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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.
*/
#include "tomcrypt.h"
#ifdef LTC_CHACHA20POLY1305_MODE
/**
Process an entire GCM packet in one call.
@param key The secret key
@param keylen The length of the secret key
@param iv The initialization vector
@param ivlen The length of the initialization vector
@param aad The additional authentication data (header)
@param aadlen The length of the aad
@param in The plaintext
@param inlen The length of the plaintext (ciphertext length is the same)
@param out The ciphertext
@param tag [out] The MAC tag
@param taglen [in/out] The MAC tag length
@param direction Encrypt or Decrypt mode (CHACHA20POLY1305_ENCRYPT or CHACHA20POLY1305_DECRYPT)
@return CRYPT_OK on success
*/
int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
const unsigned char *iv, unsigned long ivlen,
const unsigned char *aad, unsigned long aadlen,
const unsigned char *in, unsigned long inlen,
unsigned char *out,
unsigned char *tag, unsigned long *taglen,
int direction)
{
chacha20poly1305_state st;
int err;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(iv != NULL);
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(tag != NULL);
if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK) { goto LBL_ERR; }
if (aad && aadlen > 0) {
if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK) { goto LBL_ERR; }
}
if (direction == CHACHA20POLY1305_ENCRYPT) {
if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
}
else if (direction == CHACHA20POLY1305_DECRYPT) {
if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
}
else {
err = CRYPT_INVALID_ARG;
goto LBL_ERR;
}
err = chacha20poly1305_done(&st, tag, taglen);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(&st, sizeof(chacha20poly1305_state));
#endif
return err;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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