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121 lines
5.3 KiB
121 lines
5.3 KiB
#ifndef _SECP256K1_
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#define _SECP256K1_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Initialize the library. This may take some time (10-100 ms).
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* You need to call this before calling any other function.
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* It cannot run in parallel with any other functions, but once
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* secp256k1_start() returns, all other functions are thread-safe.
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*/
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void secp256k1_start(void);
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/** Free all memory associated with this library. After this, no
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* functions can be called anymore, except secp256k1_start()
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*/
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void secp256k1_stop(void);
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/** Verify an ECDSA signature.
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* Returns: 1: correct signature
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* 0: incorrect signature
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* -1: invalid public key
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* -2: invalid signature
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*/
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int secp256k1_ecdsa_verify(const unsigned char *msg, int msglen,
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const unsigned char *sig, int siglen,
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const unsigned char *pubkey, int pubkeylen);
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/** Create an ECDSA signature.
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* Returns: 1: signature created
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* 0: nonce invalid, try another one
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* In: msg: the message being signed
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* msglen: the length of the message being signed
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* seckey: pointer to a 32-byte secret key (assumed to be valid)
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* nonce: pointer to a 32-byte nonce (generated with a cryptographic PRNG)
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* Out: sig: pointer to a 72-byte array where the signature will be placed.
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* siglen: pointer to an int, which will be updated to the signature length (<=72).
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*/
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int secp256k1_ecdsa_sign(const unsigned char *msg, int msglen,
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unsigned char *sig, int *siglen,
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const unsigned char *seckey,
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const unsigned char *nonce);
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/** Create a compact ECDSA signature (64 byte + recovery id).
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* Returns: 1: signature created
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* 0: nonce invalid, try another one
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* In: msg: the message being signed
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* msglen: the length of the message being signed
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* seckey: pointer to a 32-byte secret key (assumed to be valid)
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* nonce: pointer to a 32-byte nonce (generated with a cryptographic PRNG)
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* Out: sig: pointer to a 64-byte array where the signature will be placed.
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* recid: pointer to an int, which will be updated to contain the recovery id.
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*/
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int secp256k1_ecdsa_sign_compact(const unsigned char *msg, int msglen,
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unsigned char *sig64,
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const unsigned char *seckey,
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const unsigned char *nonce,
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int *recid);
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/** Recover an ECDSA public key from a compact signature.
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* Returns: 1: public key succesfully recovered (which guarantees a correct signature).
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* 0: otherwise.
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* In: msg: the message assumed to be signed
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* msglen: the length of the message
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* sig64: signature as 64 byte array
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* compressed: whether to recover a compressed or uncompressed pubkey
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* recid: the recovery id (as returned by ecdsa_sign_compact)
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* Out: pubkey: pointer to a 33 or 65 byte array to put the pubkey.
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* pubkeylen: pointer to an int that will contain the pubkey length.
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*/
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int secp256k1_ecdsa_recover_compact(const unsigned char *msg, int msglen,
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const unsigned char *sig64,
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unsigned char *pubkey, int *pubkeylen,
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int compressed, int recid);
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/** Verify an ECDSA secret key.
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* Returns: 1: secret key is valid
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* 0: secret key is invalid
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* In: seckey: pointer to a 32-byte secret key
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*/
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int secp256k1_ecdsa_seckey_verify(const unsigned char *seckey);
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/** Just validate a public key.
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* Returns: 1: valid public key
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* 0: invalid public key
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*/
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int secp256k1_ecdsa_pubkey_verify(const unsigned char *pubkey, int pubkeylen);
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/** Compute the public key for a secret key.
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* In: compressed: whether the computed public key should be compressed
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* seckey: pointer to a 32-byte private key.
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* Out: pubkey: pointer to a 33-byte (if compressed) or 65-byte (if uncompressed)
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* area to store the public key.
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* pubkeylen: pointer to int that will be updated to contains the pubkey's
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* length.
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* Returns: 1: secret was valid, public key stores
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* 0: secret was invalid, try again.
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*/
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int secp256k1_ecdsa_pubkey_create(unsigned char *pubkey, int *pubkeylen, const unsigned char *seckey, int compressed);
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int secp256k1_ecdsa_pubkey_decompress(unsigned char *pubkey, int *pubkeylen);
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int secp256k1_ecdsa_privkey_export(const unsigned char *seckey,
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unsigned char *privkey, int *privkeylen,
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int compressed);
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int secp256k1_ecdsa_privkey_import(unsigned char *seckey,
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const unsigned char *privkey, int privkeylen);
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int secp256k1_ecdsa_privkey_tweak_add(unsigned char *seckey, const unsigned char *tweak);
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int secp256k1_ecdsa_pubkey_tweak_add(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak);
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int secp256k1_ecdsa_privkey_tweak_mul(unsigned char *seckey, const unsigned char *tweak);
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int secp256k1_ecdsa_pubkey_tweak_mul(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak);
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#ifdef __cplusplus
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}
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#endif
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#endif
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