/* * Copyright (C) 2008-2013 Tobias Brunner * HSR Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #include #ifndef OPENSSL_NO_EC #include #include #include #include #include "openssl_ec_diffie_hellman.h" #include "openssl_util.h" #include typedef struct private_openssl_ec_diffie_hellman_t private_openssl_ec_diffie_hellman_t; /** * Private data of an openssl_ec_diffie_hellman_t object. */ struct private_openssl_ec_diffie_hellman_t { /** * Public openssl_ec_diffie_hellman_t interface. */ openssl_ec_diffie_hellman_t public; /** * Diffie Hellman group number. */ diffie_hellman_group_t group; /** * EC private (public) key */ EC_KEY *key; /** * EC group */ const EC_GROUP *ec_group; /** * Other public key */ EC_POINT *pub_key; /** * Shared secret */ chunk_t shared_secret; /** * True if shared secret is computed */ bool computed; }; /** * Convert a chunk to an EC_POINT (which must already exist). The x and y * coordinates of the point have to be concatenated in the chunk. */ static bool chunk2ecp(const EC_GROUP *group, chunk_t chunk, EC_POINT *point) { BN_CTX *ctx; BIGNUM *x, *y; bool ret = FALSE; ctx = BN_CTX_new(); if (!ctx) { return FALSE; } BN_CTX_start(ctx); x = BN_CTX_get(ctx); y = BN_CTX_get(ctx); if (!x || !y) { goto error; } if (!openssl_bn_split(chunk, x, y)) { goto error; } if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx)) { goto error; } if (!EC_POINT_is_on_curve(group, point, ctx)) { goto error; } ret = TRUE; error: BN_CTX_end(ctx); BN_CTX_free(ctx); return ret; } /** * Convert an EC_POINT to a chunk by concatenating the x and y coordinates of * the point. This function allocates memory for the chunk. */ static bool ecp2chunk(const EC_GROUP *group, const EC_POINT *point, chunk_t *chunk, bool x_coordinate_only) { BN_CTX *ctx; BIGNUM *x, *y; bool ret = FALSE; ctx = BN_CTX_new(); if (!ctx) { return FALSE; } BN_CTX_start(ctx); x = BN_CTX_get(ctx); y = BN_CTX_get(ctx); if (!x || !y) { goto error; } if (!EC_POINT_get_affine_coordinates_GFp(group, point, x, y, ctx)) { goto error; } if (x_coordinate_only) { y = NULL; } if (!openssl_bn_cat(EC_FIELD_ELEMENT_LEN(group), x, y, chunk)) { goto error; } ret = TRUE; error: BN_CTX_end(ctx); BN_CTX_free(ctx); return ret; } /** * Compute the shared secret. * * We cannot use the function ECDH_compute_key() because that returns only the * x coordinate of the shared secret point (which is defined, for instance, in * 'NIST SP 800-56A'). * However, we need both coordinates as RFC 4753 says: "The Diffie-Hellman * public value is obtained by concatenating the x and y values. The format * of the Diffie-Hellman shared secret value is the same as that of the * Diffie-Hellman public value." */ static