ECDSA
scrypt-ts-opcat / crypto / ECDSA
Class: ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:7
Creates an ECDSA instance.
Param
Optional object containing properties to initialize the instance.
Constructors
new ECDSA()
new ECDSA(
obj?):ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:14
Creates an ECDSA instance.
Parameters
obj?
any
Optional object containing properties to initialize the instance.
Returns
Properties
endian
endian:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:37
hashbuf
hashbuf:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:36
k
k:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:41
privkey
privkey:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:38
pubkey
pubkey:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:39
sig
sig:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:40
verified
verified:
any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:42
Methods
_findSignature()
_findSignature(
d,e):any
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:104
Finds a valid ECDSA signature (r, s) for the given private key d and message hash e.
Uses deterministic k-value generation if initial attempts fail.
Parameters
d
Private key as a big number.
e
Message hash as a big number.
Returns
any
Signature object with properties r and s (big numbers).
Throws
Will throw if unable to find valid signature after multiple attempts.
calci()
calci():
ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:55
Calculates the recovery factor (i) for ECDSA signature verification. Iterates through possible recovery factors (0-3) to find the one that reconstructs the correct public key from the signature.
Returns
Returns the instance with updated signature properties if successful.
Throws
Throws if no valid recovery factor is found after all iterations.
deterministicK()
deterministicK(
badrs?):ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:70
Generates a deterministic K value for ECDSA signing as per RFC 6979. See: https://tools.ietf.org/html/rfc6979#section-3.2 Handles invalid r/s cases by incrementing badrs counter and regenerating K.
Parameters
badrs?
number
Counter for invalid r/s cases (default: 0)
Returns
Returns the ECDSA instance for chaining
privkey2pubkey()
privkey2pubkey():
void
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:46
Converts the private key to a public key and stores it in the pubkey property.
Returns
void
randomK()
randomK():
this
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:61
Generates a random value k for ECDSA signing.
The value is generated within the range (0, N) where N is the curve order.
The generated k is stored in the instance and returned for chaining.
Returns
this
set()
set(
obj):ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:27
Updates the ECDSA instance properties with provided values.
Parameters
obj
Object containing properties to update
endian?
string
Endianness of hashbuf
hashbuf?
Buffer
Hash buffer
k?
Uint8Array
Random number k
privkey?
PrivateKey
Private key
pubkey?
Public key (derived from privkey if not provided)
sig?
Signature
verified?
boolean
Verification status
Returns
Returns the updated ECDSA instance
sigError()
sigError():
string|boolean
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:94
Validates an ECDSA signature and returns an error message if invalid. Checks:
- hashbuf is a 32-byte buffer
- r and s values are within valid range
- Signature verification against public key
Returns
string | boolean
Error message if invalid, false if valid
sign()
sign():
ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:113
Signs a message using ECDSA.
Returns
Returns the instance for chaining.
Throws
Throws if parameters are invalid or hashbuf is not a 32-byte buffer.
signRandomK()
signRandomK():
ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:119
Signs the message using a randomly generated k value.
Returns
The signature object containing r and s values.
toPublicKey()
toPublicKey():
PublicKey
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:85
Converts an ECDSA signature to its corresponding public key.
The method follows the ECDSA public key recovery process:
- Validates the recovery parameter
i(must be 0-3) - Derives the public key point Q using the formula: Q = r⁻¹(sR - eG)
- Validates the derived curve point
see: https://bitcointalk.org/index.php?topic=6430.0 http://stackoverflow.com/questions/19665491/how-do-i-get-an-ecdsa-public-key-from-just-a-bitcoin-signature-sec1-4-1-6-k
Returns
The recovered public key
Throws
If recovery parameter is invalid or derived point is invalid
toString()
toString():
string
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:126
Converts the ECDSA instance to a JSON string representation. Includes hash buffer, private key, public key, signature, and k value if present. Each property is converted to a string format (hex for hashbuf, toString() for others).
Returns
string
JSON string containing the ECDSA instance properties
verify()
verify():
ECDSA
Defined in: node_modules/@opcat-labs/opcat/types/crypto/ecdsa.d.cts:131
Verifies the ECDSA signature and updates the verified property.
Returns
The current instance for chaining.