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* This file contains Original Code and/or Modifications of Original Code
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#include "cc_internal.h"
#include <corecrypto/ccdigest.h>
#include <corecrypto/cc_priv.h>
void
ccdigest_update(const struct ccdigest_info *di, ccdigest_ctx_t ctx, size_t len, const void *data)
{
CC_ENSURE_DIT_ENABLED
const char * data_ptr = data;
size_t nblocks, nbytes;
// Sanity check to recover from ctx corruptions.
if (ccdigest_num(di, ctx) >= di->block_size) {
ccdigest_num(di, ctx) = 0;
}
while (len > 0) {
if (ccdigest_num(di, ctx) == 0 && len > di->block_size) {
if (di->block_size == 1 << 6) { // md5 & sha1 & sha256
nblocks = len >> 6;
nbytes = nblocks << 6;
} else if (di->block_size == 1 << 7) { // sha384 & sha512
nblocks = len >> 7;
nbytes = nblocks << 7;
} else {
nblocks = len / di->block_size;
nbytes = nblocks * di->block_size;
}
di->compress(ccdigest_state(di, ctx), nblocks, data_ptr);
len -= nbytes;
data_ptr += nbytes;
ccdigest_nbits(di, ctx) += (uint64_t) (nbytes) * 8;
} else {
size_t n = CC_MIN(di->block_size - ccdigest_num(di, ctx), len);
cc_memcpy(ccdigest_data(di, ctx) + ccdigest_num(di, ctx), data_ptr, n);
/* typecast: less than block size, will always fit into an int */
ccdigest_num(di, ctx) += (unsigned int)n;
len -= n;
data_ptr += n;
if (ccdigest_num(di, ctx) == di->block_size) {
di->compress(ccdigest_state(di, ctx), 1, ccdigest_data(di, ctx));
ccdigest_nbits(di, ctx) += ccdigest_num(di, ctx) * 8;
ccdigest_num(di, ctx) = 0;
}
}
}
}