/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project * 2006. */ /* ==================================================================== * Copyright (c) 2006 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). */ #include <openssl_grpc/evp.h> #include <openssl_grpc/digest.h> #include <openssl_grpc/bn.h> #include <openssl_grpc/bytestring.h> #include <openssl_grpc/dsa.h> #include <openssl_grpc/err.h> #include "internal.h" static int dsa_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) { // See RFC 3279, section 2.3.2. // Parameters may or may not be present. DSA *dsa; if (CBS_len(params) == 0) { dsa = DSA_new(); if (dsa == NULL) { return 0; } } else { dsa = DSA_parse_parameters(params); if (dsa == NULL || CBS_len(params) != 0) { OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR); goto err; } } dsa->pub_key = BN_new(); if (dsa->pub_key == NULL) { goto err; } if (!BN_parse_asn1_unsigned(key, dsa->pub_key) || CBS_len(key) != 0) { OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR); goto err; } EVP_PKEY_assign_DSA(out, dsa); return 1; err: DSA_free(dsa); return 0; } static int dsa_pub_encode(CBB *out, const EVP_PKEY *key) { const DSA *dsa = key->pkey.dsa; const int has_params = dsa->p != NULL && dsa->q != NULL && dsa->g != NULL; // See RFC 5480, section 2. CBB spki, algorithm, oid, key_bitstring; if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) || !CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) || !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) || !CBB_add_bytes(&oid, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) || (has_params && !DSA_marshal_parameters(&algorithm, dsa)) || !CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) || !CBB_add_u8(&key_bitstring, 0 /* padding */) || !BN_marshal_asn1(&key_bitstring, dsa->pub_key) || !CBB_flush(out)) { OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR); return 0; } return 1; } static int dsa_priv_decode(EVP_PKEY *out, CBS *params, CBS *key) { // See PKCS#11, v2.40, section 2.5. // Decode parameters. BN_CTX *ctx = NULL; DSA *dsa = DSA_parse_parameters(params); if (dsa == NULL || CBS_len(params) != 0) { OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR); goto err; } dsa->priv_key = BN_new(); dsa->pub_key = BN_new(); if (dsa->priv_key == NULL || dsa->pub_key == NULL) { goto err; } // Decode the key. To avoid DoS attacks when importing private keys, we bound // |dsa->priv_key| against |dsa->q|, which itself bound by // |DSA_parse_parameters|. (We cannot call |BN_num_bits| on |dsa->priv_key|. // That would leak a secret bit width.) if (!BN_parse_asn1_unsigned(key, dsa->priv_key) || CBS_len(key) != 0 || BN_cmp(dsa->priv_key, dsa->q) >= 0) { OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR); goto err; } // Calculate the public key. ctx = BN_CTX_new(); if (ctx == NULL || !BN_mod_exp_mont_consttime(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx, NULL)) { goto err; } BN_CTX_free(ctx); EVP_PKEY_assign_DSA(out, dsa); return 1; err: BN_CTX_free(ctx); DSA_free(dsa); return 0; } static int dsa_priv_encode(CBB *out, const EVP_PKEY *key) { const DSA *dsa = key->pkey.dsa; if (dsa == NULL || dsa->priv_key == NULL) { OPENSSL_PUT_ERROR(EVP, EVP_R_MISSING_PARAMETERS); return 0; } // See PKCS#11, v2.40, section 2.5. CBB pkcs8, algorithm, oid, private_key; if (!CBB_add_asn1(out, &pkcs8, CBS_ASN1_SEQUENCE) || !CBB_add_asn1_uint64(&pkcs8, 0 /* version */) || !CBB_add_asn1(&pkcs8, &algorithm, CBS_ASN1_SEQUENCE) || !CBB_add_asn1(&algorithm, &oid, CBS_ASN1_OBJECT) || !CBB_add_bytes(&oid, dsa_asn1_meth.oid, dsa_asn1_meth.oid_len) || !DSA_marshal_parameters(&algorithm, dsa) || !CBB_add_asn1(&pkcs8, &private_key, CBS_ASN1_OCTETSTRING) || !BN_marshal_asn1(&private_key, dsa->priv_key) || !CBB_flush(out)) { OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR); return 0; } return 1; } static int int_dsa_size(const EVP_PKEY *pkey) { return DSA_size(pkey->pkey.dsa); } static int dsa_bits(const EVP_PKEY *pkey) { return BN_num_bits(pkey->pkey.dsa->p); } static int dsa_missing_parameters(const EVP_PKEY *pkey) { DSA *dsa; dsa = pkey->pkey.dsa; if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) { return 1; } return 0; } static int dup_bn_into(BIGNUM **out, BIGNUM *src) { BIGNUM *a; a = BN_dup(src); if (a == NULL) { return 0; } BN_free(*out); *out = a; return 1; } static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) { if (!dup_bn_into(&to->pkey.dsa->p, from->pkey.dsa->p) || !dup_bn_into(&to->pkey.dsa->q, from->pkey.dsa->q) || !dup_bn_into(&to->pkey.dsa->g, from->pkey.dsa->g)) { return 0; } return 1; } static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) { return BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) == 0 && BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) == 0 && BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g) == 0; } static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) { return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0; } static void int_dsa_free(EVP_PKEY *pkey) { DSA_free(pkey->pkey.dsa); } const EVP_PKEY_ASN1_METHOD dsa_asn1_meth = { EVP_PKEY_DSA, // 1.2.840.10040.4.1 {0x2a, 0x86, 0x48, 0xce, 0x38, 0x04, 0x01}, 7, dsa_pub_decode, dsa_pub_encode, dsa_pub_cmp, dsa_priv_decode, dsa_priv_encode, NULL /* set_priv_raw */, NULL /* set_pub_raw */, NULL /* get_priv_raw */, NULL /* get_pub_raw */, NULL /* pkey_opaque */, int_dsa_size, dsa_bits, dsa_missing_parameters, dsa_copy_parameters, dsa_cmp_parameters, int_dsa_free, };