Ecdsa.secret: def of bend-collections@1.0.0.0
Import: import bend-collections@1.0.0.0/src/crypto/secp256k1/ecdsa.bend as Ecdsa
Lines 135-138 of bend-collections@1.0.0.0/src/crypto/secp256k1/ecdsa.bend: https://jend.leeeet.dev/read.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/ecdsa.bend&start_line=135&end_line=138

import Base
import bend-collections@1.0.0.0/src/crypto/secp256k1/bytes.bend as B

# the secret key d, when 1 <= d < n
def secret(+sk: List<&2, U32>) -> Maybe<&2, List<&2, Nat>>:
  +d = B.of_be(sk)
  secret_if(d, Bool.and(B.has_len(32n, sk), scalar_ok(d)))

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/bytes.bend&name=has_len
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/bytes.bend&name=of_be
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/ecdsa.bend&name=scalar_ok
  https://jend.leeeet.dev/definition.txt?path=bend-collections@1.0.0.0/src/crypto/secp256k1/ecdsa.bend&name=secret_if