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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.use digest::{Digest, DynDigest, ExtendableOutput, Update};use typenum::{U16, U20, U28, U32, U48};
/// Enum wrapper over all supported digest implementations.pub enum Context {  Blake2b(Box<blake2::Blake2b512>),  Blake2b128(Box<blake2::Blake2b<U16>>),  Blake2b160(Box<blake2::Blake2b<U20>>),  Blake2b224(Box<blake2::Blake2b<U28>>),  Blake2b256(Box<blake2::Blake2b<U32>>),  Blake2b384(Box<blake2::Blake2b<U48>>),  Blake2s(Box<blake2::Blake2s256>),  Blake3(Box<blake3::Hasher>),  Keccak224(Box<sha3::Keccak224>),  Keccak256(Box<sha3::Keccak256>),  Keccak384(Box<sha3::Keccak384>),  Keccak512(Box<sha3::Keccak512>),  Md4(Box<md4::Md4>),  Md5(Box<md5::Md5>),  Ripemd160(Box<ripemd::Ripemd160>),  Sha1(Box<sha1::Sha1>),  Sha3_224(Box<sha3::Sha3_224>),  Sha3_256(Box<sha3::Sha3_256>),  Sha3_384(Box<sha3::Sha3_384>),  Sha3_512(Box<sha3::Sha3_512>),  Sha224(Box<sha2::Sha224>),  Sha256(Box<sha2::Sha256>),  Sha384(Box<sha2::Sha384>),  Sha512(Box<sha2::Sha512>),  Shake128(Box<sha3::Shake128>),  Shake256(Box<sha3::Shake256>),  Tiger(Box<tiger::Tiger>),  Fnv32(Box<crate::fnv::Fnv32>),  Fnv32A(Box<crate::fnv::Fnv32A>),  Fnv64(Box<crate::fnv::Fnv64>),  Fnv64A(Box<crate::fnv::Fnv64A>),}
use Context::*;
impl Context {  pub fn new(algorithm_name: &str) -> Result<Context, &'static str> {    Ok(match algorithm_name {      "BLAKE2B" => Blake2b(Default::default()),      "BLAKE2B-128" => Blake2b128(Default::default()),      "BLAKE2B-160" => Blake2b160(Default::default()),      "BLAKE2B-224" => Blake2b224(Default::default()),      "BLAKE2B-256" => Blake2b256(Default::default()),      "BLAKE2B-384" => Blake2b384(Default::default()),      "BLAKE2S" => Blake2s(Default::default()),      "BLAKE3" => Blake3(Default::default()),      "KECCAK-224" => Keccak224(Default::default()),      "KECCAK-256" => Keccak256(Default::default()),      "KECCAK-384" => Keccak384(Default::default()),      "KECCAK-512" => Keccak512(Default::default()),      "MD4" => Md4(Default::default()),      "MD5" => Md5(Default::default()),      "RIPEMD-160" => Ripemd160(Default::default()),      "SHA-1" => Sha1(Default::default()),      "SHA3-224" => Sha3_224(Default::default()),      "SHA3-256" => Sha3_256(Default::default()),      "SHA3-384" => Sha3_384(Default::default()),      "SHA3-512" => Sha3_512(Default::default()),      "SHA-224" => Sha224(Default::default()),      "SHA-256" => Sha256(Default::default()),      "SHA-384" => Sha384(Default::default()),      "SHA-512" => Sha512(Default::default()),      "SHAKE128" => Shake128(Default::default()),      "SHAKE256" => Shake256(Default::default()),      "TIGER" => Tiger(Default::default()),      "FNV32" => Fnv32(Box::new(crate::fnv::Fnv32::new())),      "FNV32A" => Fnv32A(Box::new(crate::fnv::Fnv32A::new())),      "FNV64" => Fnv64(Box::new(crate::fnv::Fnv64::new())),      "FNV64A" => Fnv64A(Box::new(crate::fnv::Fnv64A::new())),      _ => return Err("unsupported algorithm"),    })  }
  /// The output digest length for the algorithm, in bytes.  ///  /// If the algorithm is variable-length, this returns its default length.  fn output_length(&self) -> usize {    match self {      Blake2b(context) => context.output_size(),      Blake2b128(context) => context.output_size(),      Blake2b160(context) => context.output_size(),      Blake2b224(context) => context.output_size(),      Blake2b256(context) => context.output_size(),      Blake2b384(context) => context.output_size(),      Blake2s(context) => context.output_size(),      Blake3(context) => context.output_size(),      Keccak224(context) => context.output_size(),      Keccak256(context) => context.output_size(),      Keccak384(context) => context.output_size(),      Keccak512(context) => context.output_size(),      Md4(context) => context.output_size(),      Md5(context) => context.output_size(),      Ripemd160(context) => context.output_size(),      Sha1(context) => context.output_size(),      Sha3_224(context) => context.output_size(),      Sha3_256(context) => context.output_size(),      Sha3_384(context) => context.output_size(),      Sha3_512(context) => context.output_size(),      Sha224(context) => context.output_size(),      Sha256(context) => context.output_size(),      Sha384(context) => context.output_size(),      Sha512(context) => context.output_size(),      Tiger(context) => context.output_size(),      Fnv32(_) => 4,      Fnv32A(_) => 4,      Fnv64(_) => 8,      Fnv64A(_) => 8,
