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livesig.cpp
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livesig.cpp
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/*
* livesig.cpp
*
* Created by Arno Bakker
* Copyright 2013-2016 Vrije Universiteit Amsterdam. All rights reserved.
*/
#include "swift.h"
#include <event2/buffer.h>
#ifdef OPENSSL
#include <openssl/rsa.h>
#include <openssl/ecdsa.h>
#include <openssl/bn.h>
#include <openssl/pem.h> // for file I/O
// To prevent runtime error OPENSSL_Uplink(10111000,08): no OPENSSL_Applink
#ifdef _WIN32
#include <openssl/applink.c>
#endif
#endif
using namespace swift;
// From lib/dns/include/dns/keyvalues.h
#define DNS_SIG_ECDSA256SIZE 64
#define DNS_SIG_ECDSA384SIZE 96
#define DNS_KEY_ECDSA256SIZE 64
#define DNS_KEY_ECDSA384SIZE 96
// See http://stackoverflow.com/questions/17269238/ecdsa-signature-length
#define ECDSA_SIG_DER_ENCODED_PREFIX_LEN 8
/*
* Global class variables
*/
const Signature Signature::NOSIG = Signature();
const SwarmPubKey SwarmPubKey::NOSPUBKEY = SwarmPubKey();
/*
* Local functions (simple implementations when compiled without OpenSSL)
*/
static int fake_openssl_write_private_key(std::string keypairfilename, EVP_PKEY *pkey);
static EVP_PKEY *fake_openssl_read_private_key(std::string keypairfilename, popt_live_sig_alg_t *algptr);
// RSA
static EVP_MD_CTX *opensslrsa_createctx();
static void opensslrsa_destroyctx(EVP_MD_CTX *evp_md_ctx);
static int opensslrsa_adddata(EVP_MD_CTX *evp_md_ctx, unsigned char *data, unsigned int datalength);
static int opensslrsa_sign(EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, struct evbuffer *evb);
static int opensslrsa_verify2(EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, int maxbits, unsigned char *sigdata, unsigned int siglen);
static EVP_PKEY *opensslrsa_generate(uint16_t keysize, int exp, simple_openssl_callback_t callback);
static int opensslrsa_todns(struct evbuffer *evb,EVP_PKEY *pkey);
static EVP_PKEY *opensslrsa_fromdns(struct evbuffer *evb);
//ECDSA
static EVP_MD_CTX *opensslecdsa_createctx(popt_live_sig_alg_t alg);
static void opensslecdsa_destroyctx(EVP_MD_CTX *evp_md_ctx);
static int opensslecdsa_adddata(EVP_MD_CTX *evp_md_ctx, unsigned char *data, unsigned int datalength);
#ifdef OPENSSL
static int BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size);
#endif
static int opensslecdsa_sign(popt_live_sig_alg_t alg,EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, struct evbuffer *evb);
static int opensslecdsa_verify(popt_live_sig_alg_t alg,EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, unsigned char *sigdata, unsigned int gotsiglen);
static EVP_PKEY *opensslecdsa_generate(popt_live_sig_alg_t alg,simple_openssl_callback_t callback);
