void cf_cmac_stream_update(cf_cmac_stream *ctx, const uint8_t *data, size_t len, int isfinal)
{
size_t blocksz = ctx->cmac.prp->blocksz;
cf_blockwise_in_fn final_fn = cmac_process;
int needpad = 0;
if (isfinal)
{
assert(!ctx->finalised);
ctx->finalised = 1;
/* If we have a whole number of blocks, and at least 1 block, we XOR in B.
* Otherwise, we need to pad and XOR in P. */
if (((len + ctx->used) & 0xf) == 0 &&
!(len == 0 && ctx->used == 0 && ctx->processed == 0))
final_fn = cmac_process_final_nopad;
else
needpad = 1;
}
/* Input data */
cf_blockwise_accumulate_final(ctx->buffer, &ctx->used, blocksz,
data, len,
cmac_process,
final_fn, ctx);
/* Input padding */
if (needpad)
{
cf_blockwise_acc_pad(ctx->buffer, &ctx->used, blocksz,
0x80, 0x00, 0x00, blocksz - ctx->used,
cmac_process_final_pad, ctx);
}
}
void cf_blockwise_accumulate(uint8_t *partial, size_t *npartial, size_t nblock,
const void *inp, size_t nbytes,
cf_blockwise_in_fn process,
void *ctx)
{
cf_blockwise_accumulate_final(partial, npartial, nblock,
inp, nbytes,
process, process, ctx);
}
