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core/curves/native/bls12381/bls12381.go

@@ -0,0 +1,81 @@
+package bls12381
+
+import (
+	"math/bits"
+
+	"github.com/sonr-io/sonr/crypto/core/curves/native"
+)
+
+var fqModulusBytes = [native.FieldBytes]byte{
+	0x01,
+	0x00,
+	0x00,
+	0x00,
+	0xff,
+	0xff,
+	0xff,
+	0xff,
+	0xfe,
+	0x5b,
+	0xfe,
+	0xff,
+	0x02,
+	0xa4,
+	0xbd,
+	0x53,
+	0x05,
+	0xd8,
+	0xa1,
+	0x09,
+	0x08,
+	0xd8,
+	0x39,
+	0x33,
+	0x48,
+	0x7d,
+	0x9d,
+	0x29,
+	0x53,
+	0xa7,
+	0xed,
+	0x73,
+}
+
+const (
+	// The BLS parameter x for BLS12-381 is -0xd201000000010000
+	paramX               = uint64(0xd201000000010000)
+	Limbs                = 6
+	FieldBytes           = 48
+	WideFieldBytes       = 96
+	DoubleWideFieldBytes = 192
+)
+
+// mac Multiply and Accumulate - compute a + (b * c) + d, return the result and new carry
+func mac(a, b, c, d uint64) (uint64, uint64) {
+	hi, lo := bits.Mul64(b, c)
+	carry2, carry := bits.Add64(a, d, 0)
+	hi, _ = bits.Add64(hi, 0, carry)
+	lo, carry = bits.Add64(lo, carry2, 0)
+	hi, _ = bits.Add64(hi, 0, carry)
+
+	return lo, hi
+}
+
+// adc Add w/Carry
+func adc(x, y, carry uint64) (uint64, uint64) {
+	sum := x + y + carry
+	// The sum will overflow if both top bits are set (x & y) or if one of them
+	// is (x | y), and a carry from the lower place happened. If such a carry
+	// happens, the top bit will be 1 + 0 + 1 = 0 (&^ sum).
+	carryOut := ((x & y) | ((x | y) &^ sum)) >> 63
+	carryOut |= ((x & carry) | ((x | carry) &^ sum)) >> 63
+	carryOut |= ((y & carry) | ((y | carry) &^ sum)) >> 63
+	return sum, carryOut
+}
+
+// sbb Subtract with borrow
+func sbb(x, y, borrow uint64) (uint64, uint64) {
+	diff := x - (y + borrow)
+	borrowOut := ((^x & y) | (^(x ^ y) & diff)) >> 63
+	return diff, borrowOut
+}