static int opensslecdsa_todns(struct evbuffer *evb,EVP_PKEY *pkey);
static EVP_PKEY *opensslecdsa_fromdns(popt_live_sig_alg_t alg,struct evbuffer *evb);
/*
* Signature
*/
Signature::Signature(uint8_t *sb, uint16_t len) : sigbits_(NULL), siglen_(0)
{
if (len == 0)
return;
siglen_ = len;
sigbits_ = new uint8_t[siglen_];
memcpy(sigbits_,sb,siglen_);
}
Signature::Signature(const Signature ©) : sigbits_(NULL), siglen_(0)
{
if (copy.siglen_ == 0)
return;
siglen_ = copy.siglen_;
sigbits_ = new uint8_t[siglen_];
memcpy(sigbits_,copy.sigbits_,siglen_);
}
Signature::Signature(bool hex, const uint8_t *sb, uint16_t len)
{
if (len == 0)
return;
if (hex)
{
siglen_ = len/2;
sigbits_ = new uint8_t[siglen_];
int val;
for(int i=0; i<siglen_; i++)
{
if (sscanf((const char *)(sb+i*2), "%2x", &val)!=1)
{
memset(sigbits_,0,siglen_);
return;
}
sigbits_[i] = val;
}
assert(this->hex()==std::string((const char *)sb));
}
else
{
siglen_ = len;
sigbits_ = new uint8_t[siglen_];
memcpy(sigbits_,sb,siglen_);
}
}
Signature::~Signature()
{
if (sigbits_ != NULL)
delete sigbits_;
sigbits_ = NULL;
}
Signature & Signature::operator= (const Signature & source)
{
if (this != &source)
{
if (source.siglen_ == 0)
{
siglen_ = 0;
if (sigbits_ != NULL)
delete sigbits_;
sigbits_ = NULL;
}
else
{
siglen_ = source.siglen_;
sigbits_ = new uint8_t[source.siglen_];
memcpy(sigbits_,source.sigbits_,source.siglen_);
}
}
return *this;
}
std::string Signature::hex() const {
char *hex = new char[siglen_*2+1];
for(int i=0; i<siglen_; i++)
sprintf(hex+i*2, "%02x", (int)(unsigned char)sigbits_[i]);
std::string s(hex,siglen_*2);
delete hex;
return s;
}
/*
* KeyPair
*/
KeyPair *KeyPair::Generate( popt_live_sig_alg_t alg, uint16_t keysize, simple_openssl_callback_t callback)
{
EVP_PKEY *evp = NULL;
if (alg == POPT_LIVE_SIG_ALG_RSASHA1)
evp = opensslrsa_generate(keysize, 0, callback);
else
evp = opensslecdsa_generate(alg,callback);
if (evp == NULL)
return NULL;
KeyPair *kp = new KeyPair(alg,evp);
return kp;
}
SwarmPubKey *KeyPair::GetSwarmPubKey()
{
struct evbuffer *evb = evbuffer_new();
// Add AlgorithmID
evbuffer_add_8(evb,alg_);
if (alg_ == POPT_LIVE_SIG_ALG_RSASHA1)
{
opensslrsa_todns(evb,evp_);
}
else
{
opensslecdsa_todns(evb,evp_);
}
if (evbuffer_get_length(evb) == 1)
{
evbuffer_free(evb);
return NULL;
}
uint8_t *bindata = (uint8_t *)evbuffer_pullup(evb,evbuffer_get_length(evb));
if (bindata == NULL)
{
evbuffer_free(evb);
return NULL;
}
else
{
SwarmPubKey *spubkey = new SwarmPubKey(bindata,evbuffer_get_length(evb));
evbuffer_free(evb);
return spubkey;
}
}
Signature *KeyPair::Sign(uint8_t *data, uint16_t datalength)
{
if (alg_ == POPT_LIVE_SIG_ALG_RSASHA1)
{
EVP_MD_CTX *ctx = opensslrsa_createctx();
if (ctx == NULL)
return NULL;
int ret = opensslrsa_adddata(ctx,data,datalength);
if (ret == 0)
{
