| /* |
| * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include "internal/cryptlib.h" |
| #include <openssl/x509.h> |
| #include <openssl/ec.h> |
| #include <openssl/bn.h> |
| #include <openssl/cms.h> |
| #include <openssl/asn1t.h> |
| #include "crypto/asn1.h" |
| #include "crypto/evp.h" |
| #include "ec_local.h" |
| |
| #ifndef OPENSSL_NO_CMS |
| static int ecdh_cms_decrypt(CMS_RecipientInfo *ri); |
| static int ecdh_cms_encrypt(CMS_RecipientInfo *ri); |
| #endif |
| |
| static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key) |
| { |
| const EC_GROUP *group; |
| int nid; |
| if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) { |
| ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS); |
| return 0; |
| } |
| if (EC_GROUP_get_asn1_flag(group) |
| && (nid = EC_GROUP_get_curve_name(group))) |
| /* we have a 'named curve' => just set the OID */ |
| { |
| *ppval = OBJ_nid2obj(nid); |
| *pptype = V_ASN1_OBJECT; |
| } else { /* explicit parameters */ |
| |
| ASN1_STRING *pstr = NULL; |
| pstr = ASN1_STRING_new(); |
| if (pstr == NULL) |
| return 0; |
| pstr->length = i2d_ECParameters(ec_key, &pstr->data); |
| if (pstr->length <= 0) { |
| ASN1_STRING_free(pstr); |
| ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB); |
| return 0; |
| } |
| *ppval = pstr; |
| *pptype = V_ASN1_SEQUENCE; |
| } |
| return 1; |
| } |
| |
| static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) |
| { |
| EC_KEY *ec_key = pkey->pkey.ec; |
| void *pval = NULL; |
| int ptype; |
| unsigned char *penc = NULL, *p; |
| int penclen; |
| |
| if (!eckey_param2type(&ptype, &pval, ec_key)) { |
| ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB); |
| return 0; |
| } |
| penclen = i2o_ECPublicKey(ec_key, NULL); |
| if (penclen <= 0) |
| goto err; |
| penc = OPENSSL_malloc(penclen); |
| if (penc == NULL) |
| goto err; |
| p = penc; |
| penclen = i2o_ECPublicKey(ec_key, &p); |
| if (penclen <= 0) |
| goto err; |
| if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC), |
| ptype, pval, penc, penclen)) |
| return 1; |
| err: |
| if (ptype == V_ASN1_OBJECT) |
| ASN1_OBJECT_free(pval); |
| else |
| ASN1_STRING_free(pval); |
| OPENSSL_free(penc); |
| return 0; |
| } |
| |
| static EC_KEY *eckey_type2param(int ptype, const void *pval) |
| { |
| EC_KEY *eckey = NULL; |
| EC_GROUP *group = NULL; |
| |
| if (ptype == V_ASN1_SEQUENCE) { |
| const ASN1_STRING *pstr = pval; |
| const unsigned char *pm = pstr->data; |
| int pmlen = pstr->length; |
| |
| if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) { |
| ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR); |
| goto ecerr; |
| } |
| } else if (ptype == V_ASN1_OBJECT) { |
| const ASN1_OBJECT *poid = pval; |
| |
| /* |
| * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID |
| */ |
| if ((eckey = EC_KEY_new()) == NULL) { |
| ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE); |
| goto ecerr; |
| } |
| group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid)); |
| if (group == NULL) |
| goto ecerr; |
| EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE); |
| if (EC_KEY_set_group(eckey, group) == 0) |
| goto ecerr; |
| EC_GROUP_free(group); |
| } else { |
| ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR); |
| goto ecerr; |
| } |
| |
| return eckey; |
| |
| ecerr: |
| EC_KEY_free(eckey); |
| EC_GROUP_free(group); |
| return NULL; |
| } |
| |
| static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) |
| { |
| const unsigned char *p = NULL; |
| const void *pval; |
| int ptype, pklen; |
| EC_KEY *eckey = NULL; |
| X509_ALGOR *palg; |
| |
| if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) |
| return 0; |
| X509_ALGOR_get0(NULL, &ptype, &pval, palg); |
| |
| eckey = eckey_type2param(ptype, pval); |
| |
| if (!eckey) { |
| ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB); |
| return 0; |
| } |
| |
| /* We have parameters now set public key */ |
| if (!o2i_ECPublicKey(&eckey, &p, pklen)) { |
| ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR); |
| goto ecerr; |
