key.cpp File Reference

#include <key.h>
#include <crypto/common.h>
#include <crypto/hmac_sha512.h>
#include <hash.h>
#include <random.h>
#include <secp256k1.h>
#include <secp256k1_ellswift.h>
#include <secp256k1_extrakeys.h>
#include <secp256k1_recovery.h>
#include <secp256k1_schnorrsig.h>
#include <algorithm>

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Functions
int	ec_seckey_import_der (const secp256k1_context *ctx, unsigned char *out32, const unsigned char *seckey, size_t seckeylen)
	These functions are taken from the libsecp256k1 distribution and are very ugly.
int	ec_seckey_export_der (const secp256k1_context *ctx, unsigned char *seckey, size_t *seckeylen, const unsigned char *key32, bool compressed)
	This serializes to a DER encoding of the ECPrivateKey type from section C.4 of SEC 1 https://www.secg.org/sec1-v2.pdf.
bool	SigHasLowR (const secp256k1_ecdsa_signature *sig)
CKey	GenerateRandomKey (bool compressed) noexcept
std::optional< std::pair< CExtKey, KeyOriginInfo > >	DeriveExtKey (const CExtKey &ext_key, const std::vector< uint32_t > &path)
	Get extended key and origin info for a given path.
bool	ECC_InitSanityCheck ()
	Check that required EC support is available at runtime.
secp256k1_context *	GetSecp256k1SignContext ()
	Access the secp256k1 context used for signing and MuSig2 nonce generation.
static void	ECC_Start ()
	Initialize the elliptic curve support.
static void	ECC_Stop ()
	Deinitialize the elliptic curve support.

Variables
static secp256k1_context *	secp256k1_context_sign = nullptr

Function Documentation

DeriveExtKey()

std::optional< std::pair< CExtKey, KeyOriginInfo > > DeriveExtKey	(	const CExtKey &	ext_key,
		const std::vector< uint32_t > &	path
	)

Get extended key and origin info for a given path.

Parameters

[in]	ext_key	The extended private key to derive from
[in]	path	The BIP 32 path

Returns

the resulting extended private key and origin info

Definition at line 369 of file key.cpp.

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ec_seckey_export_der()

int ec_seckey_export_der	(	const secp256k1_context *	ctx,
		unsigned char *	seckey,
		size_t *	seckeylen,
		const unsigned char *	key32,
		bool	compressed
	)

This serializes to a DER encoding of the ECPrivateKey type from section C.4 of SEC 1 https://www.secg.org/sec1-v2.pdf.

The optional parameters and publicKey fields are included.

seckey must point to an output buffer of length at least CKey::SIZE bytes. seckeylen must initially be set to the size of the seckey buffer. Upon return it will be set to the number of bytes used in the buffer. key32 must point to a 32-byte raw private key.

Definition at line 97 of file key.cpp.

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ec_seckey_import_der()

int ec_seckey_import_der	(	const secp256k1_context *	ctx,
		unsigned char *	out32,
		const unsigned char *	seckey,
		size_t	seckeylen
	)

These functions are taken from the libsecp256k1 distribution and are very ugly.

This parses a format loosely based on a DER encoding of the ECPrivateKey type from section C.4 of SEC 1 https://www.secg.org/sec1-v2.pdf, with the following caveats:

• The octet-length of the SEQUENCE must be encoded as 1 or 2 octets. It is not required to be encoded as one octet if it is less than 256, as DER would require.
• The octet-length of the SEQUENCE must not be greater than the remaining length of the key encoding, but need not match it (i.e. the encoding may contain junk after the encoded SEQUENCE).
• The privateKey OCTET STRING is zero-filled on the left to 32 octets.
• Anything after the encoding of the privateKey OCTET STRING is ignored, whether or not it is validly encoded DER.

out32 must point to an output buffer of length at least 32 bytes.

Definition at line 40 of file key.cpp.

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ECC_InitSanityCheck()

bool ECC_InitSanityCheck

(

)

Check that required EC support is available at runtime.

Definition at line 437 of file key.cpp.

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ECC_Start()

static void ECC_Start ( )

static

Initialize the elliptic curve support.

May not be called twice without calling ECC_Stop first.

Definition at line 449 of file key.cpp.

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ECC_Stop()

static void ECC_Stop ( )

static

Deinitialize the elliptic curve support.

No-op if ECC_Start wasn't called first.

Definition at line 467 of file key.cpp.

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GenerateRandomKey()

CKey GenerateRandomKey ( bool  compressed )

noexcept

Definition at line 354 of file key.cpp.

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GetSecp256k1SignContext()

secp256k1_context * GetSecp256k1SignContext

(

)

Access the secp256k1 context used for signing and MuSig2 nonce generation.

Definition at line 443 of file key.cpp.

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SigHasLowR()

bool SigHasLowR

(

const secp256k1_ecdsa_signature *

sig

)

Definition at line 198 of file key.cpp.

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Variable Documentation

secp256k1_context_sign

secp256k1_context* secp256k1_context_sign = nullptr

static

Definition at line 21 of file key.cpp.