diff options
Diffstat (limited to 'crypto/secp256k1/libsecp256k1/src/modules/recovery/main_impl.h')
-rwxr-xr-x | crypto/secp256k1/libsecp256k1/src/modules/recovery/main_impl.h | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/crypto/secp256k1/libsecp256k1/src/modules/recovery/main_impl.h b/crypto/secp256k1/libsecp256k1/src/modules/recovery/main_impl.h deleted file mode 100755 index c6fbe2398..000000000 --- a/crypto/secp256k1/libsecp256k1/src/modules/recovery/main_impl.h +++ /dev/null @@ -1,193 +0,0 @@ -/********************************************************************** - * Copyright (c) 2013-2015 Pieter Wuille * - * Distributed under the MIT software license, see the accompanying * - * file COPYING or http://www.opensource.org/licenses/mit-license.php.* - **********************************************************************/ - -#ifndef _SECP256K1_MODULE_RECOVERY_MAIN_ -#define _SECP256K1_MODULE_RECOVERY_MAIN_ - -#include "include/secp256k1_recovery.h" - -static void secp256k1_ecdsa_recoverable_signature_load(const secp256k1_context* ctx, secp256k1_scalar* r, secp256k1_scalar* s, int* recid, const secp256k1_ecdsa_recoverable_signature* sig) { - (void)ctx; - if (sizeof(secp256k1_scalar) == 32) { - /* When the secp256k1_scalar type is exactly 32 byte, use its - * representation inside secp256k1_ecdsa_signature, as conversion is very fast. - * Note that secp256k1_ecdsa_signature_save must use the same representation. */ - memcpy(r, &sig->data[0], 32); - memcpy(s, &sig->data[32], 32); - } else { - secp256k1_scalar_set_b32(r, &sig->data[0], NULL); - secp256k1_scalar_set_b32(s, &sig->data[32], NULL); - } - *recid = sig->data[64]; -} - -static void secp256k1_ecdsa_recoverable_signature_save(secp256k1_ecdsa_recoverable_signature* sig, const secp256k1_scalar* r, const secp256k1_scalar* s, int recid) { - if (sizeof(secp256k1_scalar) == 32) { - memcpy(&sig->data[0], r, 32); - memcpy(&sig->data[32], s, 32); - } else { - secp256k1_scalar_get_b32(&sig->data[0], r); - secp256k1_scalar_get_b32(&sig->data[32], s); - } - sig->data[64] = recid; -} - -int secp256k1_ecdsa_recoverable_signature_parse_compact(const secp256k1_context* ctx, secp256k1_ecdsa_recoverable_signature* sig, const unsigned char *input64, int recid) { - secp256k1_scalar r, s; - int ret = 1; - int overflow = 0; - - (void)ctx; - ARG_CHECK(sig != NULL); - ARG_CHECK(input64 != NULL); - ARG_CHECK(recid >= 0 && recid <= 3); - - secp256k1_scalar_set_b32(&r, &input64[0], &overflow); - ret &= !overflow; - secp256k1_scalar_set_b32(&s, &input64[32], &overflow); - ret &= !overflow; - if (ret) { - secp256k1_ecdsa_recoverable_signature_save(sig, &r, &s, recid); - } else { - memset(sig, 0, sizeof(*sig)); - } - return ret; -} - -int secp256k1_ecdsa_recoverable_signature_serialize_compact(const secp256k1_context* ctx, unsigned char *output64, int *recid, const secp256k1_ecdsa_recoverable_signature* sig) { - secp256k1_scalar r, s; - - (void)ctx; - ARG_CHECK(output64 != NULL); - ARG_CHECK(sig != NULL); - ARG_CHECK(recid != NULL); - - secp256k1_ecdsa_recoverable_signature_load(ctx, &r, &s, recid, sig); - secp256k1_scalar_get_b32(&output64[0], &r); - secp256k1_scalar_get_b32(&output64[32], &s); - return 1; -} - -int secp256k1_ecdsa_recoverable_signature_convert(const secp256k1_context* ctx, secp256k1_ecdsa_signature* sig, const secp256k1_ecdsa_recoverable_signature* sigin) { - secp256k1_scalar r, s; - int recid; - - (void)ctx; - ARG_CHECK(sig != NULL); - ARG_CHECK(sigin != NULL); - - secp256k1_ecdsa_recoverable_signature_load(ctx, &r, &s, &recid, sigin); - secp256k1_ecdsa_signature_save(sig, &r, &s); - return 