Various feature tweaks and updates

2025-12-08 12:19:24 +00:00 · 2025-08-29 06:14:25 -04:00
parent 90bc364f9f
commit e2dc5db7aa
25 changed files with 126 additions and 462 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2460,12 +2460,10 @@ dependencies = [
 "crypto-bigint 0.5.5",
 "curve25519-dalek",
 "digest 0.10.7",
- "ff",
 "ff-group-tests",
- "group",
 "hex",
+ "prime-field",
 "rand_core 0.6.4",
- "rustversion",
 "sha2 0.11.0-rc.0",
 "subtle",
 "zeroize",
@@ -2793,7 +2791,7 @@ dependencies = [
 name = "dkg-evrf"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "ciphersuite 0.4.2",
 "ciphersuite-kp256",
 "dalek-ff-group",
@@ -3029,13 +3027,13 @@ dependencies = [
 "dalek-ff-group",
 "ff-group-tests",
 "generalized-bulletproofs-ec-gadgets",
- "generic-array 1.2.0",
 "hex",
 "hex-literal",
 "prime-field",
 "rand_core 0.6.4",
 "short-weierstrass",
 "std-shims",
+ "typenum",
 "zeroize",
 ]

@@ -9592,16 +9590,15 @@ dependencies = [
 name = "secq256k1"
 version = "0.1.0"
 dependencies = [
- "blake2 0.11.0-rc.0",
 "ciphersuite 0.4.2",
 "ff-group-tests",
 "generalized-bulletproofs-ec-gadgets",
- "generic-array 1.2.0",
 "hex",
 "hex-literal",
 "k256",
 "prime-field",
 "rand_core 0.6.4",
+ "sha2 0.11.0-rc.0",
 "short-weierstrass",
 "std-shims",
 ]
@@ -9745,7 +9742,7 @@ dependencies = [
 "async-lock",
 "bitcoin",
 "bitvec",
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "ciphersuite 0.4.2",
 "ciphersuite-kp256",
@@ -9807,7 +9804,7 @@ name = "serai-coordinator"
 version = "0.1.0"
 dependencies = [
 "bitvec",
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "ciphersuite 0.4.2",
 "dalek-ff-group",
@@ -9844,7 +9841,7 @@ name = "serai-coordinator-libp2p-p2p"
 version = "0.1.0"
 dependencies = [
 "async-trait",
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "futures-util",
 "hex",
@@ -9898,7 +9895,7 @@ dependencies = [
 name = "serai-coordinator-tributary"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "ciphersuite 0.4.2",
 "dalek-ff-group",
@@ -9921,7 +9918,7 @@ dependencies = [
 name = "serai-cosign"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "log",
 "parity-scale-codec",
@@ -10461,7 +10458,7 @@ dependencies = [
 name = "serai-processor-key-gen"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "ciphersuite 0.4.2",
 "dkg-evrf",
@@ -10509,7 +10506,7 @@ dependencies = [
 name = "serai-processor-scanner"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "group",
 "hex",
@@ -10541,7 +10538,7 @@ dependencies = [
 name = "serai-processor-signers"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "borsh",
 "ciphersuite 0.4.2",
 "dalek-ff-group",
@@ -12608,7 +12605,7 @@ dependencies = [
 name = "tributary-sdk"
 version = "0.1.0"
 dependencies = [
- "blake2 0.10.6",
+ "blake2 0.11.0-rc.0",
 "ciphersuite 0.4.2",
 "dalek-ff-group",
 "flexible-transcript",
--- a/coordinator/Cargo.toml
+++ b/coordinator/Cargo.toml
@@ -21,7 +21,7 @@ zeroize = { version = "^1.5", default-features = false, features = ["std"] }
 bitvec = { version = "1", default-features = false, features = ["std"] }
 rand_core = { version = "0.6", default-features = false, features = ["std"] }

-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 schnorrkel = { version = "0.11", default-features = false, features = ["std"] }

 transcript = { package = "flexible-transcript", path = "../crypto/transcript", default-features = false, features = ["std", "recommended"] }
--- a/coordinator/cosign/Cargo.toml
+++ b/coordinator/cosign/Cargo.toml
@@ -18,7 +18,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 workspace = true

 [dependencies]
-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 schnorrkel = { version = "0.11", default-features = false, features = ["std"] }

 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std", "derive"] }
--- a/coordinator/p2p/libp2p/Cargo.toml
+++ b/coordinator/p2p/libp2p/Cargo.toml
@@ -23,7 +23,7 @@ async-trait = { version = "0.1", default-features = false }
 rand_core = { version = "0.6", default-features = false, features = ["std"] }

 zeroize = { version = "^1.5", default-features = false, features = ["std"] }
-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 schnorrkel = { version = "0.11", default-features = false, features = ["std"] }

 hex = { version = "0.4", default-features = false, features = ["std"] }
--- a/coordinator/tributary-sdk/Cargo.toml
+++ b/coordinator/tributary-sdk/Cargo.toml
@@ -24,7 +24,7 @@ zeroize = { version = "^1.5", default-features = false, features = ["std"] }
 rand = { version = "0.8", default-features = false, features = ["std"] }
 rand_chacha = { version = "0.3", default-features = false, features = ["std"] }

