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b9c1a76481
8ab24e8dad Merge #558: Add schnorrsig module which implements BIP-340 compliant signatures f3733c5433 Merge #797: Fix Jacobi benchmarks and other benchmark improvements cb5524adc5 Add benchmark for secp256k1_ge_set_gej_var 5c6af60ec5 Make jacobi benchmarks vary inputs d0fdd5f009 Randomize the Z coordinates in bench_internal c7a3424c5f Rename bench_internal variables 875d68b95f Merge #699: Initialize field elements when resulting in infinity 54caf2e74f Merge #799: Add fallback LE/BE for architectures with known endianness + SHA256 selftest f431b3f28a valgrind_ctime_test: Add schnorrsig_sign 16ffa9d97c schnorrsig: Add taproot test case 8dfd53ee3f schnorrsig: Add benchmark for sign and verify 4e43520026 schnorrsig: Add BIP-340 compatible signing and verification 7332d2db6b schnorrsig: Add BIP-340 nonce function 7a703fd97d schnorrsig: Init empty experimental module eabd9bc46a Allow initializing tagged sha256 6fcb5b845d extrakeys: Add keypair_xonly_tweak_add 58254463f9 extrakeys: Add keypair struct with create, pub and pub_xonly f0010349b8 Separate helper functions for pubkey_create and seckey_tweak_add 910d9c284c extrakeys: Add xonly_pubkey_tweak_add & xonly_pubkey_tweak_add_test 176bfb1110 Separate helper function for ec_pubkey_tweak_add 4cd2ee474d extrakeys: Add xonly_pubkey with serialize, parse and from_pubkey f49c9896b0 Merge #806: Trivial: Add test logs to gitignore aabf00c155 Merge #648: Prevent ints from wrapping around in scratch space functions f5adab16a9 Merge #805: Remove the extremely outdated TODO file. bceefd6547 Add test logs to gitignore 1c325199d5 Remove the extremely outdated TODO file. 47e6618e11 extrakeys: Init empty experimental module 3e08b02e2a Make the secp256k1_declassify argument constant 8bc6aeffa9 Add SHA256 selftest 670cdd3f8b Merge #798: Check assumptions on integer implementation at compile time 5e5fb28b4a Use additional system macros to figure out endianness 7c068998ba Compile-time check assumptions on integer types 02b6c87b52 Add support for (signed) __int128 979961c506 Merge #787: Use preprocessor macros instead of autoconf to detect endianness 887bd1f8b6 Merge #793: Make scalar/field choice depend on C-detected __int128 availability 0dccf98a21 Use preprocessor macros instead of autoconf to detect endianness b2c8c42cf1 Merge #795: Avoid linking libcrypto in the valgrind ct test. 57d3a3c64c Avoid linking libcrypto in the valgrind ct test. 79f1f7a4f1 Autodetect __int128 availability on the C side 0d7727f95e Add SECP256K1_FE_STORAGE_CONST_GET to 5x52 field 805082de11 Merge #696: Run a Travis test on s390x (big endian) 39295362cf Test travis s390x (big endian) 6034a04fb1 Merge #778: secp256k1_gej_double_nonzero supports infinity f60915906d Merge #779: travis: Fix argument quoting for ./configure 9e49a9b255 travis: Fix argument quoting for ./configure 18d36327fd secp256k1_gej_double_nonzero supports infinity 214cb3c321 Merge #772: Improve constant-timeness on PowerPC 40412b1930 Merge #774: tests: Abort if malloc() fails during context cloning tests 2e1b9e0458 tests: Abort if malloc() fails during context cloning tests 67a429f31f Suppress a harmless variable-time optimization by clang in _int_cmov 5b196338f0 Remove redundant "? 1 : 0" after comparisons in scalar code 3e5cfc5c73 Merge #741: Remove unnecessary sign variable from wnaf_const 66bb9320c0 Merge #773: Fix some compile problems on weird/old compilers. 1309c03c45 Fix some compile problems on weird/old compilers. 2309c7dd4a Merge #769: Undef HAVE___INT128 in basic-config.h to fix gen_context compilation 22e578bb11 Undef HAVE___INT128 in basic-config.h to fix gen_context compilation 3f4a5a10e4 Merge #765: remove dead store in ecdsa_signature_parse_der_lax f00d6575ca remove dead store in ecdsa_signature_parse_der_lax dbd41db16a Merge #759: Fix uninitialized variables in ecmult_multi test 2e7fc5b537 Fix uninitialized variables in ecmult_multi test 37dba329c6 Remove unnecessary sign variable from wnaf_const 6bb0b77e15 Fix test_constant_wnaf for -1 and add a test for it. 47a7b8382f Clear field elements when writing infinity 61d1ecb028 Added test with additions resulting in infinity 60f7f2de5d Don't assume that ALIGNMENT > 1 in tests ada6361dec Use ROUND_TO_ALIGN in scratch_create 8ecc6ce50e Add check preventing rounding to alignment from wrapping around in scratch_alloc 4edaf06fb0 Add check preventing integer multiplication wrapping around in scratch_max_allocation git-subtree-dir: src/secp256k1 git-subtree-split: 8ab24e8dad9d43fc6661842149899e3cc9213b24
111 lines
4.8 KiB
C
111 lines
4.8 KiB
C
#ifndef SECP256K1_SCHNORRSIG_H
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#define SECP256K1_SCHNORRSIG_H
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#include "secp256k1.h"
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#include "secp256k1_extrakeys.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** This module implements a variant of Schnorr signatures compliant with
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* Bitcoin Improvement Proposal 340 "Schnorr Signatures for secp256k1"
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* (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki).
