[crypto] Add concept of authentication tag to cipher algorithms

Some ciphers (such as GCM) support the concept of a tag that can be
used to authenticate the encrypted data.  Add a cipher method for
generating an authentication tag.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/aes.c

@@ -783,10 +783,12 @@ struct cipher_algorithm aes_algorithm = {
 	.name = "aes",
 	.ctxsize = sizeof ( struct aes_context ),
 	.blocksize = AES_BLOCKSIZE,
+	.authsize = 0,
 	.setkey = aes_setkey,
 	.setiv = cipher_null_setiv,
 	.encrypt = aes_encrypt,
 	.decrypt = aes_decrypt,
+	.auth = cipher_null_auth,
 };
 
 /* AES in Electronic Codebook mode */

src/crypto/arc4.c

@@ -119,8 +119,10 @@ struct cipher_algorithm arc4_algorithm = {
 	.name = "ARC4",
 	.ctxsize = ARC4_CTX_SIZE,
 	.blocksize = 1,
+	.authsize = 0,
 	.setkey = arc4_setkey,
 	.setiv = cipher_null_setiv,
 	.encrypt = arc4_xor,
 	.decrypt = arc4_xor,
+	.auth = cipher_null_auth,
 };

src/crypto/crypto_null.c

@@ -76,14 +76,20 @@ void cipher_null_decrypt ( void *ctx __unused, const void *src, void *dst,
 	memcpy ( dst, src, len );
 }
 
+void cipher_null_auth ( void *ctx __unused, void *auth __unused ) {
+	/* Do nothing */
+}
+
 struct cipher_algorithm cipher_null = {
 	.name = "null",
 	.ctxsize = 0,
 	.blocksize = 1,
+	.authsize = 0,
 	.setkey = cipher_null_setkey,
 	.setiv = cipher_null_setiv,
 	.encrypt = cipher_null_encrypt,
 	.decrypt = cipher_null_decrypt,
+	.auth = cipher_null_auth,
 };
 
 int pubkey_null_init ( void *ctx __unused, const void *key __unused,