Add support for ECDH KARI.
Add support for ECDH in enveloped data. The CMS ctrls for the EC ASN1 method decode/encode the appropriate parameters from the CMS ASN1 data and send appropriate data to the EC public key method.
This commit is contained in:
parent
25af7a5dbc
commit
88e20b8584
4 changed files with 402 additions and 2 deletions
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@ -1204,6 +1204,7 @@ void ERR_load_EC_strings(void);
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#define EC_R_INVALID_COMPRESSED_POINT 110
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#define EC_R_INVALID_COMPRESSION_BIT 109
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#define EC_R_INVALID_CURVE 141
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#define EC_R_INVALID_DIGEST 151
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#define EC_R_INVALID_DIGEST_TYPE 138
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#define EC_R_INVALID_ENCODING 102
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#define EC_R_INVALID_FIELD 103
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@ -63,8 +63,12 @@
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#ifndef OPENSSL_NO_CMS
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#include <openssl/cms.h>
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#endif
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#include <openssl/asn1t.h>
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#include "asn1_locl.h"
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static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
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static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
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static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
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{
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const EC_GROUP *group;
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@ -612,6 +616,17 @@ static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
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}
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return 1;
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case ASN1_PKEY_CTRL_CMS_ENVELOPE:
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if (arg1 == 1)
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return ecdh_cms_decrypt(arg2);
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else if (arg1 == 0)
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return ecdh_cms_encrypt(arg2);
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return -2;
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case ASN1_PKEY_CTRL_CMS_RI_TYPE:
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*(int *)arg2 = CMS_RECIPINFO_AGREE;
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return 1;
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#endif
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case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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@ -658,3 +673,365 @@ const EVP_PKEY_ASN1_METHOD eckey_asn1_meth =
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old_ec_priv_decode,
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old_ec_priv_encode
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};
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#ifndef OPENSSL_NO_CMS
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static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
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X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
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{
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ASN1_OBJECT *aoid;
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int atype;
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void *aval;
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int rv = 0;
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EVP_PKEY *pkpeer = NULL;
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EC_KEY *ecpeer = NULL;
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const unsigned char *p;
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int plen;
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X509_ALGOR_get0(&aoid, &atype, &aval, alg);
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if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
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goto err;
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/* If absent parameters get group from main key */
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if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL)
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{
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const EC_GROUP *grp;
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EVP_PKEY *pk;
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pk = EVP_PKEY_CTX_get0_pkey(pctx);
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if (!pk)
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goto err;
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grp = EC_KEY_get0_group(pk->pkey.ec);
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ecpeer = EC_KEY_new();
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if (!ecpeer)
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goto err;
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if (!EC_KEY_set_group(ecpeer, grp))
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goto err;
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}
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else
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{
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ecpeer = eckey_type2param(atype, aval);
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if (!ecpeer)
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goto err;
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}
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/* We have parameters now set public key */
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plen = ASN1_STRING_length(pubkey);
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p = ASN1_STRING_data(pubkey);
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if (!p || !plen)
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goto err;
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if (!o2i_ECPublicKey(&ecpeer, &p, plen))
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goto err;
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pkpeer = EVP_PKEY_new();
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if (!pkpeer)
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goto err;
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EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
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if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
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rv = 1;
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err:
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if (ecpeer)
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EC_KEY_free(ecpeer);
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if (pkpeer)
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EVP_PKEY_free(pkpeer);
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return rv;
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}
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/* Set KDF parameters based on KDF NID */
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static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
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{
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int kdf_nid, kdfmd_nid, cofactor;
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const EVP_MD *kdf_md;
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if (eckdf_nid == NID_undef)
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return 0;
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/* Lookup KDF type, cofactor mode and digest */
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if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
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return 0;
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if (kdf_nid == NID_dh_std_kdf)
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cofactor = 0;
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else if (kdf_nid == NID_dh_cofactor_kdf)
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cofactor = 1;
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else return 0;
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if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
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return 0;
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if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
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return 0;
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kdf_md = EVP_get_digestbynid(kdfmd_nid);
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if (!kdf_md)
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return 0;
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if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
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return 0;
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return 1;
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}
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/* Utilities to encode the ECC_CMS_SharedInfo structure used during key
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* derivation.
