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[avr-crypto-lib.git] / noekeon / noekeon_cbc_enc.S

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+/* noekeon_cbc_enc.S */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+ * \author  Daniel Otte
+ * \email   daniel.otte@rub.de
+ * \date    2008-08-06
+ * \license GPLv3 or later
+ *
+ *
+ *
+ */
+
+.macro push_ p1:req p2:vararg
+       push \p1
+.ifnb \p2
+       push_ \p2
+.endif
+.endm
+
+.macro pop_ p1:req p2:vararg
+       pop \p1
+.ifnb \p2
+       pop_ \p2
+.endif
+.endm
+
+.extern noekeon_enc
+
+/*
+ * void noekeon_cbc_enc(void* buffer, uint8_t block_cnt, const void* key)
+ */
+
+/* param buffer    is passed in r24:r25
+ * param block_cnt is passed in r22 (r23 is 0)
+ * param key       is passed in r20:r21
+ */
+.global noekeon_cbc_enc
+ noekeon_cbc_enc:
+       push r22
+       movw r22, r20
+       push_ r22, r23, r24, r25
+       rcall noekeon_enc
+1:
+       pop_ r27, r26, r23, r22
+       pop r16 /* block  counter */
+       dec r16
+       breq 9f
+       push r16
+       /* xor blocks */
+       movw r30, r26
+       adiw r30, 16
+       ldi r16, 16
+2:
+       ld r17, X+
+       ld r18, Z
+       eor r18, r17
+       st Z+, r18
+       dec r16
+       brne 2b
+
+       /* call encryption function; X points to our new block */
+       push_ r22, r23, r26, r27
+       movw r24, r26
+       rcall noekeon_enc
+       rjmp 1b
+9:
+       ret
+
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