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cf33379997
This required refactoring a number of functions from the diverse EVP_PKEY_ASN1_METHOD implementations to become shared backend functions. It also meant modifying a few of them to return pointers to our internal RSA / DSA/ DH / EC_KEY, ... structures instead of manipulating an EVP_PKEY pointer directly, letting the caller do the latter. Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14314)
130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* DSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <openssl/core_names.h>
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#include <openssl/err.h>
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#include "crypto/dsa.h"
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/*
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* The intention with the "backend" source file is to offer backend support
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* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
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* implementations alike.
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*/
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int ossl_dsa_key_fromdata(DSA *dsa, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *param_priv_key, *param_pub_key;
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BIGNUM *priv_key = NULL, *pub_key = NULL;
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if (dsa == NULL)
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return 0;
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param_priv_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
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param_pub_key =
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OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
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/* It's ok if neither half is present */
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if (param_priv_key == NULL && param_pub_key == NULL)
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return 1;
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if (param_pub_key != NULL && !OSSL_PARAM_get_BN(param_pub_key, &pub_key))
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goto err;
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if (param_priv_key != NULL && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
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goto err;
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if (!DSA_set0_key(dsa, pub_key, priv_key))
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goto err;
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return 1;
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err:
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BN_clear_free(priv_key);
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BN_free(pub_key);
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return 0;
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}
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#ifndef FIPS_MODULE
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DSA *ossl_dsa_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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const unsigned char *p, *pm;
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int pklen, pmlen;
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int ptype;
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const void *pval;
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const ASN1_STRING *pstr;
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const X509_ALGOR *palg;
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ASN1_INTEGER *privkey = NULL;
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const BIGNUM *dsa_p, *dsa_g;
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BIGNUM *dsa_pubkey = NULL, *dsa_privkey = NULL;
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BN_CTX *ctx = NULL;
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DSA *dsa = NULL;
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if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8inf))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
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goto decerr;
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if (privkey->type == V_ASN1_NEG_INTEGER || ptype != V_ASN1_SEQUENCE)
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goto decerr;
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pstr = pval;
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pm = pstr->data;
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pmlen = pstr->length;
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if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL)
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goto decerr;
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/* We have parameters now set private key */
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if ((dsa_privkey = BN_secure_new()) == NULL
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|| !ASN1_INTEGER_to_BN(privkey, dsa_privkey)) {
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ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
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goto dsaerr;
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}
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/* Calculate public key */
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if ((dsa_pubkey = BN_new()) == NULL) {
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ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
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goto dsaerr;
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}
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if ((ctx = BN_CTX_new()) == NULL) {
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ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
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goto dsaerr;
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}
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dsa_p = DSA_get0_p(dsa);
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dsa_g = DSA_get0_g(dsa);
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BN_set_flags(dsa_privkey, BN_FLG_CONSTTIME);
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if (!BN_mod_exp(dsa_pubkey, dsa_g, dsa_privkey, dsa_p, ctx)) {
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ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR);
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goto dsaerr;
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}
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DSA_set0_key(dsa, dsa_pubkey, dsa_privkey);
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goto done;
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decerr:
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ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR);
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dsaerr:
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BN_free(dsa_privkey);
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BN_free(dsa_pubkey);
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DSA_free(dsa);
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dsa = NULL;
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done:
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BN_CTX_free(ctx);
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ASN1_STRING_clear_free(privkey);
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return dsa;
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}
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#endif
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