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musig: compute musig coefficient by hashing key instead of index

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This commit is contained in:
Jonas Nick
2021-03-16 23:07:58 +00:00
parent 9683c8a7eb
commit 2310849f50
4 changed files with 58 additions and 75 deletions
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7
include/secp256k1_musig.h
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@@ -94,7 +94,7 @@ typedef struct {
* The workflow for this structure is as follows:
*
* 1. This structure is initialized with `musig_session_init` or
* `musig_session_init_verifier`, which set the `index` field, and zero out
* `musig_session_init_verifier`, which initializes
* all other fields. The public session is initialized with the signers'
* nonce_commitments.
*
@@ -111,14 +111,12 @@ typedef struct {
*
* Fields:
* present: indicates whether the signer's nonce is set
* index: index of the signer in the MuSig key aggregation
* nonce: public nonce, must be a valid curvepoint if the signer is `present`
* nonce_commitment: commitment to the nonce, or all-bits zero if a commitment
* has not yet been set
*/
typedef struct {
int present;
uint32_t index;
secp256k1_xonly_pubkey nonce;
unsigned char nonce_commitment[32];
} secp256k1_musig_session_signer_data;
@@ -227,8 +225,6 @@ SECP256K1_API SECP256K1_WARN_UNUSED_RESULT int secp256k1_musig_pubkey_tweak_add(
* `musig_pubkey_tweak_add` (cannot be NULL).
* n_signers: length of signers array. Number of signers participating in
* the MuSig. Must be greater than 0 and at most 2^32 - 1.
* my_index: index of this signer in the signers array. Must be less
* than `n_signers`.
* seckey: the signer's 32-byte secret key (cannot be NULL)
*/
SECP256K1_API int secp256k1_musig_session_init(
@@ -241,7 +237,6 @@ SECP256K1_API int secp256k1_musig_session_init(
const secp256k1_xonly_pubkey *combined_pk,
const secp256k1_musig_pre_session *pre_session,
size_t n_signers,
size_t my_index,
const unsigned char *seckey
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4) SECP256K1_ARG_NONNULL(5) SECP256K1_ARG_NONNULL(7) SECP256K1_ARG_NONNULL(8) SECP256K1_ARG_NONNULL(11);