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82 lines
2.0 KiB
82 lines
2.0 KiB
#include "privkey.h"
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#include "pubkey.h"
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#include <assert.h>
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#include <ccan/str/hex/hex.h>
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/* Must agree on key validity with bitcoin! Stolen from bitcoin/src/pubkey.h's
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* GetLen:
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* // Copyright (c) 2009-2010 Satoshi Nakamoto
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* // Copyright (c) 2009-2014 The Bitcoin Core developers
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* // Distributed under the MIT software license, see the accompanying
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* // file COPYING or http://www.opensource.org/licenses/mit-license.php.
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*/
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static unsigned int GetLen(unsigned char chHeader)
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{
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if (chHeader == 2 || chHeader == 3)
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return 33;
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if (chHeader == 4 || chHeader == 6 || chHeader == 7)
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return 65;
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return 0;
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}
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size_t pubkey_derlen(const struct pubkey *key)
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{
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size_t len = GetLen(key->der[0]);
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assert(len);
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return len;
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}
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bool pubkey_from_der(secp256k1_context *secpctx,
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const u8 *der, size_t len,
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struct pubkey *key)
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{
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if (len > sizeof(key->der))
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return false;
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memcpy(key->der, der, len);
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if (!secp256k1_ec_pubkey_parse(secpctx, &key->pubkey, key->der, len))
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return false;
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return true;
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}
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/* Pubkey from privkey */
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bool pubkey_from_privkey(secp256k1_context *secpctx,
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const struct privkey *privkey,
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struct pubkey *key,
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unsigned int compressed_flags)
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{
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size_t outlen;
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if (!secp256k1_ec_pubkey_create(secpctx, &key->pubkey, privkey->secret))
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return false;
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if (!secp256k1_ec_pubkey_serialize(secpctx, key->der, &outlen,
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&key->pubkey, compressed_flags))
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return false;
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assert(outlen == pubkey_derlen(key));
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return true;
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}
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bool pubkey_from_hexstr(secp256k1_context *secpctx,
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const char *derstr, size_t slen, struct pubkey *key)
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{
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size_t dlen;
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unsigned char der[65];
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dlen = hex_data_size(slen);
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if (dlen > sizeof(der))
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return false;
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if (!hex_decode(derstr, slen, der, dlen))
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return false;
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return pubkey_from_der(secpctx, der, dlen, key);
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}
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bool pubkey_eq(const struct pubkey *a, const struct pubkey *b)
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{
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return pubkey_derlen(a) == pubkey_derlen(b)
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&& memcmp(a->der, b->der, pubkey_derlen(a)) == 0;
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}
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