Structure

P256K.Signing.ECDSASignature

64-byte secp256k1 ECDSA signature in libsecp256k1 internal format, convertible to and from DER (variable-length, up to 72 bytes) and compact (exactly 64 bytes) representations.

iOS 13.0+
macCatalyst 13.0+
macOS 10.15+
tvOS 13.0+
visionOS 1.0+
watchOS 6.0+

struct ECDSASignature

Mentioned In

Overview

All signatures produced by the signature(for:) overloads on P256K.Signing.PrivateKey are automatically normalized to lower-S form by secp256k1_ecdsa_sign per BIP-146. This normalization is required because secp256k1_ecdsa_verify only accepts lower-S signatures; a non-normalized signature will always fail verification.

The internal 64-byte data buffer is the opaque secp256k1_ecdsa_signature struct body declared in Vendor/secp256k1/include/secp256k1.h. Its byte layout is not a stable wire format across libsecp256k1 versions — use compactRepresentation or derRepresentation for persistence / transmission.

Topics

Construction

init<D>(dataRepresentation: D) throws
Creates an P256K.Signing.ECDSASignature from a 64-byte raw representation.
init<D>(compactRepresentation: D) throws
Creates an P256K.Signing.ECDSASignature by parsing a 64-byte compact representation via secp256k1_ecdsa_signature_parse_compact.
init<D>(derRepresentation: D) throws
Creates an P256K.Signing.ECDSASignature by parsing a DER-encoded ECDSA signature via secp256k1_ecdsa_signature_parse_der.

Serialized Forms

Instance Properties

var dataRepresentation: Data
The 64-byte opaque secp256k1_ecdsa_signature struct buffer.

Instance Methods

func withUnsafeBytes<R>((UnsafeRawBufferPointer) throws -> R) rethrows -> R
Calls body with an unsafe pointer to the signature’s raw bytes.