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Add GetSecret() and GetKeys() to CKeyStore
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // Copyright (c) 2011 The Bitcoin developers | ||
| // Distributed under the MIT/X11 software license, see the accompanying | ||
| // file license.txt or http://www.opensource.org/licenses/mit-license.php. | ||
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| #include <openssl/ec.h> | ||
| #include <openssl/ecdsa.h> | ||
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| // Generate a private key from just the secret parameter | ||
| int EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key) | ||
| { | ||
| int ok = 0; | ||
| BN_CTX *ctx = NULL; | ||
| EC_POINT *pub_key = NULL; | ||
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| if (!eckey) return 0; | ||
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| const EC_GROUP *group = EC_KEY_get0_group(eckey); | ||
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| if ((ctx = BN_CTX_new()) == NULL) | ||
| goto err; | ||
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| pub_key = EC_POINT_new(group); | ||
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| if (pub_key == NULL) | ||
| goto err; | ||
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| if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx)) | ||
| goto err; | ||
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| EC_KEY_set_private_key(eckey,priv_key); | ||
| EC_KEY_set_public_key(eckey,pub_key); | ||
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| ok = 1; | ||
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| err: | ||
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| if (pub_key) | ||
| EC_POINT_free(pub_key); | ||
| if (ctx != NULL) | ||
| BN_CTX_free(ctx); | ||
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| return(ok); | ||
| } | ||
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| // 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 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; | ||
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| int ret = 0; | ||
| BN_CTX *ctx = NULL; | ||
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| 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; | ||
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| 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; } | ||
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| ret = 1; | ||
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| 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; | ||
| } |
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