consolidate sha configs

Author: kkuehlz

include/cthash/sha3/common.hpp

@@ -308,6 +308,15 @@ template <typename Config> struct keccak_hasher: basic_keccak_hasher<Config> {
 	using super::final;
 };
 
+template <size_t DigestBits>
+struct sha_config {
+	static constexpr size_t digest_length_bit = DigestBits;
+	static constexpr size_t capacity_bit = DigestBits * 2u;
+	static constexpr size_t rate_bit = 1600u - capacity_bit;
+
+	static constexpr auto suffix = keccak_suffix(2, 0b0000'0010u); // in reverse
+};
+
 } // namespace cthash
 
 #endif

include/cthash/sha3/sha3-224.hpp

@@ -5,14 +5,7 @@
 
 namespace cthash {
 
-struct sha3_224_config {
-	static constexpr size_t digest_length_bit = 224u;
-	static constexpr size_t capacity_bit = digest_length_bit * 2u;
-	static constexpr size_t rate_bit = 1600u - capacity_bit;
-
-	static constexpr auto suffix = keccak_suffix(2, 0b0000'0010u); // in reverse
-};
-
+using sha3_224_config = sha_config<224u>;
 static_assert((sha3_224_config::capacity_bit + sha3_224_config::rate_bit) == 1600u);
 
 using sha3_224 = cthash::keccak_hasher<sha3_224_config>;

include/cthash/sha3/sha3-256.hpp

@@ -5,14 +5,7 @@
 
 namespace cthash {
 
-struct sha3_256_config {
-	static constexpr size_t digest_length_bit = 256u;
-	static constexpr size_t capacity_bit = digest_length_bit * 2u;
-	static constexpr size_t rate_bit = 1600u - capacity_bit;
-
-	static constexpr auto suffix = keccak_suffix(2, 0b0000'0010u); // in reverse
-};
-
+using sha3_256_config = sha_config<256u>;
 static_assert((sha3_256_config::capacity_bit + sha3_256_config::rate_bit) == 1600u);
 
 using sha3_256 = cthash::keccak_hasher<sha3_256_config>;

include/cthash/sha3/sha3-384.hpp

@@ -5,14 +5,7 @@
 
 namespace cthash {
 
-struct sha3_384_config {
-	static constexpr size_t digest_length_bit = 384u;
-	static constexpr size_t capacity_bit = digest_length_bit * 2u;
-	static constexpr size_t rate_bit = 1600u - capacity_bit;
-
-	static constexpr auto suffix = keccak_suffix(2, 0b0000'0010u); // in reverse
-};
-
+using sha3_384_config = sha_config<384u>;
 static_assert((sha3_384_config::capacity_bit + sha3_384_config::rate_bit) == 1600u);
 
 using sha3_384 = cthash::keccak_hasher<sha3_384_config>;

include/cthash/sha3/sha3-512.hpp

@@ -5,14 +5,7 @@
 
 namespace cthash {
 
-struct sha3_512_config {
-	static constexpr size_t digest_length_bit = 512u;
-	static constexpr size_t capacity_bit = digest_length_bit * 2u;
-	static constexpr size_t rate_bit = 1600u - capacity_bit;
-
-	static constexpr auto suffix = keccak_suffix(2, 0b0000'0010u); // in reverse
-};
-
+using sha3_512_config = sha_config<512u>;
 static_assert((sha3_512_config::capacity_bit + sha3_512_config::rate_bit) == 1600u);
 
 using sha3_512 = cthash::keccak_hasher<sha3_512_config>;