/* crypto/engine/eng_openssl.c */
-/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
- * project 2000.
+/*
+ * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
+ * 2000.
*/
/* ====================================================================
* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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
* Hudson (tjh@cryptsoft.com).
*
*/
-
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * ECDH support in OpenSSL originally developed by
+ * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
+ */
#include <stdio.h>
#include <openssl/crypto.h>
#include "cryptlib.h"
#include <openssl/engine.h>
#include <openssl/dso.h>
+#include <openssl/pem.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#ifndef OPENSSL_NO_RSA
+# include <openssl/rsa.h>
+#endif
+#ifndef OPENSSL_NO_DSA
+# include <openssl/dsa.h>
+#endif
+#ifndef OPENSSL_NO_DH
+# include <openssl/dh.h>
+#endif
+
+#include <openssl/hmac.h>
+#include <openssl/x509v3.h>
-/* This is the only function we need to implement as OpenSSL
- * doesn't have a native CRT mod_exp. Perhaps this should be
- * BN_mod_exp_crt and moved into crypto/bn/ ?? ... dunno. */
-static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
- const BIGNUM *iqmp, BN_CTX *ctx);
+/*
+ * This testing gunk is implemented (and explained) lower down. It also
+ * assumes the application explicitly calls "ENGINE_load_openssl()" because
+ * this is no longer automatic in ENGINE_load_builtin_engines().
+ */
+#define TEST_ENG_OPENSSL_RC4
+#define TEST_ENG_OPENSSL_PKEY
+/* #define TEST_ENG_OPENSSL_HMAC */
+/* #define TEST_ENG_OPENSSL_HMAC_INIT */
+/* #define TEST_ENG_OPENSSL_RC4_OTHERS */
+#define TEST_ENG_OPENSSL_RC4_P_INIT
+/* #define TEST_ENG_OPENSSL_RC4_P_CIPHER */
+#define TEST_ENG_OPENSSL_SHA
+/* #define TEST_ENG_OPENSSL_SHA_OTHERS */
+/* #define TEST_ENG_OPENSSL_SHA_P_INIT */
+/* #define TEST_ENG_OPENSSL_SHA_P_UPDATE */
+/* #define TEST_ENG_OPENSSL_SHA_P_FINAL */
+
+/* Now check what of those algorithms are actually enabled */
+#ifdef OPENSSL_NO_RC4
+# undef TEST_ENG_OPENSSL_RC4
+# undef TEST_ENG_OPENSSL_RC4_OTHERS
+# undef TEST_ENG_OPENSSL_RC4_P_INIT
+# undef TEST_ENG_OPENSSL_RC4_P_CIPHER
+#endif
+
+#ifdef TEST_ENG_OPENSSL_RC4
+static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+ const int **nids, int nid);
+#endif
+#ifdef TEST_ENG_OPENSSL_SHA
+static int openssl_digests(ENGINE *e, const EVP_MD **digest,
+ const int **nids, int nid);
+#endif
+
+#ifdef TEST_ENG_OPENSSL_PKEY
+static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
+ UI_METHOD *ui_method,
+ void *callback_data);
+#endif
+
+#ifdef TEST_ENG_OPENSSL_HMAC
+static int ossl_register_hmac_meth(void);
+static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
+ const int **nids, int nid);
+#endif
/* The constants used when creating the ENGINE */
static const char *engine_openssl_id = "openssl";
-static const char *engine_openssl_name = "Software default engine support";
-
-/* As this is only ever called once, there's no need for locking
- * (indeed - the lock will already be held by our caller!!!) */
-ENGINE *ENGINE_openssl(void)
- {
- ENGINE *ret = ENGINE_new();
- if(!ret)
- return NULL;
