main_impl.h File Reference

#include "../../../include/secp256k1.h"
#include "../../../include/secp256k1_extrakeys.h"
#include "../../util.h"

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Functions
static SECP256K1_INLINE int	secp256k1_xonly_pubkey_load (const secp256k1_context *ctx, secp256k1_ge *ge, const secp256k1_xonly_pubkey *pubkey)
static SECP256K1_INLINE void	secp256k1_xonly_pubkey_save (secp256k1_xonly_pubkey *pubkey, secp256k1_ge *ge)
int	secp256k1_xonly_pubkey_parse (const secp256k1_context *ctx, secp256k1_xonly_pubkey *pubkey, const unsigned char *input32)
	Parse a 32-byte sequence into a xonly_pubkey object. More...
int	secp256k1_xonly_pubkey_serialize (const secp256k1_context *ctx, unsigned char *output32, const secp256k1_xonly_pubkey *pubkey)
	Serialize an xonly_pubkey object into a 32-byte sequence. More...
int	secp256k1_xonly_pubkey_cmp (const secp256k1_context *ctx, const secp256k1_xonly_pubkey *pk0, const secp256k1_xonly_pubkey *pk1)
	Compare two x-only public keys using lexicographic order. More...
static int	secp256k1_extrakeys_ge_even_y (secp256k1_ge *r)
	Keeps a group element as is if it has an even Y and otherwise negates it. More...
int	secp256k1_xonly_pubkey_from_pubkey (const secp256k1_context *ctx, secp256k1_xonly_pubkey *xonly_pubkey, int *pk_parity, const secp256k1_pubkey *pubkey)
	Converts a secp256k1_pubkey into a secp256k1_xonly_pubkey. More...
int	secp256k1_xonly_pubkey_tweak_add (const secp256k1_context *ctx, secp256k1_pubkey *output_pubkey, const secp256k1_xonly_pubkey *internal_pubkey, const unsigned char *tweak32)
	Tweak an x-only public key by adding the generator multiplied with tweak32 to it. More...
int	secp256k1_xonly_pubkey_tweak_add_check (const secp256k1_context *ctx, const unsigned char *tweaked_pubkey32, int tweaked_pk_parity, const secp256k1_xonly_pubkey *internal_pubkey, const unsigned char *tweak32)
	Checks that a tweaked pubkey is the result of calling secp256k1_xonly_pubkey_tweak_add with internal_pubkey and tweak32. More...
static void	secp256k1_keypair_save (secp256k1_keypair *keypair, const secp256k1_scalar *sk, secp256k1_ge *pk)
static int	secp256k1_keypair_seckey_load (const secp256k1_context *ctx, secp256k1_scalar *sk, const secp256k1_keypair *keypair)
static int	secp256k1_keypair_load (const secp256k1_context *ctx, secp256k1_scalar *sk, secp256k1_ge *pk, const secp256k1_keypair *keypair)
int	secp256k1_keypair_create (const secp256k1_context *ctx, secp256k1_keypair *keypair, const unsigned char *seckey32)
	Compute the keypair for a valid secret key. More...
int	secp256k1_keypair_sec (const secp256k1_context *ctx, unsigned char *seckey, const secp256k1_keypair *keypair)
	Get the secret key from a keypair. More...
int	secp256k1_keypair_pub (const secp256k1_context *ctx, secp256k1_pubkey *pubkey, const secp256k1_keypair *keypair)
	Get the public key from a keypair. More...
int	secp256k1_keypair_xonly_pub (const secp256k1_context *ctx, secp256k1_xonly_pubkey *pubkey, int *pk_parity, const secp256k1_keypair *keypair)
	Get the x-only public key from a keypair. More...
int	secp256k1_keypair_xonly_tweak_add (const secp256k1_context *ctx, secp256k1_keypair *keypair, const unsigned char *tweak32)
	Tweak a keypair by adding tweak32 to the secret key and updating the public key accordingly. More...

Function Documentation

secp256k1_extrakeys_ge_even_y()

static int secp256k1_extrakeys_ge_even_y ( secp256k1_ge *  r )

static

Keeps a group element as is if it has an even Y and otherwise negates it.

y_parity is set to 0 in the former case and to 1 in the latter case. Requires that the coordinates of r are normalized.

Definition at line 88 of file main_impl.h.

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secp256k1_keypair_create()

int secp256k1_keypair_create	(	const secp256k1_context *	ctx,
		secp256k1_keypair *	keypair,
		const unsigned char *	seckey
	)

Compute the keypair for a valid secret key.

See the documentation of secp256k1_ec_seckey_verify for more information about the validity of secret keys.

Returns: 1: secret key is valid 0: secret key is invalid Args: ctx: pointer to a context object (not secp256k1_context_static). Out: keypair: pointer to the created keypair. In: seckey: pointer to a 32-byte secret key.

