/* * Copyright 2006-2020 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 */ /* * DSA low level APIs are deprecated for public use, but still ok for * internal use. */ #include "internal/deprecated.h" #include #include #include #include #include #include #include "internal/cryptlib.h" #include "crypto/asn1.h" #include "crypto/dsa.h" #include "crypto/evp.h" #include "internal/ffc.h" #include "dsa_local.h" static int dsa_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey) { const unsigned char *p, *pm; int pklen, pmlen; int ptype; const void *pval; const ASN1_STRING *pstr; X509_ALGOR *palg; ASN1_INTEGER *public_key = NULL; DSA *dsa = NULL; if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) return 0; X509_ALGOR_get0(NULL, &ptype, &pval, palg); if (ptype == V_ASN1_SEQUENCE) { pstr = pval; pm = pstr->data; pmlen = pstr->length; if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) { ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR); goto err; } } else if ((ptype == V_ASN1_NULL) || (ptype == V_ASN1_UNDEF)) { if ((dsa = DSA_new()) == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } } else { ERR_raise(ERR_LIB_DSA, DSA_R_PARAMETER_ENCODING_ERROR); goto err; } if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) { ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR); goto err; } if ((dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) { ERR_raise(ERR_LIB_DSA, DSA_R_BN_DECODE_ERROR); goto err; } dsa->dirty_cnt++; ASN1_INTEGER_free(public_key); EVP_PKEY_assign_DSA(pkey, dsa); return 1; err: ASN1_INTEGER_free(public_key); DSA_free(dsa); return 0; } static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) { DSA *dsa; int ptype; unsigned char *penc = NULL; int penclen; ASN1_STRING *str = NULL; ASN1_INTEGER *pubint = NULL; ASN1_OBJECT *aobj; dsa = pkey->pkey.dsa; if (pkey->save_parameters && dsa->params.p != NULL && dsa->params.q != NULL && dsa->params.g != NULL) { str = ASN1_STRING_new(); if (str == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } str->length = i2d_DSAparams(dsa, &str->data); if (str->length <= 0) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } ptype = V_ASN1_SEQUENCE; } else ptype = V_ASN1_UNDEF; pubint = BN_to_ASN1_INTEGER(dsa->pub_key, NULL); if (pubint == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } penclen = i2d_ASN1_INTEGER(pubint, &penc); ASN1_INTEGER_free(pubint); if (penclen <= 0) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } aobj = OBJ_nid2obj(EVP_PKEY_DSA); if (aobj == NULL) goto err; if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen)) return 1; err: OPENSSL_free(penc); ASN1_STRING_free(str); return 0; } /* * In PKCS#8 DSA: you just get a private key integer and parameters in the * AlgorithmIdentifier the pubkey must be recalculated. */ static int dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) { const unsigned char *p, *pm; int pklen, pmlen; int ptype; const void *pval; const ASN1_STRING *pstr; const X509_ALGOR *palg; ASN1_INTEGER *privkey = NULL; BN_CTX *ctx = NULL; DSA *dsa = NULL; int ret = 0; if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) return 0; X509_ALGOR_get0(NULL, &ptype, &pval, palg); if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) goto decerr; if (privkey->type == V_ASN1_NEG_INTEGER || ptype != V_ASN1_SEQUENCE) goto decerr; pstr = pval; pm = pstr->data; pmlen = pstr->length; if ((dsa = d2i_DSAparams(NULL, &pm, pmlen)) == NULL) goto decerr; /* We have parameters now set private key */ if ((dsa->priv_key = BN_secure_new()) == NULL || !ASN1_INTEGER_to_BN(privkey, dsa->priv_key)) { ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR); goto dsaerr; } /* Calculate public key */ if ((dsa->pub_key = BN_new()) == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto dsaerr; } if ((ctx = BN_CTX_new()) == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto dsaerr; } BN_set_flags(dsa->priv_key, BN_FLG_CONSTTIME); if (!BN_mod_exp(dsa->pub_key, dsa->params.g, dsa->priv_key, dsa->params.p, ctx)) { ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR); goto dsaerr; } dsa->dirty_cnt++; EVP_PKEY_assign_DSA(pkey, dsa); ret = 1; goto done; decerr: ERR_raise(ERR_LIB_DSA, DSA_R_DECODE_ERROR); dsaerr: DSA_free(dsa); done: BN_CTX_free(ctx); ASN1_STRING_clear_free(privkey); return ret; } static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) { ASN1_STRING *params = NULL; ASN1_INTEGER *prkey = NULL; unsigned char *dp = NULL; int dplen; if (pkey->pkey.dsa == NULL|| pkey->pkey.dsa->priv_key == NULL) { ERR_raise(ERR_LIB_DSA, DSA_R_MISSING_PARAMETERS); goto err; } params = ASN1_STRING_new(); if (params == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data); if (params->length <= 0) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); goto err; } params->type = V_ASN1_SEQUENCE; /* Get private key into integer */ prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL); if (prkey == NULL) { ERR_raise(ERR_LIB_DSA, DSA_R_BN_ERROR); goto err; } dplen = i2d_ASN1_INTEGER(prkey, &dp); ASN1_STRING_clear_free(prkey); prkey = NULL; if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dsa), 0, V_ASN1_SEQUENCE, params, dp, dplen)) goto err; return 1; err: OPENSSL_free(dp); ASN1_STRING_free(params); ASN1_STRING_clear_free(prkey); return 0; } static int int_dsa_size(const EVP_PKEY *pkey) { return DSA_size(pkey->pkey.dsa); } static int dsa_bits(const EVP_PKEY *pkey) { return DSA_bits(pkey->pkey.dsa); } static int dsa_security_bits(const EVP_PKEY *pkey) { return DSA_security_bits(pkey->pkey.dsa); } static int dsa_missing_parameters(const EVP_PKEY *pkey) { DSA *dsa; dsa = pkey->pkey.dsa; return dsa == NULL || dsa->params.p == NULL || dsa->params.q == NULL || dsa->params.g == NULL; } static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) { if (to->pkey.dsa == NULL) { to->pkey.dsa = DSA_new(); if (to->pkey.dsa == NULL) return 0; } if (!ossl_ffc_params_copy(&to->pkey.dsa->params, &from->pkey.dsa->params)) return 0; to->pkey.dsa->dirty_cnt++; return 1; } static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) { return ossl_ffc_params_cmp(&a->pkey.dsa->params, &b->pkey.dsa->params, 1); } 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); } static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) { int ret = 0; const char *ktype = NULL; const BIGNUM *priv_key, *pub_key; int mod_len = 0; if (x->params.p != NULL) mod_len = DSA_bits(x); if (ptype == 2) priv_key = x->priv_key; else priv_key = NULL; if (ptype > 0) pub_key = x->pub_key; else pub_key = NULL; if (ptype == 2) ktype = "Private-Key"; else if (ptype == 1) ktype = "Public-Key"; else ktype = "DSA-Parameters"; if (priv_key != NULL) { if (!BIO_indent(bp, off, 128)) goto err; if (BIO_printf(bp, "%s: (%d bit)\n", ktype, mod_len) <= 0) goto err; } else { if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0) goto err; } if (!ASN1_bn_print(bp, "priv:", priv_key, NULL, off)) goto err; if (!ASN1_bn_print(bp, "pub: ", pub_key, NULL, off)) goto err; if (!ossl_ffc_params_print(bp, &x->params, off)) goto err; ret = 1; err: return ret; } static int dsa_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen) { DSA *dsa; if ((dsa = d2i_DSAparams(NULL, pder, derlen)) == NULL) return 0; dsa->dirty_cnt++; EVP_PKEY_assign_DSA(pkey, dsa); return 1; } static int dsa_param_encode(const EVP_PKEY *pkey, unsigned char **pder) { return i2d_DSAparams(pkey->pkey.dsa, pder); } static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) { return do_dsa_print(bp, pkey->pkey.dsa, indent, 0); } static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) { return do_dsa_print(bp, pkey->pkey.dsa, indent, 1); } static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) { return do_dsa_print(bp, pkey->pkey.dsa, indent, 2); } static int old_dsa_priv_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen) { DSA *dsa; if ((dsa = d2i_DSAPrivateKey(NULL, pder, derlen)) == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_DSA_LIB); return 