- if(!ENGINE_set_id(ret, engine_openssl_id) ||
- !ENGINE_set_name(ret, engine_openssl_name) ||
-#ifndef OPENSSL_NO_RSA
- !ENGINE_set_RSA(ret, RSA_get_default_openssl_method()) ||
+static const char *engine_openssl_name = "Software engine support";
+
+/*
+ * This internal function is used by ENGINE_openssl() and possibly by the
+ * "dynamic" ENGINE support too
+ */
+static int bind_helper(ENGINE *e)
+{
+ if (!ENGINE_set_id(e, engine_openssl_id)
+ || !ENGINE_set_name(e, engine_openssl_name)
+#ifndef TEST_ENG_OPENSSL_NO_ALGORITHMS
+# ifndef OPENSSL_NO_RSA
+ || !ENGINE_set_RSA(e, RSA_get_default_method())
+# endif
+# ifndef OPENSSL_NO_DSA
+ || !ENGINE_set_DSA(e, DSA_get_default_method())
+# endif
+# ifndef OPENSSL_NO_EC
+ || !ENGINE_set_ECDH(e, ECDH_OpenSSL())
+ || !ENGINE_set_ECDSA(e, ECDSA_OpenSSL())
+# endif
+# ifndef OPENSSL_NO_DH
+ || !ENGINE_set_DH(e, DH_get_default_method())
+# endif
+ || !ENGINE_set_RAND(e, RAND_SSLeay())
+# ifdef TEST_ENG_OPENSSL_RC4
+ || !ENGINE_set_ciphers(e, openssl_ciphers)
+# endif
+# ifdef TEST_ENG_OPENSSL_SHA
+ || !ENGINE_set_digests(e, openssl_digests)
+# endif
#endif
-#ifndef OPENSSL_NO_DSA
- !ENGINE_set_DSA(ret, DSA_get_default_openssl_method()) ||
+#ifdef TEST_ENG_OPENSSL_PKEY
+ || !ENGINE_set_load_privkey_function(e, openssl_load_privkey)
#endif
-#ifndef OPENSSL_NO_DH
- !ENGINE_set_DH(ret, DH_get_default_openssl_method()) ||
+#ifdef TEST_ENG_OPENSSL_HMAC
+ || !ossl_register_hmac_meth()
+ || !ENGINE_set_pkey_meths(e, ossl_pkey_meths)
+#endif
+ )
+ return 0;
+ /*
+ * If we add errors to this ENGINE, ensure the error handling is setup
+ * here
+ */
+ /* openssl_load_error_strings(); */
+ return 1;
+}
+
+static ENGINE *engine_openssl(void)
+{
+ ENGINE *ret = ENGINE_new();
+ if (!ret)
+ return NULL;
+ if (!bind_helper(ret)) {
+ ENGINE_free(ret);
+ return NULL;
+ }
+ return ret;
+}
+
+void ENGINE_load_openssl(void)
+{
+ ENGINE *toadd = engine_openssl();
+ if (!toadd)
+ return;
+ ENGINE_add(toadd);
+ /*
+ * If the "add" worked, it gets a structural reference. So either way, we
+ * release our just-created reference.
+ */
+ ENGINE_free(toadd);
+ ERR_clear_error();
+}
+
+/*
+ * This stuff is needed if this ENGINE is being compiled into a
+ * self-contained shared-library.
+ */
+#ifdef ENGINE_DYNAMIC_SUPPORT
+static int bind_fn(ENGINE *e, const char *id)
+{
+ if (id && (strcmp(id, engine_openssl_id) != 0))
+ return 0;
+ if (!bind_helper(e))
+ return 0;
+ return 1;
+}
+
+IMPLEMENT_DYNAMIC_CHECK_FN()
+ IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
+#endif /* ENGINE_DYNAMIC_SUPPORT */
+#ifdef TEST_ENG_OPENSSL_RC4
+/*-
+ * This section of code compiles an "alternative implementation" of two modes of
+ * RC4 into this ENGINE. The result is that EVP_CIPHER operation for "rc4"
+ * should under normal circumstances go via this support rather than the default
+ * EVP support. There are other symbols to tweak the testing;
+ * TEST_ENC_OPENSSL_RC4_OTHERS - print a one line message to stderr each time
+ * we're asked for a cipher we don't support (should not happen).
+ * TEST_ENG_OPENSSL_RC4_P_INIT - print a one line message to stderr each time
+ * the "init_key" handler is called.
+ * TEST_ENG_OPENSSL_RC4_P_CIPHER - ditto for the "cipher" handler.
