TeaSpeak/tomcrypt
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Merge branch 'pascal-brand-st/xts' into develop

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This closes #52
This commit is contained in:
Steffen Jaeckel 2014-09-29 19:47:44 +02:00
commit 5ce0c7f70e
4 changed files with 105 additions and 36 deletions
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4
src/headers/tomcrypt_cipher.h
View File

@ -884,12 +884,12 @@ int xts_start( int cipher,
int xts_encrypt(
const unsigned char *pt, unsigned long ptlen,
unsigned char *ct,
const unsigned char *tweak,
unsigned char *tweak,
symmetric_xts *xts);
int xts_decrypt(
const unsigned char *ct, unsigned long ptlen,
unsigned char *pt,
const unsigned char *tweak,
unsigned char *tweak,
symmetric_xts *xts);
void xts_done(symmetric_xts *xts);

7
src/modes/xts/xts_decrypt.c
View File

@ -60,7 +60,7 @@ static int tweak_uncrypt(const unsigned char *C, unsigned char *P, unsigned char
*/int xts_decrypt(
const unsigned char *ct, unsigned long ptlen,
unsigned char *pt,
const unsigned char *tweak,
unsigned char *tweak,
symmetric_xts *xts)
{
unsigned char PP[16], CC[16], T[16];
@ -130,6 +130,11 @@ static int tweak_uncrypt(const unsigned char *C, unsigned char *P, unsigned char
}
}
/* Decrypt the tweak back */
if ((err = cipher_descriptor[xts->cipher].ecb_decrypt(T, tweak, &xts->key2)) != CRYPT_OK) {
return err;
}
return CRYPT_OK;
}

7
src/modes/xts/xts_encrypt.c
View File

@ -63,7 +63,7 @@ static int tweak_crypt(const unsigned char *P, unsigned char *C, unsigned char *
int xts_encrypt(
const unsigned char *pt, unsigned long ptlen,
unsigned char *ct,
const unsigned char *tweak,
unsigned char *tweak,
symmetric_xts *xts)
{
unsigned char PP[16], CC[16], T[16];
@ -131,6 +131,11 @@ int xts_encrypt(
}
}
/* Decrypt the tweak back */
if ((err = cipher_descriptor[xts->cipher].ecb_decrypt(T, tweak, &xts->key2)) != CRYPT_OK) {
return err;
}
return err;
}

117
src/modes/xts/xts_test.c
View File

@ -12,6 +12,10 @@
#ifdef LTC_XTS_MODE
#if defined(LTC_XTS_TEST_DBG) && !defined(LTC_NO_TEST)
void print_hex(const char* what, const unsigned char* p, const unsigned long l);
#endif
/**
Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
Returns CRYPT_OK upon success.
@ -142,10 +146,11 @@ int xts_test(void)
},
};
unsigned char OUT[512], T[16];
unsigned char OUT[512], Torg[16], T[16];
ulong64 seq;
symmetric_xts xts;
int i, err, idx;
int i, j, err, idx;
unsigned long len;
/* AES can be under rijndael or aes... try to find it */
if ((idx = find_cipher("aes")) == -1) {
@ -154,38 +159,92 @@ int xts_test(void)
}
}
for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
err = xts_start(idx, tests[i].key1, tests[i].key2, tests[i].keylen/2, 0, &xts);
if (err != CRYPT_OK) {
return err;
}
for (j = 0; j < 2; j++) {
for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
/* skip the cases where
* the length is smaller than 2*blocklen
* or the length is not a multiple of 32
*/
if ((j == 1) && ((tests[i].PTLEN < 32) || (tests[i].PTLEN % 32))) {
continue;
}
len = tests[i].PTLEN/2;
seq = tests[i].seqnum;
STORE64L(seq,T);
XMEMSET(T+8, 0, 8);
err = xts_start(idx, tests[i].key1, tests[i].key2, tests[i].keylen/2, 0, &xts);
if (err != CRYPT_OK) {
return err;
}
err = xts_encrypt(tests[i].PTX, tests[i].PTLEN, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
seq = tests[i].seqnum;
STORE64L(seq,Torg);
XMEMSET(Torg+8, 0, 8);
if (XMEMCMP(OUT, tests[i].CTX, tests[i].PTLEN)) {
xts_done(&xts);
return CRYPT_FAIL_TESTVECTOR;
}
XMEMCPY(T, Torg, sizeof(T));
if (j == 0) {
err = xts_encrypt(tests[i].PTX, tests[i].PTLEN, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
}
else {
#ifdef LTC_XTS_TEST_DBG
printf("\nTestcase #%d with original length %lu and half of it %lu\n", i, tests[i].PTLEN, len);
#endif
err = xts_encrypt(tests[i].PTX, len, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
err = xts_encrypt(&tests[i].PTX[len], len, &OUT[len], T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
}
err = xts_decrypt(tests[i].CTX, tests[i].PTLEN, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
if (XMEMCMP(OUT, tests[i].CTX, tests[i].PTLEN)) {
#ifdef LTC_XTS_TEST_DBG
printf("\nencrypt\n");
print_hex("should", tests[i].CTX, tests[i].PTLEN);
print_hex("is", OUT, tests[i].PTLEN);
#endif
xts_done(&xts);
return CRYPT_FAIL_TESTVECTOR;
}
if (XMEMCMP(OUT, tests[i].PTX, tests[i].PTLEN)) {
xts_done(&xts);
return CRYPT_FAIL_TESTVECTOR;
}
xts_done(&xts);
XMEMCPY(T, Torg, sizeof(T));
if (j == 0) {
err = xts_decrypt(tests[i].CTX, tests[i].PTLEN, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
}
else {
err = xts_decrypt(tests[i].CTX, len, OUT, T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
err = xts_decrypt(&tests[i].CTX[len], len, &OUT[len], T, &xts);
if (err != CRYPT_OK) {
xts_done(&xts);
return err;
}
}
if (XMEMCMP(OUT, tests[i].PTX, tests[i].PTLEN)) {
#ifdef LTC_XTS_TEST_DBG
printf("\ndecrypt\n");
print_hex("should", tests[i].PTX, tests[i].PTLEN);
print_hex("is", OUT, tests[i].PTLEN);
#endif
xts_done(&xts);
return CRYPT_FAIL_TESTVECTOR;
}
xts_done(&xts);
}
}
return CRYPT_OK;
#endif