E#i! SrSSKJr SSKJr SrSrSrSrSr \ "/S Q5r \ "/S Q5r \ "\S S/5r \ "\S S /5r\ "\ S \\"\ 5/\ Q\P\"\ 5P\ Q5rSS jrSSjrSSSjjrSSSjjrSSjrSSjrg)a Minimal, dependency-free ASN.1/DER encoder & decoder for secp256k1 EC private keys. This module implements just enough DER encoding/decoding to support: 1. Outputting a DER-encoded PKCS#8 EC private key (with an embedded ECPrivateKey per RFC 5915) 2. Reading such a DER-encoded EC private key Only the following ASN.1 types are supported: - INTEGER - BIT STRING - OCTET STRING - OBJECT IDENTIFIER - SEQUENCE - Context-specific EXPLICIT tags (for the optional public key) The expected DER structure is as follows: PrivateKeyInfo ::= SEQUENCE { version INTEGER, -- must be 0 privateKeyAlgorithm SEQUENCE { algorithm OBJECT IDENTIFIER, -- id-ecPublicKey (1.2.840.10045.2.1) parameters OBJECT IDENTIFIER -- secp256k1 (1.3.132.0.10) }, privateKey OCTET STRING -- DER encoding of ECPrivateKey } ECPrivateKey ::= SEQUENCE { version INTEGER, -- must be 1 privateKey OCTET STRING, -- the secret bytes publicKey [1] EXPLICIT BIT STRING OPTIONAL -- uncompressed public key } ) annotations) int_to_bytes0)*H=r)+rr rcrUS:a [U/5$[U5n[S[U5-/5U-$)zEncode a length in DER format.)bytesrlen)length length_bytess G/home/james-whalen/.local/lib/python3.13/site-packages/coincurve/der.py encode_lengthrBs@|fX 'L $\**+ ,| ;;c[[U55n[U5n[SU-[U5-5n[US'XSSU-&XSU-S&[ U5$)z%Encode an OCTET STRING in DER format.rrN)rr bytearrayOCTET_STRING_TAGr)valuerlength_bytes_lenresults rencode_octet_stringr#Msh U,L<( q++c%j8 9F F1I'31q##$%*1  !" =rc[[U5S-5n[U5n[SU-S-[U5-5n[US'X$SSU-&XSU-'XSU-S-S&[ U5$)z"Encode a BIT STRING in DER format.rrN)rrrBIT_STRING_TAGr)r unused_bitsrr!r"s rencode_bit_stringr'Xs Ua0L<( q++a/#e*< =FF1I'31q##$#.1  ).1 ! # %& =rNc[[5n[U5nURU5 UbR[ U5n[ U5nUR S5 UR[U55 URU5 [[/5nUR[[ U555 URU5 [U5n[[/5nS[ [5-[ U5-n UR[U 55 UR[5 UR[5 URU5 [U5$)a5 Encode an EC private key in DER format (PKCS#8/RFC 5208). Optimized for secp256k1 keys. Parameters: private_key: The private key as bytes (32 bytes for secp256k1) public_key: The public key as bytes (65 bytes uncompressed for secp256k1, starting with 0x04) Returns: The DER-encoded private key r) rVERSION_INTEGER_ONEr#extendr'rappendr SEQUENCE_TAGEC_ALGORITHM_IDENTIFIERVERSION_INTEGER_ZEROr) private_key public_key ec_key_bufferprivate_key_os public_key_bs pubkey_len ec_key_seq ec_key_osr" outer_lens r encode_derr9ds$12M)5N()*5 ' T"]:67]+L>*JmC $678m$$J/I ~ &FC/003y>AI MM- *+ MM&' MM)* MM) =rc|XnUS- nUS:aX!4$US-nSn[U5HnUS-X-nUS- nM XA4$)z Decode a DER length field. Parameters: data: The DER-encoded data offset: The current offset in the data Returns: Tuple of (length, new_offset) rrr)range)dataoffset length_bytenum_length_bytesr_s r decode_lengthrCsl,K aKFS""#T) F # $A+-! % >rcz[U5S:d US[:wa Sn[U5eSn[X5up2X[:wa Sn[U5eUS- n[X5upBX$- nX[:wa Sn[U5eUS- n[X5upRX%-nX[ :wa Sn[U5eUS- n[X5uprXX'-nU[[ 5:wd U[ :wa Sn[U5eUnX[:wa S n[U5eUS- n[X5upXX)-n [U 5S :d U S[:wa S n[U5eSn [X5up;X[:wa S n[U5eU S- n [X5upX- n X[:wa S n[U5eU S- n [X5upXX-$)z Decode a DER-encoded EC private key to extract the private key secret. Optimized for secp256k1 keys. Parameters: der_data: The DER-encoded private key in PKCS#8 format Returns: The private key secret as bytes "rz)Invalid DER: not a valid PKCS#8 structurerz-Invalid DER: expected INTEGER tag for versionz0Invalid DER: expected SEQUENCE tag for algorithmz+Invalid DER: expected OBJECT IDENTIFIER tagzNot an EC private keyz2Invalid DER: expected OCTET STRING for private keyrz'Invalid EC key format: missing sequencez&Invalid EC key format: missing versionz5Invalid DER: expected OCTET STRING for EC private key)rr- ValueErrorrC INTEGER_TAGOBJECT_IDENTIFIER_TAG EC_PUBKEY_OIDr)der_datamsgr?rB version_lenalg_lenalg_endoid_len algorithm_oidpriv_lenec_data ec_offset ec_ver_lenkey_lens r decode_derrVs 8}rXa[L89oFh/IA;&=o aKF'9K F<'@o aKF#H5OGG00;o aKF#H5OGf&67M#m$$ (F%oF++Bo aKF$X6H 12G 7|a71:57oI 4LA[(6o NI)'=J I--Eo NI&w:G y2 33r)rintreturnr)r rrXr)r)r rr&rWrXr)N)r0rr1z bytes | NonerXr)r>rr?rWrXztuple[int, int])rJrrXr)__doc__ __future__rcoincurve.utilsrrGr%rrHr-rrI SECP256K1_OIDr/r*rr.rr#r'r9rCrVrrr^s!F#(  @A 45 k467[$56  !  !  !  ! ! < 3l6Y4r