frost/secp256k1-zkp
3
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

surjectionproof: introduce SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS constant and set it to 16

Browse Source
This commit is contained in:
Andrew Poelstra
2019-04-30 23:04:08 +00:00
committed by Tim Ruffing
parent b8a3ff5f3b
commit 56f69d979f
4 changed files with 19 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/secp256k1_surjectionproof.h
View File

@@ -11,6 +11,9 @@ extern "C" {
/** Maximum number of inputs that may be given in a surjection proof */
#define SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS 256
/** Maximum number of inputs that may be used in a surjection proof */
#define SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS 16
/** Number of bytes a serialized surjection proof requires given the
* number of inputs and the number of used inputs.
*/
@@ -19,7 +22,7 @@ extern "C" {
/** Maximum number of bytes a serialized surjection proof requires. */
#define SECP256K1_SURJECTIONPROOF_SERIALIZATION_BYTES_MAX \
SECP256K1_SURJECTIONPROOF_SERIALIZATION_BYTES(SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS, SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS)
SECP256K1_SURJECTIONPROOF_SERIALIZATION_BYTES(SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS, SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS)
/** Opaque data structure that holds a parsed surjection proof
*
@@ -46,7 +49,7 @@ typedef struct {
/** Bitmap of which input tags are used in the surjection proof */
unsigned char used_inputs[SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS / 8];
/** Borromean signature: e0, scalars */
unsigned char data[32 * (1 + SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS)];
unsigned char data[32 * (1 + SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS)];
} secp256k1_surjectionproof;
/** Parse a surjection proof
@@ -143,7 +146,8 @@ SECP256K1_API size_t secp256k1_surjectionproof_serialized_size(
* e.g. in a coinjoin with others' inputs, an ephemeral tag can be given;
* this won't match the output tag but might be used in the anonymity set.)
* n_input_tags: the number of entries in the fixed_input_tags array
* n_input_tags_to_use: the number of inputs to select randomly to put in the anonymity set
* n_input_tags_to_use: the number of inputs to select randomly to put in the anonymity set
* Must be <= SECP256K1_SURJECTIONPROOF_MAX_USED_INPUTS
* fixed_output_tag: fixed output tag
* max_n_iterations: the maximum number of iterations to do before giving up. Because the
* maximum number of inputs (SECP256K1_SURJECTIONPROOF_MAX_N_INPUTS) is