memset(block, 'a', nessie_hash_ctx.blocksize_B);
nessie_hash_ctx.hash_init(ctx);
while(n>=nessie_hash_ctx.blocksize_B){
nessie_hash_ctx.hash_next(block, ctx);
n -= nessie_hash_ctx.blocksize_B;
memset(block, 'a', nessie_hash_ctx.blocksize_B);
nessie_hash_ctx.hash_init(ctx);
while(n>=nessie_hash_ctx.blocksize_B){
nessie_hash_ctx.hash_next(block, ctx);
n -= nessie_hash_ctx.blocksize_B;