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111 lines
4.6 KiB
C
111 lines
4.6 KiB
C
#ifndef SECP256K1_RECOVERY_H
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#define SECP256K1_RECOVERY_H
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#include "secp256k1.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Opaque data structured that holds a parsed ECDSA signature,
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* supporting pubkey recovery.
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*
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* The exact representation of data inside is implementation defined and not
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* guaranteed to be portable between different platforms or versions. It is
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* however guaranteed to be 65 bytes in size, and can be safely copied/moved.
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* If you need to convert to a format suitable for storage or transmission, use
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* the secp256k1_ecdsa_signature_serialize_* and
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* secp256k1_ecdsa_signature_parse_* functions.
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*
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* Furthermore, it is guaranteed that identical signatures (including their
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* recoverability) will have identical representation, so they can be
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* memcmp'ed.
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*/
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typedef struct {
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unsigned char data[65];
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} secp256k1_ecdsa_recoverable_signature;
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/** Parse a compact ECDSA signature (64 bytes + recovery id).
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*
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* Returns: 1 when the signature could be parsed, 0 otherwise
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* Args: ctx: a secp256k1 context object
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* Out: sig: a pointer to a signature object
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* In: input64: a pointer to a 64-byte compact signature
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* recid: the recovery id (0, 1, 2 or 3)
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*/
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SECP256K1_API int secp256k1_ecdsa_recoverable_signature_parse_compact(
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const secp256k1_context* ctx,
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secp256k1_ecdsa_recoverable_signature* sig,
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const unsigned char *input64,
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int recid
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
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/** Convert a recoverable signature into a normal signature.
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*
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* Returns: 1
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* Out: sig: a pointer to a normal signature (cannot be NULL).
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* In: sigin: a pointer to a recoverable signature (cannot be NULL).
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*/
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SECP256K1_API int secp256k1_ecdsa_recoverable_signature_convert(
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const secp256k1_context* ctx,
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secp256k1_ecdsa_signature* sig,
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const secp256k1_ecdsa_recoverable_signature* sigin
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
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/** Serialize an ECDSA signature in compact format (64 bytes + recovery id).
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*
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* Returns: 1
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* Args: ctx: a secp256k1 context object
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* Out: output64: a pointer to a 64-byte array of the compact signature (cannot be NULL)
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* recid: a pointer to an integer to hold the recovery id (can be NULL).
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* In: sig: a pointer to an initialized signature object (cannot be NULL)
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*/
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SECP256K1_API int secp256k1_ecdsa_recoverable_signature_serialize_compact(
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const secp256k1_context* ctx,
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unsigned char *output64,
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int *recid,
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const secp256k1_ecdsa_recoverable_signature* sig
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
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/** Create a recoverable ECDSA signature.
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*
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* Returns: 1: signature created
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* 0: the nonce generation function failed, or the private key was invalid.
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* Args: ctx: pointer to a context object, initialized for signing (cannot be NULL)
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* Out: sig: pointer to an array where the signature will be placed (cannot be NULL)
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* In: msg32: the 32-byte message hash being signed (cannot be NULL)
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* seckey: pointer to a 32-byte secret key (cannot be NULL)
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* noncefp:pointer to a nonce generation function. If NULL, secp256k1_nonce_function_default is used
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* ndata: pointer to arbitrary data used by the nonce generation function (can be NULL)
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*/
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SECP256K1_API int secp256k1_ecdsa_sign_recoverable(
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const secp256k1_context* ctx,
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secp256k1_ecdsa_recoverable_signature *sig,
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const unsigned char *msg32,
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const unsigned char *seckey,
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secp256k1_nonce_function noncefp,
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const void *ndata
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
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/** Recover an ECDSA public key from a signature.
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*
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* Returns: 1: public key successfully recovered (which guarantees a correct signature).
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* 0: otherwise.
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* Args: ctx: pointer to a context object, initialized for verification (cannot be NULL)
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* Out: pubkey: pointer to the recovered public key (cannot be NULL)
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* In: sig: pointer to initialized signature that supports pubkey recovery (cannot be NULL)
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* msg32: the 32-byte message hash assumed to be signed (cannot be NULL)
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_recover(
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const secp256k1_context* ctx,
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secp256k1_pubkey *pubkey,
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const secp256k1_ecdsa_recoverable_signature *sig,
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const unsigned char *msg32
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SECP256K1_RECOVERY_H */
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