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40 lines
977 B
40 lines
977 B
5 years ago
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#include <bitcoin/privkey.h>
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#include <bitcoin/pubkey.h>
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#include <common/blinding.h>
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#include <common/utils.h>
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void blinding_hash_e_and_ss(const struct pubkey *e,
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const struct secret *ss,
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struct sha256 *sha)
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{
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u8 der[PUBKEY_CMPR_LEN];
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struct sha256_ctx shactx;
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pubkey_to_der(der, e);
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sha256_init(&shactx);
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sha256_update(&shactx, der, sizeof(der));
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sha256_update(&shactx, ss->data, sizeof(ss->data));
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sha256_done(&shactx, sha);
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}
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/* E(i+1) = H(E(i) || ss(i)) * E(i) */
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bool blinding_next_pubkey(const struct pubkey *pk,
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const struct sha256 *h,
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struct pubkey *next)
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{
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*next = *pk;
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return secp256k1_ec_pubkey_tweak_mul(secp256k1_ctx, &next->pubkey,
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h->u.u8) == 1;
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}
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/* e(i+1) = H(E(i) || ss(i)) * e(i) */
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bool blinding_next_privkey(const struct privkey *e,
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const struct sha256 *h,
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struct privkey *next)
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{
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*next = *e;
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return secp256k1_ec_privkey_tweak_mul(secp256k1_ctx, next->secret.data,
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h->u.u8) == 1;
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}
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