Decrypt a message with a specified 96‐bit nonce and aad. Returns true if valid.

Synopsis

Declared in <crypto/chacha20poly1305.h>

bool
Decrypt(
    std::span<std::byte const> cipher,
    std::span<std::byte const> aad,
    Nonce96 nonce,
    std::span<std::byte> plain) noexcept;

Description

Requires cipher.size() = plain.size() + EXPANSION.

Return Value

true if the tag is valid and decryption succeeded, false otherwise.

Parameters

Name

Description

cipher

The ciphertext and authentication tag to decrypt and verify.

aad

The associated data to authenticate.

nonce

The 96‐bit nonce.

plain

Output buffer receiving the recovered plaintext.

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