Import code from previous AssetBuilder version

thirdparty/libtomcrypt/mac/pmac/pmac_init.c

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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+   @file pmac_init.c
+   PMAC implementation, initialize state, by Tom St Denis
+*/
+
+#ifdef LTC_PMAC
+
+static const struct {
+    int           len;
+    unsigned char poly_div[MAXBLOCKSIZE],
+                  poly_mul[MAXBLOCKSIZE];
+} polys[] = {
+{
+    8,
+    { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D },
+    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
+}, {
+    16,
+    { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 },
+    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
+}
+};
+
+/**
+   Initialize a PMAC state
+   @param pmac      The PMAC state to initialize
+   @param cipher    The index of the desired cipher
+   @param key       The secret key
+   @param keylen    The length of the secret key (octets)
+   @return CRYPT_OK if successful
+*/
+int pmac_init(pmac_state *pmac, int cipher, const unsigned char *key, unsigned long keylen)
+{
+   int poly, x, y, m, err;
+   unsigned char *L;
+
+   LTC_ARGCHK(pmac  != NULL);
+   LTC_ARGCHK(key   != NULL);
+
+   /* valid cipher? */
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* determine which polys to use */
+   pmac->block_len = cipher_descriptor[cipher].block_length;
+   for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) {
+       if (polys[poly].len == pmac->block_len) {
+          break;
+       }
+   }
+   if (poly >= (int)(sizeof(polys)/sizeof(polys[0]))) {
+      return CRYPT_INVALID_ARG;
+    }
+   if (polys[poly].len != pmac->block_len) {
+      return CRYPT_INVALID_ARG;
+   }
+
+#ifdef LTC_FAST
+   if (pmac->block_len % sizeof(LTC_FAST_TYPE)) {
+      return CRYPT_INVALID_ARG;
+   }
+#endif
+
+
+   /* schedule the key */
+   if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &pmac->key)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* allocate L */
+   L = XMALLOC(pmac->block_len);
+   if (L == NULL) {
+      return CRYPT_MEM;
+   }
+
+   /* find L = E[0] */
+   zeromem(L, pmac->block_len);
+   if ((err = cipher_descriptor[cipher].ecb_encrypt(L, L, &pmac->key)) != CRYPT_OK) {
+      goto error;
+   }
+
+   /* find Ls[i] = L << i for i == 0..31 */
+   XMEMCPY(pmac->Ls[0], L, pmac->block_len);
+   for (x = 1; x < 32; x++) {
+       m = pmac->Ls[x-1][0] >> 7;
+       for (y = 0; y < pmac->block_len-1; y++) {
+           pmac->Ls[x][y] = ((pmac->Ls[x-1][y] << 1) | (pmac->Ls[x-1][y+1] >> 7)) & 255;
+       }
+       pmac->Ls[x][pmac->block_len-1] = (pmac->Ls[x-1][pmac->block_len-1] << 1) & 255;
+
+       if (m == 1) {
+          for (y = 0; y < pmac->block_len; y++) {
+              pmac->Ls[x][y] ^= polys[poly].poly_mul[y];
+          }
+       }
+    }
+
+   /* find Lr = L / x */
+   m = L[pmac->block_len-1] & 1;
+
+   /* shift right */
+   for (x = pmac->block_len - 1; x > 0; x--) {
+      pmac->Lr[x] = ((L[x] >> 1) | (L[x-1] << 7)) & 255;
+   }
+   pmac->Lr[0] = L[0] >> 1;
+
+   if (m == 1) {
+      for (x = 0; x < pmac->block_len; x++) {
+         pmac->Lr[x] ^= polys[poly].poly_div[x];
+      }
+   }
+
+   /* zero buffer, counters, etc... */
+   pmac->block_index = 1;
+   pmac->cipher_idx  = cipher;
+   pmac->buflen      = 0;
+   zeromem(pmac->block,    sizeof(pmac->block));
+   zeromem(pmac->Li,       sizeof(pmac->Li));
+   zeromem(pmac->checksum, sizeof(pmac->checksum));
+   err = CRYPT_OK;
+error:
+#ifdef LTC_CLEAN_STACK
+   zeromem(L, pmac->block_len);
+#endif
+
+   XFREE(L);
+
+   return err;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */