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Add support for custom EC-Schnorr-SHA256 signatures
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,173 @@ | ||
| #ifndef _SECP256K1_SCHNORR_ | ||
| # define _SECP256K1_SCHNORR_ | ||
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| # include "secp256k1.h" | ||
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| # ifdef __cplusplus | ||
| extern "C" { | ||
| # endif | ||
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| /** Create a signature using a custom EC-Schnorr-SHA256 construction. It | ||
| * produces non-malleable 64-byte signatures which support public key recovery | ||
| * batch validation, and multiparty signing. | ||
| * Returns: 1: signature created | ||
| * 0: the nonce generation function failed, or the private key was | ||
| * invalid. | ||
| * In: ctx: pointer to a context object, initialized for signing | ||
| * (cannot be NULL) | ||
| * msg32: the 32-byte message hash being signed (cannot be NULL) | ||
| * seckey: pointer to a 32-byte secret key (cannot be NULL) | ||
| * noncefp:pointer to a nonce generation function. If NULL, | ||
| * secp256k1_nonce_function_default is used | ||
| * ndata: pointer to arbitrary data used by the nonce generation | ||
| * function (can be NULL) | ||
| * Out: sig64: pointer to a 64-byte array where the signature will be | ||
| * placed (cannot be NULL) | ||
| */ | ||
| int secp256k1_schnorr_sign( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| unsigned char *sig64, | ||
| const unsigned char *seckey, | ||
| secp256k1_nonce_function_t noncefp, | ||
| const void *ndata | ||
| ) 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. | ||
| * Returns: 1: correct signature | ||
| * 0: incorrect signature | ||
| * In: ctx: a secp256k1 context object, initialized for verification. | ||
| * msg32: the 32-byte message hash being verified (cannot be NULL) | ||
| * sig64: the 64-byte signature being verified (cannot be NULL) | ||
| * pubkey: the public key to verify with (cannot be NULL) | ||
| */ | ||
| SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_verify( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| const unsigned char *sig64, | ||
| const secp256k1_pubkey_t *pubkey | ||
| ) 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 | ||
| * secp256k1_schnorr_sign. | ||
| * Returns: 1: public key successfully recovered (which guarantees a correct | ||
| * signature). | ||
| * 0: otherwise. | ||
| * In: ctx: pointer to a context object, initialized for | ||
| * verification (cannot be NULL) | ||
| * msg32: the 32-byte message hash assumed to be signed (cannot | ||
| * be NULL) | ||
| * sig64: signature as 64 byte array (cannot be NULL) | ||
| * Out: pubkey: pointer to a pubkey to set to the recovered public key | ||
| * (cannot be NULL). | ||
| */ | ||
| int secp256k1_schnorr_recover( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| const unsigned char *sig64, | ||
| secp256k1_pubkey_t *pubkey | ||
| ) 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 | ||
| * secp256k1_schnorr_partial_sign. | ||
| * Returns: 1: valid nonce pair was generated. | ||
| * 0: otherwise (nonce generation function failed) | ||
| * In: ctx: pointer to a context object, initialized for signing | ||
| * (cannot be NULL) | ||
| * msg32: the 32-byte message hash assumed to be signed (cannot | ||
| * be NULL) | ||
| * sec32: the 32-byte private key (cannot be NULL) | ||
| * noncefp: pointer to a nonce generation function. If NULL, | ||
| * secp256k1_nonce_function_default is used | ||
| * noncedata: pointer to arbitrary data used by the nonce generation | ||
| * function (can be NULL) | ||
| * Out: pubnonce: public side of the nonce (cannot be NULL) | ||
| * privnonce32: private side of the nonce (32 byte) (cannot be NULL) | ||
| * | ||
| * Do not use the output as a private/public key pair for signing/validation. | ||
| */ | ||
| int secp256k1_schnorr_generate_nonce_pair( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| const unsigned char *sec32, | ||
| secp256k1_nonce_function_t noncefp, | ||
| const void* noncedata, | ||
| secp256k1_pubkey_t *pubnonce, | ||
| unsigned char *privnonce32 | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(6) SECP256K1_ARG_NONNULL(7); | ||
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| /** Produce a partial Schnorr signature, which can be combined using | ||
| * secp256k1_schnorr_partial_combine, to end up with a full signature that is | ||
| * verifiable using secp256k1_schnorr_verify. | ||
| * Returns: 1: signature created succesfully. | ||
| * 0: no valid signature exists with this combination of keys, nonces | ||
| * and message (chance around 1 in 2^128) | ||
| * -1: invalid private key, nonce, or public nonces. | ||
| * In: ctx: pointer to context object, initialized for signing (cannot | ||
| * be NULL) | ||
| * msg32: pointer to 32-byte message to sign | ||
| * sec32: pointer to 32-byte private key | ||
| * secnonce32: pointer to 32-byte array containing our nonce | ||
| * pubnonce_others: pointer to pubkey containing the sum of the other's | ||
| * nonces (see secp256k1_ec_pubkey_combine) | ||
| * Out: sig64: pointer to 64-byte array to put partial signature in | ||
| * | ||
| * The intended procedure for creating a multiparty signature is: | ||
| * - Each signer S[i] with private key x[i] and public key Q[i] runs | ||
| * secp256k1_schnorr_generate_nonce_pair to produce a pair (k[i],R[i]) of | ||
| * private/public nonces. | ||
| * - All signers communicate their public nonces to each other (revealing your | ||
| * private nonce can lead to discovery of your private key, so it should be | ||
| * considered secret). | ||
| * - All signers combine all the public nonces they received (excluding their | ||
| * own) using secp256k1_ec_pubkey_combine to obtain an | ||
| * Rall[i] = sum(R[0..i-1,i+1..n]). | ||
| * - All signers produce a partial signature using | ||
| * secp256k1_schnorr_partial_sign, passing in their own private key x[i], | ||
| * their own private nonce k[i], and the sum of the others' public nonces | ||
| * Rall[i]. | ||
| * - All signers communicate their partial signatures to each other. | ||
| * - Someone combines all partial signatures using | ||
| * secp256k1_schnorr_partial_combine, to obtain a full signature. | ||
| * - The resulting signature is validatable using secp256k1_schnorr_verify, with | ||
| * public key equal to the result of secp256k1_ec_pubkey_combine of the | ||
| * signers' public keys (sum(Q[0..n])). | ||
| * | ||
| * Note that secp256k1_schnorr_partial_combine and secp256k1_ec_pubkey_combine | ||
| * function take their arguments in any order, and it is possible to | ||
| * pre-combine several inputs already with one call, and add more inputs later | ||
| * by calling the function again (they are commutative and associative). | ||
| */ | ||
| SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_partial_sign( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| unsigned char *sig64, | ||
| const unsigned char *sec32, | ||
| const unsigned char *secnonce32, | ||
| const secp256k1_pubkey_t *pubnonce_others | ||
| ) 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. | ||
| * Returns: 1: the passed signatures were succesfully combined. | ||
| * 0: the resulting signature is not valid (chance of 1 in 2^256) | ||
| * -1: some inputs were invalid, or the signatures were not created | ||
| * using the same set of nonces | ||
| * In: ctx: pointer to a context object | ||
| * sig64: pointer to a 64-byte array to place the combined signature | ||
| * (cannot be NULL) | ||
| * n: the number of signatures to combine (at least 1) | ||
| * Out: sig64sin: pointer to an array of n pointers to 64-byte input | ||
| * signatures | ||
| */ | ||
| SECP256K1_WARN_UNUSED_RESULT int secp256k1_schnorr_partial_combine( | ||
| const secp256k1_context_t* ctx, | ||
| unsigned char *sig64, | ||
| int n, | ||
| const unsigned char * const * sig64sin | ||
| ) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4); | ||