opensslrsa_destroyctx(ctx);
return NULL;
}
struct evbuffer *evb = evbuffer_new();
ret = opensslrsa_sign(evp_,ctx, evb);
if (ret == 0)
{
evbuffer_free(evb);
opensslrsa_destroyctx(ctx);
return NULL;
}
Signature *sig = NULL;
uint8_t *sigdata = (uint8_t *)evbuffer_pullup(evb,evbuffer_get_length(evb));
if (sigdata != NULL)
sig = new Signature(sigdata,evbuffer_get_length(evb));
evbuffer_free(evb);
opensslrsa_destroyctx(ctx);
return sig;
}
else
{
EVP_MD_CTX *ctx = opensslecdsa_createctx(alg_);
if (ctx == NULL)
return NULL;
int ret = opensslecdsa_adddata(ctx,data,datalength);
if (ret == 0)
{
opensslecdsa_destroyctx(ctx);
return NULL;
}
struct evbuffer *evb = evbuffer_new();
ret = opensslecdsa_sign(alg_,evp_,ctx, evb);
if (ret == 0)
{
evbuffer_free(evb);
opensslecdsa_destroyctx(ctx);
return NULL;
}
Signature *sig = NULL;
uint8_t *sigdata = (uint8_t *)evbuffer_pullup(evb,evbuffer_get_length(evb));
if (sigdata != NULL)
sig = new Signature(sigdata,evbuffer_get_length(evb));
evbuffer_free(evb);
opensslecdsa_destroyctx(ctx);
return sig;
}
}
bool KeyPair::Verify(uint8_t *data, uint16_t datalength,Signature &sig)
{
if (alg_ == POPT_LIVE_SIG_ALG_RSASHA1)
{
EVP_MD_CTX *ctx = opensslrsa_createctx();
if (ctx == NULL)
return false;
int ret = opensslrsa_adddata(ctx,data,datalength);
if (ret == 0)
{
opensslrsa_destroyctx(ctx);
return false;
}
ret = opensslrsa_verify2(evp_,ctx,0,sig.bits(),sig.length());
opensslrsa_destroyctx(ctx);
return (ret == 1);
}
else
{
EVP_MD_CTX *ctx = opensslecdsa_createctx(alg_);
if (ctx == NULL)
return false;
int ret = opensslecdsa_adddata(ctx,data,datalength);
if (ret == 0)
{
opensslecdsa_destroyctx(ctx);
return false;
}
ret = opensslecdsa_verify(alg_,evp_,ctx,sig.bits(),sig.length());
opensslrsa_destroyctx(ctx);
return (ret == 1);
}
}
uint16_t KeyPair::GetSigSizeInBytes()
{
int siglen = EVP_PKEY_size(evp_);
if (alg_ == POPT_LIVE_SIG_ALG_RSASHA1)
return siglen;
else
return siglen - ECDSA_SIG_DER_ENCODED_PREFIX_LEN;
}
KeyPair *KeyPair::ReadPrivateKey(std::string keypairfilename)
{
popt_live_sig_alg_t alg=POPT_LIVE_SIG_ALG_PRIVATEDNS;
EVP_PKEY *pkey = fake_openssl_read_private_key(keypairfilename,&alg);
if (pkey == NULL)
return NULL;
else
return new KeyPair(alg,pkey);
}
int KeyPair::WritePrivateKey(std::string keypairfilename)
{
return fake_openssl_write_private_key(keypairfilename,evp_);
}
/*
* SwarmPubKey
*/
SwarmPubKey::SwarmPubKey(uint8_t *bits, uint16_t len)
{
if (len == 0)
return;
len_ = len;
bits_ = new uint8_t[len_];
memcpy(bits_,bits,len_);
}
SwarmPubKey::SwarmPubKey(const SwarmPubKey& copy) : bits_(NULL), len_(0)
{
if (copy.len_ == 0)
return;
len_ = copy.len_;
bits_ = new uint8_t[len_];
memcpy(bits_,copy.bits_,len_);
}
SwarmPubKey::SwarmPubKey(std::string hexstr)
{
int val;
uint16_t len = hexstr.length()/2;
