Upgrade aes/aes-gcm/block-modes/chacha20poly1305 crates

[tarcieri]

Updates the following crates:

• aes => v0.6
• aes-gcm => v0.8
• block-modes => v0.7
• chacha20poly1305 => v0.7

Signed-off-by: Tony Arcieri bascule@gmail.com

[tarcieri]

Note: the hkdf, hmac, sha2, and sha3 crate dependencies are all out-of-date as well, however you'll be unable to update those until the libsecp256k1 crate releases a new version.

You might consider the k256 crate as an alternative pure Rust implementation of secp256k1. It uses more modern (projective) formulas and provides better performance: https://crates.io/crates/k256

[mikelodder7]

Thanks so much, @tarcieri. I'll make the change to k256 since it closely matches p256 and would allow ECDSA with either curve.

[dcmiddle]

Note: the hkdf, hmac, sha2, and sha3 crate dependencies are all out-of-date as well, however you'll be unable to update those until the libsecp256k1 crate releases a new version.

You might consider the k256 crate as an alternative pure Rust implementation of secp256k1. It uses more modern (projective) formulas and provides better performance: https://crates.io/crates/k256

Cool. I created #163 to discuss.