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from __future__ import (
absolute_import,
)
from privacypass import (
BatchDLEQProof,
PublicKey,
)
def make_passes(signing_key, for_message, random_tokens):
blinded_tokens = list(
token.blind()
for token
in random_tokens
)
signatures = list(
signing_key.sign(blinded_token)
for blinded_token
in blinded_tokens
)
proof = BatchDLEQProof.create(
signing_key,
blinded_tokens,
signatures,
)
unblinded_signatures = proof.invalid_or_unblind(
random_tokens,
blinded_tokens,
signatures,
PublicKey.from_signing_key(signing_key),
)
preimages = list(
unblinded_signature.preimage()
for unblinded_signature
in unblinded_signatures
)
verification_keys = list(
unblinded_signature.derive_verification_key_sha512()
for unblinded_signature
in unblinded_signatures
)
message_signatures = list(
verification_key.sign_sha512(for_message.encode("utf-8"))
for verification_key
in verification_keys
)
passes = list(
u"{} {}".format(
preimage.encode_base64().decode("ascii"),
signature.encode_base64().decode("ascii"),
).encode("ascii")
for (preimage, signature)
in zip(preimages, message_signatures)
)
return passes