132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* Copyright 2008-2023 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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/* Simple S/MIME verification example */
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#include <openssl/pem.h>
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#include <openssl/cms.h>
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#include <openssl/err.h>
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/*
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* print any signingTime attributes.
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* signingTime is when each party purportedly signed the message.
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*/
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static void print_signingTime(CMS_ContentInfo *cms)
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{
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STACK_OF(CMS_SignerInfo) *sis;
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CMS_SignerInfo *si;
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X509_ATTRIBUTE *attr;
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ASN1_TYPE *t;
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ASN1_UTCTIME *utctime;
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ASN1_GENERALIZEDTIME *gtime;
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BIO *b;
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int i, loc;
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b = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
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sis = CMS_get0_SignerInfos(cms);
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for (i = 0; i < sk_CMS_SignerInfo_num(sis); i++) {
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si = sk_CMS_SignerInfo_value(sis, i);
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loc = CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1);
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attr = CMS_signed_get_attr(si, loc);
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t = X509_ATTRIBUTE_get0_type(attr, 0);
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if (t == NULL)
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continue;
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switch (t->type) {
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case V_ASN1_UTCTIME:
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utctime = t->value.utctime;
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ASN1_UTCTIME_print(b, utctime);
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break;
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case V_ASN1_GENERALIZEDTIME:
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gtime = t->value.generalizedtime;
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ASN1_GENERALIZEDTIME_print(b, gtime);
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break;
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default:
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fprintf(stderr, "unrecognized signingTime type\n");
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break;
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}
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BIO_printf(b, ": signingTime from SignerInfo %i\n", i);
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}
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BIO_free(b);
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return;
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}
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int main(int argc, char **argv)
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{
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BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL;
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X509_STORE *st = NULL;
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X509 *cacert = NULL;
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CMS_ContentInfo *cms = NULL;
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int ret = EXIT_FAILURE;
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OpenSSL_add_all_algorithms();
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ERR_load_crypto_strings();
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/* Set up trusted CA certificate store */
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st = X509_STORE_new();
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if (st == NULL)
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goto err;
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/* Read in CA certificate */
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tbio = BIO_new_file("cacert.pem", "r");
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if (tbio == NULL)
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goto err;
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cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
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if (cacert == NULL)
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goto err;
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if (!X509_STORE_add_cert(st, cacert))
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goto err;
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/* Open message being verified */
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in = BIO_new_file("smout.txt", "r");
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if (in == NULL)
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goto err;
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/* parse message */
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cms = SMIME_read_CMS(in, &cont);
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if (cms == NULL)
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goto err;
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print_signingTime(cms);
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/* File to output verified content to */
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out = BIO_new_file("smver.txt", "w");
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if (out == NULL)
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goto err;
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if (!CMS_verify(cms, NULL, st, cont, out, 0)) {
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fprintf(stderr, "Verification Failure\n");
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goto err;
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}
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printf("Verification Successful\n");
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ret = EXIT_SUCCESS;
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err:
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if (ret != EXIT_SUCCESS) {
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fprintf(stderr, "Error Verifying Data\n");
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ERR_print_errors_fp(stderr);
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}
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X509_STORE_free(st);
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CMS_ContentInfo_free(cms);
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X509_free(cacert);
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BIO_free(in);
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BIO_free(out);
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BIO_free(tbio);
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return ret;
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}
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