Function to convert PRFs to hash algorithms added

src/libstrongswan/crypto/hashers/hasher.c

@@ -65,6 +65,36 @@ hash_algorithm_t hasher_algorithm_from_oid(int oid)
 	}
 }
 
+/*
+ * Described in header.
+ */
+hash_algorithm_t hasher_algorithm_from_prf(pseudo_random_function_t alg)
+{
+	switch (alg)
+	{
+		case PRF_HMAC_MD5:
+			return HASH_MD5;
+		case PRF_HMAC_SHA1:
+		case PRF_FIPS_SHA1_160:
+		case PRF_KEYED_SHA1:
+			return HASH_SHA1;
+		case PRF_HMAC_SHA2_256:
+			return HASH_SHA256;
+		case PRF_HMAC_SHA2_384:
+			return HASH_SHA384;
+		case PRF_HMAC_SHA2_512:
+			return HASH_SHA512;
+		case PRF_HMAC_TIGER:
+		case PRF_AES128_XCBC:
+		case PRF_AES128_CMAC:
+		case PRF_FIPS_DES:
+		case PRF_CAMELLIA128_XCBC:
+		case PRF_UNDEFINED:
+			break;
+	}
+	return HASH_UNKNOWN;
+}
+
 /*
  * Described in header.
  */

src/libstrongswan/crypto/hashers/hasher.h

@@ -27,6 +27,7 @@ typedef enum hash_algorithm_t hash_algorithm_t;
 typedef struct hasher_t hasher_t;
 
 #include <library.h>
+#include <crypto/prfs/prf.h>
 #include <crypto/signers/signer.h>
 #include <credentials/keys/public_key.h>
 
@@ -119,6 +120,14 @@ struct hasher_t {
  */
 hash_algorithm_t hasher_algorithm_from_oid(int oid);
 
+/**
+ * Conversion of PRF algorithm to hash algorithm (if based on one).
+ *
+ * @param alg			prf algorithm
+ * @return				hash algorithm, HASH_UNKNOWN if not based on a hash
+ */
+hash_algorithm_t hasher_algorithm_from_prf(pseudo_random_function_t alg);
+
 /**
  * Conversion of integrity algorithm to hash algorithm (if based on one).
  *