char *hexcstr = new char[hexstr.length()+1];
strcpy(hexcstr,hexstr.c_str());
uint8_t *bits = new uint8_t[len];
int i=0;
for(i=0; i<len; i++)
{
if (sscanf(hexcstr+i*2, "%2x", &val)!=1)
break;
bits[i] = val;
}
if (i == len)
{
bits_ = bits;
len_ = len;
}
else
{
bits_ = NULL;
len_ = 0;
delete bits;
}
delete hexcstr;
}
SwarmPubKey::~SwarmPubKey()
{
if (bits_ != NULL)
delete bits_;
bits_ = NULL;
}
SwarmPubKey & SwarmPubKey::operator= (const SwarmPubKey & source)
{
if (this != &source)
{
if (source.len_ == 0)
{
len_ = 0;
if (bits_ != NULL)
delete bits_;
bits_ = NULL;
}
else
{
len_ = source.len_;
bits_ = new uint8_t[source.len_];
memcpy(bits_,source.bits_,source.len_);
}
}
return *this;
}
bool SwarmPubKey::operator == (const SwarmPubKey& b) const
{
if (len_ == 0 && b.len_ == 0)
return true;
else if (len_ != b.len_)
return false;
return 0==memcmp(bits_,b.bits_,len_);
}
std::string SwarmPubKey::hex() const
{
char *hex = new char[len_*2+1];
for(int i=0; i<len_; i++)
sprintf(hex+i*2, "%02x", (int)(unsigned char)bits_[i]);
std::string s(hex,len_*2);
delete hex;
return s;
}
KeyPair *SwarmPubKey::GetPublicKeyPair() const
{
if (len_ < 1)
return NULL;
popt_live_sig_alg_t alg = (popt_live_sig_alg_t)bits_[0];
struct evbuffer *evb = evbuffer_new();
evbuffer_add(evb,&bits_[1],len_-1);
EVP_PKEY *evp = NULL;
if (alg == POPT_LIVE_SIG_ALG_RSASHA1)
evp = opensslrsa_fromdns(evb);
else
evp = opensslecdsa_fromdns(alg,evb);
if (evp == NULL)
return NULL;
return new KeyPair(alg,evp);
}
/*
* Implementations of crypto
*/
#ifdef OPENSSL
static int fake_openssl_write_private_key(std::string keypairfilename, EVP_PKEY *pkey)
{
FILE *fp = fopen_utf8(keypairfilename.c_str(),"wb");
if (fp == NULL)
return -1;
int ret = PEM_write_PrivateKey(fp, pkey, NULL, NULL, 0, 0, NULL);
fclose(fp);
if (ret == 0)
return -1;
else
return 0;
}
static EVP_PKEY *fake_openssl_read_private_key(std::string keypairfilename, popt_live_sig_alg_t *algptr)
{
FILE *fp = fopen_utf8(keypairfilename.c_str(),"rb");
if (fp == NULL)
return NULL;
EVP_PKEY *pkey=NULL;
pkey = PEM_read_PrivateKey(fp, &pkey, NULL, NULL );
fclose(fp);
if (pkey == NULL)
return NULL;
int keytype = EVP_PKEY_type(pkey->type);
if (keytype == EVP_PKEY_RSA)
*algptr = POPT_LIVE_SIG_ALG_RSASHA1;
else if (keytype == EVP_PKEY_EC)
{
// returns length of DER-encoded max sig
int siglen = EVP_PKEY_size(pkey);
if (siglen == ECDSA_SIG_DER_ENCODED_PREFIX_LEN + DNS_SIG_ECDSA256SIZE)
*algptr = POPT_LIVE_SIG_ALG_ECDSAP256SHA256;
else if (siglen == ECDSA_SIG_DER_ENCODED_PREFIX_LEN + DNS_SIG_ECDSA384SIZE)
*algptr = POPT_LIVE_SIG_ALG_ECDSAP384SHA384;
else
fprintf(stderr,"fake_openssl_read_private_key: unknown siglen %d\n", siglen );
}
return pkey;
}
// Adapted from BIND9 opensslrsa_link.c
/*
