+ else if (!strncmp(gstr, "param:", 6))
+ paramfile = gstr + 6;
+ else
+ {
+ const char *p = strchr(gstr, ':');
+ int len;
+ const EVP_PKEY_ASN1_METHOD *ameth;
+
+ if (p)
+ len = p - gstr;
+ else
+ len = strlen(gstr);
+
+ ameth = EVP_PKEY_asn1_find_str(gstr, len);
+
+ if (!ameth)
+ {
+ BIO_printf(err, "Unknown algorithm %.*s\n", len, gstr);
+ return NULL;
+ }
+
+ EVP_PKEY_asn1_get0_info(NULL, &pkey_type, NULL, NULL, NULL,
+ ameth);
+ if (pkey_type == EVP_PKEY_RSA)
+ {
+ if (p)
+ {
+ keylen = atol(p + 1);
+ *pkeylen = keylen;
+ }
+ }
+ else if (p)
+ paramfile = p + 1;
+ }
+
+ if (paramfile)
+ {
+ pbio = BIO_new_file(paramfile, "r");
+ if (!pbio)
+ {
+ BIO_printf(err, "Can't open parameter file %s\n",
+ paramfile);
+ return NULL;
+ }
+ param = PEM_read_bio_Parameters(pbio, NULL);
+
+ if (!param)
+ {
+ X509 *x;
+ BIO_reset(pbio);
+ x = PEM_read_bio_X509(pbio, NULL, NULL, NULL);
+ if (x)
+ {
+ param = X509_get_pubkey(x);
+ X509_free(x);
+ }
+ }
+
+ BIO_free(pbio);
+
+ if (!param)
+ {
+ BIO_printf(err, "Error reading parameter file %s\n",
+ paramfile);
+ return NULL;
+ }
+ if (pkey_type == -1)
+ pkey_type = EVP_PKEY_id(param);
+ else if (pkey_type != EVP_PKEY_base_id(param))
+ {
+ BIO_printf(err, "Key Type does not match parameters\n");
+ EVP_PKEY_free(param);
+ return NULL;
+ }
+ }
+
+ if (palgnam)
+ {
+ const EVP_PKEY_ASN1_METHOD *ameth;
+ ameth = EVP_PKEY_asn1_find(pkey_type);
+ if (!ameth)
+ {
+ BIO_puts(err, "Internal error: can't find key algorithm\n");
+ return NULL;
+ }
+ EVP_PKEY_asn1_get0_info(NULL, NULL, NULL, NULL, palgnam,
+ ameth);
+ }
+
+ if (param)
+ {
+ gctx = EVP_PKEY_CTX_new(param, e);
+ *pkeylen = EVP_PKEY_bits(param);
+ EVP_PKEY_free(param);
+ }
+ else
+ gctx = EVP_PKEY_CTX_new_id(pkey_type, e);
+
+ if (!gctx)
+ {
+ BIO_puts(err, "Error allocating keygen context\n");
+ ERR_print_errors(err);
+ return NULL;
+ }
+
+ if (EVP_PKEY_keygen_init(gctx) <= 0)
+ {
+ BIO_puts(err, "Error initializing keygen context\n");
+ ERR_print_errors(err);
+ return NULL;
+ }
+
+ if ((pkey_type == EVP_PKEY_RSA) && (keylen != -1))
+ {
+ if (EVP_PKEY_CTX_set_rsa_keygen_bits(gctx, keylen) <= 0)
+ {
+ BIO_puts(err, "Error setting RSA keysize\n");
+ ERR_print_errors(err);
+ EVP_PKEY_CTX_free(gctx);
+ return NULL;
+ }
+ }
+
+ return gctx;