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*/
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typedef struct {
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X509_ALGOR *keyInfo;
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ASN1_OCTET_STRING *entityUInfo;
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ASN1_OCTET_STRING *suppPubInfo;
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} ECC_CMS_SharedInfo;
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ASN1_SEQUENCE(ECC_CMS_SharedInfo) = {
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ASN1_SIMPLE(ECC_CMS_SharedInfo, keyInfo, X509_ALGOR),
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ASN1_EXP_OPT(ECC_CMS_SharedInfo, entityUInfo, ASN1_OCTET_STRING, 0),
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ASN1_EXP_OPT(ECC_CMS_SharedInfo, suppPubInfo, ASN1_OCTET_STRING, 2),
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} ASN1_SEQUENCE_END(ECC_CMS_SharedInfo)
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static int ecdh_cms_set_ukm(EVP_PKEY_CTX *pctx,
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X509_ALGOR *kekalg,
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ASN1_OCTET_STRING *ukm,
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int keylen)
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{
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union {
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ECC_CMS_SharedInfo *pecsi;
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ASN1_VALUE *a;
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} intsi = {NULL};
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unsigned char *der = NULL;
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int plen;
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ASN1_OCTET_STRING oklen;
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unsigned char kl[4];
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ECC_CMS_SharedInfo ecsi;
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keylen <<= 3;
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kl[0] = (keylen >> 24) & 0xff;
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kl[1] = (keylen >> 16) & 0xff;
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kl[2] = (keylen >> 8) & 0xff;
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kl[3] = keylen & 0xff;
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oklen.length = 4;
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oklen.data = kl;
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oklen.type = V_ASN1_OCTET_STRING;
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oklen.flags = 0;
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ecsi.keyInfo = kekalg;
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ecsi.entityUInfo = ukm;
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ecsi.suppPubInfo = &oklen;
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intsi.pecsi = &ecsi;
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plen = ASN1_item_i2d(intsi.a, &der, ASN1_ITEM_rptr(ECC_CMS_SharedInfo));
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if (!der || !plen)
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goto err;
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if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
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goto err;
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return 1;
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err:
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if (der)
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OPENSSL_free(der);
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return 0;
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}
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static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
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{
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int rv = 0;
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X509_ALGOR *alg, *kekalg = NULL;
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ASN1_OCTET_STRING *ukm;
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const unsigned char *p;
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int plen, keylen;
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const EVP_CIPHER *kekcipher;
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EVP_CIPHER_CTX *kekctx;
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if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
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return 0;
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if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm)))
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{
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ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
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return 0;
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}
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if (alg->parameter->type != V_ASN1_SEQUENCE)
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return 0;
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p = alg->parameter->value.sequence->data;
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plen = alg->parameter->value.sequence->length;
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kekalg = d2i_X509_ALGOR(NULL, &p, plen);
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if (!kekalg)
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goto err;
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kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
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if (!kekctx)
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goto err;
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kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
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if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
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goto err;
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if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
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goto err;
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keylen = EVP_CIPHER_CTX_key_length(kekctx);
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if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
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goto err;
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if (!ecdh_cms_set_ukm(pctx, kekalg, ukm, keylen))
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goto err;
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rv = 1;
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err:
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if (kekalg)
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X509_ALGOR_free(kekalg);
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return rv;
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}
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static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
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{
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EVP_PKEY_CTX *pctx;
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pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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if (!pctx)
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return 0;
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/* See if we need to set peer key */
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if (!EVP_PKEY_CTX_get0_peerkey(pctx))
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{
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X509_ALGOR *alg;
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ASN1_BIT_STRING *pubkey;
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if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
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NULL, NULL, NULL))
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return 0;
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if (!alg || !pubkey)
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return 0;
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if (!ecdh_cms_set_peerkey(pctx, alg, pubkey))
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{
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ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
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return 0;
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}
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}
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/* Set ECDH derivation parameters and initialise unwrap context */
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if (!ecdh_cms_set_shared_info(pctx, ri))
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{
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ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
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return 0;
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}
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return 1;
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}
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static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
