// signed byte values.
// We compute and return both.
func (b *block) computeChecksum() (unsigned, signed int64) {
	for i, c := range b {
		if 148 <= i && i < 156 {
			c = ' ' // Treat the checksum field itself as all spaces.
		}
		unsigned += int64(c)
		signed += int64(int8(c))
	}
	return unsigned, signed
}

// reset clears the block with all zeros.

& 👥 📨 ↔ 🍕 🥙 🤝.

/// danger

🦁, 📥 👥 ❎ ↔ 📨 🔗 🤝.

✋️ 👆 🈸, 💂‍♂, 👆 🔜 ⚒ 💭 👆 🕴 🚮 ↔ 👈 👩‍💻 🤙 💪 ✔️, ⚖️ 🕐 👆 ✔️ 🔁.

///

{* ../../docs_src/security/tutorial005.py hl[156] *}

## 📣 ↔ *➡ 🛠️* & 🔗

🔜 👥 📣 👈 *➡ 🛠️* `/users/me/items/` 🚚 ↔ `items`.

👉, 👥 🗄 & ⚙️ `Security` ⚪️➡️ `fastapi`.

Pero en tu aplicación, por seguridad, deberías asegurarte de añadir solo los scopes que el usuario realmente puede tener, o los que has predefinido.

///

{* ../../docs_src/security/tutorial005_an_py310.py hl[156] *}

## Declarar scopes en *path operations* y dependencias

Ahora declaramos que la *path operation* para `/users/me/items/` requiere el scope `items`.

Para esto, importamos y usamos `Security` de `fastapi`.

pkg archive/zip, method (*Writer) RegisterCompressor(uint16, Compressor)
pkg bufio, method (*Scanner) Buffer([]uint8, int)
pkg bufio, var ErrFinalToken error
pkg crypto/tls, const TLS_RSA_WITH_AES_128_GCM_SHA256 = 156
pkg crypto/tls, const TLS_RSA_WITH_AES_128_GCM_SHA256 uint16
pkg crypto/tls, const TLS_RSA_WITH_AES_256_GCM_SHA384 = 157
pkg crypto/tls, const TLS_RSA_WITH_AES_256_GCM_SHA384 uint16

pkg syscall (freebsd-386), const DLT_USER6 = 153
pkg syscall (freebsd-386), const DLT_USER7 = 154
pkg syscall (freebsd-386), const DLT_USER8 = 155
pkg syscall (freebsd-386), const DLT_USER9 = 156
pkg syscall (freebsd-386), const DLT_WIHART = 223
pkg syscall (freebsd-386), const DLT_WIHART ideal-int
pkg syscall (freebsd-386), const DLT_X2E_SERIAL = 213
pkg syscall (freebsd-386), const DLT_X2E_XORAYA = 214

pkg syscall (freebsd-arm64), const DLT_USER7 ideal-int
pkg syscall (freebsd-arm64), const DLT_USER8 = 155
pkg syscall (freebsd-arm64), const DLT_USER8 ideal-int
pkg syscall (freebsd-arm64), const DLT_USER9 = 156
pkg syscall (freebsd-arm64), const DLT_USER9 ideal-int
pkg syscall (freebsd-arm64), const DLT_WIHART = 223
pkg syscall (freebsd-arm64), const DLT_WIHART ideal-int
pkg syscall (freebsd-arm64), const DLT_X2E_SERIAL = 213

pkg syscall (netbsd-arm64-cgo), const IFT_SONETVT ideal-int
pkg syscall (netbsd-arm64-cgo), const IFT_SRP = 151
pkg syscall (netbsd-arm64-cgo), const IFT_SRP ideal-int
pkg syscall (netbsd-arm64-cgo), const IFT_SS7SIGLINK = 156
pkg syscall (netbsd-arm64-cgo), const IFT_SS7SIGLINK ideal-int
pkg syscall (netbsd-arm64-cgo), const IFT_STACKTOSTACK = 111
pkg syscall (netbsd-arm64-cgo), const IFT_STACKTOSTACK ideal-int

XORL R12, R11 BSWAPL R11 MOVL R11, 140(SP) CMPQ R9, $0x80 JB gcmAesEncSingles SUBQ $0x80, R9 // We have at least 8 blocks to encrypt, prepare the rest of the counters MOVOU X11, 144(SP) ADDL $0x01, R10 MOVL R10, R11 XORL R12, R11 BSWAPL R11 MOVL R11, 156(SP) MOVOU X11, 160(SP) ADDL $0x01, R10 MOVL R10, R11 XORL R12, R11 BSWAPL R11 MOVL R11, 172(SP) MOVOU X11, 176(SP) ADDL $0x01, R10 MOVL R10, R11 XORL R12, R11 BSWAPL R11 MOVL R11, 188(SP) MOVOU X11, 192(SP) ADDL $0x01, R10 MOVL R10, R11 XORL R12, R11...

* Add docs for: [Additional Status Codes](https://fastapi.tiangolo.com/advanced/additional-status-codes/). PR [#156](https://github.com/tiangolo/fastapi/pull/156).

## 0.14.0