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@@ -63,7 +63,7 @@ NIP-44 version 2 has the following design characteristics:
63- SHA256 is used instead of SHA3 or BLAKE because it is already used in nostr. Also BLAKE's speed advantage 63- SHA256 is used instead of SHA3 or BLAKE because it is already used in nostr. Also BLAKE's speed advantage
64 is smaller in non-parallel environments. 64 is smaller in non-parallel environments.
65- A custom padding scheme is used instead of padmé because it provides better leakage reduction for small messages. 65- A custom padding scheme is used instead of padmé because it provides better leakage reduction for small messages.
66- Base64 encoding is used instead of another compression algorithm because it is widely available, and is already used in nostr. 66- Base64 encoding is used instead of another encoding algorithm because it is widely available, and is already used in nostr.
67 67
68### Encryption 68### Encryption
69 69
@@ -86,7 +86,7 @@ NIP-44 version 2 has the following design characteristics:
86 - Content must be encoded from UTF-8 into byte array 86 - Content must be encoded from UTF-8 into byte array
87 - Validate plaintext length. Minimum is 1 byte, maximum is 65535 bytes 87 - Validate plaintext length. Minimum is 1 byte, maximum is 65535 bytes
88 - Padding format is: `[plaintext_length: u16][plaintext][zero_bytes]` 88 - Padding format is: `[plaintext_length: u16][plaintext][zero_bytes]`
89 - Padding algorithm is related to powers-of-two, with min padded msg size of 32 89 - Padding algorithm is related to powers-of-two, with min padded msg size of 32bytes
90 - Plaintext length is encoded in big-endian as first 2 bytes of the padded blob 90 - Plaintext length is encoded in big-endian as first 2 bytes of the padded blob
915. Encrypt padded content 915. Encrypt padded content
92 - Use ChaCha20, with key and nonce from step 3 92 - Use ChaCha20, with key and nonce from step 3
@@ -148,8 +148,8 @@ validation rules, refer to BIP-340.
148 - `x[i:j]`, where `x` is a byte array and `i, j <= 0` returns a `(j - i)`-byte array with a copy of the 148 - `x[i:j]`, where `x` is a byte array and `i, j <= 0` returns a `(j - i)`-byte array with a copy of the
149 `i`-th byte (inclusive) to the `j`-th byte (exclusive) of `x`. 149 `i`-th byte (inclusive) to the `j`-th byte (exclusive) of `x`.
150- Constants `c`: 150- Constants `c`:
151 - `min_plaintext_size` is 1. 1b msg is padded to 32b. 151 - `min_plaintext_size` is 1. 1bytes msg is padded to 32bytes.
152 - `max_plaintext_size` is 65535 (64kb - 1). It is padded to 65536. 152 - `max_plaintext_size` is 65535 (64kB - 1). It is padded to 65536bytes.
153- Functions 153- Functions
154 - `base64_encode(string)` and `base64_decode(bytes)` are Base64 ([RFC 4648](https://datatracker.ietf.org/doc/html/rfc4648), with padding) 154 - `base64_encode(string)` and `base64_decode(bytes)` are Base64 ([RFC 4648](https://datatracker.ietf.org/doc/html/rfc4648), with padding)
155 - `concat` refers to byte array concatenation 155 - `concat` refers to byte array concatenation