35 lines
1.2 KiB
C
Executable file
35 lines
1.2 KiB
C
Executable file
#include <Python.h>
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#include <secp256k1.h>
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static PyObject * priv2pub(PyObject *self, PyObject *args) {
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const unsigned char * privkey;
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const int klen;
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const int compressed;
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if (!PyArg_ParseTuple(args, "t#I", &privkey, &klen, &compressed))
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return NULL;
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if (klen != 32) return NULL;
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secp256k1_pubkey pubkey;
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size_t pubkeyclen = compressed == 1 ? 33: 65;
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unsigned char pubkeyc[pubkeyclen];
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static secp256k1_context *ctx = NULL;
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if (ctx == NULL) {
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/* puts ("Initializing context"); */
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ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
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}
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if (secp256k1_ec_pubkey_create(ctx, &pubkey, privkey) != 1) return NULL;
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if (secp256k1_ec_pubkey_serialize(ctx, pubkeyc, &pubkeyclen, &pubkey,
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compressed == 1 ? SECP256K1_EC_COMPRESSED: SECP256K1_EC_UNCOMPRESSED) != 1)
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return NULL;
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return Py_BuildValue("s#", pubkeyc,pubkeyclen);
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}
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static PyMethodDef secp256k1Methods[] = {
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{"priv2pub", priv2pub, METH_VARARGS, "Generate pubkey from privkey using libsecp256k1"},
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{NULL, NULL, 0, NULL} /* Sentinel */
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};
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PyMODINIT_FUNC initsecp256k1(void) {
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PyObject *m;
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m = Py_InitModule("secp256k1", secp256k1Methods);
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if (m == NULL) return;
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}
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