diff options
Diffstat (limited to 'src/key.h')
| -rw-r--r-- | src/key.h | 119 |
1 files changed, 2 insertions, 117 deletions
@@ -14,7 +14,6 @@ #include "serialize.h" #include "uint256.h" -#include "base58.h" // secp160k1 // const unsigned int PRIVATE_KEY_SIZE = 192; @@ -39,116 +38,8 @@ // see www.keylength.com // script supports up to 75 for single byte push -// Generate a private key from just the secret parameter -int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key) -{ - int ok = 0; - BN_CTX *ctx = NULL; - EC_POINT *pub_key = NULL; - - if (!eckey) return 0; - - const EC_GROUP *group = EC_KEY_get0_group(eckey); - - if ((ctx = BN_CTX_new()) == NULL) - goto err; - - pub_key = EC_POINT_new(group); - - if (pub_key == NULL) - goto err; - - if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx)) - goto err; - - EC_KEY_set_private_key(eckey,priv_key); - EC_KEY_set_public_key(eckey,pub_key); - - ok = 1; - -err: - - if (pub_key) - EC_POINT_free(pub_key); - if (ctx != NULL) - BN_CTX_free(ctx); - - return(ok); -} - -// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields -// recid selects which key is recovered -// if check is nonzero, additional checks are performed -int static inline ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check) -{ - if (!eckey) return 0; - - int ret = 0; - BN_CTX *ctx = NULL; - - BIGNUM *x = NULL; - BIGNUM *e = NULL; - BIGNUM *order = NULL; - BIGNUM *sor = NULL; - BIGNUM *eor = NULL; - BIGNUM *field = NULL; - EC_POINT *R = NULL; - EC_POINT *O = NULL; - EC_POINT *Q = NULL; - BIGNUM *rr = NULL; - BIGNUM *zero = NULL; - int n = 0; - int i = recid / 2; - - const EC_GROUP *group = EC_KEY_get0_group(eckey); - if ((ctx = BN_CTX_new()) == NULL) { ret = -1; goto err; } - BN_CTX_start(ctx); - order = BN_CTX_get(ctx); - if (!EC_GROUP_get_order(group, order, ctx)) { ret = -2; goto err; } - x = BN_CTX_get(ctx); - if (!BN_copy(x, order)) { ret=-1; goto err; } - if (!BN_mul_word(x, i)) { ret=-1; goto err; } - if (!BN_add(x, x, ecsig->r)) { ret=-1; goto err; } - field = BN_CTX_get(ctx); - if (!EC_GROUP_get_curve_GFp(group, field, NULL, NULL, ctx)) { ret=-2; goto err; } - if (BN_cmp(x, field) >= 0) { ret=0; goto err; } - if ((R = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } - if (!EC_POINT_set_compressed_coordinates_GFp(group, R, x, recid % 2, ctx)) { ret=0; goto err; } - if (check) - { - if ((O = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } - if (!EC_POINT_mul(group, O, NULL, R, order, ctx)) { ret=-2; goto err; } - if (!EC_POINT_is_at_infinity(group, O)) { ret = 0; goto err; } - } - if ((Q = EC_POINT_new(group)) == NULL) { ret = -2; goto err; } - n = EC_GROUP_get_degree(group); - e = BN_CTX_get(ctx); - if (!BN_bin2bn(msg, msglen, e)) { ret=-1; goto err; } - if (8*msglen > n) BN_rshift(e, e, 8-(n & 7)); - zero = BN_CTX_get(ctx); - if (!BN_zero(zero)) { ret=-1; goto err; } - if (!BN_mod_sub(e, zero, e, order, ctx)) { ret=-1; goto err; } - rr = BN_CTX_get(ctx); - if (!BN_mod_inverse(rr, ecsig->r, order, ctx)) { ret=-1; goto err; } - sor = BN_CTX_get(ctx); - if (!BN_mod_mul(sor, ecsig->s, rr, order, ctx)) { ret=-1; goto err; } - eor = BN_CTX_get(ctx); - if (!BN_mod_mul(eor, e, rr, order, ctx)) { ret=-1; goto err; } - if (!EC_POINT_mul(group, Q, eor, R, sor, ctx)) { ret=-2; goto err; } - if (!EC_KEY_set_public_key(eckey, Q)) { ret=-2; goto err; } - - ret = 1; - -err: - if (ctx) { - BN_CTX_end(ctx); - BN_CTX_free(ctx); - } - if (R != NULL) EC_POINT_free(R); - if (O != NULL) EC_POINT_free(O); - if (Q != NULL) EC_POINT_free(Q); - return ret; -} +int extern EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key); +int extern ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check); class key_error : public std::runtime_error { @@ -381,12 +272,6 @@ public: return false; return true; } - - // Get the address corresponding to this key - CBitcoinAddress GetAddress() const - { - return CBitcoinAddress(GetPubKey()); - } }; #endif |