39 lines
1.0 KiB
C
39 lines
1.0 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/* The implementation is based on:
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* "Salsa20 specification", http://cr.yp.to/snuffle/spec.pdf
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* and salsa20-ref.c version 20051118
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* Public domain from D. J. Bernstein
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*/
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#include "tomcrypt_private.h"
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#ifdef LTC_SALSA20
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/**
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Set IV + counter data to the Salsa20 state
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@param st The Salsa20 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 8)
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@param counter 64bit (unsigned) initial counter value
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@return CRYPT_OK on success
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*/
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int salsa20_ivctr64(salsa20_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 counter)
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{
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LTC_ARGCHK(st != NULL);
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LTC_ARGCHK(iv != NULL);
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/* Salsa20: 64-bit IV (nonce) + 64-bit counter */
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LTC_ARGCHK(ivlen == 8);
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LOAD32L(st->input[6], iv + 0);
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LOAD32L(st->input[7], iv + 4);
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st->input[8] = (ulong32)(counter & 0xFFFFFFFF);
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st->input[9] = (ulong32)(counter >> 32);
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st->ksleft = 0;
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st->ivlen = ivlen;
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return CRYPT_OK;
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}
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#endif
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