Replaced system SQLite with SQLCipher to support encrypted database
This commit is contained in:
Oleksii Zghurskyi
258
Sources/DataLiteC/libtomcrypt/ciphers/idea.c
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258
Sources/DataLiteC/libtomcrypt/ciphers/idea.c
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/* Based on idea.cpp - originally written and placed in the public domain by Wei Dai
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https://github.com/weidai11/cryptopp/blob/master/idea.cpp
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Patents should be expired. On 2017-10-16 wikipedia says:
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https://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm
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A patent application for IDEA was first filed in Switzerland (CH A 1690/90) on May 18, 1990,
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then an international patent application was filed under the Patent Cooperation Treaty on
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May 16, 1991. Patents were eventually granted in Austria, France, Germany, Italy, the Netherlands,
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Spain, Sweden, Switzerland, the United Kingdom, (European Patent Register entry for European
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patent no. 0482154, filed May 16, 1991, issued June 22, 1994 and expired May 16, 2011),
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the United States (U.S. Patent 5,214,703, issued May 25, 1993 and expired January 7, 2012)
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and Japan (JP 3225440) (expired May 16, 2011).
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*/
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#include "tomcrypt_private.h"
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#ifdef LTC_IDEA
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const struct ltc_cipher_descriptor idea_desc = {
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"idea",
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24, /* cipher_ID */
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16, 16, 8, 8, /* min_key_len, max_key_len, block_len, default_rounds */
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&idea_setup,
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&idea_ecb_encrypt,
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&idea_ecb_decrypt,
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&idea_test,
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&idea_done,
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&idea_keysize,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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typedef unsigned short int ushort16;
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#define LOW16(x) ((x)&0xffff) /* compiler should be able to optimize this away if x is 16 bits */
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#define HIGH16(x) ((x)>>16)
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#define MUL(a,b) { \
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ulong32 p = (ulong32)LOW16(a) * b; \
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if (p) { \
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p = LOW16(p) - HIGH16(p); \
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a = (ushort16)p - (ushort16)HIGH16(p); \
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} \
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else \
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a = 1 - a - b; \
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}
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#define STORE16(x,y) { (y)[0] = (unsigned char)(((x)>>8)&255); (y)[1] = (unsigned char)((x)&255); }
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#define LOAD16(x,y) { x = ((ushort16)((y)[0] & 255)<<8) | ((ushort16)((y)[1] & 255)); }
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static ushort16 s_mul_inv(ushort16 x)
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{
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ushort16 y = x;
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unsigned i;
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for (i = 0; i < 15; i++) {
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MUL(y, LOW16(y));
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MUL(y, x);
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}
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return LOW16(y);
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}
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static ushort16 s_add_inv(ushort16 x)
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{
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return LOW16(0 - x);
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}
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#define s_setup_key s_idea_setup_key
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static int s_setup_key(const unsigned char *key, symmetric_key *skey)
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{
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int i, j;
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ushort16 *e_key = skey->idea.ek;
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ushort16 *d_key = skey->idea.dk;
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/* prepare enc key */
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for (i = 0; i < 8; i++) {
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LOAD16(e_key[i], key + 2 * i);
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}
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for (; i < LTC_IDEA_KEYLEN; i++) {
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j = (i - i % 8) - 8;
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e_key[i] = LOW16((e_key[j+(i+1)%8] << 9) | (e_key[j+(i+2)%8] >> 7));
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}
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/* prepare dec key */
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for (i = 0; i < LTC_IDEA_ROUNDS; i++) {
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d_key[i*6+0] = s_mul_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+0]);
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d_key[i*6+1] = s_add_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+1+(i>0 ? 1 : 0)]);
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d_key[i*6+2] = s_add_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+2-(i>0 ? 1 : 0)]);
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d_key[i*6+3] = s_mul_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+3]);
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d_key[i*6+4] = e_key[(LTC_IDEA_ROUNDS-1-i)*6+4];
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d_key[i*6+5] = e_key[(LTC_IDEA_ROUNDS-1-i)*6+5];
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}
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d_key[i*6+0] = s_mul_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+0]);
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d_key[i*6+1] = s_add_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+1]);
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d_key[i*6+2] = s_add_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+2]);
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d_key[i*6+3] = s_mul_inv(e_key[(LTC_IDEA_ROUNDS-i)*6+3]);
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return CRYPT_OK;
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}
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static int s_process_block(const unsigned char *in, unsigned char *out, const ushort16 *m_key)
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{
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int i;
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ushort16 x0, x1, x2, x3, t0, t1;
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LOAD16(x0, in + 0);
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LOAD16(x1, in + 2);
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LOAD16(x2, in + 4);
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LOAD16(x3, in + 6);
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for (i = 0; i < LTC_IDEA_ROUNDS; i++) {
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MUL(x0, m_key[i*6+0]);
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x1 += m_key[i*6+1];
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x2 += m_key[i*6+2];
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MUL(x3, m_key[i*6+3]);
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t0 = x0^x2;