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*/
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/** A pointer to a function to deterministically generate a nonce.
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*
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* Same as secp256k1_nonce function with the exception of accepting an
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* additional pubkey argument and not requiring an attempt argument. The pubkey
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* argument can protect signature schemes with key-prefixed challenge hash
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* inputs against reusing the nonce when signing with the wrong precomputed
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* pubkey.
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*
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* Returns: 1 if a nonce was successfully generated. 0 will cause signing to
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* return an error.
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* Out: nonce32: pointer to a 32-byte array to be filled by the function.
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* In: msg32: the 32-byte message hash being verified (will not be NULL)
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* key32: pointer to a 32-byte secret key (will not be NULL)
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* xonly_pk32: the 32-byte serialized xonly pubkey corresponding to key32
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* (will not be NULL)
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* algo16: pointer to a 16-byte array describing the signature
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* algorithm (will not be NULL).
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* data: Arbitrary data pointer that is passed through.
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*
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* Except for test cases, this function should compute some cryptographic hash of
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* the message, the key, the pubkey, the algorithm description, and data.
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*/
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typedef int (*secp256k1_nonce_function_hardened)(
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unsigned char *nonce32,
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const unsigned char *msg32,
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const unsigned char *key32,
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const unsigned char *xonly_pk32,
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const unsigned char *algo16,
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void *data
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);
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/** An implementation of the nonce generation function as defined in Bitcoin
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* Improvement Proposal 340 "Schnorr Signatures for secp256k1"
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* (https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki).
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*
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* If a data pointer is passed, it is assumed to be a pointer to 32 bytes of
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* auxiliary random data as defined in BIP-340. If the data pointer is NULL,
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* schnorrsig_sign does not produce BIP-340 compliant signatures. The algo16
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* argument must be non-NULL, otherwise the function will fail and return 0.
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* The hash will be tagged with algo16 after removing all terminating null
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* bytes. Therefore, to create BIP-340 compliant signatures, algo16 must be set
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* to "BIP0340/nonce\0\0\0"
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*/
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SECP256K1_API extern const secp256k1_nonce_function_hardened secp256k1_nonce_function_bip340;
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/** Create a Schnorr signature.
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*
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* Does _not_ strictly follow BIP-340 because it does not verify the resulting
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* signature. Instead, you can manually use secp256k1_schnorrsig_verify and
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* abort if it fails.
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*
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* Otherwise BIP-340 compliant if the noncefp argument is NULL or
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* secp256k1_nonce_function_bip340 and the ndata argument is 32-byte auxiliary
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* randomness.
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*
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* Returns 1 on success, 0 on failure.
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* Args: ctx: pointer to a context object, initialized for signing (cannot be NULL)
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* Out: sig64: pointer to a 64-byte array to store the serialized signature (cannot be NULL)
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* In: msg32: the 32-byte message being signed (cannot be NULL)
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* keypair: pointer to an initialized keypair (cannot be NULL)
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* noncefp: pointer to a nonce generation function. If NULL, secp256k1_nonce_function_bip340 is used
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* ndata: pointer to arbitrary data used by the nonce generation
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* function (can be NULL). If it is non-NULL and
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* secp256k1_nonce_function_bip340 is used, then ndata must be a
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* pointer to 32-byte auxiliary randomness as per BIP-340.
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*/
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SECP256K1_API int secp256k1_schnorrsig_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 secp256k1_keypair *keypair,
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secp256k1_nonce_function_hardened noncefp,
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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 Schnorr signature.
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*
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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: pointer to the 64-byte signature to verify (cannot be NULL)
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* msg32: the 32-byte message being verified (cannot be NULL)
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* pubkey: pointer to an x-only public key to verify with (cannot be NULL)
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*/
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SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorrsig_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_xonly_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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#ifdef __cplusplus
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}
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#endif
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#endif /* SECP256K1_SCHNORRSIG_H */
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