2006-05-10 13:16:27 +00:00
parent 4e98759d32
commit 9cf5f29027
295 changed files with 2373 additions and 25177 deletions
@@ -0,0 +1,110 @@
+#ifndef _CBC_GENERIC_H
+#define _CBC_GENERIC_H
+/*
+ * CBC macro helpers
+ *
+ * Author: JuanJo Ciarlante <[email protected]>
+ *
+ * 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ * 
+ * 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.
+ *
+ */
+
+/*
+ * 	Heavily inspired in loop_AES
+ */
+#define CBC_IMPL_BLK16(name, ctx_type, addr_type, enc_func, dec_func) \
+int name(ctx_type *ctx, const u_int8_t * in, u_int8_t * out, int ilen, const u_int8_t * iv, int encrypt) { \
+	int ret=ilen, pos; \
+	const u_int32_t *iv_i; \
+	if ((ilen) % 16) return 0; \
+	if (encrypt) { \
+		pos=0; \
+		while(pos<ilen) { \
+			if (pos==0) \
+				iv_i=(const u_int32_t*) iv; \
+			else \
+				iv_i=(const u_int32_t*) (out-16); \
+			*((u_int32_t *)(&out[ 0])) = iv_i[0]^*((const u_int32_t *)(&in[ 0])); \
+			*((u_int32_t *)(&out[ 4])) = iv_i[1]^*((const u_int32_t *)(&in[ 4])); \
+			*((u_int32_t *)(&out[ 8])) = iv_i[2]^*((const u_int32_t *)(&in[ 8])); \
+			*((u_int32_t *)(&out[12])) = iv_i[3]^*((const u_int32_t *)(&in[12])); \
+			enc_func(ctx, (addr_type) out, (addr_type) out); \
+			in+=16; \
+			out+=16; \
+			pos+=16; \
+		} \
+	} else { \
+		pos=ilen-16; \
+		in+=pos; \
+		out+=pos; \
+		while(pos>=0) { \
+			dec_func(ctx, (const addr_type) in, (addr_type) out); \
+			if (pos==0) \
+				iv_i=(const u_int32_t*) (iv); \
+			else \
+				iv_i=(const u_int32_t*) (in-16); \
+			*((u_int32_t *)(&out[ 0])) ^= iv_i[0]; \
+			*((u_int32_t *)(&out[ 4])) ^= iv_i[1]; \
+			*((u_int32_t *)(&out[ 8])) ^= iv_i[2]; \
+			*((u_int32_t *)(&out[12])) ^= iv_i[3]; \
+			in-=16; \
+			out-=16; \
+			pos-=16; \
+		} \
+	} \
+	return ret; \
+} 
+#define CBC_IMPL_BLK8(name, ctx_type, addr_type,  enc_func, dec_func) \
+int name(ctx_type *ctx, u_int8_t * in, u_int8_t * out, int ilen, const u_int8_t * iv, int encrypt) { \
+	int ret=ilen, pos; \
+	const u_int32_t *iv_i; \
+	if ((ilen) % 8) return 0; \
+	if (encrypt) { \
+		pos=0; \
+		while(pos<ilen) { \
+			if (pos==0) \
+				iv_i=(const u_int32_t*) iv; \
+			else \
+				iv_i=(const u_int32_t*) (out-8); \
+			*((u_int32_t *)(&out[ 0])) = iv_i[0]^*((const u_int32_t *)(&in[ 0])); \
+			*((u_int32_t *)(&out[ 4])) = iv_i[1]^*((const u_int32_t *)(&in[ 4])); \
+			enc_func(ctx, (addr_type)out, (addr_type)out); \
+			in+=8; \
+			out+=8; \
+			pos+=8; \
+		} \
+	} else { \
+		pos=ilen-8; \
+		in+=pos; \
+		out+=pos; \
+		while(pos>=0) { \
+			dec_func(ctx, (const addr_type)in, (addr_type)out); \
+			if (pos==0) \
+				iv_i=(const u_int32_t*) (iv); \
+			else \
+				iv_i=(const u_int32_t*) (in-8); \
+			*((u_int32_t *)(&out[ 0])) ^= iv_i[0]; \
+			*((u_int32_t *)(&out[ 4])) ^= iv_i[1]; \
+			in-=8; \
+			out-=8; \
+			pos-=8; \
+		} \
+	} \
+	return ret; \
+} 
+#define CBC_DECL(name, ctx_type) \
+int name(ctx_type *ctx, u_int8_t * in, u_int8_t * out, int ilen, const u_int8_t * iv, int encrypt)
+/*
+Eg.:
+CBC_IMPL_BLK16(AES_cbc_encrypt, aes_context, u_int8_t *, aes_encrypt, aes_decrypt);
+CBC_DECL(AES_cbc_encrypt, aes_context);
+*/
+#endif /* _CBC_GENERIC_H */