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* This file contains Original Code and/or Modifications of Original Code
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#include <corecrypto/ccdigest_priv.h>
#include <corecrypto/cc_priv.h>
#include "ccdigest_internal.h"
/* This can be used for SHA1, SHA256 and SHA224 */
void
ccdigest_final_64be(const struct ccdigest_info *di, ccdigest_ctx_t ctx, unsigned char *digest)
{
// Sanity check to recover from ctx corruptions.
if (ccdigest_num(di, ctx) >= di->block_size) {
ccdigest_num(di, ctx) = 0;
}
// Clone the state.
ccdigest_di_decl(di, tmp);
cc_memcpy(tmp, ctx, ccdigest_di_size(di));
ccdigest_nbits(di, tmp) += ccdigest_num(di, tmp) * 8;
ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0x80;
/* If we don't have at least 8 bytes (for the length) left we need to add
* a second block. */
if (ccdigest_num(di, tmp) > 64 - 8) {
while (ccdigest_num(di, tmp) < 64) {
ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
}
di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
ccdigest_num(di, tmp) = 0;
}
/* pad upto block_size minus 8 with 0s */
while (ccdigest_num(di, tmp) < 64 - 8) {
ccdigest_data(di, tmp)[ccdigest_num(di, tmp)++] = 0;
}
cc_store64_be(ccdigest_nbits(di, tmp), ccdigest_data(di, tmp) + 64 - 8);
di->compress(ccdigest_state(di, tmp), 1, ccdigest_data(di, tmp));
/* copy output */
for (unsigned int i = 0; i < di->output_size / 4; i++) {
cc_store32_be(ccdigest_state_u32(di, tmp)[i], digest + (4 * i));
}
ccdigest_di_clear(di, tmp);
}