added libtomcrypt-1.00
This commit is contained in:
Tom St Denis
committed by
Steffen Jaeckel
Steffen Jaeckel
parent
1c1822d510
commit
bfc2f5b078
@@ -0,0 +1,69 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cbc_decrypt.c
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CBC implementation, decrypt block, Tom St Denis
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*/
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#ifdef CBC
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/**
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CBC decrypt
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@param ct Ciphertext
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@param pt [out] Plaintext
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@param cbc CBC state
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@return CRYPT_OK if successful
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*/
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int cbc_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_CBC *cbc)
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{
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int x, err;
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unsigned char tmp[MAXBLOCKSIZE], tmp2[MAXBLOCKSIZE];
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(cbc != NULL);
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/* decrypt the block from ct into tmp */
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if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
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return err;
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}
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LTC_ARGCHK(cipher_descriptor[cbc->cipher].ecb_decrypt != NULL);
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/* is blocklen valid? */
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if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) {
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return CRYPT_INVALID_ARG;
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}
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/* decrypt and xor IV against the plaintext of the previous step */
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cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key);
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for (x = 0; x < cbc->blocklen; x++) {
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/* copy CT in case ct == pt */
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tmp2[x] = ct[x];
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/* actually decrypt the byte */
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pt[x] = tmp[x] ^ cbc->IV[x];
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}
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/* replace IV with this current ciphertext */
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for (x = 0; x < cbc->blocklen; x++) {
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cbc->IV[x] = tmp2[x];
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}
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#ifdef LTC_CLEAN_STACK
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zeromem(tmp, sizeof(tmp));
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zeromem(tmp2, sizeof(tmp2));
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#endif
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,65 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cbc_encrypt.c
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CBC implementation, encrypt block, Tom St Denis
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*/
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#ifdef CBC
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/**
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CBC encrypt
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@param pt Plaintext
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@param ct [out] Ciphertext
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@param cbc CBC state
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@return CRYPT_OK if successful
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*/
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int cbc_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_CBC *cbc)
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{
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int x, err;
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unsigned char tmp[MAXBLOCKSIZE];
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(cbc != NULL);
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if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
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return err;
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}
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/* is blocklen valid? */
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if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) {
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return CRYPT_INVALID_ARG;
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}
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/* xor IV against plaintext */
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for (x = 0; x < cbc->blocklen; x++) {
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tmp[x] = pt[x] ^ cbc->IV[x];
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}
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/* encrypt */
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cipher_descriptor[cbc->cipher].ecb_encrypt(tmp, ct, &cbc->key);
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/* store IV [ciphertext] for a future block */
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for (x = 0; x < cbc->blocklen; x++) {
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cbc->IV[x] = ct[x];
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}
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#ifdef LTC_CLEAN_STACK
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zeromem(tmp, sizeof(tmp));
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#endif
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,41 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cbc_getiv.c
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CBC implementation, get IV, Tom St Denis
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*/
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#ifdef CBC
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/**
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Get the current initial vector
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@param IV [out] The destination of the initial vector
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@param len [in/out] The max size and resulting size of the initial vector
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@param cbc The CBC state
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@return CRYPT_OK if successful
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*/
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int cbc_getiv(unsigned char *IV, unsigned long *len, symmetric_CBC *cbc)
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{
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(len != NULL);
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LTC_ARGCHK(cbc != NULL);
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if ((unsigned long)cbc->blocklen > *len) {
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return CRYPT_BUFFER_OVERFLOW;
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}
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XMEMCPY(IV, cbc->IV, cbc->blocklen);
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*len = cbc->blocklen;
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,40 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cbc_setiv.c
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CBC implementation, set IV, Tom St Denis
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*/
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#ifdef CBC
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/**
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Set an initial vector
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@param IV The initial vector
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@param len The length of the vector (in octets)
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@param cbc The CBC state
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@return CRYPT_OK if successful
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*/
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int cbc_setiv(const unsigned char *IV, unsigned long len, symmetric_CBC *cbc)
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{
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(cbc != NULL);
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if (len != (unsigned long)cbc->blocklen) {
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return CRYPT_INVALID_ARG;
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}
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XMEMCPY(cbc->IV, IV, len);
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,58 @@
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cbc_start.c
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CBC implementation, start chain, Tom St Denis
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*/
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#ifdef CBC
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/**
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Initialize a CBC context
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@param cipher The index of the cipher desired
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@param IV The initial vector
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@param key The secret key
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@param keylen The length of the secret key (octets)
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@param num_rounds Number of rounds in the cipher desired (0 for default)
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@param cbc The CBC state to initialize
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@return CRYPT_OK if successful
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*/
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int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_CBC *cbc)
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{
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int x, err;
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(cbc != NULL);
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/* bad param? */
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if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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return err;
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}
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/* setup cipher */
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if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) {
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return err;
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}
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/* copy IV */
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cbc->blocklen = cipher_descriptor[cipher].block_length;
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cbc->cipher = cipher;
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for (x = 0; x < cbc->blocklen; x++) {
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cbc->IV[x] = IV[x];
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}
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return CRYPT_OK;
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}
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#endif
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