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Add crypto library. Additional information is included in the README.md
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# crypto
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A crypto library for the Odin language
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## Supported
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This library offers various algorithms available in either native Odin or via bindings to the [Botan](https://botan.randombit.net/) crypto library.
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Please see the chart below for the options.
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**Note:** All crypto hash algorithms, offered by [Botan\'s FFI](https://botan.randombit.net/handbook/api_ref/hash.html), have been added.
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## Hashing algorithms
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| Algorithm | Odin | Botan |
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|:-------------------------------------------------------------------------------------------------------------|:-----------------|:---------------------|
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| [BLAKE](https://web.archive.org/web/20190915215948/https://131002.net/blake) | ✔️ | |
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| [BLAKE2B](https://datatracker.ietf.org/doc/html/rfc7693) | ✔️ | ✔️ |
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| [BLAKE2S](https://datatracker.ietf.org/doc/html/rfc7693) | ✔️ | |
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| [GOST](https://datatracker.ietf.org/doc/html/rfc5831) | ✔️ | ✔️ |
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| [Grøstl](http://www.groestl.info/Groestl.zip) | ✔️ | |
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| [HAVAL](https://web.archive.org/web/20150111210116/http://labs.calyptix.com/haval.php) | ✔️ | |
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| [JH](https://www3.ntu.edu.sg/home/wuhj/research/jh/index.html) | ✔️ | |
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| [Keccak](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf) | ✔️ | ✔️ |
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| [MD2](https://datatracker.ietf.org/doc/html/rfc1319) | ✔️ | |
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| [MD4](https://datatracker.ietf.org/doc/html/rfc1320) | ✔️ | ✔️ |
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| [MD5](https://datatracker.ietf.org/doc/html/rfc1321) | ✔️ | ✔️ |
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| [RIPEMD](https://homes.esat.kuleuven.be/~bosselae/ripemd160.html) | ✔️ | ✔️\* |
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| [SHA-1](https://datatracker.ietf.org/doc/html/rfc3174) | ✔️ | ✔️ |
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| [SHA-2](https://csrc.nist.gov/csrc/media/publications/fips/180/2/archive/2002-08-01/documents/fips180-2.pdf) | ✔️ | ✔️ |
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| [SHA-3](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf) | ✔️ | ✔️ |
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| [SHAKE](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf) | ✔️ | ✔️ |
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| [Skein](https://www.schneier.com/academic/skein/) | | ✔️\*\* |
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| [SM3](https://datatracker.ietf.org/doc/html/draft-sca-cfrg-sm3-02) | ✔️ | ✔️ |
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| [Streebog](https://datatracker.ietf.org/doc/html/rfc6986) | ✔️ | ✔️ |
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| [Tiger](https://www.cs.technion.ac.il/~biham/Reports/Tiger/) | ✔️ | ✔️ |
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| [Tiger2](https://www.cs.technion.ac.il/~biham/Reports/Tiger/) | ✔️ | |
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| [Whirlpool](https://web.archive.org/web/20171129084214/http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html) | ✔️ | ✔️ |
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\* Only `RIPEMD-160`
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\*\* Only `SKEIN-512`
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#### High level API
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Each hash algorithm contains a procedure group named `hash`, or if the algorithm provides more than one digest size `hash_<size>`\*\*\*.
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Included in these groups are four procedures.
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* `hash_string` - Hash a given string and return the computed hash. Just calls `hash_bytes` internally
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* `hash_bytes` - Hash a given byte slice and return the computed hash
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* `hash_stream` - Takes a stream from io.Stream and returns the computed hash from it
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* `hash_file` - Hashes a file. A second boolean parameter controls if the file is streamed (set to false) or read at once (set to true)
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\*\*\* On some algorithms there is another part to the name, since they might offer control about additional parameters.
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For instance, `HAVAL` offers different sizes as well as three different round amounts.
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Computing a 256-bit hash with 3 rounds is therefore achieved by calling `haval.hash_256_3(...)`.
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#### Low level API
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The above mentioned procedures internally call three procedures: `init`, `update` and `final`.
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You may also directly call them, if you wish.
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#### Context system
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The library uses a context system internally to be able to switch between Odin / Botan implementations freely.
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When an Odin implementation is available, it is the default.
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You may change what is used during runtime by calling `foo.use_botan()` or `foo.use_odin()`.
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It is also possible to set this during compile time via `USE_BOTAN_LIB=true`.
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Internally a vtable is used to set the appropriate procedures when switching. This works for all the procedures mentioned in the APIs above.
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#### Example
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```odin
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package crypto_example
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// Import the desired package
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import "core:crypto/md4"
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main :: proc() {
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input := "foo"
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// Compute the hash via Odin implementation
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computed_hash := md4.hash(input)
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// Switch to Botan
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md4.use_botan()
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// Compute the hash via Botan bindings
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computed_hash_botan := md4.hash(input)
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}
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```
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For example uses of all available algorithms, please see the tests within `tests/core/crypto`.
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### Disclaimer
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The algorithms were ported out of curiosity and due to interest in the field.
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We have not had any of the code verified by a third party or tested/fuzzed by any automatic means.
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Whereever we were able to find official test vectors, those were used to verify the implementation.
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We do not recommend using them in a production environment, without any additional testing and/or verification.
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### ToDo
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* Ciphers (Symmetric, Asymmetric)
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* MACs (Message Authentication Code)
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* CSPRNGs (Cryptographically Secure PseudoRandom Number Generator)
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* KDFs (Key Derivation Function)
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* KEAs (Key Exchange Algorithm)
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### License
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This library is made available under the BSD-3 license.
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