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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support
Security advisory:
This version has known vulnerabilities.
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c_src/boringssl/crypto/x509/a_sign.cc
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <openssl/asn1.h>
#include <openssl/digest.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/span.h>
#include <openssl/x509.h>
#include <limits.h>
#include "../internal.h"
#include "../mem_internal.h"
#include "internal.h"
int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,
const EVP_MD *type) {
if (signature->type != V_ASN1_BIT_STRING) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE);
return 0;
}
bssl::ScopedEVP_MD_CTX ctx;
if (!EVP_DigestSignInit(ctx.get(), nullptr, type, nullptr, pkey)) {
return 0;
}
return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx.get());
}
int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
void *asn, EVP_MD_CTX *ctx) {
// Historically, this function called |EVP_MD_CTX_cleanup| on return. Some
// callers rely on this to avoid memory leaks.
bssl::Cleanup cleanup = [&] { EVP_MD_CTX_cleanup(ctx); };
// Write out the requested copies of the AlgorithmIdentifier. This may modify
// |asn|, so we must do it first.
if ((algor1 != nullptr && !x509_digest_sign_algorithm(ctx, algor1)) ||
(algor2 != nullptr && !x509_digest_sign_algorithm(ctx, algor2))) {
return 0;
}
uint8_t *in = nullptr;
int in_len = ASN1_item_i2d(reinterpret_cast<ASN1_VALUE *>(asn), &in, it);
if (in_len < 0) {
return 0;
}
bssl::UniquePtr<uint8_t> free_in(in);
return x509_sign_to_bit_string(ctx, signature, bssl::Span(in, in_len));
}
int x509_sign_to_bit_string(EVP_MD_CTX *ctx, ASN1_BIT_STRING *out,
bssl::Span<const uint8_t> in) {
if (out->type != V_ASN1_BIT_STRING) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_WRONG_TYPE);
return 0;
}
EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
size_t sig_len = EVP_PKEY_size(pkey);
if (sig_len > INT_MAX) {
// Ensure the signature will fit in |out|.
OPENSSL_PUT_ERROR(X509, ERR_R_OVERFLOW);
return 0;
}
bssl::Array<uint8_t> sig;
if (!sig.Init(sig_len)) {
return 0;
}
if (!EVP_DigestSign(ctx, sig.data(), &sig_len, in.data(), in.size())) {
OPENSSL_PUT_ERROR(X509, ERR_R_EVP_LIB);
return 0;
}
sig.Shrink(sig_len);
uint8_t *sig_data;
sig.Release(&sig_data, &sig_len);
ASN1_STRING_set0(out, sig_data, static_cast<int>(sig_len));
out->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
out->flags |= ASN1_STRING_FLAG_BITS_LEFT;
return static_cast<int>(sig_len);
}