Fixed common misspellings.

Mostly found by 'codespell'.

src/libstrongswan/plugins/des/des_crypter.c

@@ -80,7 +80,7 @@ struct private_des_crypter_t {
 	des_crypter_t public;
 
 	/**
-	 * Key size, depends on algoritm...
+	 * Key size, depends on algorithm...
 	 */
 	size_t key_size;
 
@@ -127,7 +127,7 @@ YOU SHOULD NOT HAVE BOTH DES_RISC1 AND DES_RISC2 DEFINED!!!!!
 #endif
 
 /* Unroll the inner loop, this sometimes helps, sometimes hinders.
- * Very mucy CPU dependant */
+ * Very much CPU dependent */
 #ifndef DES_UNROLL
 #define DES_UNROLL
 #endif
@@ -316,7 +316,7 @@ YOU SHOULD NOT HAVE BOTH DES_RISC1 AND DES_RISC2 DEFINED!!!!!
  * bytes, probably an issue of accessing non-word aligned objects :-( */
 #ifdef DES_PTR
 
-/* It recently occured to me that 0^0^0^0^0^0^0 == 0, so there
+/* It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there
  * is no reason to not xor all the sub items together.  This potentially
  * saves a register since things can be xored directly into L */