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Diffstat (limited to 'crypto/secp256k1/secp256k1/include/secp256k1.h')
| -rw-r--r-- | crypto/secp256k1/secp256k1/include/secp256k1.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/crypto/secp256k1/secp256k1/include/secp256k1.h b/crypto/secp256k1/secp256k1/include/secp256k1.h new file mode 100644 index 000000000..fd6d6b1f4 --- /dev/null +++ b/crypto/secp256k1/secp256k1/include/secp256k1.h @@ -0,0 +1,121 @@ +#ifndef _SECP256K1_ +#define _SECP256K1_ + +#ifdef __cplusplus +extern "C" { +#endif + +/** Initialize the library. This may take some time (10-100 ms). + * You need to call this before calling any other function. + * It cannot run in parallel with any other functions, but once + * secp256k1_start() returns, all other functions are thread-safe. + */ +void secp256k1_start(void); + +/** Free all memory associated with this library. After this, no + * functions can be called anymore, except secp256k1_start() + */ +void secp256k1_stop(void); + +/** Verify an ECDSA signature. + * Returns: 1: correct signature + * 0: incorrect signature + * -1: invalid public key + * -2: invalid signature + */ +int secp256k1_ecdsa_verify(const unsigned char *msg, int msglen, + const unsigned char *sig, int siglen, + const unsigned char *pubkey, int pubkeylen); + +/** Create an ECDSA signature. + * Returns: 1: signature created + * 0: nonce invalid, try another one + * In: msg: the message being signed + * msglen: the length of the message being signed + * seckey: pointer to a 32-byte secret key (assumed to be valid) + * nonce: pointer to a 32-byte nonce (generated with a cryptographic PRNG) + * Out: sig: pointer to a 72-byte array where the signature will be placed. + * siglen: pointer to an int, which will be updated to the signature length (<=72). + */ +int secp256k1_ecdsa_sign(const unsigned char *msg, int msglen, + unsigned char *sig, int *siglen, + const unsigned char *seckey, + const unsigned char *nonce); + +/** Create a compact ECDSA signature (64 byte + recovery id). + * Returns: 1: signature created + * 0: nonce invalid, try another one + * In: msg: the message being signed + * msglen: the length of the message being signed + * seckey: pointer to a 32-byte secret key (assumed to be valid) + * nonce: pointer to a 32-byte nonce (generated with a cryptographic PRNG) + * Out: sig: pointer to a 64-byte array where the signature will be placed. + * recid: pointer to an int, which will be updated to contain the recovery id. + */ +int secp256k1_ecdsa_sign_compact(const unsigned char *msg, int msglen, + unsigned char *sig64, + const unsigned char *seckey, + const unsigned char *nonce, + int *recid); + +/** Recover an ECDSA public key from a compact signature. + * Returns: 1: public key succesfully recovered (which guarantees a correct signature). + * 0: otherwise. + * In: msg: the message assumed to be signed + * msglen: the length of the message + * sig64: signature as 64 byte array + * compressed: whether to recover a compressed or uncompressed pubkey + * recid: the recovery id (as returned by ecdsa_sign_compact) + * Out: pubkey: pointer to a 33 or 65 byte array to put the pubkey. + * pubkeylen: pointer to an int that will contain the pubkey length. + */ + +int secp256k1_ecdsa_recover_compact(const unsigned char *msg, int msglen, + const unsigned char *sig64, + unsigned char *pubkey, int *pubkeylen, + int compressed, int recid); + +/** Verify an ECDSA secret key. + * Returns: 1: secret key is valid + * 0: secret key is invalid + * In: seckey: pointer to a 32-byte secret key + */ +int secp256k1_ecdsa_seckey_verify(const unsigned char *seckey); + +/** Just validate a public key. + * Returns: 1: valid public key + * 0: invalid public key + */ +int secp256k1_ecdsa_pubkey_verify(const unsigned char *pubkey, int pubkeylen); + +/** Compute the public key for a secret key. + * In: compressed: whether the computed public key should be compressed + * seckey: pointer to a 32-byte private key. + * Out: pubkey: pointer to a 33-byte (if compressed) or 65-byte (if uncompressed) + * area to store the public key. + * pubkeylen: pointer to int that will be updated to contains the pubkey's + * length. + * Returns: 1: secret was valid, public key stores + * 0: secret was invalid, try again. + */ +int secp256k1_ecdsa_pubkey_create(unsigned char *pubkey, int *pubkeylen, const unsigned char *seckey, int compressed); + +int secp256k1_ecdsa_pubkey_decompress(unsigned char *pubkey, int *pubkeylen); + +int secp256k1_ecdsa_privkey_export(const unsigned char *seckey, + unsigned char *privkey, int *privkeylen, + int compressed); + +int secp256k1_ecdsa_privkey_import(unsigned char *seckey, + const unsigned char *privkey, int privkeylen); + +int secp256k1_ecdsa_privkey_tweak_add(unsigned char *seckey, const unsigned char *tweak); +int secp256k1_ecdsa_pubkey_tweak_add(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak); +int secp256k1_ecdsa_privkey_tweak_mul(unsigned char *seckey, const unsigned char *tweak); +int secp256k1_ecdsa_pubkey_tweak_mul(unsigned char *pubkey, int pubkeylen, const unsigned char *tweak); + +#ifdef __cplusplus +} +#endif + +#endif |