-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 transcript = { package = "flexible-transcript", path = "../../crypto/transcript", version = "0.3", default-features = false, features = ["std", "recommended"] }

 ciphersuite = { path = "../../crypto/ciphersuite", version = "0.4", default-features = false, features = ["std"] }
--- a/coordinator/tributary/Cargo.toml
+++ b/coordinator/tributary/Cargo.toml
@@ -24,7 +24,7 @@ rand_core = { version = "0.6", default-features = false, features = ["std"] }
 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std", "derive"] }
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }

-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 dalek-ff-group = { path = "../../crypto/dalek-ff-group", default-features = false, features = ["std"] }
 dkg = { path = "../../crypto/dkg", default-features = false, features = ["std"] }
--- a/crypto/ciphersuite/Cargo.toml
+++ b/crypto/ciphersuite/Cargo.toml
@@ -38,7 +38,7 @@ rand_core = { version = "0.6", default-features = false, features = ["std"] }
 ff-group-tests = { version = "0.13", path = "../ff-group-tests" }

 [features]
-alloc = ["std-shims", "ff/alloc"]
+alloc = ["std-shims", "digest/alloc", "ff/alloc"]
 std = [
  "alloc",

--- a/crypto/dalek-ff-group/Cargo.toml
+++ b/crypto/dalek-ff-group/Cargo.toml
@@ -17,8 +17,6 @@ rustdoc-args = ["--cfg", "docsrs"]
 workspace = true

 [dependencies]
-rustversion = "1"
-
 zeroize = { version = "^1.5", default-features = false, features = ["zeroize_derive"] }
 subtle = { version = "^2.4", default-features = false }

@@ -27,8 +25,7 @@ rand_core = { version = "0.6", default-features = false }
 digest = { version = "0.10", default-features = false }
 sha2 = { version = "0.11.0-rc.0", default-features = false }

-ff = { version = "0.13", default-features = false, features = ["bits"] }
-group = { version = "0.13", default-features = false }
+prime-field = { path = "../prime-field", default-features = false }
 ciphersuite = { version = "0.4.2", path = "../ciphersuite", default-features = false }

 crypto-bigint = { version = "0.5", default-features = false, features = ["zeroize"] }
@@ -41,6 +38,6 @@ rand_core = { version = "0.6", default-features = false, features = ["std"] }
 ff-group-tests = { path = "../ff-group-tests" }

 [features]
-alloc = ["zeroize/alloc", "ciphersuite/alloc", "curve25519-dalek/alloc"]
-std = ["alloc", "zeroize/std", "subtle/std", "rand_core/std", "digest/std", "ciphersuite/std"]
+alloc = ["zeroize/alloc", "digest/alloc", "prime-field/alloc", "ciphersuite/alloc", "curve25519-dalek/alloc"]
+std = ["alloc", "zeroize/std", "subtle/std", "rand_core/std", "digest/std", "prime-field/std", "ciphersuite/std"]
 default = ["std"]
--- a/crypto/dalek-ff-group/src/ciphersuite.rs
+++ b/crypto/dalek-ff-group/src/ciphersuite.rs
@@ -2,10 +2,9 @@ use zeroize::Zeroize;

 use sha2::Sha512;

-use group::Group;
-use crate::Scalar;
+use ciphersuite::{group::Group, Ciphersuite};

-use ciphersuite::Ciphersuite;
+use crate::Scalar;

