Set the algorithm member on cipher_t when allocating AES crypto instance. Apply…

Set the algorithm member on cipher_t when allocating AES crypto instance.  Apply same fix to NULL cipher.

libs/srtp/crypto/cipher/aes_icm.c

@@ -118,6 +118,17 @@ aes_icm_alloc_ismacryp(cipher_t **c, int key_len, int forIsmacryp) {
 
   /* set pointers */
   *c = (cipher_t *)pointer;
+  switch (key_len) {
+  case 46:
+      (*c)->algorithm = AES_256_ICM;
+      break;
+  case 38:
+      (*c)->algorithm = AES_192_ICM;
+      break;
+  default:
+      (*c)->algorithm = AES_128_ICM;
+      break;
+  }
   (*c)->type = &aes_icm;
   (*c)->state = pointer + sizeof(cipher_t);
 

libs/srtp/crypto/cipher/null_cipher.c

@@ -68,6 +68,7 @@ null_cipher_alloc(cipher_t **c, int key_len) {
 
   /* set pointers */
   *c = (cipher_t *)pointer;
+  (*c)->algorithm = NULL_CIPHER;
   (*c)->type = &null_cipher;
   (*c)->state = pointer + sizeof(cipher_t);