added libtomcrypt-1.00
This commit is contained in:
Tom St Denis
committed by
Steffen Jaeckel
Steffen Jaeckel
parent
1c1822d510
commit
bfc2f5b078
@@ -0,0 +1,38 @@
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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 ctr_decrypt.c
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CTR implementation, decrypt data, Tom St Denis
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*/
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#ifdef CTR
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/**
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CTR decrypt
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@param ct Ciphertext
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@param pt [out] Plaintext
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@param len Length of ciphertext (octets)
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@param ctr CTR state
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@return CRYPT_OK if successful
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*/
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int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr)
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{
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(ctr != NULL);
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return ctr_encrypt(ct, pt, len, ctr);
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}
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#endif
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@@ -0,0 +1,78 @@
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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 ctr_encrypt.c
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CTR implementation, encrypt data, Tom St Denis
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*/
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#ifdef CTR
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/**
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CTR encrypt
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@param pt Plaintext
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@param ct [out] Ciphertext
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@param len Length of plaintext (octets)
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@param ctr CTR state
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@return CRYPT_OK if successful
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*/
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int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
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{
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int x, err;
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LTC_ARGCHK(pt != NULL);
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LTC_ARGCHK(ct != NULL);
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LTC_ARGCHK(ctr != NULL);
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if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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return err;
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}
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/* is blocklen/padlen valid? */
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if (ctr->blocklen < 0 || ctr->blocklen > (int)sizeof(ctr->ctr) ||
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ctr->padlen < 0 || ctr->padlen > (int)sizeof(ctr->pad)) {
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return CRYPT_INVALID_ARG;
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}
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while (len-- > 0) {
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/* is the pad empty? */
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if (ctr->padlen == ctr->blocklen) {
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/* increment counter */
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if (ctr->mode == 0) {
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/* little-endian */
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for (x = 0; x < ctr->blocklen; x++) {
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ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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if (ctr->ctr[x] != (unsigned char)0) {
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break;
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}
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}
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} else {
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/* big-endian */
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for (x = ctr->blocklen-1; x >= 0; x--) {
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ctr->ctr[x] = (ctr->ctr[x] + (unsigned char)1) & (unsigned char)255;
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if (ctr->ctr[x] != (unsigned char)0) {
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break;
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}
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}
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}
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/* encrypt it */
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cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
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ctr->padlen = 0;
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}
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*ct++ = *pt++ ^ ctr->pad[ctr->padlen++];
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}
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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 ctr_getiv.c
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CTR implementation, get IV, Tom St Denis
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*/
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#ifdef CTR
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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 ctr The CTR state
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@return CRYPT_OK if successful
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*/
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int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
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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(ctr != NULL);
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if ((unsigned long)ctr->blocklen > *len) {
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return CRYPT_BUFFER_OVERFLOW;
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}
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XMEMCPY(IV, ctr->ctr, ctr->blocklen);
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*len = ctr->blocklen;
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,54 @@
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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 ctr_setiv.c
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CTR implementation, set IV, Tom St Denis
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*/
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#ifdef CTR
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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 ctr The CTR state
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@return CRYPT_OK if successful
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*/
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int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
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{
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int err;
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(ctr != NULL);
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/* bad param? */
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if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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return err;
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}
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if (len != (unsigned long)ctr->blocklen) {
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return CRYPT_INVALID_ARG;
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}
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/* set IV */
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XMEMCPY(ctr->ctr, IV, len);
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/* force next block */
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ctr->padlen = 0;
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cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
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return CRYPT_OK;
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}
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#endif
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@@ -0,0 +1,62 @@
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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 ctr_start.c
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CTR implementation, start chain, Tom St Denis
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*/
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#ifdef CTR
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/**
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Initialize a CTR context
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@param cipher The index of the cipher desired
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@param count 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 ctr The CTR state to initialize
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@return CRYPT_OK if successful
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*/
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int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen,
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int num_rounds, symmetric_CTR *ctr)
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{
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int x, err;
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LTC_ARGCHK(count != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ctr != 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, &ctr->key)) != CRYPT_OK) {
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return err;
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}
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/* copy ctr */
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ctr->blocklen = cipher_descriptor[cipher].block_length;
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ctr->cipher = cipher;
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ctr->padlen = 0;
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ctr->mode = 0;
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for (x = 0; x < ctr->blocklen; x++) {
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ctr->ctr[x] = count[x];
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}
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cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
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return CRYPT_OK;
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}
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#endif
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