35 lines
877 B
C
35 lines
877 B
C
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/* 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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/* The implementation is based on:
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* chacha-ref.c version 20080118
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* Public domain from D. J. Bernstein
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*/
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#include "tomcrypt.h"
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#ifdef LTC_CHACHA
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/**
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Generate a stream of random bytes via ChaCha
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@param st The ChaCha20 state
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@param out [out] The output buffer
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@param outlen The output length
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@return CRYPT_OK on success
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*/
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int chacha_keystream(chacha_state *st, unsigned char *out, unsigned long outlen)
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{
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if (outlen == 0) return CRYPT_OK; /* nothing to do */
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LTC_ARGCHK(out != NULL);
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XMEMSET(out, 0, outlen);
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return chacha_crypt(st, out, outlen, out);
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}
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#endif
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