+/** SHA-224 digest size */
+#define SHA224_DIGEST_SIZE ( SHA256_DIGEST_SIZE * 224 / 256 )
+
+extern void sha256_family_init ( struct sha256_context *context,
+ const struct sha256_digest *init,
+ size_t digestsize );
+extern void sha256_update ( void *ctx, const void *data, size_t len );
+extern void sha256_final ( void *ctx, void *out );
+