Crypto IOV API per Projects/AEAD encryption API

Merge in the mskrb-crypto-iov branch at r21259 in order to move an
implementation of
http://k5wiki.kerberos.org/wiki/Projects/AEAD_encryption_API onto the
trunk.  This branch contains a subset of the commits on the
mskrb-integ branch that implement the krb5 library part of the crypto
IOV API.

ticket: new
Status: open

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@21263 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 94 insertions, 0 deletions

diff --git a/src/lib/crypto/aead.h b/src/lib/crypto/aead.h
new file mode 100644
index 000000000..f183d1a05
--- /dev/null
+++ b/src/lib/crypto/aead.h
@@ -0,0 +1,94 @@
+/*
+ * lib/crypto/aead.h
+ *
+ * Copyright 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ * 
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#include "k5-int.h"
+
+/* AEAD helpers */
+
+krb5_crypto_iov * KRB5_CALLCONV
+krb5int_c_locate_iov(krb5_crypto_iov *data,
+		     size_t num_data,
+		     krb5_cryptotype type);
+
+krb5_error_code KRB5_CALLCONV
+krb5int_c_make_checksum_iov(const struct krb5_cksumtypes *cksum,
+			    const krb5_keyblock *key,
+			    krb5_keyusage usage,
+			    const krb5_crypto_iov *data,
+			    size_t num_data,
+			    krb5_data *cksum_data);
+
+const struct krb5_cksumtypes * KRB5_CALLCONV
+krb5int_c_find_checksum_type(krb5_cksumtype cksumtype);
+
+#define ENCRYPT_CONF_IOV(_iov)	((_iov)->flags == KRB5_CRYPTO_TYPE_HEADER)
+
+#define ENCRYPT_DATA_IOV(_iov)	((_iov)->flags == KRB5_CRYPTO_TYPE_DATA || \
+				 (_iov)->flags == KRB5_CRYPTO_TYPE_PADDING)
+
+#define ENCRYPT_IOV(_iov)	(ENCRYPT_CONF_IOV(_iov) || ENCRYPT_DATA_IOV(_iov))
+
+#define SIGN_IOV(_iov)		(ENCRYPT_IOV(_iov) || \
+				 (_iov)->flags == KRB5_CRYPTO_TYPE_SIGN_ONLY )
+
+struct iov_block_state {
+    size_t iov_pos;			/* index into iov array */
+    size_t data_pos;			/* index into iov contents */
+    unsigned int ignore_header : 1;	/* have/should we process HEADER */
+    unsigned int include_sign_only : 1;	/* should we process SIGN_ONLY blocks */
+    unsigned int pad_to_boundary : 1;	/* should we zero fill blocks until next buffer */
+};
+
+#define IOV_BLOCK_STATE_INIT(_state)	((_state)->iov_pos = \
+					 (_state)->data_pos = \
+					 (_state)->ignore_header = \
+					 (_state)->include_sign_only = \
+					 (_state)->pad_to_boundary = 0)
+
+krb5_boolean KRB5_CALLCONV
+krb5int_c_iov_get_block(unsigned char *block,
+			size_t block_size,
+			const krb5_crypto_iov *data,
+			size_t num_data,
+			struct iov_block_state *iov_state);
+
+krb5_boolean KRB5_CALLCONV
+krb5int_c_iov_put_block(const krb5_crypto_iov *data,
+			size_t num_data,
+			unsigned char *block,
+			size_t block_size,
+			struct iov_block_state *iov_state);
+
+krb5_error_code KRB5_CALLCONV
+krb5int_c_iov_decrypt_stream(const struct krb5_aead_provider *aead,
+			     const struct krb5_enc_provider *enc,
+			     const struct krb5_hash_provider *hash,
+			     const krb5_keyblock *key,
+			     krb5_keyusage keyusage,
+			     const krb5_data *ivec,
+			     krb5_crypto_iov *data,
+			     size_t num_data);
+