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{
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EVP_PKEY_CTX *pctx;
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EVP_PKEY *pkey;
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EVP_CIPHER_CTX *ctx;
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int keylen;
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X509_ALGOR *talg, *wrap_alg = NULL;
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ASN1_OBJECT *aoid;
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ASN1_BIT_STRING *pubkey;
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ASN1_STRING *wrap_str;
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ASN1_OCTET_STRING *ukm;
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unsigned char *penc = NULL;
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int penclen;
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int rv = 0;
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int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
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const EVP_MD *kdf_md;
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pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
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if (!pctx)
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return 0;
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/* Get ephemeral key */
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pkey = EVP_PKEY_CTX_get0_pkey(pctx);
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if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
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NULL, NULL, NULL))
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goto err;
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X509_ALGOR_get0(&aoid, NULL, NULL, talg);
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/* Is everything uninitialised? */
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if (aoid == OBJ_nid2obj(NID_undef))
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{
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EC_KEY *eckey = pkey->pkey.ec;
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/* Set the key */
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unsigned char *p;
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penclen = i2o_ECPublicKey(eckey, NULL);
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if (penclen <= 0)
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goto err;
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penc = OPENSSL_malloc(penclen);
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if (!penc)
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goto err;
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p = penc;
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penclen = i2o_ECPublicKey(eckey, &p);
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if (penclen <= 0)
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goto err;
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ASN1_STRING_set0(pubkey, penc, penclen);
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pubkey->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
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pubkey->flags|=ASN1_STRING_FLAG_BITS_LEFT;
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penc = NULL;
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X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
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V_ASN1_UNDEF, NULL);
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}
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/* See if custom paraneters set */
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kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
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if (kdf_type <= 0)
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goto err;
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if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
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goto err;
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ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
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if (ecdh_nid < 0)
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goto err;
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else if (ecdh_nid == 0)
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ecdh_nid = NID_dh_std_kdf;
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else if (ecdh_nid == 1)
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ecdh_nid = NID_dh_cofactor_kdf;
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if (kdf_type == EVP_PKEY_ECDH_KDF_NONE)
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{
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kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
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if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
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goto err;
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}
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else
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/* Uknown KDF */
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goto err;
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if (kdf_md == NULL)
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{
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/* Fixme later for better MD */
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kdf_md = EVP_sha1();
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if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
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goto err;
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}
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if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
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goto err;
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/* Lookup NID for KDF+cofactor+digest */
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if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
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goto err;
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/* Get wrap NID */
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ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
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wrap_nid = EVP_CIPHER_CTX_type(ctx);
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keylen = EVP_CIPHER_CTX_key_length(ctx);
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/* Package wrap algorithm in an AlgorithmIdentifier */
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wrap_alg = X509_ALGOR_new();
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if (!wrap_alg)
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goto err;
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X509_ALGOR_set0(wrap_alg, OBJ_nid2obj(wrap_nid), V_ASN1_UNDEF, NULL);
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if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
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goto err;
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if (!ecdh_cms_set_ukm(pctx, wrap_alg, ukm, keylen))
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goto err;
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/* Now need to wrap encoding of wrap AlgorithmIdentifier into
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* parameter of another AlgorithmIdentifier.
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*/
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penc = NULL;
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penclen = i2d_X509_ALGOR(wrap_alg, &penc);
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if (!penc || !penclen)
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goto err;
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wrap_str = ASN1_STRING_new();
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if (!wrap_str)
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goto err;
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ASN1_STRING_set0(wrap_str, penc, penclen);
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penc = NULL;
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X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
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rv = 1;
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err:
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if (penc)
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OPENSSL_free(penc);
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if (wrap_alg)
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X509_ALGOR_free(wrap_alg);
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return rv;
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}
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#endif
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@ -1,6 +1,6 @@
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/* crypto/ec/ec_err.c */
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/* ====================================================================
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* Copyright (c) 1999-2011 The OpenSSL Project. All rights reserved.