bool compute_shared_key(private_openssl_ec_diffie_hellman_t *this, chunk_t *shared_secret) { const BIGNUM *priv_key; EC_POINT *secret = NULL; bool x_coordinate_only, ret = FALSE; priv_key = EC_KEY_get0_private_key(this->key); if (!priv_key) { goto error; } secret = EC_POINT_new(this->ec_group); if (!secret) { goto error; } if (!EC_POINT_mul(this->ec_group, secret, NULL, this->pub_key, priv_key, NULL)) { goto error; } /* * The default setting ecp_x_coordinate_only = TRUE * applies the following errata for RFC 4753: * http://www.rfc-editor.org/errata_search.php?eid=9 */ x_coordinate_only = lib->settings->get_bool(lib->settings, "%s.ecp_x_coordinate_only", TRUE, lib->ns); if (!ecp2chunk(this->ec_group, secret, shared_secret, x_coordinate_only)) { goto error; } ret = TRUE; error: if (secret) { EC_POINT_clear_free(secret); } return ret; } METHOD(diffie_hellman_t, set_other_public_value, bool, private_openssl_ec_diffie_hellman_t *this, chunk_t value) { if (!diffie_hellman_verify_value(this->group, value)) { return FALSE; } if (!chunk2ecp(this->ec_group, value, this->pub_key)) { DBG1(DBG_LIB, "ECDH public value is malformed"); return FALSE; } chunk_clear(&this->shared_secret); if (!compute_shared_key(this, &this->shared_secret)) { DBG1(DBG_LIB, "ECDH shared secret computation failed"); return FALSE; } this->computed = TRUE; return TRUE; } METHOD(diffie_hellman_t, get_my_public_value, bool, private_openssl_ec_diffie_hellman_t *this,chunk_t *value) { ecp2chunk(this->ec_group, EC_KEY_get0_public_key(this->key), value, FALSE); return TRUE; } METHOD(diffie_hellman_t, set_private_value, bool, private_openssl_ec_diffie_hellman_t *this, chunk_t value) { EC_POINT *pub = NULL; BIGNUM *priv = NULL; bool ret = FALSE; priv = BN_bin2bn(value.ptr, value.len, NULL); if (!priv) { goto error; } pub = EC_POINT_new(EC_KEY_get0_group(this->key)); if (!pub) { goto error; } if (EC_POINT_mul(this->ec_group, pub, priv, NULL, NULL, NULL) != 1) { goto error; } if (EC_KEY_set_private_key(this->key, priv) != 1) { goto error; } if (EC_KEY_set_public_key(this->key, pub) != 1) { goto error; } ret = TRUE; error: if (pub) { EC_POINT_free(pub); } if (priv) { BN_free(priv); } return ret; } METHOD(diffie_hellman_t, get_shared_secret, bool, private_openssl_ec_diffie_hellman_t *this, chunk_t *secret) { if (!this->computed) { return FALSE; } *secret = chunk_clone(this->shared_secret); return TRUE; } METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t, private_openssl_ec_diffie_hellman_t *this) { return this->group; } METHOD(diffie_hellman_t, destroy, void, private_openssl_ec_diffie_hellman_t *this) { if (this->pub_key) { EC_POINT_clear_free(this->pub_key); } if (this->key) { EC_KEY_free(this->key); } chunk_clear(&this->shared_secret); free(this); } /** * ECC Brainpool curves are not available in OpenSSL releases < 1.0.2, but we * don't check the version in case somebody backported them. * * BoringSSL defines the constants but not the curves. */ #if (!defined(NID_brainpoolP224r1) || !defined(NID_brainpoolP256r1) || \ !defined(NID_brainpoolP384r1) || !defined(NID_brainpoolP512r1) || \ defined(OPENSSL_IS_BORINGSSL)) /** * Parameters for ECC Brainpool curves */ typedef struct { /** DH group */ diffie_hellman_group_t group; /** The prime p specifying the base field */ const chunk_t p; /** Coefficient a of the elliptic curve E: y^2 = x^3 + ax + b (mod p) */ const chunk_t a; /** Coefficient b */ const chunk_t b; /** x coordinate of base point G (a point in E of prime order) */ const chunk_t x; /** y coordinate of base point G */ const chunk_t y; /** Prime order q of the group generated by G */ const chunk_t q; } bp_curve; /** * List of ECC Brainpool curves */ static bp_curve bp_curves[] = { { /* ECC Brainpool 224-bit curve (RFC 5639), brainpoolP224r1 */ .group = ECP_224_BP, .p = chunk_from_chars( 0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD1,0xD7,0x87, 0xB0,0x9F,0x07,0x57,0x97,0xDA,0x89,0xF5,0x7E,0xC8,0xC0,0xFF), .a = chunk_from_chars( 0x68,0xA5,0xE6,0x2C,0xA9,0xCE,0x6C,0x1C,0x29,0x98,0x03,0xA6,0xC1,0x53,0x0B,0x51, 0x4E,0x18,0x2A,0xD8,0xB0,0x04,0x2A,0x59,0xCA,0xD2,0x9F,0x43), .b = chunk_from_chars( 0x25,0x80,0xF6,0x3C,0xCF,0xE4,0x41,0x38,0x87,0x07,0x13,0xB1,0xA9,0x23,0x69,0xE3, 0x3E,0x21,0x35,0xD2,0x66,0xDB,0xB3,0x72,0x38,0x6C,0x40,0x0B), .x = chunk_from_chars( 0x0D,0x90,0x29,0xAD,0x2C,0x7E,0x5C,0xF4,0x34,0x08,0x23,0xB2,0xA8,0x7D,0xC6,0x8C, 0x9E,0x4C,0xE3,0x17,0x4C,0x1E,0x6E,0xFD,0xEE,0x12,0xC0,0x7D), .y = chunk_from_chars( 0x58,0xAA,0x56,0xF7,0x72,0xC0,0x72,0x6F,0x24,0xC6,0xB8,0x9E,0x4E,0xCD,0xAC,0x24, 0x35,0x4B,0x9E,0x99,0xCA,0xA3,0xF6,0xD3,0x76,0x14,0x02,0xCD), .q = chunk_from_chars( 0xD7,0xC1,0x34,0xAA,0x26,0x43,0x66,0x86,0x2A,0x18,0x30,0x25,0x75,0xD0,0xFB,0x98, 0xD1,0x16,0xBC,0x4B,0x6D,0xDE,0xBC,0xA3,0xA5,0xA7,0x93,0x9F), }, { /* ECC Brainpool 256-bit curve (RFC 5639), brainpoolP256r1 */ .group = ECP_256_BP, .p = chunk_from_chars( 0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x72, 0x6E,0x3B,0xF6,0x23,0xD5,0x26,0x20,0x28,0x20,0x13,0x48,0x1D,0x1F,0x6E,0x53,0x77), .a = chunk_from_chars( 0x7D,0x5A,0x09,0x75,0xFC,0x2C,0x30,0x57,0xEE,0xF6,0x75,0x30,0x41,0x7A,0xFF,0xE7, 0xFB,0x80,0x55,0xC1,0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9), .b = chunk_from_chars( 0x26,0xDC,0x5C,0x6C,0xE9,0x4A,0x4B,0x44,0xF3,0x30,0xB5,0xD9,0xBB,0xD7,0x7C,0xBF, 0x95,0x84,0x16,0x29,0x5C,0xF7,0xE1,0xCE,0x6B,0xCC,0xDC,0x18,0xFF,0x8C,0x07,0xB6), .x = chunk_from_chars( 0x8B,0xD2,0xAE,0xB9,0xCB,0x7E,0x57,0xCB,0x2C,0x4B,0x48,0x2F,0xFC,0x81,0xB7,0xAF, 0xB9,0xDE,0x27,0xE1,0xE3,0xBD,0x23,0xC2,0x3A,0x44,0x53,0xBD,0x9A,0xCE,0x32,0x62), .y = chunk_from_chars( 0x54,0x7E,0xF8,0x35,0xC3,0xDA,0xC4,0xFD,0x97,0xF8,0x46,0x1A,0x14,0x61,0x1D,0xC9, 0xC2,0x77,0x45,0x13,0x2D,0xED,0x8E,0x54,0x5C,0x1D,0x54,0xC7,0x2F,0x04,0x69,0x97), .q = chunk_from_chars( 0xA9,0xFB,0x57,0xDB,0xA1,0xEE,0xA9,0xBC,0x3E,0x66,0x0A,0x90,0x9D,0x83,0x8D,0x71, 0x8C,0x39,0x7A,0xA3,0xB5,0x61,0xA6,0xF7,0x90,0x1E,0x0E,0x82,0x97,0x48,0x56,0xA7), }, { /* ECC Brainpool 384-bit curve (RFC 5639), brainpoolP384r1 */ .group = ECP_384_BP, .p = chunk_from_chars( 0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF, 0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB4,0x12,0xB1,0xDA,0x19,0x7F,0xB7,0x11,0x23, 0xAC,0xD3,0xA7,0x29,0x90,0x1D,0x1A,0x71,0x87,0x47,0x00,0x13,0x31,0x07,0xEC,0x53), .a = chunk_from_chars( 0x7B,0xC3,0x82,0xC6,0x3D,0x8C,0x15,0x0C,0x3C,0x72,0x08,0x0A,0xCE,0x05,0xAF,0xA0, 0xC2,0xBE,0xA2,0x8E,0x4F,0xB2,0x27,0x87,0x13,0x91,0x65,0xEF,0xBA,0x91,0xF9,0x0F, 0x8A,0xA5,0x81,0x4A,0x50,0x3A,0xD4,0xEB,0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26), .b = chunk_from_chars( 0x04,0xA8,0xC7,0xDD,0x22,0xCE,0x28,0x26,0x8B,0x39,0xB5,0x54,0x16,0xF0,0x44,0x7C, 0x2F,0xB7,0x7D,0xE1,0x07,0xDC,0xD2,0xA6,0x2E,0x88,0x0E,0xA5,0x3E,0xEB,0x62,0xD5, 0x7C,0xB4,0x39,0x02,0x95,0xDB,0xC9,0x94,0x3A,0xB7,0x86,0x96,0xFA,0x50,0x4C,0x11), .x = chunk_from_chars( 0x1D,0x1C,0x64,0xF0,0x68,0xCF,0x45,0xFF,0xA2,0xA6,0x3A,0x81,0xB7,0xC1,0x3F,0x6B, 0x88,0x47,0xA3,0xE7,0x7E,0xF1,0x4F,0xE3,0xDB,0x7F,0xCA,0xFE,0x0C,0xBD,0x10,0xE8, 0xE8,0x26,0xE0,0x34,0x36,0xD6,0x46,0xAA,0xEF,0x87,0xB2,0xE2,0x47,0xD4,0xAF,0x1E), .y = chunk_from_chars( 0x8A,0xBE,0x1D,0x75,0x20,0xF9,0xC2,0xA4,0x5C,0xB1,0xEB,0x8E,0x95,0xCF,0xD5,0x52, 0x62,0xB7,0x0B,0x29,0xFE,0xEC,0x58,0x64,0xE1,0x9C,0x05,0x4F,0xF9,0x91,0x29,0x28, 0x0E,0x46,0x46,0x21,0x77,0x91,0x81,0x11,0x42,0x82,0x03,0x41,0x26,0x3C,0x53,0x15), .q = chunk_from_chars( 0x8C,0xB9,0x1E,0x82,0xA3,0x38,0x6D,0x28,0x0F,0x5D,0x6F,0x7E,0x50,0xE6,0x41,0xDF, 0x15,0x2F,0x71,0x09,0xED,0x54,0x56,0xB3,0x1F,0x16,0x6E,0x6C,0xAC,0x04,0x25,0xA7, 0xCF,0x3A,0xB6,0xAF,0x6B,0x7F,0xC3,0x10,0x3B,0x88,0x32,0x02,0xE9,0x04,0x65,0x65), }, { /* ECC Brainpool 512-bit curve (RFC 5639), brainpoolP512r1 */ .group = ECP_512_BP, .p = chunk_from_chars( 0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07, 0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x71, 0x7D,0x4D,0x9B,0x00,0x9B,0xC6,0x68,0x42,0xAE,0xCD,0xA1,0x2A,0xE6,0xA3,0x80,0xE6, 0x28,0x81,0xFF,0x2F,0x2D,0x82,0xC6,0x85,0x28,0xAA,0x60,0x56,0x58,0x3A,0x48,0xF3), .a = chunk_from_chars( 