1; -} - -static int secp256k1_ecdsa_sig_recover(const secp256k1_ecmult_context *ctx, const secp256k1_scalar *sigr, const secp256k1_scalar* sigs, secp256k1_ge *pubkey, const secp256k1_scalar *message, int recid) { - unsigned char brx[32]; - secp256k1_fe fx; - secp256k1_ge x; - secp256k1_gej xj; - secp256k1_scalar rn, u1, u2; - secp256k1_gej qj; - int r; - - if (secp256k1_scalar_is_zero(sigr) || secp256k1_scalar_is_zero(sigs)) { - return 0; - } - - secp256k1_scalar_get_b32(brx, sigr); - r = secp256k1_fe_set_b32(&fx, brx); - (void)r; - VERIFY_CHECK(r); /* brx comes from a scalar, so is less than the order; certainly less than p */ - if (recid & 2) { - if (secp256k1_fe_cmp_var(&fx, &secp256k1_ecdsa_const_p_minus_order) >= 0) { - return 0; - } - secp256k1_fe_add(&fx, &secp256k1_ecdsa_const_order_as_fe); - } - if (!secp256k1_ge_set_xo_var(&x, &fx, recid & 1)) { - return 0; - } - secp256k1_gej_set_ge(&xj, &x); - secp256k1_scalar_inverse_var(&rn, sigr); - secp256k1_scalar_mul(&u1, &rn, message); - secp256k1_scalar_negate(&u1, &u1); - secp256k1_scalar_mul(&u2, &rn, sigs); - secp256k1_ecmult(ctx, &qj, &xj, &u2, &u1); - secp256k1_ge_set_gej_var(pubkey, &qj); - return !secp256k1_gej_is_infinity(&qj); -} - -int secp256k1_ecdsa_sign_recoverable(const secp256k1_context* ctx, secp256k1_ecdsa_recoverable_signature *signature, const unsigned char *msg32, const unsigned char *seckey, secp256k1_nonce_function noncefp, const void* noncedata) { - secp256k1_scalar r, s; - secp256k1_scalar sec, non, msg; - int recid; - int ret = 0; - int overflow = 0; - VERIFY_CHECK(ctx != NULL); - ARG_CHECK(secp256k1_ecmult_gen_context_is_built(&ctx->ecmult_gen_ctx)); - ARG_CHECK(msg32 != NULL); - ARG_CHECK(signature != NULL); - ARG_CHECK(seckey != NULL); - if (noncefp == NULL) { - noncefp = secp256k1_nonce_function_default; - } - - secp256k1_scalar_set_b32(&sec, seckey, &overflow); - /* Fail if the secret key is invalid. */ - if (!overflow && !secp256k1_scalar_is_zero(&sec)) { - unsigned char nonce32[32]; - unsigned int count = 0; - secp256k1_scalar_set_b32(&msg, msg32, NULL); - while (1) { - ret = noncefp(nonce32, msg32, seckey, NULL, (void*)noncedata, count); - if (!ret) { - break; - } - secp256k1_scalar_set_b32(&non, nonce32, &overflow); - if (!secp256k1_scalar_is_zero(&non) && !overflow) { - if (secp256k1_ecdsa_sig_sign(&ctx->ecmult_gen_ctx, &r, &s, &sec, &msg, &non, &recid)) { - break; - } - } - count++; - } - memset(nonce32, 0, 32); - secp256k1_scalar_clear(&msg); - secp256k1_scalar_clear(&non); - secp256k1_scalar_clear(&sec); - } - if (ret) { - secp256k1_ecdsa_recoverable_signature_save(signature, &r, &s, recid); - } else { - memset(signature, 0, sizeof(*signature)); - } - return ret; -} - -int secp256k1_ecdsa_recover(const secp256k1_context* ctx, secp256k1_pubkey *pubkey, const secp256k1_ecdsa_recoverable_signature *signature, const unsigned char *msg32) { - secp256k1_ge q; - secp256k1_scalar r, s; - secp256k1_scalar m; - int recid; - VERIFY_CHECK(ctx != NULL); - ARG_CHECK(secp256k1_ecmult_context_is_built(&ctx->ecmult_ctx)); - ARG_CHECK(msg32 != NULL); - ARG_CHECK(signature != NULL); - ARG_CHECK(pubkey != NULL); - - secp256k1_ecdsa_recoverable_signature_load(ctx, &r, &s, &recid, signature); - VERIFY_CHECK(recid >= 0 && recid < 4); /* should have been caught in parse_compact */ - secp256k1_scalar_set_b32(&m, msg32, NULL); - if (secp256k1_ecdsa_sig_recover(&ctx->ecmult_ctx, &r, &s, &q, &m, recid)) { - secp256k1_pubkey_save(pubkey, &q); - return 1; - } else { - memset(pubkey, 0, sizeof(*pubkey)); - return 0; - } -} - -#endif |