+ */
+# include <openssl/rc4.h>
+# define TEST_RC4_KEY_SIZE 16
+static const int test_cipher_nids[] = { NID_rc4, NID_rc4_40 };
+
+static const int test_cipher_nids_number = 2;
+typedef struct {
+ unsigned char key[TEST_RC4_KEY_SIZE];
+ RC4_KEY ks;
+} TEST_RC4_KEY;
+# define test(ctx) ((TEST_RC4_KEY *)(ctx)->cipher_data)
+static int test_rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+# ifdef TEST_ENG_OPENSSL_RC4_P_INIT
+ fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_init_key() called\n");
+# endif
+ memcpy(&test(ctx)->key[0], key, EVP_CIPHER_CTX_key_length(ctx));
+ RC4_set_key(&test(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
+ test(ctx)->key);
+ return 1;
+}
+
+static int test_rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
+ const unsigned char *in, size_t inl)
+{
+# ifdef TEST_ENG_OPENSSL_RC4_P_CIPHER
+ fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_cipher() called\n");
+# endif
+ RC4(&test(ctx)->ks, inl, in, out);
+ return 1;
+}
+
+static const EVP_CIPHER test_r4_cipher = {
+ NID_rc4,
+ 1, TEST_RC4_KEY_SIZE, 0,
+ EVP_CIPH_VARIABLE_LENGTH,
+ test_rc4_init_key,
+ test_rc4_cipher,
+ NULL,
+ sizeof(TEST_RC4_KEY),
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
+static const EVP_CIPHER test_r4_40_cipher = {
+ NID_rc4_40,
+ 1, 5 /* 40 bit */ , 0,
+ EVP_CIPH_VARIABLE_LENGTH,
+ test_rc4_init_key,
+ test_rc4_cipher,
+ NULL,
+ sizeof(TEST_RC4_KEY),
+ NULL,
+ NULL,
+ NULL,
+ NULL
+};
+
+static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
+ const int **nids, int nid)
+{
+ if (!cipher) {
+ /* We are returning a list of supported nids */
+ *nids = test_cipher_nids;
+ return test_cipher_nids_number;
+ }
+ /* We are being asked for a specific cipher */
+ if (nid == NID_rc4)
+ *cipher = &test_r4_cipher;
+ else if (nid == NID_rc4_40)
+ *cipher = &test_r4_40_cipher;
+ else {
+# ifdef TEST_ENG_OPENSSL_RC4_OTHERS
+ fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) returning NULL for "
+ "nid %d\n", nid);
+# endif
+ *cipher = NULL;
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+#ifdef TEST_ENG_OPENSSL_SHA
+/* Much the same sort of comment as for TEST_ENG_OPENSSL_RC4 */
+# include <openssl/sha.h>
+static const int test_digest_nids[] = { NID_sha1 };
+
+static const int test_digest_nids_number = 1;
+static int test_sha1_init(EVP_MD_CTX *ctx)
+{
+# ifdef TEST_ENG_OPENSSL_SHA_P_INIT
+ fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_init() called\n");
+# endif
+ return SHA1_Init(ctx->md_data);
+}
+
+static int test_sha1_update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+# ifdef TEST_ENG_OPENSSL_SHA_P_UPDATE
+ fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_update() called\n");
+# endif
+ return SHA1_Update(ctx->md_data, data, count);
+}
+
+static int test_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
+{
+# ifdef TEST_ENG_OPENSSL_SHA_P_FINAL
+ fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_final() called\n");
+# endif
+ return SHA1_Final(md, ctx->md_data);
+}
+
+static const EVP_MD test_sha_md = {
+ NID_sha1,
+ NID_sha1WithRSAEncryption,
+ SHA_DIGEST_LENGTH,
+ 0,
+ test_sha1_init,
+ test_sha1_update,
+ test_sha1_final,
+ NULL,
+ NULL,
+ EVP_PKEY_RSA_method,
+ SHA_CBLOCK,
+ sizeof(EVP_MD *) + sizeof(SHA_CTX),
+};
+
+static int openssl_digests(ENGINE *e, const EVP_MD **digest,
+ const int **nids, int nid)
+{
+ if (!digest) {
+ /* We are returning a list of supported nids */
+ *nids = test_digest_nids;
+ return test_digest_nids_number;
+ }
+ /* We are being asked for a specific digest */
+ if (nid == NID_sha1)
+ *digest = &test_sha_md;
+ else {
+# ifdef TEST_ENG_OPENSSL_SHA_OTHERS
+ fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) returning NULL for "
+ "nid %d\n", nid);
+# endif
