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package weistrass_tools
import secec "core:crypto/_weierstrass"
import "core:fmt"
import path "core:path/filepath"
import "core:os"
import "core:strings"
// Yes this leaks memory, fite me IRL.
GENERATED :: `/*
------ GENERATED ------ DO NOT EDIT ------ GENERATED ------ DO NOT EDIT ------ GENERATED ------
*/`
main :: proc() {
gen_tables("p256r1")
gen_tables("p384r1")
}
gen_tables :: proc($CURVE: string) {
when CURVE == "p256r1" {
Affine_Point_p256r1 :: struct {
x: secec.Field_Element_p256r1,
y: secec.Field_Element_p256r1,
}
Multiply_Table_hi: [32][15]Affine_Point_p256r1
Multiply_Table_lo: [32][15]Affine_Point_p256r1
SC_LEN :: 32
g, p: secec.Point_p256r1
} else when CURVE == "p384r1" {
Affine_Point_p384r1 :: struct {
x: secec.Field_Element_p384r1,
y: secec.Field_Element_p384r1,
}
Multiply_Table_hi: [48][15]Affine_Point_p384r1
Multiply_Table_lo: [48][15]Affine_Point_p384r1
SC_LEN :: 48
g, p: secec.Point_p384r1
} else {
#panic("weistrass/tools: invalid curve")
}
secec.pt_generator(&g)
// Precompute ([1,15] << n) * G multiples of G, MSB->LSB
for i in 0..<SC_LEN {
b: [SC_LEN]byte
for j in 1..<16 {
b[i] = u8(j) << 4
secec.pt_scalar_mul_bytes(&p, &g, b[:], true)
secec.pt_rescale(&p, &p)
secec.fe_set(&Multiply_Table_hi[i][j-1].x, &p.x)
secec.fe_set(&Multiply_Table_hi[i][j-1].y, &p.y)
b[i] = u8(j)
secec.pt_scalar_mul_bytes(&p, &g, b[:], true)
secec.pt_rescale(&p, &p)
secec.fe_set(&Multiply_Table_lo[i][j-1].x, &p.x)
secec.fe_set(&Multiply_Table_lo[i][j-1].y, &p.y)
b[i] = 0
}
}
fn_ := "sec" + CURVE + "_table.odin"
fn := path.join({ODIN_ROOT, "core", "crypto", "_weierstrass", fn_})
bld: strings.Builder
w := strings.to_writer(&bld)
fmt.wprintln(w, "package _weierstrass")
fmt.wprintln(w, "")
fmt.wprintln(w, GENERATED)
fmt.wprintln(w, "")
fmt.wprintln(w, "import \"core:crypto\"")
fmt.wprintln(w, "")
fmt.wprintln(w, "when crypto.COMPACT_IMPLS == false {")
fmt.wprintln(w, "\t@(private,rodata)")
fmt.wprintf(w, "\tGen_Multiply_Table_%s_hi := [%d][15]Affine_Point_%s {{\n", CURVE, SC_LEN, CURVE)
for &v, i in Multiply_Table_hi {
fmt.wprintln(w, "\t\t{")
for &ap, j in v {
fmt.wprintln(w, "\t\t\t{")
x, y := &ap.x, &ap.y
when CURVE == "p256r1" {
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d},\n", x[0], x[1], x[2], x[3])
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d},\n", y[0], y[1], y[2], y[3])
} else when CURVE == "p384r1" {
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d, %d, %d},\n", x[0], x[1], x[2], x[3], x[4], x[5])
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d, %d, %d},\n", y[0], y[1], y[2], y[3], y[4], y[5])
}
fmt.wprintln(w, "\t\t\t},")
}
fmt.wprintln(w, "\t\t},")
}
fmt.wprintln(w, "\t}\n")
fmt.wprintln(w, "\t@(private,rodata)")
fmt.wprintf(w, "\tGen_Multiply_Table_%s_lo := [%d][15]Affine_Point_%s {{\n", CURVE, SC_LEN, CURVE)
for &v, i in Multiply_Table_lo {
fmt.wprintln(w, "\t\t{")
for &ap, j in v {
fmt.wprintln(w, "\t\t\t{")
x, y := &ap.x, &ap.y
when CURVE == "p256r1" {
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d},\n", x[0], x[1], x[2], x[3])
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d},\n", y[0], y[1], y[2], y[3])
} else when CURVE == "p384r1" {
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d, %d, %d},\n", x[0], x[1], x[2], x[3], x[4], x[5])
fmt.wprintf(w, "\t\t\t\t{{%d, %d, %d, %d, %d, %d},\n", y[0], y[1], y[2], y[3], y[4], y[5])
}
fmt.wprintln(w, "\t\t\t},")
}
fmt.wprintln(w, "\t\t},")
}
fmt.wprintln(w, "\t}")
fmt.wprintln(w, "}")
_ = os.write_entire_file(fn, transmute([]byte)(strings.to_string(bld)))
}
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