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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* 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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#include "tomcrypt.h"
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#ifdef LTC_CHACHA20POLY1305_MODE
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/**
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Set IV + counter data (with RFC7905-magic) to the ChaCha20Poly1305 state and reset the context
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@param st The ChaCha20Poly1305 state
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@param iv The IV data to add
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@param ivlen The length of the IV (must be 12 or 8)
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@param sequence_number 64bit sequence number which is incorporated into IV as described in RFC7905
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@return CRYPT_OK on success
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*/
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int chacha20poly1305_setiv_rfc7905(chacha20poly1305_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 sequence_number)
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{
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int i;
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unsigned char combined_iv[12] = { 0 };
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LTC_ARGCHK(st != NULL);
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LTC_ARGCHK(iv != NULL);
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LTC_ARGCHK(ivlen == 12);
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STORE64L(sequence_number, combined_iv + 4);
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for (i = 0; i < 12; i++) combined_iv[i] = iv[i] ^ combined_iv[i];
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return chacha20poly1305_setiv(st, combined_iv, 12);
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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