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-rw-r--r--ChangeLog13
-rw-r--r--camellia-meta.c6
-rw-r--r--camellia.c98
-rw-r--r--camellia.h48
4 files changed, 74 insertions, 91 deletions
diff --git a/ChangeLog b/ChangeLog
index 84f1af67..25011669 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,18 @@
2010-07-20 Niels Möller <nisse@lysator.liu.se>
+ * camellia.h (struct camellia_ctx): Replaced flag camellia128 by
+ expanded key length nkeys.
+
+ * camellia.c (camellia_set_encrypt_key): Renamed, from...
+ (camellia_set_key): ... old name.
+ (camellia_invert_key): New function.
+ (camellia_set_decrypt_key): New function, using
+ camellia_invert_key.
+ (camellia_crypt): Renamed, from...
+ (camellia_encrypt): ... old name.
+ (camellia_decrypt): Deleted, no longer needed. camellia_crypt used
+ for both encryption and decryption.
+
* nettle-meta.h (_NETTLE_CIPHER_SEP_SET_KEY): New macro.
* dsa-keygen.c: Removed unnecessary include of memxor.h.
diff --git a/camellia-meta.c b/camellia-meta.c
index 0311af33..68eef3dd 100644
--- a/camellia-meta.c
+++ b/camellia-meta.c
@@ -29,10 +29,10 @@
#include "camellia.h"
const struct nettle_cipher nettle_camellia128
-= _NETTLE_CIPHER(camellia, CAMELLIA, 128);
+= _NETTLE_CIPHER_SEP_SET_KEY(camellia, CAMELLIA, 128);
const struct nettle_cipher nettle_camellia192
-= _NETTLE_CIPHER(camellia, CAMELLIA, 192);
+= _NETTLE_CIPHER_SEP_SET_KEY(camellia, CAMELLIA, 192);
const struct nettle_cipher nettle_camellia256
-= _NETTLE_CIPHER(camellia, CAMELLIA, 256);
+= _NETTLE_CIPHER_SEP_SET_KEY(camellia, CAMELLIA, 256);
diff --git a/camellia.c b/camellia.c
index 1325a934..44b6d938 100644
--- a/camellia.c
+++ b/camellia.c
@@ -751,7 +751,7 @@ camellia_setup256(struct camellia_ctx *ctx, uint64_t *key)
subkey[4] ^= kw4;
subkey[2] ^= kw4;
subkey[0] ^= kw4;
-
+
/* key XOR is end of F-function */
ctx->keys[0] = subkey[0] ^subkey[2];
@@ -818,7 +818,7 @@ camellia_setup256(struct camellia_ctx *ctx, uint64_t *key)
ctx->keys[31] = subkey[30];
ctx->keys[32] = subkey[32] ^ subkey[31];
- /* apply the inverse of the last half of P-function */
+ /* apply the inverse of the last half of F-function */
CAMELLIA_F_HALF_INV(ctx->keys[2]);
CAMELLIA_F_HALF_INV(ctx->keys[3]);
CAMELLIA_F_HALF_INV(ctx->keys[4]);
@@ -851,8 +851,8 @@ camellia_setup256(struct camellia_ctx *ctx, uint64_t *key)
}
void
-camellia_set_key(struct camellia_ctx *ctx,
- unsigned length, const uint8_t *key)
+camellia_set_encrypt_key(struct camellia_ctx *ctx,
+ unsigned length, const uint8_t *key)
{
uint64_t k[4];
k[0] = READ_UINT64(key);
@@ -860,12 +860,12 @@ camellia_set_key(struct camellia_ctx *ctx,
if (length == 16)
{
- ctx->camellia128 = 1;
+ ctx->nkeys = 26;
camellia_setup128(ctx, k);
}
else
{
- ctx->camellia128 = 0;
+ ctx->nkeys = 34;
k[2] = READ_UINT64(key + 16);
if (length == 24)
@@ -877,10 +877,43 @@ camellia_set_key(struct camellia_ctx *ctx,
}
camellia_setup256(ctx, k);
}
-}
+}
+
+#define SWAP(a, b) \
+do { uint64_t t_swap = (a); (a) = (b); (b) = t_swap; } while(0)
+
+void
+camellia_invert_key(struct camellia_ctx *dst,
+ const struct camellia_ctx *src)
+{
+ unsigned nkeys = src->nkeys;
+ unsigned i;
+ if (dst == src)
+ {
+ SWAP(dst->keys[0], dst->keys[nkeys - 2]);
+ for (i = 2; i < nkeys - 1 - i; i++)
+ SWAP(dst->keys[i], dst->keys[nkeys - 1 - i]);
+ }
+ else
+ {
+ dst->nkeys = nkeys;
+ dst->keys[0] = src->keys[nkeys - 2];
+ for (i = 2; i < nkeys - 2; i++)
+ dst->keys[i] = src->keys[nkeys - 1 - i];
+ dst->keys[nkeys - 2] = src->keys[0];
+ }
+}
void
-camellia_encrypt(const struct camellia_ctx *ctx,
+camellia_set_decrypt_key(struct camellia_ctx *ctx,
+ unsigned length, const uint8_t *key)
+{
+ camellia_set_encrypt_key(ctx, length, key);
+ camellia_invert_key(ctx, ctx);
+}
+
+void
+camellia_crypt(const struct camellia_ctx *ctx,
unsigned length, uint8_t *dst,
const uint8_t *src)
{
@@ -904,7 +937,7 @@ camellia_encrypt(const struct camellia_ctx *ctx,
CAMELLIA_ROUNDSM(i0,ctx->keys[6], i1);
CAMELLIA_ROUNDSM(i1,ctx->keys[7], i0);
