Diff: wolfcrypt/src/idea.c

Revision:

17:ff9d1e86ad5f

Parent:

16:048e5e270a58

--- a/wolfcrypt/src/idea.c	Tue Nov 19 14:32:16 2019 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,304 +0,0 @@
-/* idea.c
- *
- * Copyright (C) 2006-2017 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL 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.
- *
- * wolfSSL 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, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
-
-
-#ifdef HAVE_CONFIG_H
-    #include <config.h>
-#endif
-
-#include <wolfssl/wolfcrypt/settings.h>
-
-#ifdef HAVE_IDEA
-
-#include <wolfssl/wolfcrypt/idea.h>
-
-#include <wolfssl/wolfcrypt/error-crypt.h>
-#include <wolfssl/wolfcrypt/logging.h>
-
-#ifdef NO_INLINE
-    #include <wolfssl/wolfcrypt/misc.h>
-#else
-    #define WOLFSSL_MISC_INCLUDED
-    #include <wolfcrypt/src/misc.c>
-#endif
-
-/* multiplication of x and y modulo 2^16+1
- * IDEA specify a special case when an entry value is 0 ( x or y)
- * then it must be replaced by 2^16
- */
-static WC_INLINE word16 idea_mult(word16 x, word16 y)
-{
-    long mul, res;
-
-    mul = (long)x * (long)y;
-    if (mul) {
-        res = (mul & IDEA_MASK) - ((word32)mul >> 16);
-        if (res <= 0)
-            res += IDEA_MODULO;
-
-        return (word16) (res & IDEA_MASK);
-    }
-
-    if (!x)
-        return ((IDEA_MODULO - y) & IDEA_MASK);
-
-    /* !y */
-    return ((IDEA_MODULO - x) & IDEA_MASK);
-}
-
-/* compute 1/a modulo 2^16+1 using Extended euclidean algorithm
- * adapted from fp_invmod */
-static WC_INLINE word16 idea_invmod(word16 x)
-{
-    int   u, v, b, d;
-
-    if (x <= 1)
-        return x;
-
-    u = IDEA_MODULO;
-    v = x;
-    d = 1;
-    b = 0;
-
-    do {
-        while (!(u & 1)) {
-            u >>= 1;
-            if (b & 1)
-                b -= IDEA_MODULO;
-            b >>= 1;
-        }
-
-        while (!(v & 1)) {
-            v >>= 1;
-            if (d & 1) {
-                d -= IDEA_MODULO;
-            }
-            d >>= 1;
-        }
-
-        if (u >= v) {
-            u -= v;
-            b -= d;
-        } else {
-            v -= u;
-            d -= b;
-        }
-    } while (u != 0);
-
-    /* d is now the inverse, put positive value if required */
-    while (d < 0)
-        d += IDEA_MODULO;
-
-    /* d must be < IDEA_MODULO */
-    while (d >= (int)IDEA_MODULO)
-        d -= IDEA_MODULO;
-
-    return (word16)(d & IDEA_MASK);
-}
-
-/* generate the 52 16-bits key sub-blocks from the 128 key */
-int wc_IdeaSetKey(Idea *idea, const byte* key, word16 keySz,
-                  const byte *iv, int dir)
-{
-    word16  idx = 0;
-    word32  t;
-    short   i;
-
-    if (idea == NULL || key == NULL || keySz != IDEA_KEY_SIZE ||
-        (dir != IDEA_ENCRYPTION && dir != IDEA_DECRYPTION))
-        return BAD_FUNC_ARG;
-
-    /* initial key schedule for 0 -> 7 */
-    for (i = 0; i < IDEA_ROUNDS; i++) {
-        idea->skey[i]  = (word16)key[idx++] << 8;
-        idea->skey[i] |= (word16)key[idx++];
-    }
-
-    /* shift phase key schedule for 8 -> 51 */
-    for (i = IDEA_ROUNDS; i < IDEA_SK_NUM; i++) {
-        t  = (word32)idea->skey[((i+1) & 7) ? i-7 : i-15] << 9;
-        t |= (word32)idea->skey[((i+2) & 7) < 2 ? i-14 : i-6] >> 7;
-        idea->skey[i] = (word16)(t & IDEA_MASK);
-    }
-
-    /* compute decryption key from encryption key */
-    if (dir == IDEA_DECRYPTION) {
-        word16  enckey[IDEA_SK_NUM];
-
-        /* put encryption key in tmp buffer */
-        XMEMCPY(enckey, idea->skey, sizeof(idea->skey));
-
-        idx = 0;
-
-        idea->skey[6*IDEA_ROUNDS]   = idea_invmod(enckey[idx++]);
-        idea->skey[6*IDEA_ROUNDS+1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-        idea->skey[6*IDEA_ROUNDS+2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-        idea->skey[6*IDEA_ROUNDS+3] = idea_invmod(enckey[idx++]);
-
-        for (i = 6*(IDEA_ROUNDS-1); i >= 0; i -= 6) {
-            idea->skey[i+4] = enckey[idx++];
