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118cd8210f
The use of static makes this somewhat redundant currently, though if we later have multiple compilation units it will be needed. This also sets the dllexport needed for shared libraries on win32.
174 lines
8.1 KiB
C
174 lines
8.1 KiB
C
#ifndef _SECP256K1_SCHNORR_
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# define _SECP256K1_SCHNORR_
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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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/** Create a signature using a custom EC-Schnorr-SHA256 construction. It
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* produces non-malleable 64-byte signatures which support public key recovery
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* batch validation, and multiparty signing.
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* Returns: 1: signature created
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* 0: the nonce generation function failed, or the private key was
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* invalid.
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* Args: ctx: pointer to a context object, initialized for signing
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* (cannot be NULL)
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* Out: sig64: pointer to a 64-byte array where the signature will be
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* 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,
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* secp256k1_nonce_function_default is used
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* ndata: pointer to arbitrary data used by the nonce generation
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* function (can be NULL)
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*/
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SECP256K1_API int secp256k1_schnorr_sign(
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const secp256k1_context* ctx,
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unsigned char *sig64,
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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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/** Verify a signature created by secp256k1_schnorr_sign.
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* Returns: 1: correct signature
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* 0: incorrect signature
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* Args: ctx: a secp256k1 context object, initialized for verification.
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* In: sig64: the 64-byte signature being verified (cannot be NULL)
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* msg32: the 32-byte message hash being verified (cannot be NULL)
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* pubkey: the public key to verify with (cannot be NULL)
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_verify(
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const secp256k1_context* ctx,
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const unsigned char *sig64,
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const unsigned char *msg32,
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const secp256k1_pubkey *pubkey
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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 EC public key from a Schnorr signature created using
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* secp256k1_schnorr_sign.
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* Returns: 1: public key successfully recovered (which guarantees a correct
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* signature).
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* 0: otherwise.
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* Args: ctx: pointer to a context object, initialized for
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* verification (cannot be NULL)
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* Out: pubkey: pointer to a pubkey to set to the recovered public key
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* (cannot be NULL).
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* In: sig64: signature as 64 byte array (cannot be NULL)
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* msg32: the 32-byte message hash assumed to be signed (cannot
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* be NULL)
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*/
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SECP256K1_API int secp256k1_schnorr_recover(
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const secp256k1_context* ctx,
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secp256k1_pubkey *pubkey,
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const unsigned char *sig64,
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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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/** Generate a nonce pair deterministically for use with
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* secp256k1_schnorr_partial_sign.
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* Returns: 1: valid nonce pair was generated.
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* 0: otherwise (nonce generation function failed)
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* Args: ctx: pointer to a context object, initialized for signing
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* (cannot be NULL)
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* Out: pubnonce: public side of the nonce (cannot be NULL)
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* privnonce32: private side of the nonce (32 byte) (cannot be NULL)
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* In: msg32: the 32-byte message hash assumed to be signed (cannot
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* be NULL)
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* sec32: the 32-byte private key (cannot be NULL)
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* noncefp: pointer to a nonce generation function. If NULL,
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* secp256k1_nonce_function_default is used
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* noncedata: pointer to arbitrary data used by the nonce generation
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* function (can be NULL)
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*
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* Do not use the output as a private/public key pair for signing/validation.
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*/
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SECP256K1_API int secp256k1_schnorr_generate_nonce_pair(
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const secp256k1_context* ctx,
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secp256k1_pubkey *pubnonce,
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unsigned char *privnonce32,
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const unsigned char *msg32,
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const unsigned char *sec32,
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secp256k1_nonce_function noncefp,
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const void* noncedata
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
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/** Produce a partial Schnorr signature, which can be combined using
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* secp256k1_schnorr_partial_combine, to end up with a full signature that is
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* verifiable using secp256k1_schnorr_verify.
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* Returns: 1: signature created succesfully.
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* 0: no valid signature exists with this combination of keys, nonces
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* and message (chance around 1 in 2^128)
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* -1: invalid private key, nonce, or public nonces.
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* Args: ctx: pointer to context object, initialized for signing (cannot
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* be NULL)
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* Out: sig64: pointer to 64-byte array to put partial signature in
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* In: msg32: pointer to 32-byte message to sign
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* sec32: pointer to 32-byte private key
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* pubnonce_others: pointer to pubkey containing the sum of the other's
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* nonces (see secp256k1_ec_pubkey_combine)
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* secnonce32: pointer to 32-byte array containing our nonce
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*
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* The intended procedure for creating a multiparty signature is:
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* - Each signer S[i] with private key x[i] and public key Q[i] runs
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* secp256k1_schnorr_generate_nonce_pair to produce a pair (k[i],R[i]) of
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* private/public nonces.
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* - All signers communicate their public nonces to each other (revealing your
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* private nonce can lead to discovery of your private key, so it should be
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* considered secret).
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* - All signers combine all the public nonces they received (excluding their
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* own) using secp256k1_ec_pubkey_combine to obtain an
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* Rall[i] = sum(R[0..i-1,i+1..n]).
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* - All signers produce a partial signature using
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* secp256k1_schnorr_partial_sign, passing in their own private key x[i],
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* their own private nonce k[i], and the sum of the others' public nonces
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* Rall[i].
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* - All signers communicate their partial signatures to each other.
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* - Someone combines all partial signatures using
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* secp256k1_schnorr_partial_combine, to obtain a full signature.
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* - The resulting signature is validatable using secp256k1_schnorr_verify, with
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* public key equal to the result of secp256k1_ec_pubkey_combine of the
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* signers' public keys (sum(Q[0..n])).
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*
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* Note that secp256k1_schnorr_partial_combine and secp256k1_ec_pubkey_combine
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* function take their arguments in any order, and it is possible to
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* pre-combine several inputs already with one call, and add more inputs later
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* by calling the function again (they are commutative and associative).
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_partial_sign(
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const secp256k1_context* ctx,
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unsigned char *sig64,
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const unsigned char *msg32,
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const unsigned char *sec32,
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const secp256k1_pubkey *pubnonce_others,
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const unsigned char *secnonce32
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) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4) SECP256K1_ARG_NONNULL(5) SECP256K1_ARG_NONNULL(6);
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/** Combine multiple Schnorr partial signatures.
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* Returns: 1: the passed signatures were succesfully combined.
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* 0: the resulting signature is not valid (chance of 1 in 2^256)
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* -1: some inputs were invalid, or the signatures were not created
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* using the same set of nonces
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* Args: ctx: pointer to a context object
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* Out: sig64: pointer to a 64-byte array to place the combined signature
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* (cannot be NULL)
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* In: sig64sin: pointer to an array of n pointers to 64-byte input
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* signatures
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* n: the number of signatures to combine (at least 1)
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_partial_combine(
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const secp256k1_context* ctx,
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unsigned char *sig64,
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const unsigned char * const * sig64sin,
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int n
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) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
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# ifdef __cplusplus
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}
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# endif
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#endif
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