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bulletproofs: expose a macro returning proof-size #13

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bulletproofs: expose a macro returning proof-size #13

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8 changes: 7 additions & 1 deletion include/secp256k1_bulletproofs.h
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Expand Up @@ -10,11 +10,17 @@ extern "C" {

#include <stdint.h>

/** A function-like macro returning the size, in bytes, of an uncompressed
* Bulletproof proving that a value lies in the range [0, 2^(n_bits) - 1]
*/
#define SECP256K1_BULLETPROOFS_UNCOMPRESSED_SIZE(n_bits) (194UL + (n_bits) * 64)

/** Maximum size, in bytes, of an uncompressed rangeproof */
extern const size_t SECP256K1_BULLETPROOFS_RANGEPROOF_UNCOMPRESSED_MAX_LENGTH;

/** The same value, as a C macro so it can be used as C89 array size */
#define SECP256K1_BULLETPROOFS_RANGEPROOF_UNCOMPRESSED_MAX_LENGTH_ (194 + 4096)
#define SECP256K1_BULLETPROOFS_RANGEPROOF_UNCOMPRESSED_MAX_LENGTH_ \
SECP256K1_BULLETPROOFS_UNCOMPRESSED_SIZE(64)

/** Opaque data structure that holds the current state of an uncompressed
* Bulletproof proof generation. This data is not secret and does not need
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