| // SPDX-License-Identifier: BSD-2-Clause |
| /* 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_private.h" |
| |
| #ifdef LTC_CHACHA |
| |
| /** |
| Encrypt (or decrypt) bytes of ciphertext (or plaintext) with ChaCha |
| @param key The key |
| @param keylen The key length |
| @param iv The initial vector |
| @param ivlen The initial vector length |
| @param datain The plaintext (or ciphertext) |
| @param datalen The length of the input and output (octets) |
| @param rounds The number of rounds |
| @param dataout [out] The ciphertext (or plaintext) |
| @return CRYPT_OK if successful |
| */ |
| int chacha_memory(const unsigned char *key, unsigned long keylen, unsigned long rounds, |
| const unsigned char *iv, unsigned long ivlen, ulong64 counter, |
| const unsigned char *datain, unsigned long datalen, unsigned char *dataout) |
| { |
| chacha_state st; |
| int err; |
| |
| LTC_ARGCHK(ivlen <= 8 || counter < 4294967296); /* 2**32 */ |
| |
| if ((err = chacha_setup(&st, key, keylen, rounds)) != CRYPT_OK) goto WIPE_KEY; |
| if (ivlen > 8) { |
| if ((err = chacha_ivctr32(&st, iv, ivlen, counter)) != CRYPT_OK) goto WIPE_KEY; |
| } else { |
| if ((err = chacha_ivctr64(&st, iv, ivlen, counter)) != CRYPT_OK) goto WIPE_KEY; |
| } |
| err = chacha_crypt(&st, datain, datalen, dataout); |
| WIPE_KEY: |
| chacha_done(&st); |
| return err; |
| } |
| |
| #endif /* LTC_CHACHA */ |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |