X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=tfpcbc.c;fp=tfpcbc.c;h=72ac9a34a0e696146e501a7e61619326a1af5fb4;hb=f5397c396bfedcd6de90ab648fa600aca3b22bbb;hp=0000000000000000000000000000000000000000;hpb=f19b128a9a0d1ee4a1afe581d877e97cfd84a803;p=tfcrypt.git

diff --git a/tfpcbc.c b/tfpcbc.c
new file mode 100644
index 0000000..72ac9a3
--- /dev/null
+++ b/tfpcbc.c
@@ -0,0 +1,86 @@
+#include <string.h>
+#include "tfdef.h"
+
+void tf_pcbc_encrypt(const void *key, void *iv, void *out, const void *in, size_t sz)
+{
+	const TF_BYTE_TYPE *uin = (const TF_BYTE_TYPE *)in;
+	TF_BYTE_TYPE *uout = (TF_BYTE_TYPE *)out;
+	TF_UNIT_TYPE x[TF_NR_BLOCK_UNITS], y[TF_NR_BLOCK_UNITS];
+	TF_UNIT_TYPE *uiv = (TF_UNIT_TYPE *)iv;
+	const TF_UNIT_TYPE *ukey = (const TF_UNIT_TYPE *)key;
+	size_t sl = sz, i;
+
+	if (sl >= TF_BLOCK_SIZE) {
+		do {
+			memcpy(x, uin, TF_BLOCK_SIZE);
+			uin += TF_BLOCK_SIZE;
+			data_to_words(x, TF_BLOCK_SIZE);
+
+			for (i = 0; i < TF_NR_BLOCK_UNITS; i++) y[i] = x[i] ^ uiv[i];
+			tf_encrypt_rawblk(y, y, ukey);
+			for (i = 0; i < TF_NR_BLOCK_UNITS; i++) uiv[i] = y[i] ^ x[i];
+
+			data_to_words(y, TF_BLOCK_SIZE);
+			memcpy(uout, y, TF_BLOCK_SIZE);
+			uout += TF_BLOCK_SIZE;
+		} while ((sl -= TF_BLOCK_SIZE) >= TF_BLOCK_SIZE);
+	}
+
+	if (sl) {
+		memset(x, 0, TF_BLOCK_SIZE);
+		memcpy(x, uin, sl);
+		data_to_words(x, TF_BLOCK_SIZE);
+
+		ctr_inc(uiv, TF_NR_BLOCK_UNITS);
+		tf_encrypt_rawblk(y, uiv, ukey);
+		for (i = 0; i < TF_NR_BLOCK_UNITS; i++) y[i] ^= x[i];
+
+		data_to_words(y, TF_BLOCK_SIZE);
+		memcpy(uout, y, sl);
+	}
+
+	memset(x, 0, TF_BLOCK_SIZE);
+	memset(y, 0, TF_BLOCK_SIZE);
+}
+
+void tf_pcbc_decrypt(const void *key, void *iv, void *out, const void *in, size_t sz)
+{
+	const TF_BYTE_TYPE *uin = (const TF_BYTE_TYPE *)in;
+	TF_BYTE_TYPE *uout = (TF_BYTE_TYPE *)out;
+	TF_UNIT_TYPE x[TF_NR_BLOCK_UNITS], y[TF_NR_BLOCK_UNITS];
+	TF_UNIT_TYPE *uiv = (TF_UNIT_TYPE *)iv;
+	const TF_UNIT_TYPE *ukey = (const TF_UNIT_TYPE *)key;
+	size_t sl = sz, i;
+
+	if (sl >= TF_BLOCK_SIZE) {
+		do {
+			memcpy(x, uin, TF_BLOCK_SIZE);
+			uin += TF_BLOCK_SIZE;
+			data_to_words(x, TF_BLOCK_SIZE);
+
+			tf_decrypt_rawblk(y, x, ukey);
+			for (i = 0; i < TF_NR_BLOCK_UNITS; i++) y[i] ^= uiv[i];
+			for (i = 0; i < TF_NR_BLOCK_UNITS; i++) uiv[i] = y[i] ^ x[i];
+
+			data_to_words(y, TF_BLOCK_SIZE);
+			memcpy(uout, y, TF_BLOCK_SIZE);
+			uout += TF_BLOCK_SIZE;
+		} while ((sl -= TF_BLOCK_SIZE) >= TF_BLOCK_SIZE);
+	}
+
+	if (sl) {
+		memset(x, 0, TF_BLOCK_SIZE);
+		memcpy(x, uin, sl);
+		data_to_words(x, TF_BLOCK_SIZE);
+
+		ctr_inc(uiv, TF_NR_BLOCK_UNITS);
+		tf_encrypt_rawblk(y, uiv, ukey);
+		for (i = 0; i < TF_NR_BLOCK_UNITS; i++) y[i] ^= x[i];
+
+		data_to_words(y, TF_BLOCK_SIZE);
+		memcpy(uout, y, sl);
+	}
+
+	memset(x, 0, TF_BLOCK_SIZE);
+	memset(y, 0, TF_BLOCK_SIZE);
+}