      // https://doi.org/10.6028/NIST.FIPS.202's Table 4 indicates that in order      // to reach the target security strength for these algorithms, the output      // size (in bits) needs to be (at least) two times larger than that      // security strength (in bits).      Shake128(_) => 32, // implying a length of (2 * 128) bits = 32 bytes      Shake256(_) => 64, // implying a length of (2 * 256) bits = 64 bytes    }  }
  /// Whether the algorithm has an extendable variable-length digest output  /// (whether it is an "XOF").  const fn extendable(&self) -> bool {    matches!(self, Blake3(_) | Shake128(_) | Shake256(_))  }
  pub fn update(&mut self, data: &[u8]) {    match self {      Blake2b(context) => Digest::update(&mut **context, data),      Blake2b128(context) => Digest::update(&mut **context, data),      Blake2b160(context) => Digest::update(&mut **context, data),      Blake2b224(context) => Digest::update(&mut **context, data),      Blake2b256(context) => Digest::update(&mut **context, data),      Blake2b384(context) => Digest::update(&mut **context, data),      Blake2s(context) => Digest::update(&mut **context, data),      Blake3(context) => Digest::update(&mut **context, data),      Keccak224(context) => Digest::update(&mut **context, data),      Keccak256(context) => Digest::update(&mut **context, data),      Keccak384(context) => Digest::update(&mut **context, data),      Keccak512(context) => Digest::update(&mut **context, data),      Md4(context) => Digest::update(&mut **context, data),      Md5(context) => Digest::update(&mut **context, data),      Ripemd160(context) => Digest::update(&mut **context, data),      Sha1(context) => Digest::update(&mut **context, data),      Sha3_224(context) => Digest::update(&mut **context, data),      Sha3_256(context) => Digest::update(&mut **context, data),      Sha3_384(context) => Digest::update(&mut **context, data),      Sha3_512(context) => Digest::update(&mut **context, data),      Sha224(context) => Digest::update(&mut **context, data),      Sha256(context) => Digest::update(&mut **context, data),      Sha384(context) => Digest::update(&mut **context, data),      Sha512(context) => Digest::update(&mut **context, data),      Tiger(context) => Digest::update(&mut **context, data),      Shake128(context) => (&mut **context).update(data),      Shake256(context) => (&mut **context).update(data),      Fnv32(context) => (&mut **context).update(data),      Fnv32A(context) => (&mut **context).update(data),      Fnv64(context) => (&mut **context).update(data),      Fnv64A(context) => (&mut **context).update(data),    };  }
  pub fn digest_and_drop(    self,    length: Option<usize>,  ) -> Result<Box<[u8]>, &'static str> {    if let Some(length) = length {      if !self.extendable() && length != self.output_length() {        return Err(          "non-default length specified for non-extendable algorithm",        );      }    }
    let length = length.unwrap_or_else(|| self.output_length());
    Ok(match self {      Blake2b(context) => context.finalize(),      Blake2b128(context) => context.finalize(),      Blake2b160(context) => context.finalize(),      Blake2b224(context) => context.finalize(),      Blake2b256(context) => context.finalize(),      Blake2b384(context) => context.finalize(),      Blake2s(context) => context.finalize(),      Blake3(context) => context.finalize_boxed(length),      Keccak224(context) => context.finalize(),      Keccak256(context) => context.finalize(),      Keccak384(context) => context.finalize(),      Keccak512(context) => context.finalize(),      Md4(context) => context.finalize(),      Md5(context) => context.finalize(),      Ripemd160(context) => context.finalize(),      Sha1(context) => context.finalize(),      Sha3_224(context) => context.finalize(),      Sha3_256(context) => context.finalize(),      Sha3_384(context) => context.finalize(),      Sha3_512(context) => context.finalize(),      Sha224(context) => context.finalize(),      Sha256(context) => context.finalize(),      Sha384(context) => context.finalize(),      Sha512(context) => context.finalize(),      Tiger(context) => context.finalize(),      Shake128(context) => context.finalize_boxed(length),      Shake256(context) => context.finalize_boxed(length),      Fnv32(context) => context.digest(),      Fnv32A(context) => context.digest(),      Fnv64(context) => context.digest(),      Fnv64A(context) => context.digest(),    })  }}