0; } dsa->dirty_cnt++; EVP_PKEY_assign_DSA(pkey, dsa); return 1; } static int old_dsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder) { return i2d_DSAPrivateKey(pkey->pkey.dsa, pder); } static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) { DSA_SIG *dsa_sig; const unsigned char *p; if (sig == NULL) { if (BIO_puts(bp, "\n") <= 0) return 0; else return 1; } p = sig->data; dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length); if (dsa_sig != NULL) { int rv = 0; const BIGNUM *r, *s; DSA_SIG_get0(dsa_sig, &r, &s); if (BIO_write(bp, "\n", 1) != 1) goto err; if (!ASN1_bn_print(bp, "r: ", r, NULL, indent)) goto err; if (!ASN1_bn_print(bp, "s: ", s, NULL, indent)) goto err; rv = 1; err: DSA_SIG_free(dsa_sig); return rv; } if (BIO_puts(bp, "\n") <= 0) return 0; return X509_signature_dump(bp, sig, indent); } static int dsa_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; case ASN1_PKEY_CTRL_DEFAULT_MD_NID: *(int *)arg2 = NID_sha256; return 1; default: return -2; } } static size_t dsa_pkey_dirty_cnt(const EVP_PKEY *pkey) { return pkey->pkey.dsa->dirty_cnt; } static int dsa_pkey_export_to(const EVP_PKEY *from, void *to_keydata, EVP_KEYMGMT *to_keymgmt, OSSL_LIB_CTX *libctx, const char *propq) { DSA *dsa = from->pkey.dsa; OSSL_PARAM_BLD *tmpl; const BIGNUM *p = DSA_get0_p(dsa), *g = DSA_get0_g(dsa); const BIGNUM *q = DSA_get0_q(dsa), *pub_key = DSA_get0_pub_key(dsa); const BIGNUM *priv_key = DSA_get0_priv_key(dsa); OSSL_PARAM *params; int selection = 0; int rv = 0; /* * If the DSA method is foreign, then we can't be sure of anything, and * can therefore not export or pretend to export. */ if (DSA_get_method(dsa) != DSA_OpenSSL()) return 0; if (p == NULL || q == NULL || g == NULL) return 0; tmpl = OSSL_PARAM_BLD_new(); if (tmpl == NULL) return 0; if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p) || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q) || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g)) goto err; selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS; if (pub_key != NULL) { if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key)) goto err; selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY; } if (priv_key != NULL) { if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY, priv_key)) goto err; selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY; } if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) goto err; /* We export, the provider imports */ rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params); OSSL_PARAM_BLD_free_params(params); err: OSSL_PARAM_BLD_free(tmpl); return rv; } static int dsa_pkey_import_from(const OSSL_PARAM params[], void *vpctx) { EVP_PKEY_CTX *pctx = vpctx; EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx); DSA *dsa = dsa_new_with_ctx(pctx->libctx); if (dsa == NULL) { ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE); return 0; } if (!dsa_ffc_params_fromdata(dsa, params) || !dsa_key_fromdata(dsa, params) || !EVP_PKEY_assign_DSA(pkey, dsa)) { DSA_free(dsa); return 0; } return 1; } /* NB these are sorted in pkey_id order, lowest first */ const EVP_PKEY_ASN1_METHOD dsa_asn1_meths[5] = { { EVP_PKEY_DSA2, EVP_PKEY_DSA, ASN1_PKEY_ALIAS}, { EVP_PKEY_DSA1, EVP_PKEY_DSA, ASN1_PKEY_ALIAS}, { EVP_PKEY_DSA4, EVP_PKEY_DSA, ASN1_PKEY_ALIAS}, { EVP_PKEY_DSA3, EVP_PKEY_DSA, ASN1_PKEY_ALIAS}, { EVP_PKEY_DSA, EVP_PKEY_DSA, 0, "DSA", "OpenSSL DSA method", dsa_pub_decode, dsa_pub_encode, dsa_pub_cmp, dsa_pub_print, dsa_priv_decode, dsa_priv_encode, dsa_priv_print, int_dsa_size, dsa_bits, dsa_security_bits, dsa_param_decode, dsa_param_encode, dsa_missing_parameters, dsa_copy_parameters, dsa_cmp_parameters, dsa_param_print, dsa_sig_print, int_dsa_free, dsa_pkey_ctrl, old_dsa_priv_decode, old_dsa_priv_encode, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, dsa_pkey_dirty_cnt, dsa_pkey_export_to, dsa_pkey_import_from } };