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Buffer b;	const EVP_MD *evp_md;	EVP_MD_CTX md;	char *ktype;	u_char digest[EVP_MAX_MD_SIZE], *sigblob;	u_int len, dlen, modlen;	int rlen, ret, nid;	if (key == NULL || key->type != KEY_RSA || key->rsa == NULL) {		error("ssh_rsa_verify: no RSA key");		return -1;	}	if (BN_num_bits(key->rsa->n) < SSH_RSA_MINIMUM_MODULUS_SIZE) {		error("ssh_rsa_verify: RSA modulus too small: %d < minimum %d bits",		    BN_num_bits(key->rsa->n), SSH_RSA_MINIMUM_MODULUS_SIZE);		return -1;	}	buffer_init(&b);	buffer_append(&b, signature, signaturelen);	ktype = buffer_get_string(&b, NULL);	if (strcmp("ssh-rsa", ktype) != 0) {		error("ssh_rsa_verify: cannot handle type %s", ktype);		buffer_free(&b);		xfree(ktype);		return -1;	}	xfree(ktype);	sigblob = buffer_get_string(&b, &len);	rlen = buffer_len(&b);	buffer_free(&b);	if (rlen != 0) {		error("ssh_rsa_verify: remaining bytes in signature %d", rlen);		xfree(sigblob);		return -1;	}	/* RSA_verify expects a signature of RSA_size */	modlen = RSA_size(key->rsa);	if (len > modlen) {		error("ssh_rsa_verify: len %u > modlen %u", len, modlen);		xfree(sigblob);		return -1;	} else if (len < modlen) {		u_int diff = modlen - len;		debug("ssh_rsa_verify: add padding: modlen %u > len %u",		    modlen, len);		sigblob = xrealloc(sigblob, 1, modlen);		memmove(sigblob + diff, sigblob, len);		memset(sigblob, 0, diff);		len = modlen;	}	nid = (datafellows & SSH_BUG_RSASIGMD5) ? NID_md5 : NID_sha1;	if ((evp_md = EVP_get_digestbynid(nid)) == NULL) {		error("ssh_rsa_verify: EVP_get_digestbynid %d failed", nid);		xfree(sigblob);		return -1;	}	EVP_DigestInit(&md, evp_md);	EVP_DigestUpdate(&md, data, datalen);	EVP_DigestFinal(&md, digest, &dlen);