implemented sha2_hasher which supports SHA-256, SHA-384 and SHA-512

src/libstrongswan/crypto/prfs/prf.h

@@ -31,7 +31,7 @@ typedef enum pseudo_random_function_t pseudo_random_function_t;
 /**
  * @brief Pseudo random function, as in IKEv2 RFC 3.3.2.
  * 
- * Currently only the following algorithms are implemented and therefore supported:
+ * Currently only the following algorithms are implemented:
  * - PRF_HMAC_MD5
  * - PRF_HMAC_SHA1
  * 
@@ -39,16 +39,12 @@ typedef enum pseudo_random_function_t pseudo_random_function_t;
  */
 enum pseudo_random_function_t {
 	PRF_UNDEFINED = 1024,
-	/**
-	 * Implemented in class hmac_prf_t.
-	 */
+	/** Implemented via hmac_prf_t. */
 	PRF_HMAC_MD5 = 1,
-	/**
-	 * Implemented in class hmac_prf_t.
-	 */
+	/** Implemented via hmac_prf_t. */
 	PRF_HMAC_SHA1 = 2,
 	PRF_HMAC_TIGER = 3,
-	PRF_AES128_CBC = 4
+	PRF_AES128_CBC = 4,
 };
 
 /** 
@@ -72,9 +68,8 @@ typedef struct prf_t prf_t;
  */
 struct prf_t {
 	/**
-	 * @brief Generates pseudo random bytes and writes them
-	 * in the buffer.
-	 * 
+	 * @brief Generates pseudo random bytes and writes them in the buffer.
+	 *
 	 * @param this			calling object
 	 * @param seed			a chunk containing the seed for the next bytes
 	 * @param[out] buffer	pointer where the generated bytes will be written