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241 lines
7.1 KiB
C
241 lines
7.1 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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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#include <stdio.h>
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#include <time.h>
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#include <sys/types.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/objects.h>
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#include <openssl/buffer.h>
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#include "internal/asn1_int.h"
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#include "internal/evp_int.h"
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#ifndef NO_ASN1_OLD
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int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
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ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
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const EVP_MD *type)
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{
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EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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unsigned char *p, *buf_in = NULL, *buf_out = NULL;
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int i, inl = 0, outl = 0;
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size_t inll = 0, outll = 0;
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X509_ALGOR *a;
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if (ctx == NULL) {
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ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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for (i = 0; i < 2; i++) {
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if (i == 0)
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a = algor1;
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else
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a = algor2;
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if (a == NULL)
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continue;
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if (type->pkey_type == NID_dsaWithSHA1) {
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/*
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* special case: RFC 2459 tells us to omit 'parameters' with
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* id-dsa-with-sha1
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*/
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ASN1_TYPE_free(a->parameter);
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a->parameter = NULL;
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} else if ((a->parameter == NULL) ||
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(a->parameter->type != V_ASN1_NULL)) {
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ASN1_TYPE_free(a->parameter);
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if ((a->parameter = ASN1_TYPE_new()) == NULL)
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goto err;
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a->parameter->type = V_ASN1_NULL;
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}
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ASN1_OBJECT_free(a->algorithm);
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a->algorithm = OBJ_nid2obj(type->pkey_type);
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if (a->algorithm == NULL) {
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ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
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goto err;
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}
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if (a->algorithm->length == 0) {
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ASN1err(ASN1_F_ASN1_SIGN,
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ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
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goto err;
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}
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}
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inl = i2d(data, NULL);
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if (inl <= 0) {
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ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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inll = (size_t)inl;
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buf_in = OPENSSL_malloc(inll);
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outll = outl = EVP_PKEY_size(pkey);
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buf_out = OPENSSL_malloc(outll);
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if (buf_in == NULL || buf_out == NULL) {
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outl = 0;
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ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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p = buf_in;
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i2d(data, &p);
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if (!EVP_SignInit_ex(ctx, type, NULL)
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|| !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
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|| !EVP_SignFinal(ctx, (unsigned char *)buf_out,
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(unsigned int *)&outl, pkey)) {
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outl = 0;
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ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
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goto err;
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}
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OPENSSL_free(signature->data);
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signature->data = buf_out;
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buf_out = NULL;
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signature->length = outl;
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/*
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* In the interests of compatibility, I'll make sure that the bit string
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* has a 'not-used bits' value of 0
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*/
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signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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err:
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EVP_MD_CTX_free(ctx);
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OPENSSL_clear_free((char *)buf_in, inll);
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OPENSSL_clear_free((char *)buf_out, outll);
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return outl;
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}
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#endif
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int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
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X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
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EVP_PKEY *pkey, const EVP_MD *type)
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{
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int rv;
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EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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if (ctx == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
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EVP_MD_CTX_free(ctx);
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return 0;
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}
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rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
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EVP_MD_CTX_free(ctx);
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return rv;
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}
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int ASN1_item_sign_ctx(const ASN1_ITEM *it,
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X509_ALGOR *algor1, X509_ALGOR *algor2,
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ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
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{
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const EVP_MD *type;
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EVP_PKEY *pkey;
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unsigned char *buf_in = NULL, *buf_out = NULL;
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size_t inl = 0, outl = 0, outll = 0;
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int signid, paramtype, buf_len = 0;
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int rv;
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type = EVP_MD_CTX_md(ctx);
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pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
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if (pkey == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
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goto err;
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}
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if (pkey->ameth == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
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goto err;
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}
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if (pkey->ameth->item_sign) {
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rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
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if (rv == 1)
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outl = signature->length;
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/*-
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* Return value meanings:
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* <=0: error.
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* 1: method does everything.
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* 2: carry on as normal.
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* 3: ASN1 method sets algorithm identifiers: just sign.
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*/
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if (rv <= 0)
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
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if (rv <= 1)
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goto err;
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} else {
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rv = 2;
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}
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if (rv == 2) {
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if (type == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
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goto err;
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}
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if (!OBJ_find_sigid_by_algs(&signid,
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EVP_MD_nid(type),
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pkey->ameth->pkey_id)) {
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
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ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
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goto err;
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}
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if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
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paramtype = V_ASN1_NULL;
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else
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paramtype = V_ASN1_UNDEF;
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if (algor1)
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X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
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if (algor2)
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X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
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}
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buf_len = ASN1_item_i2d(asn, &buf_in, it);
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if (buf_len <= 0) {
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outl = 0;
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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inl = buf_len;
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outll = outl = EVP_PKEY_size(pkey);
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buf_out = OPENSSL_malloc(outll);
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if (buf_in == NULL || buf_out == NULL) {
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outl = 0;
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
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outl = 0;
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ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
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goto err;
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}
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OPENSSL_free(signature->data);
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signature->data = buf_out;
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buf_out = NULL;
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signature->length = outl;
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/*
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* In the interests of compatibility, I'll make sure that the bit string
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* has a 'not-used bits' value of 0
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*/
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signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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err:
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OPENSSL_clear_free((char *)buf_in, inl);
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OPENSSL_clear_free((char *)buf_out, outll);
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return outl;
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}
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