 macro_rules! dalek_curve {
  (
--- a/crypto/dalek-ff-group/src/field.rs
+++ b/crypto/dalek-ff-group/src/field.rs
@@ -1,374 +0,0 @@
-use core::{
-  ops::{Add, AddAssign, Sub, SubAssign, Neg, Mul, MulAssign},
-  iter::{Sum, Product},
-};
-
-use zeroize::Zeroize;
-use rand_core::RngCore;
-
-use subtle::{
-  Choice, CtOption, ConstantTimeEq, ConstantTimeLess, ConditionallyNegatable,
-  ConditionallySelectable,
-};
-
-use crypto_bigint::{
-  Integer, NonZero, Encoding, U256, U512,
-  modular::constant_mod::{ResidueParams, Residue},
-  impl_modulus,
-};
-
-use group::ff::{Field, PrimeField, FieldBits, PrimeFieldBits, FromUniformBytes};
-
-use crate::{u8_from_bool, constant_time, math_op, math};
-
-// 2 ** 255 - 19
-// Uses saturating_sub because checked_sub isn't available at compile time
-const MODULUS: U256 = U256::from_u8(1).shl_vartime(255).saturating_sub(&U256::from_u8(19));
-const WIDE_MODULUS: U512 = U256::ZERO.concat(&MODULUS);
-
-impl_modulus!(
-  FieldModulus,
-  U256,
-  // 2 ** 255 - 19
-  "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed"
-);
-type ResidueType = Residue<FieldModulus, { FieldModulus::LIMBS }>;
-
-/// A constant-time implementation of the Ed25519 field.
-#[derive(Clone, Copy, PartialEq, Eq, Default, Debug, Zeroize)]
-#[repr(transparent)]
-pub struct FieldElement(ResidueType);
-
-// Square root of -1.
-// Formula from RFC-8032 (modp_sqrt_m1/sqrt8k5 z)
-// 2 ** ((MODULUS - 1) // 4) % MODULUS
-const SQRT_M1: FieldElement = FieldElement(
-  ResidueType::new(&U256::from_u8(2))
-    .pow(&MODULUS.saturating_sub(&U256::ONE).wrapping_div(&U256::from_u8(4))),
-);
-
-// Constant useful in calculating square roots (RFC-8032 sqrt8k5's exponent used to calculate y)
-const MOD_3_8: FieldElement = FieldElement(ResidueType::new(
-  &MODULUS.saturating_add(&U256::from_u8(3)).wrapping_div(&U256::from_u8(8)),
-));
-
-// Constant useful in sqrt_ratio_i (sqrt(u / v))
-const MOD_5_8: FieldElement = FieldElement(ResidueType::sub(&MOD_3_8.0, &ResidueType::ONE));
-
-fn reduce(x: U512) -> ResidueType {
-  ResidueType::new(&U256::from_le_slice(
-    &x.rem(&NonZero::new(WIDE_MODULUS).unwrap()).to_le_bytes()[.. 32],
-  ))
-}
-
-constant_time!(FieldElement, ResidueType);
-math!(
-  FieldElement,
-  FieldElement,
-  |x: ResidueType, y: ResidueType| x.add(&y),
-  |x: ResidueType, y: ResidueType| x.sub(&y),
-  |x: ResidueType, y: ResidueType| x.mul(&y)
-);
-
-macro_rules! from_wrapper {
-  ($uint: ident) => {
-    impl From<$uint> for FieldElement {
-      fn from(a: $uint) -> FieldElement {
-        Self(ResidueType::new(&U256::from(a)))
-      }
-    }
-  };
-}
-
-from_wrapper!(u8);
-from_wrapper!(u16);
-from_wrapper!(u32);
-from_wrapper!(u64);
-from_wrapper!(u128);
-
-impl Neg for FieldElement {
-  type Output = Self;
-  fn neg(self) -> Self::Output {
-    Self(self.0.neg())
-  }
-}
-
-impl Neg for &FieldElement {
-  type Output = FieldElement;
-  fn neg(self) -> Self::Output {
-    (*self).neg()
-  }
-}
-
-impl Field for FieldElement {
-  const ZERO: Self = Self(ResidueType::ZERO);
-  const ONE: Self = Self(ResidueType::ONE);
-
-  fn random(mut rng: impl RngCore) -> Self {
-    let mut bytes = [0; 64];
-    rng.fill_bytes(&mut bytes);
-    FieldElement(reduce(U512::from_le_bytes(bytes)))
-  }
-
-  fn square(&self) -> Self {
-    FieldElement(self.0.square())
-  }
-  fn double(&self) -> Self {
-    FieldElement(self.0.add(&self.0))
-  }
-
-  fn invert(&self) -> CtOption<Self> {
-    const NEG_2: FieldElement =
-      FieldElement(ResidueType::new(&MODULUS.saturating_sub(&U256::from_u8(2))));
-    CtOption::new(self.pow(NEG_2), !self.is_zero())
-  }
-
-  // RFC-8032 sqrt8k5
-  fn sqrt(&self) -> CtOption<Self> {
-    let tv1 = self.pow(MOD_3_8);
-    let tv2 = tv1 * SQRT_M1;
-    let candidate = Self::conditional_select(&tv2, &tv1, tv1.square().ct_eq(self));
-    CtOption::new(candidate, candidate.square().ct_eq(self))
-  }
-
-  fn sqrt_ratio(u: &FieldElement, v: &FieldElement) -> (Choice, FieldElement) {
-    let i = SQRT_M1;
-
-    let u = *u;
-    let v = *v;
-
-    let v3 = v.square() * v;
-    let v7 = v3.square() * v;
-    let mut r = (u * v3) * (u * v7).pow(MOD_5_8);
-
-    let check = v * r.square();
-    let correct_sign = check.ct_eq(&u);
-    let flipped_sign = check.ct_eq(&(-u));
-    let flipped_sign_i = check.ct_eq(&((-u) * i));
-
-    r.conditional_assign(&(r * i), flipped_sign | flipped_sign_i);
-
-    let r_is_negative = r.is_odd();
-    r.conditional_negate(r_is_negative);
-
-    (correct_sign | flipped_sign, r)
-  }
-}
-
-impl PrimeField for FieldElement {
-  type Repr = [u8; 32];
-
-  // Big endian representation of the modulus
-  const MODULUS: &'static str = "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed";
-
-  const NUM_BITS: u32 = 255;
-  const CAPACITY: u32 = 254;
-
-  const TWO_INV: Self = FieldElement(ResidueType::new(&U256::from_u8(2)).invert().0);
-
-  // This was calculated with the method from the ff crate docs
-  // SageMath GF(modulus).primitive_element()
-  const MULTIPLICATIVE_GENERATOR: Self = Self(ResidueType::new(&U256::from_u8(2)));
-  // This was set per the specification in the ff crate docs
-  // The number of leading zero bits in the little-endian bit representation of (modulus - 1)
-  const S: u32 = 2;
-
-  // This was calculated via the formula from the ff crate docs
-  // Self::MULTIPLICATIVE_GENERATOR ** ((modulus - 1) >> Self::S)
-  const ROOT_OF_UNITY: Self = FieldElement(ResidueType::new(&U256::from_be_hex(
-    "2b8324804fc1df0b2b4d00993dfbd7a72f431806ad2fe478c4ee1b274a0ea0b0",
-  )));
-  // Self::ROOT_OF_UNITY.invert()
-  const ROOT_OF_UNITY_INV: Self = FieldElement(Self::ROOT_OF_UNITY.0.invert().0);
-
-  // This was calculated via the formula from the ff crate docs
-  // Self::MULTIPLICATIVE_GENERATOR ** (2 ** Self::S)
-  const DELTA: Self = FieldElement(ResidueType::new(&U256::from_be_hex(
-    "0000000000000000000000000000000000000000000000000000000000000010",
-  )));
-
-  fn from_repr(bytes: [u8; 32]) -> CtOption<Self> {
-    let res = U256::from_le_bytes(bytes);
-    CtOption::new(Self(ResidueType::new(&res)), res.ct_lt(&MODULUS))
-  }
-  fn to_repr(&self) -> [u8; 32] {
-    self.0.retrieve().to_le_bytes()
-  }
-
-  fn is_odd(&self) -> Choice {
-    self.0.retrieve().is_odd()
-  }
-
-  fn from_u128(num: u128) -> Self {
-    Self::from(num)
-  }
-}
-
-impl PrimeFieldBits for FieldElement {
-  type ReprBits = [u8; 32];
-
-  fn to_le_bits(&self) -> FieldBits<Self::ReprBits> {
-    self.to_repr().into()
-  }
-
-  fn char_le_bits() -> FieldBits<Self::ReprBits> {
-    MODULUS.to_le_bytes().into()
-  }
-}
-
-impl FieldElement {
-  /// Create a FieldElement from a `crypto_bigint::U256`.
-  ///
-  /// This will reduce the `U256` by the modulus, into a member of the field.
-  pub const fn from_u256(u256: &U256) -> Self {
-    FieldElement(Residue::new(u256))
-  }
-
-  /// Create a `FieldElement` from the reduction of a 512-bit number.
-  ///
-  /// The bytes are interpreted in little-endian format.
-  pub fn wide_reduce(value: [u8; 64]) -> Self {
-    FieldElement(reduce(U512::from_le_bytes(value)))
-  }
-
-  /// Perform an exponentiation.
-  pub fn pow(&self, other: FieldElement) -> FieldElement {
-    let mut table = [FieldElement::ONE; 16];
-    table[1] = *self;
-    for i in 2 .. 16 {
-      table[i] = table[i - 1] * self;
-    }
-
-    let mut res = FieldElement::ONE;
-    let mut bits = 0;
-    for (i, mut bit) in other.to_le_bits().iter_mut().rev().enumerate() {
-      bits <<= 1;
-      let mut bit = u8_from_bool(&mut bit);
-      bits |= bit;
-      bit.zeroize();
-
-      if ((i + 1) % 4) == 0 {
-        if i != 3 {
-          for _ in 0 .. 4 {
-            res *= res;
-          }
-        }
-
-        let mut scale_by = FieldElement::ONE;
-        #[allow(clippy::needless_range_loop)]
-        for i in 0 .. 16 {
-          #[allow(clippy::cast_possible_truncation)] // Safe since 0 .. 16
-          {
-            scale_by = <_>::conditional_select(&scale_by, &table[i], bits.ct_eq(&(i as u8)));
-          }
-        }
-        res *= scale_by;
-        bits = 0;
-      }
-    }
-    res
-  }
-
-  /// The square root of u/v, as used for Ed25519 point decoding (RFC 8032 5.1.3) and within
-  /// Ristretto (5.1 Extracting an Inverse Square Root).
-  ///
-  /// The result is only a valid square root if the Choice is true.
-  /// RFC 8032 simply fails if there isn't a square root, leaving any return value undefined.
-  /// Ristretto explicitly returns 0 or sqrt((SQRT_M1 * u) / v).
-  pub fn sqrt_ratio_i(u: FieldElement, v: FieldElement) -> (Choice, FieldElement) {
-    let i = SQRT_M1;
-
-    let v3 = v.square() * v;
-    let v7 = v3.square() * v;
-    // Candidate root
-    let mut r = (u * v3) * (u * v7).pow(MOD_5_8);
-
-    // 8032 3.1
-    let check = v * r.square();
-    let correct_sign = check.ct_eq(&u);
-    // 8032 3.2 conditional
-    let neg_u = -u;
-    let flipped_sign = check.ct_eq(&neg_u);
-    // Ristretto Step 5
-    let flipped_sign_i = check.ct_eq(&(neg_u * i));
-
-    // 3.2 set
-    r.conditional_assign(&(r * i), flipped_sign | flipped_sign_i);
-
-    // Always return the even root, per Ristretto
-    // This doesn't break Ed25519 point decoding as that doesn't expect these steps to return a
-    // specific root
-    // Ed25519 points include a dedicated sign bit to determine which root to use, so at worst
-    // this is a pointless inefficiency
-    r.conditional_negate(r.is_odd());
-
-    (correct_sign | flipped_sign, r)
-  }
-}
-
-impl FromUniformBytes<64> for FieldElement {
-  fn from_uniform_bytes(bytes: &[u8; 64]) -> Self {
-    Self::wide_reduce(*bytes)
-  }
-}
-
-impl Sum<FieldElement> for FieldElement {
-  fn sum<I: Iterator<Item = FieldElement>>(iter: I) -> FieldElement {
-    let mut res = FieldElement::ZERO;
-    for item in iter {
-      res += item;
-    }
-    res
-  }
-}
-
-impl<'a> Sum<&'a FieldElement> for FieldElement {
-  fn sum<I: Iterator<Item = &'a FieldElement>>(iter: I) -> FieldElement {
-    iter.copied().sum()
-  }
-}
-
-impl Product<FieldElement> for FieldElement {
-  fn product<I: Iterator<Item = FieldElement>>(iter: I) -> FieldElement {
-    let mut res = FieldElement::ONE;
-    for item in iter {
-      res *= item;
-    }
-    res
-  }
-}
-
-impl<'a> Product<&'a FieldElement> for FieldElement {
-  fn product<I: Iterator<Item = &'a FieldElement>>(iter: I) -> FieldElement {
-    iter.copied().product()
-  }
-}
-
-#[test]
-fn test_wide_modulus() {
-  let mut wide = [0; 64];
-  wide[.. 32].copy_from_slice(&MODULUS.to_le_bytes());
-  assert_eq!(wide, WIDE_MODULUS.to_le_bytes());
-}
-
-#[test]
-fn test_sqrt_m1() {
-  // Test equivalence against the known constant value
-  const SQRT_M1_MAGIC: U256 =
-    U256::from_be_hex("2b8324804fc1df0b2b4d00993dfbd7a72f431806ad2fe478c4ee1b274a0ea0b0");
-  assert_eq!(SQRT_M1.0.retrieve(), SQRT_M1_MAGIC);
-
-  // Also test equivalence against the result of the formula from RFC-8032 (modp_sqrt_m1/sqrt8k5 z)
-  // 2 ** ((MODULUS - 1) // 4) % MODULUS
-  assert_eq!(
-    SQRT_M1,
-    FieldElement::from(2u8).pow(FieldElement(ResidueType::new(
-      &(FieldElement::ZERO - FieldElement::ONE).0.retrieve().wrapping_div(&U256::from(4u8))
-    )))
-  );
-}
-
-#[test]
-fn test_field() {
-  ff_group_tests::prime_field::test_prime_field_bits::<_, FieldElement>(&mut rand_core::OsRng);
-}
--- a/crypto/dalek-ff-group/src/lib.rs
+++ b/crypto/dalek-ff-group/src/lib.rs
@@ -29,33 +29,16 @@ use dalek::{
 };
 pub use constants::{ED25519_BASEPOINT_TABLE, RISTRETTO_BASEPOINT_TABLE};