* Copyright (C) 2004-2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#if defined(RSA_FLAG_NO_BLINDING)
#define SET_FLAGS(rsa) \
do { \
(rsa)->flags &= ~RSA_FLAG_BLINDING; \
(rsa)->flags |= RSA_FLAG_NO_BLINDING; \
} while (0)
#else
#define SET_FLAGS(rsa) \
do { \
(rsa)->flags &= ~RSA_FLAG_BLINDING; \
} while (0)
#endif
static EVP_MD_CTX *opensslrsa_createctx()
{
EVP_MD_CTX *evp_md_ctx=NULL;
const EVP_MD *type = EVP_sha1(); /* SHA1 + RSA */;
evp_md_ctx = EVP_MD_CTX_create();
if (evp_md_ctx == NULL)
return NULL;
if (!EVP_DigestInit_ex(evp_md_ctx, type, NULL)) {
EVP_MD_CTX_destroy(evp_md_ctx);
return NULL;
}
return evp_md_ctx;
}
static void opensslrsa_destroyctx(EVP_MD_CTX *evp_md_ctx)
{
if (evp_md_ctx != NULL) {
EVP_MD_CTX_destroy(evp_md_ctx);
}
}
static int opensslrsa_adddata(EVP_MD_CTX *evp_md_ctx, unsigned char *data, unsigned int datalength)
{
if (!EVP_DigestUpdate(evp_md_ctx, data, datalength)) {
return 0;
}
return 1;
}
static int opensslrsa_sign(EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, struct evbuffer *evb)
{
unsigned int siglen = 0;
unsigned char *sigdata = new unsigned char[EVP_PKEY_size(pkey)];
if (sigdata == NULL)
return 0;
if (!EVP_SignFinal(evp_md_ctx, sigdata, &siglen, pkey)) {
delete sigdata;
return 0;
}
evbuffer_add(evb,sigdata,siglen);
delete sigdata;
return 1;
}
static int opensslrsa_verify2(EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, int maxbits, unsigned char *sigdata, unsigned int siglen)
{
int status = 0;
RSA *rsa;
int bits;
rsa = EVP_PKEY_get1_RSA(pkey);
if (rsa == NULL)
return 0;
bits = BN_num_bits(rsa->e);
RSA_free(rsa);
if (bits > maxbits && maxbits != 0)
return 0;
return EVP_VerifyFinal(evp_md_ctx, sigdata, siglen, pkey);
}
static int generate_progress_cb(int p, int n, BN_GENCB *cb)
{
simple_openssl_callback_t func;
if (cb->arg != NULL)
{
func = (simple_openssl_callback_t)cb->arg;
func(p);
}
return 1;
}
static EVP_PKEY *opensslrsa_generate(uint16_t keysize, int exp, simple_openssl_callback_t callback)
{
BN_GENCB cb;
RSA *rsa = RSA_new();
BIGNUM *e = BN_new();
EVP_PKEY *pkey = EVP_PKEY_new();
if (rsa == NULL || e == NULL || pkey == NULL)
{
if (pkey != NULL)
EVP_PKEY_free(pkey);
if (e != NULL)
BN_free(e);
if (rsa != NULL)
RSA_free(rsa);
return NULL;
}
if (!EVP_PKEY_set1_RSA(pkey, rsa))
{
if (pkey != NULL)
EVP_PKEY_free(pkey);
if (e != NULL)
BN_free(e);
if (rsa != NULL)
RSA_free(rsa);
return NULL;
}
if (exp == 0) {
/* RSA_F4 0x10001 */
BN_set_bit(e, 0);
BN_set_bit(e, 16);
} else {
/* (phased-out) F5 0x100000001 */
BN_set_bit(e, 0);
BN_set_bit(e, 32);
}
BN_GENCB_set(&cb, &generate_progress_cb, (void *)callback);
if (RSA_generate_key_ex(rsa, keysize, e, &cb)) {
// Success
BN_free(e);
SET_FLAGS(rsa);
RSA_free(rsa);
return pkey;
}
else
return NULL;
}
static int opensslrsa_todns(struct evbuffer *evb,EVP_PKEY *pkey)
{
