Functions for the core crypto.
| Nonce | Nonce for asymmetric authenticated encryption
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| PrecomputedKey | Applications that send several messages to the same receiver can gain speed by
splitting seal() into two steps, precompute() and seal_precomputed().
Similarly, applications that receive several messages from the same sender can gain
speed by splitting open() into two steps, precompute() and open_precomputed().
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| PublicKey | PublicKey for asymmetric authenticated encryption
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| SecretKey | SecretKey for asymmetric authenticated encryption
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| Seed | Seed that can be used for keypair generation
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| Tag | Authentication Tag for the detached encryption mode
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| MACBYTES | Number of bytes in the authenticator tag of an encrypted message
i.e. the number of bytes by which the ciphertext is larger than the
plaintext.
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| NONCEBYTES | Number of bytes in a Nonce.
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| PRECOMPUTEDKEYBYTES | Number of bytes in a PrecomputedKey.
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| PUBLICKEYBYTES | Number of bytes in a PublicKey.
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| SECRETKEYBYTES | Number of bytes in a SecretKey.
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| SEEDBYTES | Number of bytes in a Seed.
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| crypto_init | Run before using crypto.
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| decrypt_data_symmetric | Returns plain data from encrypted, with length of encrypted - 16 due to
padding, or () if data couldn't be decrypted.
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| digest_as_pk | Convert sha256 Digest to PublicKey type.
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| encrypt_data_symmetric | Returns encrypted data from plain, with length of plain + 16 due to
padding.
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| encrypt_precompute | Precomputes the shared key from their_public_key and our_secret_key.
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| gen_keypair | gen_keypair() randomly generates a secret key and a corresponding public key.
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| gen_nonce | gen_nonce() randomly generates a nonce
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| increment_nonce | Inrement given nonce by 1.
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| increment_nonce_number | Inrement given nonce by number num.
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| keypair_from_seed | key_pair_from_seed() deterministically derives a key pair from a single key seed (crypto_box_SEEDBYTES bytes).
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| open | open() verifies and decrypts a ciphertext c using the receiver's secret key sk,
the senders public key pk, and a nonce n. It returns a plaintext Ok(m).
If the ciphertext fails verification, open() returns Err(()).
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| open_detached | open_detached() verifies and decrypts a ciphertext c using the receiver's secret key sk,
the senders public key pk, and a nonce n. c is decrypted in place, so if this function is
successful it will contain the plaintext. If the ciphertext fails verification,
open_detached() returns Err(()), and the ciphertext is not modified.
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| open_detached_precomputed | open_detached_precomputed() verifies and decrypts a ciphertext c using a precomputed key
k and a nonce n. c is decrypted in place, so if this function is successful it will
contain the plaintext. If the ciphertext fails verification, open_detached() returns
Err(()), and the ciphertext is not modified.
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| open_precomputed | open_precomputed() verifies and decrypts a ciphertext c using a precomputed
key k and a nonce n. It returns a plaintext Ok(m).
If the ciphertext fails verification, open_precomputed() returns Err(()).
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| pk_as_digest | Convert PublicKey to sha256 Digest type.
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| precompute | precompute() computes an intermediate key that can be used by seal_precomputed()
and open_precomputed()
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| public_key_valid | Check if Tox public key PUBLICKEYBYTES is valid. Should be used only for
input validation.
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| random_limit_usize | Return unbiased random number from [0, limit) interval.
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| random_u32 | Return a random number.
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| random_u64 | Return a random number.
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| random_usize | Return a random number.
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| randombytes_into | randombytes_into() fills a buffer buf with random data.
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| seal | seal() encrypts and authenticates a message m using the senders secret key sk,
the receivers public key pk and a nonce n. It returns a ciphertext c.
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| seal_detached | seal_detached() encrypts and authenticates a message m using the senders secret key sk,
the receivers public key pk and a nonce n. m is encrypted in place, so after this
function returns it will contain the ciphertext. The detached authentication tag is returned by
value.
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| seal_detached_precomputed | seal_detached_precomputed() encrypts and authenticates a message m using a precomputed key
k and a nonce n. m is encrypted in place, so after this function returns it will contain
the ciphertext. The detached authentication tag is returned by value.
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| seal_precomputed | seal_precomputed() encrypts and authenticates a message m using a precomputed key k,
and a nonce n. It returns a ciphertext c.
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