0x78,0x30,0xA3,0x31,0x8B,0x60,0x3B,0x89,0xE2,0x32,0x71,0x45,0xAC,0x23,0x4C,0xC5, 0x94,0xCB,0xDD,0x8D,0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC, 0x2D,0xED,0x5D,0x5A,0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5, 0x7F,0x11,0x17,0xA7,0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA), .b = chunk_from_chars( 0x3D,0xF9,0x16,0x10,0xA8,0x34,0x41,0xCA,0xEA,0x98,0x63,0xBC,0x2D,0xED,0x5D,0x5A, 0xA8,0x25,0x3A,0xA1,0x0A,0x2E,0xF1,0xC9,0x8B,0x9A,0xC8,0xB5,0x7F,0x11,0x17,0xA7, 0x2B,0xF2,0xC7,0xB9,0xE7,0xC1,0xAC,0x4D,0x77,0xFC,0x94,0xCA,0xDC,0x08,0x3E,0x67, 0x98,0x40,0x50,0xB7,0x5E,0xBA,0xE5,0xDD,0x28,0x09,0xBD,0x63,0x80,0x16,0xF7,0x23), .x = chunk_from_chars( 0x81,0xAE,0xE4,0xBD,0xD8,0x2E,0xD9,0x64,0x5A,0x21,0x32,0x2E,0x9C,0x4C,0x6A,0x93, 0x85,0xED,0x9F,0x70,0xB5,0xD9,0x16,0xC1,0xB4,0x3B,0x62,0xEE,0xF4,0xD0,0x09,0x8E, 0xFF,0x3B,0x1F,0x78,0xE2,0xD0,0xD4,0x8D,0x50,0xD1,0x68,0x7B,0x93,0xB9,0x7D,0x5F, 0x7C,0x6D,0x50,0x47,0x40,0x6A,0x5E,0x68,0x8B,0x35,0x22,0x09,0xBC,0xB9,0xF8,0x22), .y = chunk_from_chars( 0x7D,0xDE,0x38,0x5D,0x56,0x63,0x32,0xEC,0xC0,0xEA,0xBF,0xA9,0xCF,0x78,0x22,0xFD, 0xF2,0x09,0xF7,0x00,0x24,0xA5,0x7B,0x1A,0xA0,0x00,0xC5,0x5B,0x88,0x1F,0x81,0x11, 0xB2,0xDC,0xDE,0x49,0x4A,0x5F,0x48,0x5E,0x5B,0xCA,0x4B,0xD8,0x8A,0x27,0x63,0xAE, 0xD1,0xCA,0x2B,0x2F,0xA8,0xF0,0x54,0x06,0x78,0xCD,0x1E,0x0F,0x3A,0xD8,0x08,0x92), .q = chunk_from_chars( 0xAA,0xDD,0x9D,0xB8,0xDB,0xE9,0xC4,0x8B,0x3F,0xD4,0xE6,0xAE,0x33,0xC9,0xFC,0x07, 0xCB,0x30,0x8D,0xB3,0xB3,0xC9,0xD2,0x0E,0xD6,0x63,0x9C,0xCA,0x70,0x33,0x08,0x70, 0x55,0x3E,0x5C,0x41,0x4C,0xA9,0x26,0x19,0x41,0x86,0x61,0x19,0x7F,0xAC,0x10,0x47, 0x1D,0xB1,0xD3,0x81,0x08,0x5D,0xDA,0xDD,0xB5,0x87,0x96,0x82,0x9C,0xA9,0x00,0x69), }, }; /** * Create an EC_GROUP object for an ECC Brainpool curve */ EC_GROUP *ec_group_new_brainpool(bp_curve *curve) { BIGNUM *p, *a, *b, *x, *y, *q; const BIGNUM *h; EC_POINT *G = NULL; EC_GROUP *group = NULL, *result = NULL; BN_CTX *ctx = NULL; ctx = BN_CTX_new(); p = BN_bin2bn(curve->p.ptr, curve->p.len, NULL); a = BN_bin2bn(curve->a.ptr, curve->a.len, NULL); b = BN_bin2bn(curve->b.ptr, curve->b.len, NULL); x = BN_bin2bn(curve->x.ptr, curve->x.len, NULL); y = BN_bin2bn(curve->y.ptr, curve->y.len, NULL); q = BN_bin2bn(curve->q.ptr, curve->q.len, NULL); /* all supported groups have a cofactor of 1 */ h = BN_value_one(); if (!ctx || !p || !a || !b || !x || !y || !q) { goto failed; } group = EC_GROUP_new_curve_GFp(p, a, b, ctx); if (!group) { goto failed; } G = EC_POINT_new(group); if (!G || !EC_POINT_set_affine_coordinates_GFp(group, G, x, y, ctx)) { goto failed; } if (!EC_GROUP_set_generator(group, G, q, h)) { goto failed; } result = group; failed: if (!result && group) { EC_GROUP_free(group); } if (G) { EC_POINT_free(G); } BN_CTX_free(ctx); BN_free(p); BN_free(a); BN_free(b); BN_free(x); BN_free(y); BN_free(q); return result; } /** * Create an EC_KEY for ECC Brainpool curves as defined above */ static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group) { bp_curve *curve = NULL; EC_GROUP *ec_group; EC_KEY *key = NULL; int i; for (i = 0; i < countof(bp_curves); i++) { if (bp_curves[i].group == group) { curve = &bp_curves[i]; } } if (!curve) { return NULL; } ec_group = ec_group_new_brainpool(curve); if (!ec_group) { return NULL; } key = EC_KEY_new(); if (!key || !EC_KEY_set_group(key, ec_group)) { EC_KEY_free(key); key = NULL; } EC_GROUP_free(ec_group); return key; } #else /* !NID_brainpoolP224r1 || ... */ /** * Create an EC_KEY for ECC Brainpool curves as defined by OpenSSL */ static EC_KEY *ec_key_new_brainpool(diffie_hellman_group_t group) { switch (group) { case ECP_224_BP: return EC_KEY_new_by_curve_name(NID_brainpoolP224r1); case ECP_256_BP: return EC_KEY_new_by_curve_name(NID_brainpoolP256r1); case ECP_384_BP: return EC_KEY_new_by_curve_name(NID_brainpoolP384r1); case ECP_512_BP: return EC_KEY_new_by_curve_name(NID_brainpoolP512r1); default: return NULL; } } #endif /* !NID_brainpoolP224r1 || ... */ /* * Described in header. */ openssl_ec_diffie_hellman_t *openssl_ec_diffie_hellman_create(diffie_hellman_group_t group) { private_openssl_ec_diffie_hellman_t *this; INIT(this, .public = { .dh = { .get_shared_secret = _get_shared_secret, .set_other_public_value = _set_other_public_value, .get_my_public_value = _get_my_public_value, .set_private_value = _set_private_value, .get_dh_group = _get_dh_group, .destroy = _destroy, }, }, .group = group, ); switch (group) { case ECP_192_BIT: this->key = EC_KEY_new_by_curve_name(NID_X9_62_prime192v1); break; case ECP_224_BIT: this->key = EC_KEY_new_by_curve_name(NID_secp224r1); break; case ECP_256_BIT: this->key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); break; case ECP_384_BIT: this->key = EC_KEY_new_by_curve_name(NID_secp384r1); break; case ECP_521_BIT: this->key = EC_KEY_new_by_curve_name(NID_secp521r1); break; case ECP_224_BP: case ECP_256_BP: case ECP_384_BP: case ECP_512_BP: this->key = ec_key_new_brainpool(group); break; default: this->key = NULL; break; } if (!this->key) { free(this); return NULL; } /* caching the EC group */ this->ec_group = EC_KEY_get0_group(this->key); this->pub_key = EC_POINT_new(this->ec_group); if (!this->pub_key) { destroy(this); return NULL; } /* generate an EC private (public) key */ if (!EC_KEY_generate_key(this->key)) { destroy(this); return NULL; } return &this->public; } #endif /* OPENSSL_NO_EC */