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Import code from previous AssetBuilder version

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Jan
2019-09-24 10:45:09 +02:00
parent 5609557516
commit 0d8432d4f7
919 changed files with 154412 additions and 26 deletions
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106
thirdparty/libtomcrypt/encauth/ocb3/ocb3_add_aad.c vendored Normal file
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
/**
@file ocb3_add_aad.c
OCB implementation, add AAD data, by Karel Miko
*/
#include "tomcrypt.h"
#ifdef LTC_OCB3_MODE
/**
Add one block of AAD data (internal function)
@param ocb The OCB state
@param aad_block [in] AAD data (block_len size)
@return CRYPT_OK if successful
*/
static int _ocb3_int_aad_add_block(ocb3_state *ocb, const unsigned char *aad_block)
{
unsigned char tmp[MAXBLOCKSIZE];
int err;
/* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
ocb3_int_xor_blocks(ocb->aOffset_current, ocb->aOffset_current, ocb->L_[ocb3_int_ntz(ocb->ablock_index)], ocb->block_len);
/* Sum_i = Sum_{i-1} xor ENCIPHER(K, A_i xor Offset_i) */
ocb3_int_xor_blocks(tmp, aad_block, ocb->aOffset_current, ocb->block_len);
if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
return err;
}
ocb3_int_xor_blocks(ocb->aSum_current, ocb->aSum_current, tmp, ocb->block_len);
ocb->ablock_index++;
return CRYPT_OK;
}
/**
Add AAD - additional associated data
@param ocb The OCB state
@param aad The AAD data
@param aadlen The size of AAD data (octets)
@return CRYPT_OK if successful
*/
int ocb3_add_aad(ocb3_state *ocb, const unsigned char *aad, unsigned long aadlen)
{
int err, x, full_blocks, full_blocks_len, last_block_len;
unsigned char *data;
unsigned long datalen, l;
LTC_ARGCHK(ocb != NULL);
if (aadlen == 0) return CRYPT_OK;
LTC_ARGCHK(aad != NULL);
if (ocb->adata_buffer_bytes > 0) {
l = ocb->block_len - ocb->adata_buffer_bytes;
if (l > aadlen) l = aadlen;
XMEMCPY(ocb->adata_buffer+ocb->adata_buffer_bytes, aad, l);
ocb->adata_buffer_bytes += l;
if (ocb->adata_buffer_bytes == ocb->block_len) {
if ((err = _ocb3_int_aad_add_block(ocb, ocb->adata_buffer)) != CRYPT_OK) {
return err;
}
ocb->adata_buffer_bytes = 0;
}
data = (unsigned char *)aad + l;
datalen = aadlen - l;
}
else {
data = (unsigned char *)aad;
datalen = aadlen;
}
if (datalen == 0) return CRYPT_OK;
full_blocks = datalen/ocb->block_len;
full_blocks_len = full_blocks * ocb->block_len;
last_block_len = datalen - full_blocks_len;
for (x=0; x<full_blocks; x++) {
if ((err = _ocb3_int_aad_add_block(ocb, data+x*ocb->block_len)) != CRYPT_OK) {
return err;
}
}
if (last_block_len>0) {
XMEMCPY(ocb->adata_buffer, data+full_blocks_len, last_block_len);
ocb->adata_buffer_bytes = last_block_len;
}
return CRYPT_OK;
}
#endif
/* ref: HEAD -> master, tag: v1.18.2 */
/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
/* commit time: 2018-07-01 22:49:01 +0200 */