-use group::{
+use ::ciphersuite::group::{
  ff::{Field, PrimeField, FieldBits, PrimeFieldBits, FromUniformBytes},
  Group, GroupEncoding,
  prime::PrimeGroup,
 };

-mod field;
-pub use field::FieldElement;
-
 mod ciphersuite;
 pub use crate::ciphersuite::{Ed25519, Ristretto};

-// Use black_box when possible
-#[rustversion::since(1.66)]
-mod black_box {
-  pub(crate) fn black_box<T>(val: T) -> T {
-    #[allow(clippy::incompatible_msrv)]
-    core::hint::black_box(val)
-  }
-}
-#[rustversion::before(1.66)]
-mod black_box {
-  pub(crate) fn black_box<T>(val: T) -> T {
-    val
-  }
-}
-use black_box::black_box;
+use core::hint::black_box;

 fn u8_from_bool(bit_ref: &mut bool) -> u8 {
  let bit_ref = black_box(bit_ref);
@@ -502,3 +485,30 @@ fn test_ed25519_group() {
 fn test_ristretto_group() {
  ff_group_tests::group::test_prime_group_bits::<_, RistrettoPoint>(&mut rand_core::OsRng);
 }
+
+type ThirtyTwoArray = [u8; 32];
+prime_field::odd_prime_field_with_specific_repr!(
+  FieldElement,
+  "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed",
+  "02",
+  false,
+  crate::ThirtyTwoArray
+);
+
+impl FieldElement {
+  /// Create a FieldElement from a `crypto_bigint::U256`.
+  ///
+  /// This will reduce the `U256` by the modulus, into a member of the field.
+  #[deprecated]
+  pub const fn from_u256(u256: &crypto_bigint::U256) -> Self {
+    FieldElement::from(&prime_field::crypto_bigint::U256::from_words(*u256.as_words()))
+  }
+
+  /// Create a `FieldElement` from the reduction of a 512-bit number.
+  ///
+  /// The bytes are interpreted in little-endian format.
+  #[deprecated]
+  pub fn wide_reduce(value: [u8; 64]) -> Self {
+    <FieldElement as ::ciphersuite::group::ff::FromUniformBytes<_>>::from_uniform_bytes(&value)
+  }
+}
--- a/crypto/dkg/evrf/Cargo.toml
+++ b/crypto/dkg/evrf/Cargo.toml
@@ -31,7 +31,7 @@ ciphersuite = { path = "../../ciphersuite", version = "^0.4.1", default-features
 multiexp = { path = "../../multiexp", version = "0.4", default-features = false }

 generic-array = { version = "1", default-features = false, features = ["alloc"] }
-blake2 = { version = "0.10", default-features = false }
+blake2 = { version = "0.11.0-rc.0", default-features = false }
 rand_chacha = { version = "0.3", default-features = false }

 generalized-bulletproofs = { git = "https://github.com/monero-oxide/monero-oxide", rev = "a6f8797007e768488568b821435cf5006517a962", default-features = false }
@@ -70,7 +70,6 @@ std = [
  "multiexp/std",
  "multiexp/batch",

