- debug("ssh_rsa_verify: signature %scorrect", (ret==0) ? "in" : "");
- return ret;
-}
-
-/*
- * See:
- * http://www.rsasecurity.com/rsalabs/pkcs/pkcs-1/
- * ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.asn
- */
-/*
- * id-sha1 OBJECT IDENTIFIER ::= { iso(1) identified-organization(3)
- * oiw(14) secsig(3) algorithms(2) 26 }
- */
-static const u_char id_sha1[] = {
- 0x30, 0x21, /* type Sequence, length 0x21 (33) */
- 0x30, 0x09, /* type Sequence, length 0x09 */
- 0x06, 0x05, /* type OID, length 0x05 */
- 0x2b, 0x0e, 0x03, 0x02, 0x1a, /* id-sha1 OID */
- 0x05, 0x00, /* NULL */
- 0x04, 0x14 /* Octet string, length 0x14 (20), followed by sha1 hash */
-};
-/*
- * id-md5 OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840)
- * rsadsi(113549) digestAlgorithm(2) 5 }
- */
-static const u_char id_md5[] = {
- 0x30, 0x20, /* type Sequence, length 0x20 (32) */
- 0x30, 0x0c, /* type Sequence, length 0x09 */
- 0x06, 0x08, /* type OID, length 0x05 */
- 0x2a, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x02, 0x05, /* id-md5 */
- 0x05, 0x00, /* NULL */
- 0x04, 0x10 /* Octet string, length 0x10 (16), followed by md5 hash */
-};
-
-static int
-openssh_RSA_verify(int type, u_char *hash, u_int hashlen,
- u_char *sigbuf, u_int siglen, RSA *rsa)
-{
- u_int ret, rsasize, oidlen = 0, hlen = 0;
- int len;
- const u_char *oid = NULL;
- u_char *decrypted = NULL;
-
- ret = 0;
- switch (type) {
- case NID_sha1:
- oid = id_sha1;
- oidlen = sizeof(id_sha1);
- hlen = 20;
- break;
- case NID_md5:
- oid = id_md5;
- oidlen = sizeof(id_md5);
- hlen = 16;
- break;
- default:
- goto done;
- break;
- }
- if (hashlen != hlen) {
- error("bad hashlen");
- goto done;
- }
- rsasize = RSA_size(rsa);
- if (siglen == 0 || siglen > rsasize) {
- error("bad siglen");
- goto done;
- }
- decrypted = xmalloc(rsasize);
- if ((len = RSA_public_decrypt(siglen, sigbuf, decrypted, rsa,
- RSA_PKCS1_PADDING)) < 0) {
- error("RSA_public_decrypt failed: %s",
- ERR_error_string(ERR_get_error(), NULL));
- goto done;
- }
- if (len != hlen + oidlen) {
- error("bad decrypted len: %d != %d + %d", len, hlen, oidlen);
- goto done;
- }
- if (memcmp(decrypted, oid, oidlen) != 0) {
- error("oid mismatch");
- goto done;
- }
- if (memcmp(decrypted + oidlen, hash, hlen) != 0) {
- error("hash mismatch");
- goto done;