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MUL(t0, m_key[i*6+4]);
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t1 = t0 + (x1^x3);
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MUL(t1, m_key[i*6+5]);
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t0 += t1;
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x0 ^= t1;
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x3 ^= t0;
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t0 ^= x1;
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x1 = x2^t1;
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x2 = t0;
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}
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MUL(x0, m_key[LTC_IDEA_ROUNDS*6+0]);
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x2 += m_key[LTC_IDEA_ROUNDS*6+1];
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x1 += m_key[LTC_IDEA_ROUNDS*6+2];
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MUL(x3, m_key[LTC_IDEA_ROUNDS*6+3]);
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STORE16(x0, out + 0);
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STORE16(x2, out + 2);
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STORE16(x1, out + 4);
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STORE16(x3, out + 6);
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return CRYPT_OK;
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}
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int idea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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{
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(skey != NULL);
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if (num_rounds != 0 && num_rounds != 8) return CRYPT_INVALID_ROUNDS;
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if (keylen != 16) return CRYPT_INVALID_KEYSIZE;
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return s_setup_key(key, skey);
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}
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int idea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
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{
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int err = s_process_block(pt, ct, skey->idea.ek);
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#ifdef LTC_CLEAN_STACK
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burn_stack(sizeof(ushort16) * 6 + sizeof(int));
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#endif
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return err;
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}
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int idea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
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{
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int err = s_process_block(ct, pt, skey->idea.dk);
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#ifdef LTC_CLEAN_STACK
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burn_stack(sizeof(ushort16) * 6 + sizeof(int));
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#endif
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return err;
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}
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void idea_done(symmetric_key *skey)
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{
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LTC_UNUSED_PARAM(skey);
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}
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int idea_keysize(int *keysize)
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{
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LTC_ARGCHK(keysize != NULL);
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if (*keysize < 16) {
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return CRYPT_INVALID_KEYSIZE;
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}
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*keysize = 16;
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return CRYPT_OK;
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}
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int idea_test(void)
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{
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#ifndef LTC_TEST
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return CRYPT_NOP;
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#else
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static const struct {
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unsigned char key[16], pt[8], ct[8];
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} tests[] = {
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{
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/* key */ { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* pt */ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* ct */ { 0xB1, 0xF5, 0xF7, 0xF8, 0x79, 0x01, 0x37, 0x0F }
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},
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{
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/* key */ { 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* pt */ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* ct */ { 0xB3, 0x92, 0x7D, 0xFF, 0xB6, 0x35, 0x86, 0x26 }
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},
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{
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/* key */ { 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* pt */ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* ct */ { 0xE9, 0x87, 0xE0, 0x02, 0x9F, 0xB9, 0x97, 0x85 }
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},
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{
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/* key */ { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* pt */ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* ct */ { 0x75, 0x4A, 0x03, 0xCE, 0x08, 0xDB, 0x7D, 0xAA }
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},
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{
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/* key */ { 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* pt */ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
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/* ct */ { 0xF0, 0x15, 0xF9, 0xFB, 0x0C, 0xFC, 0x7E, 0x1C }
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},
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};
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unsigned char buf[2][8];
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symmetric_key key;
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int err, x;
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if (sizeof(ushort16) != 2) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
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if ((err = idea_setup(tests[x].key, 16, 8, &key)) != CRYPT_OK) {
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return err;
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}
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if ((err = idea_ecb_encrypt(tests[x].pt, buf[0], &key)) != CRYPT_OK) {
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return err;
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}
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if (compare_testvector(buf[0], 8, tests[x].ct, 8, "IDEA Encrypt", x)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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if ((err = idea_ecb_decrypt(tests[x].ct, buf[1], &key)) != CRYPT_OK) {
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return err;
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}
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if (compare_testvector(buf[1], 8, tests[x].pt, 8, "IDEA Decrypt", x)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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}
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return CRYPT_OK;
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#endif
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}
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#undef LOW16
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#undef HIGH16
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#undef MUL
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#undef STORE16
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#undef LOAD16
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#undef s_setup_key
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#endif
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