-  "blake2/std",
  "rand_chacha/std",

  "generalized-bulletproofs/std",
--- a/crypto/dkg/evrf/src/curves.rs
+++ b/crypto/dkg/evrf/src/curves.rs
@@ -7,7 +7,7 @@ use rand_chacha::ChaCha20Rng;

 use blake2::{
  digest::{
-    generic_array::{typenum::U32, GenericArray},
+    array::{typenum::U32, Array},
    crypto_common::KeySizeUser,
    KeyInit, Mac,
  },
@@ -48,7 +48,7 @@ impl<C: Curves> Generators<C> {
  /// This is deterministic to the towering curve's (possibly truncated) ID and generator.
  pub fn new(max_threshold: u16, max_participants: u16) -> Generators<C> {
    let entropy = <Blake2s256Keyed as KeyInit>::new(&{
-      let mut key = GenericArray::<u8, <Blake2s256Keyed as KeySizeUser>::KeySize>::default();
+      let mut key = Array::<u8, <Blake2s256Keyed as KeySizeUser>::KeySize>::default();
      let key_len = key.len().min(<C::ToweringCurve as Ciphersuite>::ID.len());
      {
        let key: &mut [u8] = key.as_mut();
--- a/crypto/ed448/Cargo.toml
+++ b/crypto/ed448/Cargo.toml
@@ -32,6 +32,6 @@ rand_core = { version = "0.6", default-features = false, features = ["std"] }
 ff-group-tests = { path = "../ff-group-tests" }

 [features]
-alloc = ["zeroize/alloc", "prime-field/alloc", "ciphersuite/alloc"]
+alloc = ["zeroize/alloc", "sha3/alloc", "prime-field/alloc", "ciphersuite/alloc"]
 std = ["alloc", "zeroize/std", "prime-field/std", "ciphersuite/std"]
 default = ["std"]
--- a/crypto/embedwards25519/Cargo.toml
+++ b/crypto/embedwards25519/Cargo.toml
@@ -20,7 +20,7 @@ std-shims = { version = "0.1", path = "../../common/std-shims", default-features

 zeroize = { version = "^1.5", default-features = false, features = ["zeroize_derive"] }

-generic-array = { version = "1", default-features = false }
+typenum = { version = "1", default-features = false }

 prime-field = { path = "../prime-field", default-features = false }
 short-weierstrass = { path = "../short-weierstrass", default-features = false }
@@ -40,6 +40,6 @@ rand_core = { version = "0.6", features = ["std"] }
 ff-group-tests = { path = "../ff-group-tests" }

 [features]
-alloc = ["std-shims", "zeroize/alloc", "prime-field/alloc", "short-weierstrass/alloc", "curve25519-dalek/alloc", "ciphersuite/alloc", "generalized-bulletproofs-ec-gadgets"]
+alloc = ["std-shims", "zeroize/alloc", "prime-field/alloc", "short-weierstrass/alloc", "curve25519-dalek/alloc", "blake2/alloc", "ciphersuite/alloc", "generalized-bulletproofs-ec-gadgets"]
 std = ["alloc", "std-shims/std", "zeroize/std", "prime-field/std", "short-weierstrass/std", "ciphersuite/std", "generalized-bulletproofs-ec-gadgets/std"]
 default = ["std"]
--- a/crypto/embedwards25519/src/lib.rs
+++ b/crypto/embedwards25519/src/lib.rs
@@ -109,7 +109,7 @@ impl ciphersuite::Ciphersuite for Embedwards25519 {

 #[cfg(feature = "alloc")]
 impl generalized_bulletproofs_ec_gadgets::DiscreteLogParameter for Embedwards25519 {
-  type ScalarBits = generic_array::typenum::U<{ <Scalar as PrimeField>::NUM_BITS as usize }>;
+  type ScalarBits = typenum::U<{ <Scalar as PrimeField>::NUM_BITS as usize }>;
 }

 #[test]
--- a/crypto/prime-field/src/lib.rs
+++ b/crypto/prime-field/src/lib.rs
@@ -85,7 +85,7 @@ pub mod __prime_field_private {
  }
 }

-/// Construct a odd-prime field.
+/// Construct a odd-prime field with a specified `Repr`.
 ///
 /// The length of the `modulus_as_be_hex` string will effect the size of the underlying
 /// representation and the encoding. It MAY have a "0x" prefix, if preferred.
@@ -94,13 +94,15 @@ pub mod __prime_field_private {
 /// less than `modulus_as_be_hex`.
 ///
 /// `big_endian` controls if the encoded representation will be big-endian or not.
+#[doc(hidden)]
 #[macro_export]
-macro_rules! odd_prime_field {
+macro_rules! odd_prime_field_with_specific_repr {
  (
    $name: ident,
    $modulus_as_be_hex: expr,
    $multiplicative_generator_as_be_hex: expr,
-    $big_endian: literal
+    $big_endian: literal,
+    $repr: path
  ) => {
    prime_field::__prime_field_private::paste::paste! {
      mod [<$name __prime_field_private>] {
@@ -413,6 +415,7 @@ macro_rules! odd_prime_field {
          }
        }