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| # ifdef __cplusplus | ||
| } | ||
| # endif | ||
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| #endif |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,69 @@ | ||
| /********************************************************************** | ||
| * Copyright (c) 2014 Pieter Wuille * | ||
| * Distributed under the MIT software license, see the accompanying * | ||
| * file COPYING or http://www.opensource.org/licenses/mit-license.php.* | ||
| **********************************************************************/ | ||
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| #include <stdio.h> | ||
| #include <string.h> | ||
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| #include "include/secp256k1.h" | ||
| #include "include/secp256k1_schnorr.h" | ||
| #include "util.h" | ||
| #include "bench.h" | ||
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| typedef struct { | ||
| unsigned char key[32]; | ||
| unsigned char sig[64]; | ||
| unsigned char pubkey[33]; | ||
| int pubkeylen; | ||
| } benchmark_schnorr_sig_t; | ||
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| typedef struct { | ||
| secp256k1_context_t *ctx; | ||
| unsigned char msg[32]; | ||
| benchmark_schnorr_sig_t sigs[64]; | ||
| int numsigs; | ||
| } benchmark_schnorr_verify_t; | ||
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| static void benchmark_schnorr_init(void* arg) { | ||
| int i, k; | ||
| benchmark_schnorr_verify_t* data = (benchmark_schnorr_verify_t*)arg; | ||
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| for (i = 0; i < 32; i++) data->msg[i] = 1 + i; | ||
| for (k = 0; k < data->numsigs; k++) { | ||
| secp256k1_pubkey_t pubkey; | ||
| for (i = 0; i < 32; i++) data->sigs[k].key[i] = 33 + i + k; | ||
| secp256k1_schnorr_sign(data->ctx, data->msg, data->sigs[k].sig, data->sigs[k].key, NULL, NULL); | ||
| data->sigs[k].pubkeylen = 33; | ||
| CHECK(secp256k1_ec_pubkey_create(data->ctx, &pubkey, data->sigs[k].key)); | ||
| CHECK(secp256k1_ec_pubkey_serialize(data->ctx, data->sigs[k].pubkey, &data->sigs[k].pubkeylen, &pubkey, 1)); | ||
| } | ||
| } | ||
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| static void benchmark_schnorr_verify(void* arg) { | ||
| int i; | ||
| benchmark_schnorr_verify_t* data = (benchmark_schnorr_verify_t*)arg; | ||
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| for (i = 0; i < 20000 / data->numsigs; i++) { | ||
| secp256k1_pubkey_t pubkey; | ||
| data->sigs[0].sig[(i >> 8) % 64] ^= (i & 0xFF); | ||
| CHECK(secp256k1_ec_pubkey_parse(data->ctx, &pubkey, data->sigs[0].pubkey, data->sigs[0].pubkeylen)); | ||
| CHECK(secp256k1_schnorr_verify(data->ctx, data->msg, data->sigs[0].sig, &pubkey) == ((i & 0xFF) == 0)); | ||
| data->sigs[0].sig[(i >> 8) % 64] ^= (i & 0xFF); | ||
| } | ||
| } | ||
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| int main(void) { | ||
| benchmark_schnorr_verify_t data; | ||
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| data.ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY); | ||
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| data.numsigs = 1; | ||
| run_benchmark("schnorr_verify", benchmark_schnorr_verify, benchmark_schnorr_init, NULL, &data, 10, 20000); | ||
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| secp256k1_context_destroy(data.ctx); | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,11 @@ | ||
| include_HEADERS += include/secp256k1_schnorr.h | ||
| noinst_HEADERS += src/modules/schnorr/main_impl.h | ||
| noinst_HEADERS += src/modules/schnorr/schnorr.h | ||
| noinst_HEADERS += src/modules/schnorr/schnorr_impl.h | ||
| noinst_HEADERS += src/modules/schnorr/tests_impl.h | ||
| if USE_BENCHMARK | ||
| noinst_PROGRAMS += bench_schnorr_verify | ||
| bench_schnorr_verify_SOURCES = src/bench_schnorr_verify.c | ||
| bench_schnorr_verify_LDADD = libsecp256k1.la $(SECP_LIBS) | ||
| bench_schnorr_verify_LDFLAGS = -static | ||
| endif |
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