diff options
Diffstat (limited to 'crypto/ec/ec_ameth.c')
| -rw-r--r-- | crypto/ec/ec_ameth.c | 340 |
1 files changed, 339 insertions, 1 deletions
diff --git a/crypto/ec/ec_ameth.c b/crypto/ec/ec_ameth.c index 5cefb5ad303a..83e208cfe491 100644 --- a/crypto/ec/ec_ameth.c +++ b/crypto/ec/ec_ameth.c @@ -64,8 +64,12 @@ #ifndef OPENSSL_NO_CMS # include <openssl/cms.h> #endif +#include <openssl/asn1t.h> #include "asn1_locl.h" +static int ecdh_cms_decrypt(CMS_RecipientInfo *ri); +static int ecdh_cms_encrypt(CMS_RecipientInfo *ri); + static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key) { const EC_GROUP *group; @@ -580,10 +584,21 @@ static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) 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: - *(int *)arg2 = NID_sha1; + *(int *)arg2 = NID_sha256; return 2; default: @@ -625,3 +640,326 @@ const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = { old_ec_priv_decode, old_ec_priv_encode }; + +#ifndef OPENSSL_NO_CMS + +static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx, + X509_ALGOR *alg, ASN1_BIT_STRING *pubkey) +{ + ASN1_OBJECT *aoid; + int atype; + 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) + 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_data(pubkey); + if (!p || !plen) + goto err; + if (!o2i_ECPublicKey(&ecpeer, &p, plen)) + goto err; + pkpeer = EVP_PKEY_new(); + if (!pkpeer) + goto err; + EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer); + if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0) + rv = 1; + err: + if (ecpeer) + EC_KEY_free(ecpeer); + if (pkpeer) + 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_62) <= 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: + if (kekalg) + X509_ALGOR_free(kekalg); + if (der) + 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; + 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) + 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 paraneters 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_62; + if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0) + goto err; + } else + /* Uknown 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) + goto err; + wrap_alg->algorithm = OBJ_nid2obj(wrap_nid); + wrap_alg->parameter = ASN1_TYPE_new(); + if (!wrap_alg->parameter) + 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) + 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: + if (penc) + OPENSSL_free(penc); + if (wrap_alg) + X509_ALGOR_free(wrap_alg); + return rv; +} + +#endif |