+        /// The encoded representation of a `$name`.
        #[derive(Clone, Copy)]
        pub struct Repr([u8; MODULUS_BYTES]);
        impl Default for Repr {
@@ -432,7 +435,7 @@ macro_rules! odd_prime_field {
        }

        impl PrimeField for $name {
-          type Repr = Repr;
+          type Repr = $repr;
          const MODULUS: &str = $modulus_as_be_hex;
          const NUM_BITS: u32 = MODULUS.bits();
          const CAPACITY: u32 = Self::NUM_BITS - 1;
@@ -452,26 +455,30 @@ macro_rules! odd_prime_field {
          };

          fn to_repr(&self) -> Self::Repr {
-            let mut res = Repr([0; _]);
+            let mut res = Self::Repr::default();
+            {
+              let res: &mut [u8] = res.as_mut();
              if $big_endian {
-              res.0.copy_from_slice(
+                res.copy_from_slice(
                  &self.0.retrieve().to_be_bytes()[(UnderlyingUint::BYTES - MODULUS_BYTES) ..]
                );
              } else {
-              res.0.copy_from_slice(&self.0.retrieve().to_le_bytes()[.. MODULUS_BYTES]);
+                res.copy_from_slice(&self.0.retrieve().to_le_bytes()[.. MODULUS_BYTES]);
+              }
            }
            res
          }
          fn from_repr(repr: Self::Repr) -> CtOption<Self> {
            let mut expanded_repr = [0; UnderlyingUint::BYTES];
+            let repr: &[u8] = repr.as_ref();
            let result = Self(if $big_endian {
-              expanded_repr[(UnderlyingUint::BYTES - MODULUS_BYTES) .. ].copy_from_slice(&repr.0);
+              expanded_repr[(UnderlyingUint::BYTES - MODULUS_BYTES) .. ].copy_from_slice(repr);
              Underlying::new(&UnderlyingUint::from_be_bytes(expanded_repr))
            } else {
-              expanded_repr[.. MODULUS_BYTES].copy_from_slice(&repr.0);
+              expanded_repr[.. MODULUS_BYTES].copy_from_slice(repr);
              Underlying::new(&UnderlyingUint::from_le_bytes(expanded_repr))
            });
-            CtOption::new(result, result.to_repr().0.ct_eq(&repr.0))
+            CtOption::new(result, repr.ct_eq(&result.to_repr().as_ref()))
          }
          fn is_odd(&self) -> Choice {
            self.0.retrieve().is_odd()
@@ -535,3 +542,30 @@ macro_rules! odd_prime_field {
    }
  };
 }
+
+/// Construct a odd-prime field.
+///
+/// The length of the `modulus_as_be_hex` string will effect the size of the underlying
+/// representation and the encoding. It MAY have a "0x" prefix, if preferred.
+///
+/// `multiplicative_generator_as_be_hex` MAY have a "0x" prefix. It MAY be short and of a length
+/// less than `modulus_as_be_hex`.
+///
+/// `big_endian` controls if the encoded representation will be big-endian or not.
+#[macro_export]
+macro_rules! odd_prime_field {
+  (
+    $name: ident,
+    $modulus_as_be_hex: expr,
+    $multiplicative_generator_as_be_hex: expr,
+    $big_endian: literal
+  ) => {
+    prime_field::odd_prime_field_with_specific_repr!(
+      $name,
+      $modulus_as_be_hex,
+      $multiplicative_generator_as_be_hex,
+      $big_endian,
+      Repr
+    );
+  };
+}
--- a/crypto/secq256k1/Cargo.toml
+++ b/crypto/secq256k1/Cargo.toml
@@ -18,12 +18,11 @@ hex-literal = { version = "0.4", default-features = false }

 std-shims = { version = "0.1", path = "../../common/std-shims", default-features = false, optional = true }

-generic-array = { version = "1", default-features = false }
 k256 = { version = "0.13", default-features = false, features = ["arithmetic"] }
 prime-field = { path = "../prime-field", default-features = false }
 short-weierstrass = { path = "../short-weierstrass", default-features = false }

-blake2 = { version = "0.11.0-rc.0", default-features = false }
+sha2 = { version = "0.11.0-rc.0", default-features = false }
 ciphersuite = { path = "../ciphersuite", version = "0.4", default-features = false }
 generalized-bulletproofs-ec-gadgets = { git = "https://github.com/monero-oxide/monero-oxide", rev = "a6f8797007e768488568b821435cf5006517a962", default-features = false, optional = true }

@@ -35,6 +34,6 @@ rand_core = { version = "0.6", features = ["std"] }
 ff-group-tests = { path = "../ff-group-tests" }

 [features]
-alloc = ["std-shims", "generic-array/alloc", "k256/alloc", "prime-field/alloc", "short-weierstrass/alloc", "ciphersuite/alloc", "generalized-bulletproofs-ec-gadgets"]
+alloc = ["std-shims", "k256/alloc", "prime-field/alloc", "short-weierstrass/alloc", "sha2/alloc", "ciphersuite/alloc", "generalized-bulletproofs-ec-gadgets"]
 std = ["alloc", "std-shims/std", "k256/std", "prime-field/std", "ciphersuite/std", "generalized-bulletproofs-ec-gadgets/std"]
 default = ["std"]
--- a/crypto/secq256k1/src/lib.rs
+++ b/crypto/secq256k1/src/lib.rs
@@ -8,8 +8,10 @@ use std_shims::prelude::*;
 #[cfg(feature = "alloc")]
 use std_shims::io::{self, Read};

-// Doesn't use the `generic-array 0.14` exported by `k256::elliptic_curve` as we need `1.0`
-use generic_array::{typenum::U33, GenericArray};
+use sha2::{
+  digest::array::{typenum::U33, Array},
+  Sha512,
+};
 use k256::elliptic_curve::{
  subtle::{Choice, ConstantTimeEq, ConditionallySelectable},
  zeroize::Zeroize,
@@ -66,11 +68,11 @@ impl ShortWeierstrass for Secq256k1 {
  });
  type Scalar = Scalar;

-  type Repr = GenericArray<u8, U33>;
+  type Repr = Array<u8, U33>;
  /// Use the SEC1-encoded identity point, which happens to be all zeroes
-  const IDENTITY: Self::Repr = GenericArray::from_array([0; 33]);
+  const IDENTITY: Self::Repr = Array([0; 33]);
  fn encode_compressed(x: Self::FieldElement, odd_y: Choice) -> Self::Repr {
-    let mut res = GenericArray::default();
+    let mut res = Array([0; 33]);
    res[0] =
      <_>::conditional_select(&(Tag::CompressedEvenY as u8), &(Tag::CompressedOddY as u8), odd_y);
    {
@@ -110,7 +112,7 @@ pub type Point = Projective<Secq256k1>;
 impl ciphersuite::Ciphersuite for Secq256k1 {
  type F = Scalar;
  type G = Point;
-  type H = blake2::Blake2b512;
+  type H = Sha512;

  const ID: &'static [u8] = b"secq256k1";

@@ -136,7 +138,7 @@ impl ciphersuite::Ciphersuite for Secq256k1 {

 #[cfg(feature = "alloc")]
 impl generalized_bulletproofs_ec_gadgets::DiscreteLogParameter for Secq256k1 {
-  type ScalarBits = generic_array::typenum::U<{ Scalar::NUM_BITS as usize }>;
+  type ScalarBits = sha2::digest::array::typenum::U<{ Scalar::NUM_BITS as usize }>;
 }

 #[test]
@@ -149,7 +151,7 @@ fn generator() {
  use ciphersuite::group::GroupEncoding;
  assert_eq!(
    Point::generator(),
-    Point::from_bytes(GenericArray::from_slice(&hex_literal::hex!(
+    Point::from_bytes(&Array(hex_literal::hex!(
      "020000000000000000000000000000000000000000000000000000000000000001"
    )))
    .unwrap()
--- a/deny.toml
+++ b/deny.toml
@@ -132,6 +132,7 @@ unknown-git = "deny"
 allow-registry = ["https://github.com/rust-lang/crates.io-index"]
 allow-git = [
  "https://github.com/rust-lang-nursery/lazy-static.rs",
+  "https://github.com/kayabaNerve/hybrid-array",
  "https://github.com/kayabaNerve/elliptic-curves",
  "https://github.com/monero-oxide/monero-oxide",
  "https://github.com/serai-dex/substrate-bip39",
--- a/processor/key-gen/Cargo.toml
+++ b/processor/key-gen/Cargo.toml
@@ -29,7 +29,7 @@ rand_core = { version = "0.6", default-features = false, features = ["std", "get
 rand_chacha = { version = "0.3", default-features = false, features = ["std"] }

 # Cryptography
-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 transcript = { package = "flexible-transcript", path = "../../crypto/transcript", default-features = false, features = ["std"] }
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 dkg = { package = "dkg-evrf", path = "../../crypto/dkg/evrf", default-features = false, features = ["std", "ristretto"] }
--- a/processor/scanner/Cargo.toml
+++ b/processor/scanner/Cargo.toml
@@ -24,7 +24,7 @@ scale = { package = "parity-scale-codec", version = "3", default-features = fals
 borsh = { version = "1", default-features = false, features = ["std", "derive", "de_strict_order"] }

 # Cryptography
-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 group = { version = "0.13", default-features = false }

 # Application
--- a/processor/signers/Cargo.toml
+++ b/processor/signers/Cargo.toml
@@ -24,7 +24,7 @@ workspace = true
 rand_core = { version = "0.6", default-features = false }
 zeroize = { version = "1", default-features = false, features = ["std"] }

-blake2 = { version = "0.10", default-features = false, features = ["std"] }
+blake2 = { version = "0.11.0-rc.0", default-features = false, features = ["alloc"] }
 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 dalek-ff-group = { path = "../../crypto/dalek-ff-group", default-features = false, features = ["std"] }
 frost = { package = "modular-frost", path = "../../crypto/frost", default-features = false }
--- a/substrate/client/Cargo.toml
+++ b/substrate/client/Cargo.toml
@@ -49,7 +49,7 @@ monero-address = { git = "https://github.com/monero-oxide/monero-oxide", rev = "
 rand_core = "0.6"
 hex = "0.4"

-blake2 = "0.10"
+blake2 = "0.11.0-rc.0"

 ciphersuite = { path = "../../crypto/ciphersuite" }
 dalek-ff-group = { path = "../../crypto/dalek-ff-group" }
--- a/tests/coordinator/Cargo.toml
+++ b/tests/coordinator/Cargo.toml
@@ -22,7 +22,7 @@ hex = "0.4"
 zeroize = { version = "1", default-features = false }
 rand_core = { version = "0.6", default-features = false }

-blake2 = "0.10"
+blake2 = "0.11.0-rc.0"

 ciphersuite = { path = "../../crypto/ciphersuite", default-features = false, features = ["std"] }
 ciphersuite-kp256 = { path = "../../crypto/ciphersuite/kp256", default-features = false, features = ["std"] }