md4_process
ret = md4_process(ctx, ctx->md4_buffer); EG(ret, err);
ret = md4_process(ctx, data_ptr); EG(ret, err);
ret = md4_process(ctx, last_padded_block); EG(ret, err);
ret = md4_process(ctx, last_padded_block + MD4_BLOCK_SIZE); EG(ret, err);
ret = md4_process(ctx, last_padded_block); EG(ret, err);