-            idea->skey[i+5] = enckey[idx++];
-
-            idea->skey[i] = idea_invmod(enckey[idx++]);
-            if (i) {
-                idea->skey[i+2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-                idea->skey[i+1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-            }
-            else {
-                idea->skey[1] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-                idea->skey[2] = (IDEA_2EXP16 - enckey[idx++]) & IDEA_MASK;
-            }
-
-            idea->skey[i+3] = idea_invmod(enckey[idx++]);
-        }
-
-        /* erase temporary buffer */
-        ForceZero(enckey, sizeof(enckey));
-    }
-
-    /* set the iv */
-    return wc_IdeaSetIV(idea, iv);
-}
-
-/* set the IV in the Idea key structure */
-int wc_IdeaSetIV(Idea *idea, const byte* iv)
-{
-    if (idea == NULL)
-        return BAD_FUNC_ARG;
-
-    if (iv != NULL)
-        XMEMCPY(idea->reg, iv, IDEA_BLOCK_SIZE);
-    else
-        XMEMSET(idea->reg, 0, IDEA_BLOCK_SIZE);
-
-    return 0;
-}
-
-/* encryption/decryption for a block (64 bits)
- */
-int wc_IdeaCipher(Idea *idea, byte* out, const byte* in)
-{
-    word32 t1, t2;
-    word16 i, skey_idx = 0, idx = 0;
-    word16 x[4];
-
-    if (idea == NULL || out == NULL || in == NULL) {
-        return BAD_FUNC_ARG;
-    }
-
-    /* put input byte block in word16 */
-    for (i = 0; i < IDEA_BLOCK_SIZE/2; i++) {
-        x[i]  = (word16)in[idx++] << 8;
-        x[i] |= (word16)in[idx++];
-    }
-
-    for (i = 0; i < IDEA_ROUNDS; i++) {
-        x[0] = idea_mult(x[0], idea->skey[skey_idx++]);
-        x[1] = ((word32)x[1] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
-        x[2] = ((word32)x[2] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
-        x[3] = idea_mult(x[3], idea->skey[skey_idx++]);
-
-        t2 = x[0] ^ x[2];
-        t2 = idea_mult((word16)t2, idea->skey[skey_idx++]);
-        t1 = (t2 + (x[1] ^ x[3])) & IDEA_MASK;
-        t1 = idea_mult((word16)t1, idea->skey[skey_idx++]);
-        t2 = (t1 + t2) & IDEA_MASK;
-
-        x[0] ^= t1;
-        x[3] ^= t2;
-
-        t2 ^= x[1];
-        x[1] = x[2] ^ (word16)t1;
-        x[2] = (word16)t2;
-    }
-
-    x[0] = idea_mult(x[0], idea->skey[skey_idx++]);
-    out[0] = (x[0] >> 8) & 0xFF;
-    out[1] = x[0] & 0xFF;
-
-    x[2] = ((word32)x[2] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
-    out[2] = (x[2] >> 8) & 0xFF;
-    out[3] = x[2] & 0xFF;
-
-    x[1] = ((word32)x[1] + (word32)idea->skey[skey_idx++]) & IDEA_MASK;
-    out[4] = (x[1] >> 8) & 0xFF;
-    out[5] = x[1] & 0xFF;
-
-    x[3] = idea_mult(x[3], idea->skey[skey_idx++]);
-    out[6] = (x[3] >> 8) & 0xFF;
-    out[7] = x[3] & 0xFF;
-
-    return 0;
-}
-
-int wc_IdeaCbcEncrypt(Idea *idea, byte* out, const byte* in, word32 len)
-{
-    int  blocks;
-    int  ret;
-
-    if (idea == NULL || out == NULL || in == NULL)
-        return BAD_FUNC_ARG;
-
-    blocks = len / IDEA_BLOCK_SIZE;
-    while (blocks--) {
-        xorbuf((byte*)idea->reg, in, IDEA_BLOCK_SIZE);
-        ret = wc_IdeaCipher(idea, (byte*)idea->reg, (byte*)idea->reg);
-        if (ret != 0) {
-            return ret;
-        }
-
-        XMEMCPY(out, idea->reg, IDEA_BLOCK_SIZE);
-
-        out += IDEA_BLOCK_SIZE;
-        in  += IDEA_BLOCK_SIZE;
-    }
-
-    return 0;
-}
-
-int wc_IdeaCbcDecrypt(Idea *idea, byte* out, const byte* in, word32 len)
-{
-    int  blocks;
-    int  ret;
-
-    if (idea == NULL || out == NULL || in == NULL)
-        return BAD_FUNC_ARG;
-
-    blocks = len / IDEA_BLOCK_SIZE;
-    while (blocks--) {
-        XMEMCPY((byte*)idea->tmp, in, IDEA_BLOCK_SIZE);
-        ret = wc_IdeaCipher(idea, out, (byte*)idea->tmp);
-        if (ret != 0) {
-            return ret;
-        }
-
-        xorbuf(out, (byte*)idea->reg, IDEA_BLOCK_SIZE);
-        XMEMCPY(idea->reg, idea->tmp, IDEA_BLOCK_SIZE);
-
-        out += IDEA_BLOCK_SIZE;
-        in  += IDEA_BLOCK_SIZE;
-    }
-
-    return 0;
-}
-
-#endif /* HAVE_IDEA */
-