| } |
| |
| EVP_PKEY_assign_EC_KEY(pkey, eckey); |
| return 1; |
| |
| ecerr: |
| EC_KEY_free(eckey); |
| return 0; |
| } |
| |
| static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
| { |
| int r; |
| const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec); |
| const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec), |
| *pb = EC_KEY_get0_public_key(b->pkey.ec); |
| if (group == NULL || pa == NULL || pb == NULL) |
| return -2; |
| r = EC_POINT_cmp(group, pa, pb, NULL); |
| if (r == 0) |
| return 1; |
| if (r == 1) |
| return 0; |
| return -2; |
| } |
| |
| static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) |
| { |
| const unsigned char *p = NULL; |
| const void *pval; |
| int ptype, pklen; |
| EC_KEY *eckey = NULL; |
| const X509_ALGOR *palg; |
| |
| if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) |
| return 0; |
| X509_ALGOR_get0(NULL, &ptype, &pval, palg); |
| |
| eckey = eckey_type2param(ptype, pval); |
| |
| if (!eckey) |
| goto ecliberr; |
| |
| /* We have parameters now set private key */ |
| if (!d2i_ECPrivateKey(&eckey, &p, pklen)) { |
| ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR); |
| goto ecerr; |
| } |
| |
| EVP_PKEY_assign_EC_KEY(pkey, eckey); |
| return 1; |
| |
| ecliberr: |
| ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB); |
| ecerr: |
| EC_KEY_free(eckey); |
| return 0; |
| } |
| |
| static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) |
| { |
| EC_KEY ec_key = *(pkey->pkey.ec); |
| unsigned char *ep, *p; |
| int eplen, ptype; |
| void *pval; |
| unsigned int old_flags; |
| |
| if (!eckey_param2type(&ptype, &pval, &ec_key)) { |
| ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR); |
| return 0; |
| } |
| |
| /* set the private key */ |
| |
| /* |
| * do not include the parameters in the SEC1 private key see PKCS#11 |
| * 12.11 |
| */ |
| old_flags = EC_KEY_get_enc_flags(&ec_key); |
| EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS); |
| |
| eplen = i2d_ECPrivateKey(&ec_key, NULL); |
| if (!eplen) { |
| ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); |
| return 0; |
| } |
| ep = OPENSSL_malloc(eplen); |
| if (ep == NULL) { |
| ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| p = ep; |
| if (!i2d_ECPrivateKey(&ec_key, &p)) { |
| OPENSSL_free(ep); |
| ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB); |
| return 0; |
| } |
| |
| if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0, |
| ptype, pval, ep, eplen)) { |
| OPENSSL_free(ep); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static int int_ec_size(const EVP_PKEY *pkey) |
| { |
| return ECDSA_size(pkey->pkey.ec); |
| } |
| |
| static int ec_bits(const EVP_PKEY *pkey) |
| { |
| return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec)); |
| } |
| |
| static int ec_security_bits(const EVP_PKEY *pkey) |
| { |
| int ecbits = ec_bits(pkey); |
| if (ecbits >= 512) |
| return 256; |
| if (ecbits >= 384) |
| return 192; |
| if (ecbits >= 256) |
| return 128; |
| if (ecbits >= 224) |
| return 112; |
| if (ecbits >= 160) |
| return 80; |
| return ecbits / 2; |
| } |
| |
| static int ec_missing_parameters(const EVP_PKEY *pkey) |
| { |
| if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL) |
| return 1; |
| return 0; |
| } |
| |
| static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) |
| { |
| EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec)); |
| |
| if (group == NULL) |
| return 0; |
| if (to->pkey.ec == NULL) { |
| to->pkey.ec = EC_KEY_new(); |
| if (to->pkey.ec == NULL) |
| goto err; |
| } |
| if (EC_KEY_set_group(to->pkey.ec, group) == 0) |
| goto err; |
| EC_GROUP_free(group); |
| return 1; |
| err: |
| EC_GROUP_free(group); |
| return 0; |
| } |
| |
| static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) |
| { |
| const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec), |
| *group_b = EC_KEY_get0_group(b->pkey.ec); |
| if (group_a == NULL || group_b == NULL) |
| return -2; |
| if (EC_GROUP_cmp(group_a, group_b, NULL)) |
| return 0; |
| else |
