sshbuf_peek_u32
ASSERT_INT_EQ(sshbuf_peek_u32(p1, 0, &v32), 0);
ASSERT_INT_EQ(sshbuf_peek_u32(p1, 6, &v32), 0);
ASSERT_INT_EQ(sshbuf_peek_u32(p1, 7, &v32), SSH_ERR_MESSAGE_INCOMPLETE);
ASSERT_INT_EQ(sshbuf_peek_u32(p1, sizeof(x), &v32),
ASSERT_INT_EQ(sshbuf_peek_u32(p1, 1000, &v32),
int sshbuf_peek_u32(const struct sshbuf *buf, size_t offset,