+int test_bn2dec(BIO *bp)
+{
+ static const char *bn2dec_tests[] = {
+ "0",
+ "1",
+ "-1",
+ "100",
+ "-100",
+ "123456789012345678901234567890",
+ "-123456789012345678901234567890",
+ "123456789012345678901234567890123456789012345678901234567890",
+ "-123456789012345678901234567890123456789012345678901234567890",
+ };
+ int ret = 0;
+ size_t i;
+ BIGNUM *bn = NULL;
+ char *dec = NULL;
+
+ for (i = 0; i < OSSL_NELEM(bn2dec_tests); i++) {
+ if (!BN_dec2bn(&bn, bn2dec_tests[i]))
+ goto err;
+
+ dec = BN_bn2dec(bn);
+ if (dec == NULL) {
+ fprintf(stderr, "BN_bn2dec failed on %s.\n", bn2dec_tests[i]);
+ goto err;
+ }
+
+ if (strcmp(dec, bn2dec_tests[i]) != 0) {
+ fprintf(stderr, "BN_bn2dec gave %s, wanted %s.\n", dec,
+ bn2dec_tests[i]);
+ goto err;
+ }
+
+ OPENSSL_free(dec);
+ dec = NULL;
+ }
+
+ ret = 1;
+
+err:
+ BN_free(bn);
+ OPENSSL_free(dec);
+ return ret;
+}
+