Definition at line 196 of file main_impl.h.

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secp256k1_keypair_load()

static int secp256k1_keypair_load ( const secp256k1_context *  ctx, secp256k1_scalar *  sk, secp256k1_ge *  pk, const secp256k1_keypair *  keypair  )

static

Definition at line 176 of file main_impl.h.

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secp256k1_keypair_pub()

int secp256k1_keypair_pub	(	const secp256k1_context *	ctx,
		secp256k1_pubkey *	pubkey,
		const secp256k1_keypair *	keypair
	)

Get the public key from a keypair.

Returns: 1 always. Args: ctx: pointer to a context object. Out: pubkey: pointer to a pubkey object, set to the keypair public key. In: keypair: pointer to a keypair.

Definition at line 224 of file main_impl.h.

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secp256k1_keypair_save()

static void secp256k1_keypair_save ( secp256k1_keypair *  keypair, const secp256k1_scalar *  sk, secp256k1_ge *  pk  )

static

Definition at line 156 of file main_impl.h.

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secp256k1_keypair_sec()

int secp256k1_keypair_sec	(	const secp256k1_context *	ctx,
		unsigned char *	seckey,
		const secp256k1_keypair *	keypair
	)

Get the secret key from a keypair.

Returns: 1 always. Args: ctx: pointer to a context object. Out: seckey: pointer to a 32-byte buffer for the secret key. In: keypair: pointer to a keypair.

Definition at line 214 of file main_impl.h.

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secp256k1_keypair_seckey_load()

static int secp256k1_keypair_seckey_load ( const secp256k1_context *  ctx, secp256k1_scalar *  sk, const secp256k1_keypair *  keypair  )

static

Definition at line 162 of file main_impl.h.

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secp256k1_keypair_xonly_pub()

int secp256k1_keypair_xonly_pub	(	const secp256k1_context *	ctx,
		secp256k1_xonly_pubkey *	pubkey,
		int *	pk_parity,
		const secp256k1_keypair *	keypair
	)

Get the x-only public key from a keypair.

This is the same as calling secp256k1_keypair_pub and then secp256k1_xonly_pubkey_from_pubkey.

Returns: 1 always. Args: ctx: pointer to a context object. Out: pubkey: pointer to an xonly_pubkey object, set to the keypair public key after converting it to an xonly_pubkey. pk_parity: Ignored if NULL. Otherwise, pointer to an integer that will be set to the pk_parity argument of secp256k1_xonly_pubkey_from_pubkey. In: keypair: pointer to a keypair.

Definition at line 234 of file main_impl.h.

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secp256k1_keypair_xonly_tweak_add()

int secp256k1_keypair_xonly_tweak_add	(	const secp256k1_context *	ctx,
		secp256k1_keypair *	keypair,
		const unsigned char *	tweak32
	)

Tweak a keypair by adding tweak32 to the secret key and updating the public key accordingly.

Calling this function and then secp256k1_keypair_pub results in the same public key as calling secp256k1_keypair_xonly_pub and then secp256k1_xonly_pubkey_tweak_add.

Returns: 0 if the arguments are invalid or the resulting keypair would be invalid (only when the tweak is the negation of the keypair's secret key). 1 otherwise.

Args: ctx: pointer to a context object. In/Out: keypair: pointer to a keypair to apply the tweak to. Will be set to an invalid value if this function returns 0. In: tweak32: pointer to a 32-byte tweak, which must be valid according to secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly random 32-byte tweaks, the chance of being invalid is negligible (around 1 in 2^128).

Definition at line 255 of file main_impl.h.

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secp256k1_xonly_pubkey_cmp()

int secp256k1_xonly_pubkey_cmp	(	const secp256k1_context *	ctx,
		const secp256k1_xonly_pubkey *	pk1,
		const secp256k1_xonly_pubkey *	pk2
	)

Compare two x-only public keys using lexicographic order.

Returns: <0 if the first public key is less than the second >0 if the first public key is greater than the second 0 if the two public keys are equal Args: ctx: pointer to a context object. In: pubkey1: first public key to compare pubkey2: second public key to compare

Definition at line 59 of file main_impl.h.

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secp256k1_xonly_pubkey_from_pubkey()

int secp256k1_xonly_pubkey_from_pubkey	(	const secp256k1_context *	ctx,
		secp256k1_xonly_pubkey *	xonly_pubkey,
		int *	pk_parity,
		const secp256k1_pubkey *	pubkey
	)

Converts a secp256k1_pubkey into a secp256k1_xonly_pubkey.

Returns: 1 always.