| return 1; |
| } |
| |
| static void int_ec_free(EVP_PKEY *pkey) |
| { |
| EC_KEY_free(pkey->pkey.ec); |
| } |
| |
| typedef enum { |
| EC_KEY_PRINT_PRIVATE, |
| EC_KEY_PRINT_PUBLIC, |
| EC_KEY_PRINT_PARAM |
| } ec_print_t; |
| |
| static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype) |
| { |
| const char *ecstr; |
| unsigned char *priv = NULL, *pub = NULL; |
| size_t privlen = 0, publen = 0; |
| int ret = 0; |
| const EC_GROUP *group; |
| |
| if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) { |
| ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) { |
| publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL); |
| if (publen == 0) |
| goto err; |
| } |
| |
| if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) { |
| privlen = EC_KEY_priv2buf(x, &priv); |
| if (privlen == 0) |
| goto err; |
| } |
| |
| if (ktype == EC_KEY_PRINT_PRIVATE) |
| ecstr = "Private-Key"; |
| else if (ktype == EC_KEY_PRINT_PUBLIC) |
| ecstr = "Public-Key"; |
| else |
| ecstr = "ECDSA-Parameters"; |
| |
| if (!BIO_indent(bp, off, 128)) |
| goto err; |
| if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, |
| EC_GROUP_order_bits(group)) <= 0) |
| goto err; |
| |
| if (privlen != 0) { |
| if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0) |
| goto err; |
| if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0) |
| goto err; |
| } |
| |
| if (publen != 0) { |
| if (BIO_printf(bp, "%*spub:\n", off, "") <= 0) |
| goto err; |
| if (ASN1_buf_print(bp, pub, publen, off + 4) == 0) |
| goto err; |
| } |
| |
| if (!ECPKParameters_print(bp, group, off)) |
| goto err; |
| ret = 1; |
| err: |
| if (!ret) |
| ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB); |
| OPENSSL_clear_free(priv, privlen); |
| OPENSSL_free(pub); |
| return ret; |
| } |
| |
| static int eckey_param_decode(EVP_PKEY *pkey, |
| const unsigned char **pder, int derlen) |
| { |
| EC_KEY *eckey; |
| |
| if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) { |
| ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB); |
| return 0; |
| } |
| EVP_PKEY_assign_EC_KEY(pkey, eckey); |
| return 1; |
| } |
| |
| static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder) |
| { |
| return i2d_ECParameters(pkey->pkey.ec, pder); |
| } |
| |
| static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| ASN1_PCTX *ctx) |
| { |
| return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM); |
| } |
| |
| static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| ASN1_PCTX *ctx) |
| { |
| return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC); |
| } |
| |
| static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, |
| ASN1_PCTX *ctx) |
| { |
| return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE); |
| } |
| |
| static int old_ec_priv_decode(EVP_PKEY *pkey, |
| const unsigned char **pder, int derlen) |
| { |
| EC_KEY *ec; |
| |
| if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) { |
| ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR); |
| return 0; |
| } |
| EVP_PKEY_assign_EC_KEY(pkey, ec); |
| return 1; |
| } |
| |
| static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) |
| { |
| return i2d_ECPrivateKey(pkey->pkey.ec, pder); |
| } |
| |
| static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
| { |
| switch (op) { |
| case ASN1_PKEY_CTRL_PKCS7_SIGN: |
| if (arg1 == 0) { |
| int snid, hnid; |
| X509_ALGOR *alg1, *alg2; |
| PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2); |
| if (alg1 == NULL || alg1->algorithm == NULL) |
| return -1; |
| hnid = OBJ_obj2nid(alg1->algorithm); |
| if (hnid == NID_undef) |
| return -1; |
| if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey))) |
| return -1; |
| X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0); |
| } |
| return 1; |
| #ifndef OPENSSL_NO_CMS |
| case ASN1_PKEY_CTRL_CMS_SIGN: |
| if (arg1 == 0) { |
| int snid, hnid; |
| X509_ALGOR *alg1, *alg2; |
| CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2); |
| if (alg1 == NULL || alg1->algorithm == NULL) |
| return -1; |
| hnid = OBJ_obj2nid(alg1->algorithm); |
| if (hnid == NID_undef) |
| return -1; |
| if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey))) |
| return -1; |
| X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0); |
| } |
| return 1; |
| |
| case ASN1_PKEY_CTRL_CMS_ENVELOPE: |
| if (arg1 == 1) |
| return ecdh_cms_decrypt(arg2); |
| else if (arg1 == 0) |
| return ecdh_cms_encrypt(arg2); |
| return -2; |
| |
| case ASN1_PKEY_CTRL_CMS_RI_TYPE: |
| *(int *)arg2 = CMS_RECIPINFO_AGREE; |
| return 1; |
| #endif |
| |
| case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
| if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) { |
| /* For SM2, the only valid digest-alg is SM3 */ |
| *(int *)arg2 = NID_sm3; |
| } else { |
| *(int *)arg2 = NID_sha256; |
| } |
| return 1; |
| |
| case ASN1_PKEY_CTRL_SET1_TLS_ENCPT: |
| return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL); |
| |
| case ASN1_PKEY_CTRL_GET1_TLS_ENCPT: |
| return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey), |
| POINT_CONVERSION_UNCOMPRESSED, arg2, NULL); |
| |
| default: |
| return -2; |
| |
| } |
| |
| } |
| |
| static int ec_pkey_check(const EVP_PKEY *pkey) |
| { |
| EC_KEY *eckey = pkey->pkey.ec; |
| |
| /* stay consistent to what EVP_PKEY_check demands */ |
| if (eckey->priv_key == NULL) { |
| ECerr(EC_F_EC_PKEY_CHECK, EC_R_MISSING_PRIVATE_KEY); |
| return 0; |
| } |
| |
| return EC_KEY_check_key(eckey); |
| } |
| |
| static int ec_pkey_public_check(const EVP_PKEY *pkey) |
| { |
| EC_KEY *eckey = pkey->pkey.ec; |
| |
| /* |
| * Note: it unnecessary to check eckey->pub_key here since |
| * it will be checked in EC_KEY_check_key(). In fact, the |
| * EC_KEY_check_key() mainly checks the public key, and checks |
| * the private key optionally (only if there is one). So if |
| * someone passes a whole EC key (public + private), this |
| * will also work... |
| */ |
| |
| return EC_KEY_check_key(eckey); |
| } |
| |
| static int ec_pkey_param_check(const EVP_PKEY *pkey) |
| { |
| EC_KEY *eckey = pkey->pkey.ec; |
| |
| /* stay consistent to what EVP_PKEY_check demands */ |
| if (eckey->group == NULL) { |
| ECerr(EC_F_EC_PKEY_PARAM_CHECK, EC_R_MISSING_PARAMETERS); |
| return 0; |
| } |
| |
| return EC_GROUP_check(eckey->group, NULL); |
| } |
| |
| const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = { |
| EVP_PKEY_EC, |
| EVP_PKEY_EC, |
| 0, |
| "EC", |
| "OpenSSL EC algorithm", |
| |
| eckey_pub_decode, |
| eckey_pub_encode, |
| eckey_pub_cmp, |
| eckey_pub_print, |
| |
| eckey_priv_decode, |
| eckey_priv_encode, |
| eckey_priv_print, |
| |
| int_ec_size, |
| ec_bits, |
| ec_security_bits, |
| |
| eckey_param_decode, |
| eckey_param_encode, |
| ec_missing_parameters, |
| ec_copy_parameters, |
| ec_cmp_parameters, |
| eckey_param_print, |
| 0, |
| |
| int_ec_free, |
| ec_pkey_ctrl, |
| old_ec_priv_decode, |
| old_ec_priv_encode, |
| |
| 0, 0, 0, |
| |
| ec_pkey_check, |
| ec_pkey_public_check, |
| ec_pkey_param_check |
| }; |
| |
| #if !defined(OPENSSL_NO_SM2) |
| const EVP_PKEY_ASN1_METHOD sm2_asn1_meth = { |
| EVP_PKEY_SM2, |
| EVP_PKEY_EC, |
| ASN1_PKEY_ALIAS |
| }; |
| #endif |
| |
| int EC_KEY_print(BIO *bp, const EC_KEY *x, int off) |
| { |
| int private = EC_KEY_get0_private_key(x) != NULL; |
| |
| return do_EC_KEY_print(bp, x, off, |
| private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC); |
| } |
| |
| int ECParameters_print(BIO *bp, const EC_KEY *x) |
| { |
| return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM); |
| } |
| |
| #ifndef OPENSSL_NO_CMS |
| |
| static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx, |
| X509_ALGOR *alg, ASN1_BIT_STRING *pubkey) |
| { |
| const ASN1_OBJECT *aoid; |
| int atype; |
| const void *aval; |
| int rv = 0; |
| EVP_PKEY *pkpeer = NULL; |
| EC_KEY *ecpeer = NULL; |
| const unsigned char *p; |
| int plen; |
| X509_ALGOR_get0(&aoid, &atype, &aval, alg); |
| if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey) |
| goto err; |
| /* If absent parameters get group from main key */ |
