Module: Ciri::Crypto
- Extended by:
- Crypto
- Included in:
- Crypto
- Defined in:
- lib/ciri/crypto.rb,
lib/ciri/crypto/errors.rb,
lib/ciri/crypto/version.rb,
lib/ciri/crypto/signature.rb
Defined Under Namespace
Classes: ECDSASignatureError, ECIESDecryptionError, Error, Signature
Constant Summary
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- ECIES_CIPHER_NAME =
'aes-128-ctr'
- VERSION =
"0.1.0"
- SECP256K1N =
115792089237316195423570985008687907852837564279074904382605163141518161494337
Instance Method Summary
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Instance Method Details
#ecdsa_recover(msg, signature, return_raw_key: true) ⇒ Object
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# File 'lib/ciri/crypto.rb', line 47
def ecdsa_recover(msg, signature, return_raw_key: true)
signature = Signature.new(signature: signature) unless signature.is_a?(Signature)
pk = Secp256k1::PrivateKey.new(flags: Secp256k1::ALL_FLAGS)
sig, recid = signature.signature[0..-2], signature.v
recsig = pk.ecdsa_recoverable_deserialize(sig, recid % 4)
pubkey = pk.ecdsa_recover(msg, recsig, raw: true)
key = Secp256k1::PublicKey.new(pubkey: pubkey)
return_raw_key ? key.serialize(compressed: false) : key
rescue Secp256k1::AssertError => e
raise ECDSASignatureError.new(e)
end
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#ecdsa_signature(key, data) ⇒ Object
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# File 'lib/ciri/crypto.rb', line 41
def ecdsa_signature(key, data)
secp256k1_key = ensure_secp256k1_key(privkey: key)
signature, recid = secp256k1_key.ecdsa_recoverable_serialize(secp256k1_key.ecdsa_sign_recoverable(data, raw: true))
Signature.new(signature: signature + Ciri::Utils.big_endian_encode(recid, "\x00".b))
end
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#ecies_decrypt(data, priv_key, shared_mac_data = '') ⇒ Object
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# File 'lib/ciri/crypto.rb', line 84
def ecies_decrypt(data, priv_key, shared_mac_data = '')
raise ECIESDecryptionError.new('invalid header') if data[0] != "\x04"
ephem_raw_pubkey = data[0..64]
ephem_pubkey = ec_pkey_from_raw(ephem_raw_pubkey)
shared_secret = priv_key.dh_compute_key(ephem_pubkey.public_key)
key = ecies_kdf(shared_secret, 32)
key_enc, key_mac = key[0...16], key[16..-1]
key_mac = Digest::SHA256.digest(key_mac)
tag = data[-32..-1]
unless Ciri::Utils.secret_compare(hmac_sha256(key_mac, data[65...-32] + shared_mac_data), tag)
raise ECIESDecryptionError.new("Fail to verify data")
end
cipher = OpenSSL::Cipher.new(ECIES_CIPHER_NAME)
iv_start = 65
iv_end = iv_start + cipher.iv_len
iv = data[iv_start...iv_end]
ciphertext = data[iv_end...-32]
cipher.decrypt
cipher.key = key_enc
cipher.iv = iv
cipher.update(ciphertext) + cipher.final
end
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#ecies_encrypt(message, raw_pubkey, shared_mac_data = '') ⇒ Object
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# File 'lib/ciri/crypto.rb', line 61
def ecies_encrypt(message, raw_pubkey, shared_mac_data = '')
pubkey = raw_pubkey.is_a?(OpenSSL::PKey::EC) ? raw_pubkey : ec_pkey_from_raw(raw_pubkey)
ephem_key = OpenSSL::PKey::EC.new('secp256k1')
ephem_key.generate_key
shared_secret = ephem_key.dh_compute_key(pubkey.public_key)
key = ecies_kdf(shared_secret, 32)
key_enc, key_mac = key[0...16], key[16..-1]
key_mac = Digest::SHA256.digest(key_mac)
ephem_raw_pubkey = ephem_key.public_key.to_bn.to_s(2)
cipher = OpenSSL::Cipher.new(ECIES_CIPHER_NAME)
cipher.encrypt
iv = cipher.random_iv
cipher.key = key_enc
cipher_text = cipher.update(message) + cipher.final
msg = ephem_raw_pubkey + iv + cipher_text
tag = hmac_sha256(key_mac, msg[ephem_raw_pubkey.size..-1] + shared_mac_data)
msg + tag
end
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#ensure_secp256k1_key(privkey:) ⇒ Object
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# File 'lib/ciri/crypto.rb', line 117
def ensure_secp256k1_key(privkey:)
privkey.is_a?(Secp256k1::BaseKey) ? privkey : Secp256k1::PrivateKey.new(privkey: privkey)
end
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