Args: ctx: pointer to a context object. Out: xonly_pubkey: pointer to an x-only public key object for placing the converted public key. pk_parity: Ignored if NULL. Otherwise, pointer to an integer that will be set to 1 if the point encoded by xonly_pubkey is the negation of the pubkey and set to 0 otherwise. In: pubkey: pointer to a public key that is converted.

Definition at line 99 of file main_impl.h.

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secp256k1_xonly_pubkey_load()

static SECP256K1_INLINE int secp256k1_xonly_pubkey_load ( const secp256k1_context *  ctx, secp256k1_ge *  ge, const secp256k1_xonly_pubkey *  pubkey  )

static

Definition at line 14 of file main_impl.h.

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secp256k1_xonly_pubkey_parse()

int secp256k1_xonly_pubkey_parse	(	const secp256k1_context *	ctx,
		secp256k1_xonly_pubkey *	pubkey,
		const unsigned char *	input32
	)

Parse a 32-byte sequence into a xonly_pubkey object.

Returns: 1 if the public key was fully valid. 0 if the public key could not be parsed or is invalid.

Args: ctx: pointer to a context object. Out: pubkey: pointer to a pubkey object. If 1 is returned, it is set to a parsed version of input. If not, it's set to an invalid value. In: input32: pointer to a serialized xonly_pubkey.

Definition at line 22 of file main_impl.h.

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secp256k1_xonly_pubkey_save()

static SECP256K1_INLINE void secp256k1_xonly_pubkey_save ( secp256k1_xonly_pubkey *  pubkey, secp256k1_ge *  ge  )

static

Definition at line 18 of file main_impl.h.

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secp256k1_xonly_pubkey_serialize()

int secp256k1_xonly_pubkey_serialize	(	const secp256k1_context *	ctx,
		unsigned char *	output32,
		const secp256k1_xonly_pubkey *	pubkey
	)

Serialize an xonly_pubkey object into a 32-byte sequence.

Returns: 1 always.

Args: ctx: pointer to a context object. Out: output32: pointer to a 32-byte array to place the serialized key in. In: pubkey: pointer to a secp256k1_xonly_pubkey containing an initialized public key.

Definition at line 44 of file main_impl.h.

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secp256k1_xonly_pubkey_tweak_add()

int secp256k1_xonly_pubkey_tweak_add	(	const secp256k1_context *	ctx,
		secp256k1_pubkey *	output_pubkey,
		const secp256k1_xonly_pubkey *	internal_pubkey,
		const unsigned char *	tweak32
	)

Tweak an x-only public key by adding the generator multiplied with tweak32 to it.

Note that the resulting point can not in general be represented by an x-only pubkey because it may have an odd Y coordinate. Instead, the output_pubkey is a normal secp256k1_pubkey.

Returns: 0 if the arguments are invalid or the resulting public key would be invalid (only when the tweak is the negation of the corresponding secret key). 1 otherwise.

Args: ctx: pointer to a context object. Out: output_pubkey: pointer to a public key to store the result. Will be set to an invalid value if this function returns 0. In: internal_pubkey: pointer to an x-only pubkey to apply the tweak to. tweak32: pointer to a 32-byte tweak, which must be valid according to secp256k1_ec_seckey_verify or 32 zero bytes. For uniformly random 32-byte tweaks, the chance of being invalid is negligible (around 1 in 2^128).

Definition at line 118 of file main_impl.h.

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secp256k1_xonly_pubkey_tweak_add_check()

int secp256k1_xonly_pubkey_tweak_add_check	(	const secp256k1_context *	ctx,
		const unsigned char *	tweaked_pubkey32,
		int	tweaked_pk_parity,
		const secp256k1_xonly_pubkey *	internal_pubkey,
		const unsigned char *	tweak32
	)

Checks that a tweaked pubkey is the result of calling secp256k1_xonly_pubkey_tweak_add with internal_pubkey and tweak32.

The tweaked pubkey is represented by its 32-byte x-only serialization and its pk_parity, which can both be obtained by converting the result of tweak_add to a secp256k1_xonly_pubkey.

Note that this alone does not verify that the tweaked pubkey is a commitment. If the tweak is not chosen in a specific way, the tweaked pubkey can easily be the result of a different internal_pubkey and tweak.

Returns: 0 if the arguments are invalid or the tweaked pubkey is not the result of tweaking the internal_pubkey with tweak32. 1 otherwise. Args: ctx: pointer to a context object. In: tweaked_pubkey32: pointer to a serialized xonly_pubkey. tweaked_pk_parity: the parity of the tweaked pubkey (whose serialization is passed in as tweaked_pubkey32). This must match the pk_parity value that is returned when calling secp256k1_xonly_pubkey with the tweaked pubkey, or this function will fail. internal_pubkey: pointer to an x-only public key object to apply the tweak to. tweak32: pointer to a 32-byte tweak.

Definition at line 135 of file main_impl.h.

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