- for (i = 0; i < 16 + 8 * !ctx->camellia128; i+= 8)
+ for (i = 0; i < ctx->nkeys - 10; i+= 8)
{
CAMELLIA_FL(i0, ctx->keys[i+8]);
CAMELLIA_FLINV(i1, ctx->keys[i+9]);
@@ -924,50 +957,3 @@ camellia_encrypt(const struct camellia_ctx *ctx,
WRITE_UINT64(dst + 8, i0);
}
}
-
-void
-camellia_decrypt(const struct camellia_ctx *ctx,
- unsigned length, uint8_t *dst,
- const uint8_t *src)
-{
- FOR_BLOCKS(length, dst, src, CAMELLIA_BLOCK_SIZE)
- {
- uint64_t i0,i1;
- unsigned i;
-
- i0 = READ_UINT64(src);
- i1 = READ_UINT64(src + 8);
-
- i = ctx->camellia128 ? 24 : 32;
-
- /* pre whitening but absorb kw2*/
- i0 ^= ctx->keys[i];
-
- /* main iteration */
-
- for (i -= 8; i >= 8; i -= 8)
- {
- CAMELLIA_ROUNDSM(i0,ctx->keys[i+7], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[i+6], i0);
- CAMELLIA_ROUNDSM(i0,ctx->keys[i+5], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[i+4], i0);
- CAMELLIA_ROUNDSM(i0,ctx->keys[i+3], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[i+2], i0);
-
- CAMELLIA_FL(i0, ctx->keys[i+1]);
- CAMELLIA_FLINV(i1, ctx->keys[i]);
- }
- CAMELLIA_ROUNDSM(i0,ctx->keys[7], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[6], i0);
- CAMELLIA_ROUNDSM(i0,ctx->keys[5], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[4], i0);
- CAMELLIA_ROUNDSM(i0,ctx->keys[3], i1);
- CAMELLIA_ROUNDSM(i1,ctx->keys[2], i0);
-
- /* post whitening but kw4 */
- i1 ^= ctx->keys[0];
-
- WRITE_UINT64(dst , i1);
- WRITE_UINT64(dst + 8, i0);
- }
-}
diff --git a/camellia.h b/camellia.h
index 11ab593d..db266287 100644
--- a/camellia.h
+++ b/camellia.h
@@ -30,9 +30,11 @@ extern "C" {
#endif
/* Name mangling */
-#define camellia_set_key nettle_camellia_set_key
-#define camellia_encrypt nettle_camellia_encrypt
-#define camellia_decrypt nettle_camellia_decrypt
+#define camellia_set_encrypt_key nettle_camellia_set_encrypt_key
+#define camellia_set_decrypt_key nettle_camellia_set_decrypt_key
+#define camellia_invert_key nettle_camellia_invert_key
+#define camellia_crypt nettle_camellia_crypt
+#define camellia_crypt nettle_camellia_crypt
#define CAMELLIA_BLOCK_SIZE 16
/* Valid key sizes are 128, 192 or 256 bits (16, 24 or 32 bytes) */
@@ -42,38 +44,22 @@ extern "C" {
struct camellia_ctx
{
- int camellia128;
-
+ /* Number of subkeys. */
+ unsigned nkeys;
+
/* For 128-bit keys, there are 18 regular rounds, pre- and
post-whitening, and two FL and FLINV rounds, using a total of 26
subkeys, each of 64 bit. For 192- and 256-bit keys, there are 6
additional regular rounds and one additional FL and FLINV, using
a total of 34 subkeys. */
/* The clever combination of subkeys imply one of the pre- and
- post-whitening keys is folded fith the round keys, so that subkey
- subkey #1 and the last one (#25 or #33) is not used. FIXME:
- Renumber to eliminate them. */
+ post-whitening keys is folded with the round keys, so that subkey
+ #1 and the last one (#25 or #33) is not used. FIXME: Renumber to
+ eliminate them. */
uint64_t keys[34];
};
void
-camellia_set_key(struct camellia_ctx *ctx,
- unsigned length, const uint8_t *key);
-
-void
-camellia_encrypt(const struct camellia_ctx *ctx,
- unsigned length, uint8_t *dst,
- const uint8_t *src);
-void
-camellia_decrypt(const struct camellia_ctx *ctx,
- unsigned length, uint8_t *dst,
- const uint8_t *src);
-
-#if 0
-/* FIXME: Use a single crypt function, and let key setup for
- decryption reverse the order of the subkeys. */
-
-void
camellia_set_encrypt_key(struct camellia_ctx *ctx,
unsigned length, const uint8_t *key);
@@ -82,15 +68,13 @@ camellia_set_decrypt_key(struct camellia_ctx *ctx,
unsigned length, const uint8_t *key);
void
-camellia_crypt(struct camellia_ctx *ctx,
- unsigned length, uint8_t *dst,
- const uint8_t *src);
-
-void
camellia_invert_key(struct camellia_ctx *dst,
const struct camellia_ctx *src);
-
-#endif
+
+void
+camellia_crypt(const struct camellia_ctx *ctx,
+ unsigned length, uint8_t *dst,
+ const uint8_t *src);
#ifdef __cplusplus
}
#endif
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