecParam);
+
+ if (!HashContext) {
+ fprintf(stderr, "no hash context today?\n");
+ goto out;
+ }
+
+ if (PK11_DigestBegin(HashContext) != SECSuccess) {
+ fprintf(stderr, "hash doesn't begin?\n");
+ goto out;
+ }
+
+ rv1 = PK11_DigestOp(HashContext, (unsigned char *)data, 5);
+ rv1 = PK11_DigestOp(HashContext, (unsigned char *)data+5, 4);
+
+ rv2 = PK11_DigestFinal(HashContext, buf2, &tmp2_outlen, SHA1_BLOCK_LENGTH);
+
+ PK11_DestroyContext(HashContext, PR_TRUE);
+ if (rv1 != SECSuccess || rv2 != SECSuccess)
+ goto out;
+
+ fprintf(stderr, "Hash Data: ");
+ for (i=0; i<tmp2_outlen; i++)
+ fprintf(stderr, "%02x ", buf2[i]);
+ fprintf(stderr, "\n");
+
+ /* =========================== END SECTION ============================= */
+
+
+out:
+ if (SymKey)
+ PK11_FreeSymKey(SymKey);
+
+ return 0;
+
+}
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