unsigned int e_bytes;
unsigned int mod_bytes;
RSA *rsa;
if (pkey == NULL)
return 0;
rsa = EVP_PKEY_get1_RSA(pkey);
if (rsa == NULL)
return 0;
e_bytes = BN_num_bytes(rsa->e);
mod_bytes = BN_num_bytes(rsa->n);
// RFC3110
if (e_bytes < 256) { /*%< key exponent is <= 2040 bits */
evbuffer_add_8(evb,(uint8_t) e_bytes);
} else {
evbuffer_add_8(evb,0);
evbuffer_add_16be(evb,(uint16_t) e_bytes);
}
unsigned char *space = new unsigned char[BN_num_bytes(rsa->e)];
BN_bn2bin(rsa->e, space);
evbuffer_add(evb,space,BN_num_bytes(rsa->e));
delete space;
space = new unsigned char[BN_num_bytes(rsa->n)];
BN_bn2bin(rsa->n, space);
evbuffer_add(evb,space,BN_num_bytes(rsa->n));
delete space;
if (rsa != NULL)
RSA_free(rsa);
return 1;
}
static EVP_PKEY *opensslrsa_fromdns(struct evbuffer *evb)
{
RSA *rsa;
unsigned int e_bytes;
EVP_PKEY *pkey;
rsa = RSA_new();
if (rsa == NULL)
return NULL;
SET_FLAGS(rsa);
if (evbuffer_get_length(evb) < 1) {
RSA_free(rsa);
return NULL;
}
e_bytes = evbuffer_remove_8(evb);
// RFC3110
if (e_bytes == 0) {
if (evbuffer_get_length(evb) < 2) {
RSA_free(rsa);
return NULL;
}
e_bytes = evbuffer_remove_16be(evb);
}
if (evbuffer_get_length(evb) < e_bytes) {
RSA_free(rsa);
return NULL;
}
uint8_t *bindata = new uint8_t[e_bytes];
evbuffer_remove(evb,bindata,e_bytes);
rsa->e = BN_bin2bn(bindata, e_bytes, NULL);
delete bindata;
unsigned int n_bytes = evbuffer_get_length(evb);
bindata = new uint8_t[n_bytes];
evbuffer_remove(evb,bindata,n_bytes);
rsa->n = BN_bin2bn(bindata, n_bytes, NULL);
delete bindata;
pkey = EVP_PKEY_new();
if (pkey == NULL) {
RSA_free(rsa);
return NULL;
}
if (!EVP_PKEY_set1_RSA(pkey, rsa)) {
EVP_PKEY_free(pkey);
RSA_free(rsa);
return NULL;
}
RSA_free(rsa);
return pkey;
}
/*
* ECDSA
*/
#ifndef NID_X9_62_prime256v1
#error "P-256 group is not known (NID_X9_62_prime256v1)"
#endif
#ifndef NID_secp384r1
#error "P-384 group is not known (NID_secp384r1)"
#endif
static EVP_MD_CTX *opensslecdsa_createctx(popt_live_sig_alg_t alg)
{
EVP_MD_CTX *evp_md_ctx;
const EVP_MD *type = NULL;
evp_md_ctx = EVP_MD_CTX_create();
if (evp_md_ctx == NULL)
return NULL;
if (alg == POPT_LIVE_SIG_ALG_ECDSAP256SHA256)
type = EVP_sha256();
else
type = EVP_sha384();
if (!EVP_DigestInit_ex(evp_md_ctx, type, NULL)) {
EVP_MD_CTX_destroy(evp_md_ctx);
return NULL;
}
return evp_md_ctx;
}
static void opensslecdsa_destroyctx(EVP_MD_CTX *evp_md_ctx)
{
if (evp_md_ctx != NULL) {
EVP_MD_CTX_destroy(evp_md_ctx);
}
}
static int opensslecdsa_adddata(EVP_MD_CTX *evp_md_ctx, unsigned char *data, unsigned int datalength)
{
if (!EVP_DigestUpdate(evp_md_ctx, data, datalength))
return 0;
return 1;
}
static int BN_bn2bin_fixed(BIGNUM *bn, unsigned char *buf, int size)
{
int bytes = size - BN_num_bytes(bn);
while (bytes-- > 0)
*buf++ = 0;
BN_bn2bin(bn, buf);
return (size);
}
static int opensslecdsa_sign(popt_live_sig_alg_t alg,EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, struct evbuffer *evb)
{
ECDSA_SIG *ecdsasig;
EC_KEY *eckey = EVP_PKEY_get1_EC_KEY(pkey);
unsigned int dgstlen, siglen;
unsigned char digest[EVP_MAX_MD_SIZE];
if (eckey == NULL)
return 0;
if (alg == POPT_LIVE_SIG_ALG_ECDSAP256SHA256)
siglen = DNS_SIG_ECDSA256SIZE;
else
siglen = DNS_SIG_ECDSA384SIZE;
unsigned char *sigdata = new unsigned char[siglen];
if (sigdata == NULL)
{
EC_KEY_free(eckey);
return 0;
}
if (!EVP_DigestFinal(evp_md_ctx, digest, &dgstlen))
{
EC_KEY_free(eckey);
return 0;
}
ecdsasig = ECDSA_do_sign(digest, dgstlen, eckey);
if (ecdsasig == NULL)
{
EC_KEY_free(eckey);
return 0;
}
BN_bn2bin_fixed(ecdsasig->r, sigdata, siglen / 2);
BN_bn2bin_fixed(ecdsasig->s, sigdata+siglen/2, siglen / 2);
ECDSA_SIG_free(ecdsasig);
evbuffer_add(evb,sigdata,siglen);
delete sigdata;
EC_KEY_free(eckey);
return 1;
}
static int opensslecdsa_verify(popt_live_sig_alg_t alg,EVP_PKEY *pkey, EVP_MD_CTX *evp_md_ctx, unsigned char *sigdata, unsigned int gotsiglen)
{
int status;
unsigned char *cp = sigdata;
ECDSA_SIG *ecdsasig = NULL;
EC_KEY *eckey = EVP_PKEY_get1_EC_KEY(pkey);
unsigned int dgstlen, siglen;
unsigned char digest[EVP_MAX_MD_SIZE];
if (eckey == NULL)
return 0;
if (alg == POPT_LIVE_SIG_ALG_ECDSAP256SHA256)
siglen = DNS_SIG_ECDSA256SIZE;
else
siglen = DNS_SIG_ECDSA384SIZE;
if (gotsiglen != siglen)
{
EC_KEY_free(eckey);
return 0;
}
if (!EVP_DigestFinal_ex(evp_md_ctx, digest, &dgstlen))
{
EC_KEY_free(eckey);
return 0;
}
ecdsasig = ECDSA_SIG_new();
if (ecdsasig == NULL)
{
EC_KEY_free(eckey);
return 0;
}
if (ecdsasig->r != NULL)
BN_free(ecdsasig->r);
ecdsasig->r = BN_bin2bn(cp, siglen / 2, NULL);
cp += siglen / 2;
if (ecdsasig->s != NULL)
BN_free(ecdsasig->s);
ecdsasig->s = BN_bin2bn(cp, siglen / 2, NULL);
/* cp += siglen / 2; */
status = ECDSA_do_verify(digest, dgstlen, ecdsasig, eckey);
if (ecdsasig != NULL)
ECDSA_SIG_free(ecdsasig);
if (eckey != NULL)
EC_KEY_free(eckey);
return status;
}
static EVP_PKEY *opensslecdsa_generate(popt_live_sig_alg_t alg,simple_openssl_callback_t callback)
{
EVP_PKEY *pkey;
EC_KEY *eckey = NULL;
int group_nid;
if (alg == POPT_LIVE_SIG_ALG_ECDSAP256SHA256)
group_nid = NID_X9_62_prime256v1;
else
group_nid = NID_secp384r1;
eckey = EC_KEY_new_by_curve_name(group_nid);
if (eckey == NULL)
return NULL;
if (EC_KEY_generate_key(eckey) != 1)
{
EC_KEY_free(eckey);
return NULL;
}
pkey = EVP_PKEY_new();
if (pkey == NULL)
{
EC_KEY_free(eckey);
return NULL;
}
if (!EVP_PKEY_set1_EC_KEY(pkey, eckey)) {
EVP_PKEY_free(pkey);
EC_KEY_free(eckey);
return NULL;
}
if (eckey != NULL)
EC_KEY_free(eckey);
return pkey;
}
static int opensslecdsa_todns(struct evbuffer *evb,EVP_PKEY *pkey)
{
EC_KEY *eckey = NULL;