Generalise digest_algorithm to crypto_algorithm.

src/include/gpxe/chap.h

@@ -10,12 +10,12 @@
 #include <stdint.h>
 #include <gpxe/md5.h>
 
-struct digest_algorithm;
+struct crypto_algorithm;
 
 /** A CHAP challenge/response */
 struct chap_challenge {
 	/** Digest algorithm used for the response */
-	struct digest_algorithm *digest;
+	struct crypto_algorithm *digest;
 	/** Context used by the digest algorithm */
 	uint8_t *digest_context;
 	/** CHAP response */
@@ -25,7 +25,7 @@ struct chap_challenge {
 };
 
 extern int chap_init ( struct chap_challenge *chap,
-		       struct digest_algorithm *digest );
+		       struct crypto_algorithm *digest );
 extern void chap_update ( struct chap_challenge *chap, const void *data,
 			  size_t len );
 extern void chap_respond ( struct chap_challenge *chap );

src/include/gpxe/crypto.h

@@ -9,38 +9,78 @@
 
 #include <stdint.h>
 
-/**
- * A message-digest algorithm
- *
- */
-struct digest_algorithm {
+/** A cryptographic algorithm */
+struct crypto_algorithm {
 	/** Algorithm name */
 	const char *name;
-	/** Size of a context for this algorithm */
-	size_t context_len;
-	/** Size of a message digest for this algorithm */
-	size_t digest_len;
-	/**
-	 * Initialise digest algorithm
+	/** Context size */
+	size_t ctxsize;
+	/** Block size */
+	size_t blocksize;
+	/** Final output size */
+	size_t digestsize;
+	/** Initialise algorithm
 	 *
-	 * @v context		Context for digest operations
+	 * @v ctx		Context
 	 */
-	void ( * init ) ( void *context );
-	/**
-	 * Calculate digest over data buffer
+	void ( * init ) ( void *ctx );
+	/** Set key
 	 *
-	 * @v context		Context for digest operations
-	 * @v data		Data buffer
-	 * @v len		Length of data buffer
+	 * @v ctx		Context
+	 * @v key		Key
+	 * @v keylen		Key length
+	 * @ret rc		Return status code
 	 */
-	void ( * update ) ( void *context, const void *data, size_t len );
-	/**
-	 * Finish calculating digest
+	int ( * setkey ) ( void *ctx, void *key, size_t keylen );
+	/** Encode data
 	 *
-	 * @v context		Context for digest operations
-	 * @v digest		Buffer for message digest
+	 * @v ctx		Context
+	 * @v src		Data to encode
+	 * @v dst		Encoded data, or NULL
+	 * @v len		Length of data
+	 * @ret rc		Return status code
+	 *
+	 * For a cipher algorithm, the enciphered data should be
+	 * placed in @c dst.  For a digest algorithm, only the digest
+	 * state should be updated, and @c dst will be NULL.
+	 *
+	 * @v len is guaranteed to be a multiple of @c blocksize.
 	 */
-	void ( * finish ) ( void *context, void *digest );
+	void ( * encode ) ( void *ctx, const void *src, void *dst,
+			    size_t len );
+	/** Decode data
+	 *
+	 * @v ctx		Context
+	 * @v src		Data to decode
+	 * @v dst		Decoded data
+	 * @v len		Length of data
+	 * @ret rc		Return status code
+	 *
+	 * @v len is guaranteed to be a multiple of @c blocksize.
+	 */
+	void ( * decode ) ( void *ctx, const void *src, void *dst,
+			    size_t len );
+	/** Finalise algorithm
+	 *
+	 * @v ctx		Context
+	 * @v out		Algorithm final output
+	 */
+	void ( * final ) ( void *ctx, void *out );
 };
 
+static inline void digest_init ( struct crypto_algorithm *crypto,
+				 void *ctx ) {
+	crypto->init ( ctx );
+}
+
+static inline void digest_update ( struct crypto_algorithm *crypto,
+				   void *ctx, const void *data, size_t len ) {
+	crypto->encode ( ctx, data, NULL, len );
+}
+
+static inline void digest_final ( struct crypto_algorithm *crypto,
+				  void *ctx, void *out ) {
+	crypto->final ( ctx, out );
+}
+
 #endif /* _GPXE_CRYPTO_H */

src/include/gpxe/md5.h

@@ -1,8 +1,8 @@
 #ifndef _GPXE_MD5_H
 #define _GPXE_MD5_H
 
-struct digest_algorithm;
+struct crypto_algorithm;
 
-extern struct digest_algorithm md5_algorithm;
+extern struct crypto_algorithm md5_algorithm;
 
 #endif /* _GPXE_MD5_H */