+ *digest = NULL;
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+#ifdef TEST_ENG_OPENSSL_PKEY
+static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
+ UI_METHOD *ui_method,
+ void *callback_data)
+{
+ BIO *in;
+ EVP_PKEY *key;
+ fprintf(stderr, "(TEST_ENG_OPENSSL_PKEY)Loading Private key %s\n",
+ key_id);
+ in = BIO_new_file(key_id, "r");
+ if (!in)
+ return NULL;
+ key = PEM_read_bio_PrivateKey(in, NULL, 0, NULL);
+ BIO_free(in);
+ return key;
+}
+#endif
+
+#ifdef TEST_ENG_OPENSSL_HMAC
+
+/*
+ * Experimental HMAC redirection implementation: mainly copied from
+ * hm_pmeth.c
+ */
+
+/* HMAC pkey context structure */
+
+typedef struct {
+ const EVP_MD *md; /* MD for HMAC use */
+ ASN1_OCTET_STRING ktmp; /* Temp storage for key */
+ HMAC_CTX ctx;
+} OSSL_HMAC_PKEY_CTX;
+
+static int ossl_hmac_init(EVP_PKEY_CTX *ctx)
+{
+ OSSL_HMAC_PKEY_CTX *hctx;
+ hctx = OPENSSL_malloc(sizeof(*hctx));
+ if (!hctx)
+ return 0;
+ hctx->md = NULL;
+ hctx->ktmp.data = NULL;
+ hctx->ktmp.length = 0;
+ hctx->ktmp.flags = 0;
+ hctx->ktmp.type = V_ASN1_OCTET_STRING;
+ HMAC_CTX_init(&hctx->ctx);
+ EVP_PKEY_CTX_set_data(ctx, hctx);
+ EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
+# ifdef TEST_ENG_OPENSSL_HMAC_INIT
+ fprintf(stderr, "(TEST_ENG_OPENSSL_HMAC) ossl_hmac_init() called\n");
+# endif
+ return 1;
+}
+
+static int ossl_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+{
+ OSSL_HMAC_PKEY_CTX *sctx, *dctx;
+ if (!ossl_hmac_init(dst))
+ return 0;
+ sctx = EVP_PKEY_CTX_get_data(src);
+ dctx = EVP_PKEY_CTX_get_data(dst);
+ dctx->md = sctx->md;
+ HMAC_CTX_init(&dctx->ctx);
+ if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
+ return 0;
+ if (sctx->ktmp.data) {
+ if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
+ sctx->ktmp.data, sctx->ktmp.length))
+ return 0;
+ }
+ return 1;
+}
+
+static void ossl_hmac_cleanup(EVP_PKEY_CTX *ctx)
+{
+ OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
+
+ HMAC_CTX_cleanup(&hctx->ctx);
+ OPENSSL_clear_free(hctx->ktmp.data, hctx->ktmp.length);
+ OPENSSL_free(hctx);
+}
+
+static int ossl_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
+{
+ ASN1_OCTET_STRING *hkey = NULL;
+ OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
+ if (!hctx->ktmp.data)
+ return 0;
+ hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
+ if (!hkey)
+ return 0;
+ EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
+
+ return 1;
+}
+
+static int ossl_int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
+{
+ OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx->pctx);
+ if (!HMAC_Update(&hctx->ctx, data, count))
+ return 0;
+ return 1;
+}
+
+static int ossl_hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
+{
+ EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
+ mctx->update = ossl_int_update;
+ return 1;
+}
+
+static int ossl_hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig,
+ size_t *siglen, EVP_MD_CTX *mctx)
+{
+ unsigned int hlen;
+ OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
+ int l = EVP_MD_CTX_size(mctx);
+
+ if (l < 0)
+ return 0;
+ *siglen = l;
+ if (!sig)
+ return 1;
+
+ if (!HMAC_Final(&hctx->ctx, sig, &hlen))
+ return 0;
+ *siglen = (size_t)hlen;
+ return 1;
+}
+
+static int ossl_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
+{
+ OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
+ EVP_PKEY *pk;
+ ASN1_OCTET_STRING *key;
+ switch (type) {
+
+ case EVP_PKEY_CTRL_SET_MAC_KEY:
+ if ((!p2 && p1 > 0) || (p1 < -1))
+ return 0;
+ if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
+ return 0;
+ break;
+
+ case EVP_PKEY_CTRL_MD:
+ hctx->md = p2;
+ break;
+
+ case EVP_PKEY_CTRL_DIGESTINIT:
+ pk = EVP_PKEY_CTX_get0_pkey(ctx);
+ key = EVP_PKEY_get0(pk);