| if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) { |
| const EC_GROUP *grp; |
| EVP_PKEY *pk; |
| pk = EVP_PKEY_CTX_get0_pkey(pctx); |
| if (!pk) |
| goto err; |
| grp = EC_KEY_get0_group(pk->pkey.ec); |
| ecpeer = EC_KEY_new(); |
| if (ecpeer == NULL) |
| goto err; |
| if (!EC_KEY_set_group(ecpeer, grp)) |
| goto err; |
| } else { |
| ecpeer = eckey_type2param(atype, aval); |
| if (!ecpeer) |
| goto err; |
| } |
| /* We have parameters now set public key */ |
| plen = ASN1_STRING_length(pubkey); |
| p = ASN1_STRING_get0_data(pubkey); |
| if (!p || !plen) |
| goto err; |
| if (!o2i_ECPublicKey(&ecpeer, &p, plen)) |
| goto err; |
| pkpeer = EVP_PKEY_new(); |
| if (pkpeer == NULL) |
| goto err; |
| EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer); |
| if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0) |
| rv = 1; |
| err: |
| EC_KEY_free(ecpeer); |
| EVP_PKEY_free(pkpeer); |
| return rv; |
| } |
| |
| /* Set KDF parameters based on KDF NID */ |
| static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid) |
| { |
| int kdf_nid, kdfmd_nid, cofactor; |
| const EVP_MD *kdf_md; |
| if (eckdf_nid == NID_undef) |
| return 0; |
| |
| /* Lookup KDF type, cofactor mode and digest */ |
| if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid)) |
| return 0; |
| |
| if (kdf_nid == NID_dh_std_kdf) |
| cofactor = 0; |
| else if (kdf_nid == NID_dh_cofactor_kdf) |
| cofactor = 1; |
| else |
| return 0; |
| |
| if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0) |
| return 0; |
| |
| if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_63) <= 0) |
| return 0; |
| |
| kdf_md = EVP_get_digestbynid(kdfmd_nid); |
| if (!kdf_md) |
| return 0; |
| |
| if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0) |
| return 0; |
| return 1; |
| } |
| |
| static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri) |
| { |
| int rv = 0; |
| |
| X509_ALGOR *alg, *kekalg = NULL; |
| ASN1_OCTET_STRING *ukm; |
| const unsigned char *p; |
| unsigned char *der = NULL; |
| int plen, keylen; |
| const EVP_CIPHER *kekcipher; |
| EVP_CIPHER_CTX *kekctx; |
| |
| if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm)) |
| return 0; |
| |
| if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) { |
| ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR); |
| return 0; |
| } |
| |
| if (alg->parameter->type != V_ASN1_SEQUENCE) |
| return 0; |
| |
| p = alg->parameter->value.sequence->data; |
| plen = alg->parameter->value.sequence->length; |
| kekalg = d2i_X509_ALGOR(NULL, &p, plen); |
| if (!kekalg) |
| goto err; |
| kekctx = CMS_RecipientInfo_kari_get0_ctx(ri); |
| if (!kekctx) |
| goto err; |
| kekcipher = EVP_get_cipherbyobj(kekalg->algorithm); |
| if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE) |
| goto err; |
| if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL)) |
| goto err; |
| if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) |
| goto err; |
| |
| keylen = EVP_CIPHER_CTX_key_length(kekctx); |
| if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0) |
| goto err; |
| |
| plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen); |
| |
| if (!plen) |
| goto err; |
| |
| if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0) |
| goto err; |
| der = NULL; |
| |
| rv = 1; |
| err: |
| X509_ALGOR_free(kekalg); |
| OPENSSL_free(der); |
| return rv; |
| } |
| |
| static int ecdh_cms_decrypt(CMS_RecipientInfo *ri) |
| { |
| EVP_PKEY_CTX *pctx; |
| pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); |
| if (!pctx) |
| return 0; |
| /* See if we need to set peer key */ |
| if (!EVP_PKEY_CTX_get0_peerkey(pctx)) { |
| X509_ALGOR *alg; |
| ASN1_BIT_STRING *pubkey; |
| if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey, |
| NULL, NULL, NULL)) |
| return 0; |
| if (!alg || !pubkey) |
| return 0; |
| if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) { |
| ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR); |
| return 0; |
| } |
| } |
| /* Set ECDH derivation parameters and initialise unwrap context */ |
