X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fciphers%2Frc6.c;fp=libtomcrypt%2Fsrc%2Fciphers%2Frc6.c;h=56ca705b6adf3b64ca3d7d68816cb3be50c9afd4;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/ciphers/rc6.c b/libtomcrypt/src/ciphers/rc6.c
new file mode 100644
index 0000000..56ca705
--- /dev/null
+++ b/libtomcrypt/src/ciphers/rc6.c
@@ -0,0 +1,331 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+
+/**
+   @file rc6.c
+   LTC_RC6 code by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#ifdef LTC_RC6
+
+const struct ltc_cipher_descriptor rc6_desc =
+{
+    "rc6",
+    3,
+    8, 128, 16, 20,
+    &rc6_setup,
+    &rc6_ecb_encrypt,
+    &rc6_ecb_decrypt,
+    &rc6_test,
+    &rc6_done,
+    &rc6_keysize,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+
+static const ulong32 stab[44] = {
+0xb7e15163UL, 0x5618cb1cUL, 0xf45044d5UL, 0x9287be8eUL, 0x30bf3847UL, 0xcef6b200UL, 0x6d2e2bb9UL, 0x0b65a572UL,
+0xa99d1f2bUL, 0x47d498e4UL, 0xe60c129dUL, 0x84438c56UL, 0x227b060fUL, 0xc0b27fc8UL, 0x5ee9f981UL, 0xfd21733aUL,
+0x9b58ecf3UL, 0x399066acUL, 0xd7c7e065UL, 0x75ff5a1eUL, 0x1436d3d7UL, 0xb26e4d90UL, 0x50a5c749UL, 0xeedd4102UL,
+0x8d14babbUL, 0x2b4c3474UL, 0xc983ae2dUL, 0x67bb27e6UL, 0x05f2a19fUL, 0xa42a1b58UL, 0x42619511UL, 0xe0990ecaUL,
+0x7ed08883UL, 0x1d08023cUL, 0xbb3f7bf5UL, 0x5976f5aeUL, 0xf7ae6f67UL, 0x95e5e920UL, 0x341d62d9UL, 0xd254dc92UL,
+0x708c564bUL, 0x0ec3d004UL, 0xacfb49bdUL, 0x4b32c376UL };
+
+ /**
+    Initialize the LTC_RC6 block cipher
+    @param key The symmetric key you wish to pass
+    @param keylen The key length in bytes
+    @param num_rounds The number of rounds desired (0 for default)
+    @param skey The key in as scheduled by this function.
+    @return CRYPT_OK if successful
+ */
+#ifdef LTC_CLEAN_STACK
+static int _rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
+#else
+int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
+#endif
+{
+    ulong32 L[64], S[50], A, B, i, j, v, s, l;
+
+    LTC_ARGCHK(key != NULL);
+    LTC_ARGCHK(skey != NULL);
+
+    /* test parameters */
+    if (num_rounds != 0 && num_rounds != 20) {
+       return CRYPT_INVALID_ROUNDS;
+    }
+
+    /* key must be between 64 and 1024 bits */
+    if (keylen < 8 || keylen > 128) {
+       return CRYPT_INVALID_KEYSIZE;
+    }
+
+    /* copy the key into the L array */
+    for (A = i = j = 0; i < (ulong32)keylen; ) {
+        A = (A << 8) | ((ulong32)(key[i++] & 255));
+        if (!(i & 3)) {
+           L[j++] = BSWAP(A);
+           A = 0;
+        }
+    }
+
+    /* handle odd sized keys */
+    if (keylen & 3) {
+       A <<= (8 * (4 - (keylen&3)));
+       L[j++] = BSWAP(A);
+    }
+
+    /* setup the S array */
+    XMEMCPY(S, stab, 44 * sizeof(stab[0]));
+
+    /* mix buffer */
+    s = 3 * MAX(44, j);
+    l = j;
+    for (A = B = i = j = v = 0; v < s; v++) {
+        A = S[i] = ROLc(S[i] + A + B, 3);
+        B = L[j] = ROL(L[j] + A + B, (A+B));
+        if (++i == 44) { i = 0; }
+        if (++j == l)  { j = 0; }
+    }
+
+    /* copy to key */
+    for (i = 0; i < 44; i++) {
+        skey->rc6.K[i] = S[i];
+    }
+    return CRYPT_OK;
+}
+
+#ifdef LTC_CLEAN_STACK
+int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