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* Copyright (c) 1999-2013 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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@ -76,6 +76,8 @@ static ERR_STRING_DATA EC_str_functs[]=
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{ERR_FUNC(EC_F_D2I_ECPKPARAMETERS), "d2i_ECPKParameters"},
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{ERR_FUNC(EC_F_D2I_ECPRIVATEKEY), "d2i_ECPrivateKey"},
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{ERR_FUNC(EC_F_DO_EC_KEY_PRINT), "DO_EC_KEY_PRINT"},
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{ERR_FUNC(EC_F_ECDH_CMS_DECRYPT), "ECDH_CMS_DECRYPT"},
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{ERR_FUNC(EC_F_ECDH_CMS_SET_SHARED_INFO), "ECDH_CMS_SET_SHARED_INFO"},
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{ERR_FUNC(EC_F_ECKEY_PARAM2TYPE), "ECKEY_PARAM2TYPE"},
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{ERR_FUNC(EC_F_ECKEY_PARAM_DECODE), "ECKEY_PARAM_DECODE"},
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{ERR_FUNC(EC_F_ECKEY_PRIV_DECODE), "ECKEY_PRIV_DECODE"},
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@ -229,6 +231,7 @@ static ERR_STRING_DATA EC_str_reasons[]=
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|||
{ERR_REASON(EC_R_INVALID_COMPRESSED_POINT),"invalid compressed point"},
|
||||
{ERR_REASON(EC_R_INVALID_COMPRESSION_BIT),"invalid compression bit"},
|
||||
{ERR_REASON(EC_R_INVALID_CURVE) ,"invalid curve"},
|
||||
{ERR_REASON(EC_R_INVALID_DIGEST) ,"invalid digest"},
|
||||
{ERR_REASON(EC_R_INVALID_DIGEST_TYPE) ,"invalid digest type"},
|
||||
{ERR_REASON(EC_R_INVALID_ENCODING) ,"invalid encoding"},
|
||||
{ERR_REASON(EC_R_INVALID_FIELD) ,"invalid field"},
|
||||
|
@ -237,6 +240,7 @@ static ERR_STRING_DATA EC_str_reasons[]=
|
|||
{ERR_REASON(EC_R_INVALID_PENTANOMIAL_BASIS),"invalid pentanomial basis"},
|
||||
{ERR_REASON(EC_R_INVALID_PRIVATE_KEY) ,"invalid private key"},
|
||||
{ERR_REASON(EC_R_INVALID_TRINOMIAL_BASIS),"invalid trinomial basis"},
|
||||
{ERR_REASON(EC_R_KDF_PARAMETER_ERROR) ,"kdf parameter error"},
|
||||
{ERR_REASON(EC_R_KEYS_NOT_SET) ,"keys not set"},
|
||||
{ERR_REASON(EC_R_MISSING_PARAMETERS) ,"missing parameters"},
|
||||
{ERR_REASON(EC_R_MISSING_PRIVATE_KEY) ,"missing private key"},
|
||||
|
@ -247,9 +251,11 @@ static ERR_STRING_DATA EC_str_reasons[]=
|
|||
{ERR_REASON(EC_R_NO_FIELD_MOD) ,"no field mod"},
|
||||
{ERR_REASON(EC_R_NO_PARAMETERS_SET) ,"no parameters set"},
|
||||
{ERR_REASON(EC_R_PASSED_NULL_PARAMETER) ,"passed null parameter"},
|
||||
{ERR_REASON(EC_R_PEER_KEY_ERROR) ,"peer key error"},
|
||||
{ERR_REASON(EC_R_PKPARAMETERS2GROUP_FAILURE),"pkparameters2group failure"},
|
||||
{ERR_REASON(EC_R_POINT_AT_INFINITY) ,"point at infinity"},
|
||||
{ERR_REASON(EC_R_POINT_IS_NOT_ON_CURVE) ,"point is not on curve"},
|
||||
{ERR_REASON(EC_R_SHARED_INFO_ERROR) ,"shared info error"},
|
||||
{ERR_REASON(EC_R_SLOT_FULL) ,"slot full"},
|
||||
{ERR_REASON(EC_R_UNDEFINED_GENERATOR) ,"undefined generator"},
|
||||
{ERR_REASON(EC_R_UNDEFINED_ORDER) ,"undefined order"},
|
||||
|
|
|
@ -319,7 +319,7 @@ static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
|
|||
case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
|
||||
if (p1 == -2)
|
||||
{
|
||||
if (dctx->co_key)
|
||||
if (dctx->cofactor_mode != -1)
|
||||
return dctx->cofactor_mode;
|
||||
else
|
||||
{
|
||||
|
@ -459,6 +459,22 @@ static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
|
|||
return -2;
|
||||
return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
|
||||
}
|
||||
else if (!strcmp(type, "ecdh_kdf_md"))
|
||||
{
|
||||
const EVP_MD *md;
|
||||
if (!(md = EVP_get_digestbyname(value)))
|
||||
{
|
||||
ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
|
||||
return 0;
|
||||
}
|
||||
return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
|
||||
}
|
||||
else if (!strcmp(type, "ecdh_cofactor_mode"))
|
||||
{
|
||||
int co_mode;
|
||||
co_mode = atoi(value);
|
||||
return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
|
||||
}
|
||||
|
||||
return -2;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue