Upgrade chrome's OpenSSL to same version Android ships with.

openssl/demos/cms/cms_sign2.c

+/* S/MIME signing example: 2 signers */
+#include <openssl/pem.h>
+#include <openssl/cms.h>
+#include <openssl/err.h>
+
+int main(int argc, char **argv)
+        {
+        BIO *in = NULL, *out = NULL, *tbio = NULL;
+        X509 *scert = NULL, *scert2 = NULL;
+        EVP_PKEY *skey = NULL, *skey2 = NULL;
+        CMS_ContentInfo *cms = NULL;
+        int ret = 1;
+
+        OpenSSL_add_all_algorithms();
+        ERR_load_crypto_strings();
+
+        tbio = BIO_new_file("signer.pem", "r");
+
+        if (!tbio)
+                goto err;
+
+        scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
+
+        BIO_reset(tbio);
+
+        skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
+
+        BIO_free(tbio);
+
+        tbio = BIO_new_file("signer2.pem", "r");
+
+        if (!tbio)
+                goto err;
+
+        scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
+
+        BIO_reset(tbio);
+
+        skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
+
+        if (!scert2 || !skey2)
+                goto err;
+
+        in = BIO_new_file("sign.txt", "r");
+
+        if (!in)
+                goto err;
+
+        cms = CMS_sign(NULL, NULL, NULL, in, CMS_STREAM|CMS_PARTIAL);
+
+        if (!cms)
+                goto err;
+
+        /* Add each signer in turn */
+
+        if (!CMS_add1_signer(cms, scert, skey, NULL, 0))
+                goto err;
+
+        if (!CMS_add1_signer(cms, scert2, skey2, NULL, 0))
+                goto err;
+
+        out = BIO_new_file("smout.txt", "w");
+        if (!out)
+                goto err;
+
+        /* NB: content included and finalized by SMIME_write_CMS */
+
+        if (!SMIME_write_CMS(out, cms, in, CMS_STREAM))
+                goto err;
+
+        ret = 0;
+
+        err:
+
+        if (ret)
+                {
+                fprintf(stderr, "Error Signing Data\n");
+                ERR_print_errors_fp(stderr);
+                }
+
+        if (cms)
+                CMS_ContentInfo_free(cms);
+
+        if (scert)
+                X509_free(scert);
+        if (skey)
+                EVP_PKEY_free(skey);
+
+        if (scert2)
+                X509_free(scert2);
+        if (skey)
+                EVP_PKEY_free(skey2);
+
+        if (in)
+                BIO_free(in);
+        if (out)
+                BIO_free(out);
+        if (tbio)
+                BIO_free(tbio);
+
+        return ret;
+
+        }