+{
+   int x;
+   x = _rc6_setup(key, keylen, num_rounds, skey);
+   burn_stack(sizeof(ulong32) * 122);
+   return x;
+}
+#endif
+
+/**
+  Encrypts a block of text with LTC_RC6
+  @param pt The input plaintext (16 bytes)
+  @param ct The output ciphertext (16 bytes)
+  @param skey The key as scheduled
+*/
+#ifdef LTC_CLEAN_STACK
+static int _rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
+#else
+int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
+#endif
+{
+   ulong32 a,b,c,d,t,u, *K;
+   int r;
+
+   LTC_ARGCHK(skey != NULL);
+   LTC_ARGCHK(pt   != NULL);
+   LTC_ARGCHK(ct   != NULL);
+   LOAD32L(a,&pt[0]);LOAD32L(b,&pt[4]);LOAD32L(c,&pt[8]);LOAD32L(d,&pt[12]);
+
+   b += skey->rc6.K[0];
+   d += skey->rc6.K[1];
+
+#define RND(a,b,c,d) \
+       t = (b * (b + b + 1)); t = ROLc(t, 5); \
+       u = (d * (d + d + 1)); u = ROLc(u, 5); \
+       a = ROL(a^t,u) + K[0];                \
+       c = ROL(c^u,t) + K[1]; K += 2;
+
+   K = skey->rc6.K + 2;
+   for (r = 0; r < 20; r += 4) {
+       RND(a,b,c,d);
+       RND(b,c,d,a);
+       RND(c,d,a,b);
+       RND(d,a,b,c);
+   }
+
+#undef RND
+
+   a += skey->rc6.K[42];
+   c += skey->rc6.K[43];
+   STORE32L(a,&ct[0]);STORE32L(b,&ct[4]);STORE32L(c,&ct[8]);STORE32L(d,&ct[12]);
+   return CRYPT_OK;
+}
+
+#ifdef LTC_CLEAN_STACK
+int rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
+{
+   int err = _rc6_ecb_encrypt(pt, ct, skey);
+   burn_stack(sizeof(ulong32) * 6 + sizeof(int));
+   return err;
+}
+#endif
+
+/**
+  Decrypts a block of text with LTC_RC6
+  @param ct The input ciphertext (16 bytes)
+  @param pt The output plaintext (16 bytes)
+  @param skey The key as scheduled
+*/
+#ifdef LTC_CLEAN_STACK
+static int _rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
+#else
+int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
+#endif
+{
+   ulong32 a,b,c,d,t,u, *K;
+   int r;
+
+   LTC_ARGCHK(skey != NULL);
+   LTC_ARGCHK(pt   != NULL);
+   LTC_ARGCHK(ct   != NULL);
+
+   LOAD32L(a,&ct[0]);LOAD32L(b,&ct[4]);LOAD32L(c,&ct[8]);LOAD32L(d,&ct[12]);
+   a -= skey->rc6.K[42];
+   c -= skey->rc6.K[43];
+
+#define RND(a,b,c,d) \
+       t = (b * (b + b + 1)); t = ROLc(t, 5); \
+       u = (d * (d + d + 1)); u = ROLc(u, 5); \
+       c = ROR(c - K[1], t) ^ u; \
+       a = ROR(a - K[0], u) ^ t; K -= 2;
+
+   K = skey->rc6.K + 40;
+
+   for (r = 0; r < 20; r += 4) {
+       RND(d,a,b,c);
+       RND(c,d,a,b);
+       RND(b,c,d,a);
+       RND(a,b,c,d);
+   }
+
+#undef RND
+
+   b -= skey->rc6.K[0];
+   d -= skey->rc6.K[1];
+   STORE32L(a,&pt[0]);STORE32L(b,&pt[4]);STORE32L(c,&pt[8]);STORE32L(d,&pt[12]);
+
+   return CRYPT_OK;
+}
+
+#ifdef LTC_CLEAN_STACK
+int rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
+{
+   int err = _rc6_ecb_decrypt(ct, pt, skey);
+   burn_stack(sizeof(ulong32) * 6 + sizeof(int));
+   return err;
+}
+#endif
+
+/**
+  Performs a self-test of the LTC_RC6 block cipher
+  @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
+*/
+int rc6_test(void)
+{
+ #ifndef LTC_TEST
+    return CRYPT_NOP;
+ #else
+   static const struct {
+       int keylen;
+       unsigned char key[32], pt[16], ct[16];
+   } tests[] = {
+   {