| if (!ecdh_cms_set_shared_info(pctx, ri)) { |
| ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int ecdh_cms_encrypt(CMS_RecipientInfo *ri) |
| { |
| EVP_PKEY_CTX *pctx; |
| EVP_PKEY *pkey; |
| EVP_CIPHER_CTX *ctx; |
| int keylen; |
| X509_ALGOR *talg, *wrap_alg = NULL; |
| const ASN1_OBJECT *aoid; |
| ASN1_BIT_STRING *pubkey; |
| ASN1_STRING *wrap_str; |
| ASN1_OCTET_STRING *ukm; |
| unsigned char *penc = NULL; |
| int penclen; |
| int rv = 0; |
| int ecdh_nid, kdf_type, kdf_nid, wrap_nid; |
| const EVP_MD *kdf_md; |
| pctx = CMS_RecipientInfo_get0_pkey_ctx(ri); |
| if (!pctx) |
| return 0; |
| /* Get ephemeral key */ |
| pkey = EVP_PKEY_CTX_get0_pkey(pctx); |
| if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey, |
| NULL, NULL, NULL)) |
| goto err; |
| X509_ALGOR_get0(&aoid, NULL, NULL, talg); |
| /* Is everything uninitialised? */ |
| if (aoid == OBJ_nid2obj(NID_undef)) { |
| |
| EC_KEY *eckey = pkey->pkey.ec; |
| /* Set the key */ |
| unsigned char *p; |
| |
| penclen = i2o_ECPublicKey(eckey, NULL); |
| if (penclen <= 0) |
| goto err; |
| penc = OPENSSL_malloc(penclen); |
| if (penc == NULL) |
| goto err; |
| p = penc; |
| penclen = i2o_ECPublicKey(eckey, &p); |
| if (penclen <= 0) |
| goto err; |
| ASN1_STRING_set0(pubkey, penc, penclen); |
| pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); |
| pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT; |
| |
| penc = NULL; |
| X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), |
| V_ASN1_UNDEF, NULL); |
| } |
| |
| /* See if custom parameters set */ |
| kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx); |
| if (kdf_type <= 0) |
| goto err; |
| if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md)) |
| goto err; |
| ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx); |
| if (ecdh_nid < 0) |
| goto err; |
| else if (ecdh_nid == 0) |
| ecdh_nid = NID_dh_std_kdf; |
| else if (ecdh_nid == 1) |
| ecdh_nid = NID_dh_cofactor_kdf; |
| |
| if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) { |
| kdf_type = EVP_PKEY_ECDH_KDF_X9_63; |
| if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0) |
| goto err; |
| } else |
| /* Unknown KDF */ |
| goto err; |
| if (kdf_md == NULL) { |
| /* Fixme later for better MD */ |
| kdf_md = EVP_sha1(); |
| if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0) |
| goto err; |
| } |
| |
| if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm)) |
| goto err; |
| |
| /* Lookup NID for KDF+cofactor+digest */ |
| |
| if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid)) |
| goto err; |
| /* Get wrap NID */ |
| ctx = CMS_RecipientInfo_kari_get0_ctx(ri); |
| wrap_nid = EVP_CIPHER_CTX_type(ctx); |
| keylen = EVP_CIPHER_CTX_key_length(ctx); |
| |
| /* Package wrap algorithm in an AlgorithmIdentifier */ |
| |
| wrap_alg = X509_ALGOR_new(); |
| if (wrap_alg == NULL) |
| goto err; |
| wrap_alg->algorithm = OBJ_nid2obj(wrap_nid); |
| wrap_alg->parameter = ASN1_TYPE_new(); |
| if (wrap_alg->parameter == NULL) |
| goto err; |
| if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0) |
| goto err; |
| if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) { |
| ASN1_TYPE_free(wrap_alg->parameter); |
| wrap_alg->parameter = NULL; |
| } |
| |
| if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0) |
| goto err; |
| |
| penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen); |
| |
| if (!penclen) |
| goto err; |
| |
| if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0) |
| goto err; |
| penc = NULL; |
| |
| /* |
| * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter |
| * of another AlgorithmIdentifier. |
| */ |
| penclen = i2d_X509_ALGOR(wrap_alg, &penc); |
| if (!penc || !penclen) |
| goto err; |
| wrap_str = ASN1_STRING_new(); |
| if (wrap_str == NULL) |
| goto err; |
| ASN1_STRING_set0(wrap_str, penc, penclen); |
| penc = NULL; |
| X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str); |
| |
| rv = 1; |
| |
| err: |
| OPENSSL_free(penc); |
| X509_ALGOR_free(wrap_alg); |
| return rv; |
| } |
| |
| #endif |
