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74 lines
2 KiB
C
74 lines
2 KiB
C
/*
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* Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include "dh_locl.h"
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#include <openssl/bn.h>
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#include <openssl/objects.h>
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#include "internal/bn_dh.h"
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static DH *dh_param_init(const BIGNUM *p, int32_t nbits)
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{
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DH *dh = DH_new();
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if (dh == NULL)
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return NULL;
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dh->p = (BIGNUM *)p;
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dh->g = (BIGNUM *)&_bignum_const_2;
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dh->length = nbits;
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return dh;
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}
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DH *DH_new_by_nid(int nid)
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{
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switch (nid) {
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case NID_ffdhe2048:
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return dh_param_init(&_bignum_ffdhe2048_p, 225);
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case NID_ffdhe3072:
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return dh_param_init(&_bignum_ffdhe3072_p, 275);
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case NID_ffdhe4096:
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return dh_param_init(&_bignum_ffdhe4096_p, 325);
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case NID_ffdhe6144:
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return dh_param_init(&_bignum_ffdhe6144_p, 375);
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case NID_ffdhe8192:
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return dh_param_init(&_bignum_ffdhe8192_p, 400);
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default:
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DHerr(DH_F_DH_NEW_BY_NID, DH_R_INVALID_PARAMETER_NID);
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return NULL;
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}
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}
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int DH_get_nid(const DH *dh)
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{
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int nid;
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if (BN_get_word(dh->g) != 2)
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return NID_undef;
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if (!BN_cmp(dh->p, &_bignum_ffdhe2048_p))
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nid = NID_ffdhe2048;
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else if (!BN_cmp(dh->p, &_bignum_ffdhe3072_p))
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nid = NID_ffdhe3072;
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else if (!BN_cmp(dh->p, &_bignum_ffdhe4096_p))
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nid = NID_ffdhe4096;
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else if (!BN_cmp(dh->p, &_bignum_ffdhe6144_p))
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nid = NID_ffdhe6144;
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else if (!BN_cmp(dh->p, &_bignum_ffdhe8192_p))
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nid = NID_ffdhe8192;
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else
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return NID_undef;
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if (dh->q != NULL) {
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BIGNUM *q = BN_dup(dh->p);
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/* Check q = p * 2 + 1 we already know q is odd, so just shift right */
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if (q == NULL || !BN_rshift1(q, q) || !BN_cmp(dh->q, q))
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nid = NID_undef;
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BN_free(q);
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}
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return nid;
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}
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