+       16,
+       { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+         0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
+         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+       { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
+         0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
+       { 0x52, 0x4e, 0x19, 0x2f, 0x47, 0x15, 0xc6, 0x23,
+         0x1f, 0x51, 0xf6, 0x36, 0x7e, 0xa4, 0x3f, 0x18 }
+   },
+   {
+       24,
+       { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+         0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
+         0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
+         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+       { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
+         0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
+       { 0x68, 0x83, 0x29, 0xd0, 0x19, 0xe5, 0x05, 0x04,
+         0x1e, 0x52, 0xe9, 0x2a, 0xf9, 0x52, 0x91, 0xd4 }
+   },
+   {
+       32,
+       { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
+         0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
+         0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0,
+         0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe },
+       { 0x02, 0x13, 0x24, 0x35, 0x46, 0x57, 0x68, 0x79,
+         0x8a, 0x9b, 0xac, 0xbd, 0xce, 0xdf, 0xe0, 0xf1 },
+       { 0xc8, 0x24, 0x18, 0x16, 0xf0, 0xd7, 0xe4, 0x89,
+         0x20, 0xad, 0x16, 0xa1, 0x67, 0x4e, 0x5d, 0x48 }
+   }
+   };
+   unsigned char tmp[2][16];
+   int x, y, err;
+   symmetric_key key;
+
+   for (x  = 0; x < (int)(sizeof(tests) / sizeof(tests[0])); x++) {
+      /* setup key */
+      if ((err = rc6_setup(tests[x].key, tests[x].keylen, 0, &key)) != CRYPT_OK) {
+         return err;
+      }
+
+      /* encrypt and decrypt */
+      rc6_ecb_encrypt(tests[x].pt, tmp[0], &key);
+      rc6_ecb_decrypt(tmp[0], tmp[1], &key);
+
+      /* compare */
+      if (compare_testvector(tmp[0], 16, tests[x].ct, 16, "RC6 Encrypt", x) ||
+            compare_testvector(tmp[1], 16, tests[x].pt, 16, "RC6 Decrypt", x)) {
+         return CRYPT_FAIL_TESTVECTOR;
+      }
+
+      /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
+      for (y = 0; y < 16; y++) tmp[0][y] = 0;
+      for (y = 0; y < 1000; y++) rc6_ecb_encrypt(tmp[0], tmp[0], &key);
+      for (y = 0; y < 1000; y++) rc6_ecb_decrypt(tmp[0], tmp[0], &key);
+      for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
+   }
+   return CRYPT_OK;
+  #endif
+}
+
+/** Terminate the context
+   @param skey    The scheduled key
+*/
+void rc6_done(symmetric_key *skey)
+{
+  LTC_UNUSED_PARAM(skey);
+}
+
+/**
+  Gets suitable key size
+  @param keysize [in/out] The length of the recommended key (in bytes).  This function will store the suitable size back in this variable.
+  @return CRYPT_OK if the input key size is acceptable.
+*/
+int rc6_keysize(int *keysize)
+{
+   LTC_ARGCHK(keysize != NULL);
+   if (*keysize < 8) {
+      return CRYPT_INVALID_KEYSIZE;
+   } else if (*keysize > 128) {
+      *keysize = 128;
+   }
+   return CRYPT_OK;
+}
+
+#endif /*LTC_RC6*/
+
+
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */