371 lines
7.8 KiB
C
371 lines
7.8 KiB
C
/*
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* keyraw.c - raw key operations and conversions
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*
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* (c) NLnet Labs, 2004-2008
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*
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* See the file LICENSE for the license
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*/
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/**
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* \file
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* Implementation of raw DNSKEY functions (work on wire rdata).
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*/
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#include "config.h"
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#include "ldns/keyraw.h"
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#include "ldns/rrdef.h"
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#ifdef HAVE_SSL
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#include <openssl/ssl.h>
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/md5.h>
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#ifdef HAVE_OPENSSL_ENGINE_H
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# include <openssl/engine.h>
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#endif
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#endif /* HAVE_SSL */
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size_t
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sldns_rr_dnskey_key_size_raw(const unsigned char* keydata,
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const size_t len, int alg)
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{
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/* for DSA keys */
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uint8_t t;
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/* for RSA keys */
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uint16_t exp;
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uint16_t int16;
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switch ((sldns_algorithm)alg) {
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case LDNS_DSA:
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case LDNS_DSA_NSEC3:
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if (len > 0) {
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t = keydata[0];
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return (64 + t*8)*8;
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} else {
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return 0;
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}
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break;
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case LDNS_RSAMD5:
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case LDNS_RSASHA1:
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case LDNS_RSASHA1_NSEC3:
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#ifdef USE_SHA2
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case LDNS_RSASHA256:
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case LDNS_RSASHA512:
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#endif
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if (len > 0) {
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if (keydata[0] == 0) {
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/* big exponent */
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if (len > 3) {
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memmove(&int16, keydata + 1, 2);
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exp = ntohs(int16);
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return (len - exp - 3)*8;
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} else {
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return 0;
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}
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} else {
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exp = keydata[0];
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return (len-exp-1)*8;
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}
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} else {
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return 0;
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}
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break;
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#ifdef USE_GOST
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case LDNS_ECC_GOST:
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return 512;
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#endif
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#ifdef USE_ECDSA
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case LDNS_ECDSAP256SHA256:
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return 256;
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case LDNS_ECDSAP384SHA384:
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return 384;
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#endif
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default:
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return 0;
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}
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}
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uint16_t sldns_calc_keytag_raw(uint8_t* key, size_t keysize)
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{
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if(keysize < 4) {
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return 0;
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}
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/* look at the algorithm field, copied from 2535bis */
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if (key[3] == LDNS_RSAMD5) {
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uint16_t ac16 = 0;
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if (keysize > 4) {
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memmove(&ac16, key + keysize - 3, 2);
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}
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ac16 = ntohs(ac16);
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return (uint16_t) ac16;
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} else {
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size_t i;
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uint32_t ac32 = 0;
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for (i = 0; i < keysize; ++i) {
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ac32 += (i & 1) ? key[i] : key[i] << 8;
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}
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ac32 += (ac32 >> 16) & 0xFFFF;
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return (uint16_t) (ac32 & 0xFFFF);
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}
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}
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#ifdef HAVE_SSL
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#ifdef USE_GOST
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/** store GOST engine reference loaded into OpenSSL library */
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ENGINE* sldns_gost_engine = NULL;
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int
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sldns_key_EVP_load_gost_id(void)
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{
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static int gost_id = 0;
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const EVP_PKEY_ASN1_METHOD* meth;
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ENGINE* e;
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if(gost_id) return gost_id;
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/* see if configuration loaded gost implementation from other engine*/
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meth = EVP_PKEY_asn1_find_str(NULL, "gost2001", -1);
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if(meth) {
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EVP_PKEY_asn1_get0_info(&gost_id, NULL, NULL, NULL, NULL, meth);
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return gost_id;
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}
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/* see if engine can be loaded already */
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e = ENGINE_by_id("gost");
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if(!e) {
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/* load it ourself, in case statically linked */
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ENGINE_load_builtin_engines();
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ENGINE_load_dynamic();
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e = ENGINE_by_id("gost");
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}
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if(!e) {
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/* no gost engine in openssl */
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return 0;
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}
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if(!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
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ENGINE_finish(e);
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ENGINE_free(e);
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return 0;
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}
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meth = EVP_PKEY_asn1_find_str(&e, "gost2001", -1);
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if(!meth) {
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/* algo not found */
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ENGINE_finish(e);
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ENGINE_free(e);
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return 0;
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}
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/* Note: do not ENGINE_finish and ENGINE_free the acquired engine
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* on some platforms this frees up the meth and unloads gost stuff */
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sldns_gost_engine = e;
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EVP_PKEY_asn1_get0_info(&gost_id, NULL, NULL, NULL, NULL, meth);
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return gost_id;
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}
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void sldns_key_EVP_unload_gost(void)
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{
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if(sldns_gost_engine) {
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ENGINE_finish(sldns_gost_engine);
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ENGINE_free(sldns_gost_engine);
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sldns_gost_engine = NULL;
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}
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}
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#endif /* USE_GOST */
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DSA *
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sldns_key_buf2dsa_raw(unsigned char* key, size_t len)
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{
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uint8_t T;
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uint16_t length;
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uint16_t offset;
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DSA *dsa;
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BIGNUM *Q; BIGNUM *P;
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BIGNUM *G; BIGNUM *Y;
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if(len == 0)
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return NULL;
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T = (uint8_t)key[0];
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length = (64 + T * 8);
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offset = 1;
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if (T > 8) {
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return NULL;
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}
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if(len < (size_t)1 + SHA_DIGEST_LENGTH + 3*length)
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return NULL;
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Q = BN_bin2bn(key+offset, SHA_DIGEST_LENGTH, NULL);
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offset += SHA_DIGEST_LENGTH;
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P = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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G = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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Y = BN_bin2bn(key+offset, (int)length, NULL);
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offset += length;
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/* create the key and set its properties */
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if(!Q || !P || !G || !Y || !(dsa = DSA_new())) {
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BN_free(Q);
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BN_free(P);
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BN_free(G);
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BN_free(Y);
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return NULL;
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}
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#ifndef S_SPLINT_S
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dsa->p = P;
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dsa->q = Q;
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dsa->g = G;
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dsa->pub_key = Y;
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#endif /* splint */
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return dsa;
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}
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RSA *
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sldns_key_buf2rsa_raw(unsigned char* key, size_t len)
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{
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uint16_t offset;
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uint16_t exp;
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uint16_t int16;
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RSA *rsa;
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BIGNUM *modulus;
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BIGNUM *exponent;
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if (len == 0)
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return NULL;
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if (key[0] == 0) {
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if(len < 3)
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return NULL;
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memmove(&int16, key+1, 2);
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exp = ntohs(int16);
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offset = 3;
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} else {
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exp = key[0];
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offset = 1;
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}
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/* key length at least one */
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if(len < (size_t)offset + exp + 1)
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return NULL;
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/* Exponent */
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exponent = BN_new();
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if(!exponent) return NULL;
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(void) BN_bin2bn(key+offset, (int)exp, exponent);
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offset += exp;
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/* Modulus */
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modulus = BN_new();
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if(!modulus) {
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BN_free(exponent);
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return NULL;
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}
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/* length of the buffer must match the key length! */
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(void) BN_bin2bn(key+offset, (int)(len - offset), modulus);
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rsa = RSA_new();
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if(!rsa) {
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BN_free(exponent);
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BN_free(modulus);
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return NULL;
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}
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#ifndef S_SPLINT_S
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rsa->n = modulus;
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rsa->e = exponent;
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#endif /* splint */
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return rsa;
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}
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#ifdef USE_GOST
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EVP_PKEY*
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sldns_gost2pkey_raw(unsigned char* key, size_t keylen)
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{
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/* prefix header for X509 encoding */
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uint8_t asn[37] = { 0x30, 0x63, 0x30, 0x1c, 0x06, 0x06, 0x2a, 0x85,
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0x03, 0x02, 0x02, 0x13, 0x30, 0x12, 0x06, 0x07, 0x2a, 0x85,
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0x03, 0x02, 0x02, 0x23, 0x01, 0x06, 0x07, 0x2a, 0x85, 0x03,
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0x02, 0x02, 0x1e, 0x01, 0x03, 0x43, 0x00, 0x04, 0x40};
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unsigned char encoded[37+64];
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const unsigned char* pp;
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if(keylen != 64) {
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/* key wrong size */
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return NULL;
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}
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/* create evp_key */
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memmove(encoded, asn, 37);
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memmove(encoded+37, key, 64);
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pp = (unsigned char*)&encoded[0];
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return d2i_PUBKEY(NULL, &pp, (int)sizeof(encoded));
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}
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#endif /* USE_GOST */
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#ifdef USE_ECDSA
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EVP_PKEY*
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sldns_ecdsa2pkey_raw(unsigned char* key, size_t keylen, uint8_t algo)
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{
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unsigned char buf[256+2]; /* sufficient for 2*384/8+1 */
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const unsigned char* pp = buf;
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EVP_PKEY *evp_key;
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EC_KEY *ec;
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/* check length, which uncompressed must be 2 bignums */
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if(algo == LDNS_ECDSAP256SHA256) {
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if(keylen != 2*256/8) return NULL;
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ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
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} else if(algo == LDNS_ECDSAP384SHA384) {
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if(keylen != 2*384/8) return NULL;
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ec = EC_KEY_new_by_curve_name(NID_secp384r1);
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} else ec = NULL;
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if(!ec) return NULL;
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if(keylen+1 > sizeof(buf)) { /* sanity check */
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EC_KEY_free(ec);
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return NULL;
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}
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/* prepend the 0x02 (from docs) (or actually 0x04 from implementation
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* of openssl) for uncompressed data */
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buf[0] = POINT_CONVERSION_UNCOMPRESSED;
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memmove(buf+1, key, keylen);
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if(!o2i_ECPublicKey(&ec, &pp, (int)keylen+1)) {
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EC_KEY_free(ec);
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return NULL;
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}
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evp_key = EVP_PKEY_new();
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if(!evp_key) {
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EC_KEY_free(ec);
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return NULL;
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}
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if (!EVP_PKEY_assign_EC_KEY(evp_key, ec)) {
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EVP_PKEY_free(evp_key);
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EC_KEY_free(ec);
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return NULL;
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}
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return evp_key;
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}
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#endif /* USE_ECDSA */
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int
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sldns_digest_evp(unsigned char* data, unsigned int len, unsigned char* dest,
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const EVP_MD* md)
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{
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EVP_MD_CTX* ctx;
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ctx = EVP_MD_CTX_create();
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if(!ctx)
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return 0;
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if(!EVP_DigestInit_ex(ctx, md, NULL) ||
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!EVP_DigestUpdate(ctx, data, len) ||
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!EVP_DigestFinal_ex(ctx, dest, NULL)) {
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EVP_MD_CTX_destroy(ctx);
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return 0;
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}
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EVP_MD_CTX_destroy(ctx);
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return 1;
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}
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#endif /* HAVE_SSL */
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