This is xnu-10002.1.13. See this file in:
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#include "cc_internal.h"
#include <corecrypto/ccdigest_priv.h>

void
ccdigest_init(const struct ccdigest_info *di, ccdigest_ctx_t ctx)
{
	CC_ENSURE_DIT_ENABLED

	ccdigest_copy_state(di, ccdigest_state_ccn(di, ctx), di->initial_state);
	ccdigest_nbits(di, ctx) = 0;
	ccdigest_num(di, ctx) = 0;
}