+ if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, NULL))
+ return 0;
+ break;
+
+ default:
+ return -2;
+
+ }
+ return 1;
+}
+
+static int ossl_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
+ const char *type, const char *value)
+{
+ if (!value) {
+ return 0;
+ }
+ if (strcmp(type, "key") == 0) {
+ void *p = (void *)value;
+ return ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
+ }
+ if (strcmp(type, "hexkey") == 0) {
+ unsigned char *key;
+ int r;
+ long keylen;
+ key = string_to_hex(value, &keylen);
+ if (!key)
+ return 0;
+ r = ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
+ OPENSSL_free(key);
+ return r;
+ }
+ return -2;
+}
+
+static EVP_PKEY_METHOD *ossl_hmac_meth;
+
+static int ossl_register_hmac_meth(void)
+{
+ EVP_PKEY_METHOD *meth;
+ meth = EVP_PKEY_meth_new(EVP_PKEY_HMAC, 0);
+ if (!meth)
+ return 0;
+ EVP_PKEY_meth_set_init(meth, ossl_hmac_init);
+ EVP_PKEY_meth_set_copy(meth, ossl_hmac_copy);
+ EVP_PKEY_meth_set_cleanup(meth, ossl_hmac_cleanup);
+
+ EVP_PKEY_meth_set_keygen(meth, 0, ossl_hmac_keygen);
+
+ EVP_PKEY_meth_set_signctx(meth, ossl_hmac_signctx_init,
+ ossl_hmac_signctx);
+
+ EVP_PKEY_meth_set_ctrl(meth, ossl_hmac_ctrl, ossl_hmac_ctrl_str);
+ ossl_hmac_meth = meth;
+ return 1;
+}
+
+static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
+ const int **nids, int nid)
+{
+ static int ossl_pkey_nids[] = {
+ EVP_PKEY_HMAC,
+ 0
+ };
+ if (!pmeth) {
+ *nids = ossl_pkey_nids;
+ return 1;
+ }
+
+ if (nid == EVP_PKEY_HMAC) {
+ *pmeth = ossl_hmac_meth;
+ return 1;
+ }
+
+ *pmeth = NULL;
+ return 0;
+}
+
#endif
- !ENGINE_set_RAND(ret, RAND_SSLeay()) ||
- !ENGINE_set_BN_mod_exp(ret, BN_mod_exp) ||
- !ENGINE_set_BN_mod_exp_crt(ret, openssl_mod_exp_crt))
- {
- ENGINE_free(ret);
- return NULL;
- }
- return ret;
- }
-
-/* Chinese Remainder Theorem, taken and adapted from rsa_eay.c */
-static int openssl_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
- const BIGNUM *q, const BIGNUM *dmp1,
- const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
- {
- BIGNUM r1,m1;
- int ret=0;
- BN_CTX *bn_ctx;
- BIGNUM *temp_bn = NULL;
-
- if (ctx)
- bn_ctx = ctx;
- else
- if ((bn_ctx=BN_CTX_new()) == NULL) goto err;
- BN_init(&m1);
- BN_init(&r1);
- /* BN_mul() cannot accept const BIGNUMs so I use the BN_CTX
- * to duplicate what I need. <sigh> */
- BN_CTX_start(bn_ctx);
- if ((temp_bn = BN_CTX_get(bn_ctx)) == NULL) goto err;
- if (!BN_copy(temp_bn, iqmp)) goto err;
-
- if (!BN_mod(&r1, a, q, bn_ctx)) goto err;
- if (!BN_mod_exp(&m1, &r1, dmq1, q, bn_ctx))
- goto err;
-
- if (!BN_mod(&r1, a, p, bn_ctx)) goto err;
- if (!BN_mod_exp(r, &r1, dmp1, p, bn_ctx))
- goto err;
-
- if (!BN_sub(r, r, &m1)) goto err;
- /* This will help stop the size of r0 increasing, which does
- * affect the multiply if it optimised for a power of 2 size */
- if (r->neg)
- if (!BN_add(r, r, p)) goto err;
-
- if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
- if (!BN_mod(r, &r1, p, bn_ctx)) goto err;
- /* If p < q it is occasionally possible for the correction of
- * adding 'p' if r is negative above to leave the result still
- * negative. This can break the private key operations: the following
- * second correction should *always* correct this rare occurrence.
- * This will *never* happen with OpenSSL generated keys because
- * they ensure p > q [steve]
- */
- if (r->neg)
- if (!BN_add(r, r, p)) goto err;
- /* Again, BN_mul() will need non-const values. */
- if (!BN_copy(temp_bn, q)) goto err;
- if (!BN_mul(&r1, r, temp_bn, bn_ctx)) goto err;
- if (!BN_add(r, &r1, &m1)) goto err;
-
- ret=1;
-err:
- BN_clear_free(&m1);
- BN_clear_free(&r1);
- BN_CTX_end(ctx);
- if (!ctx)
- BN_CTX_free(bn_ctx);
- return(ret);
- }
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