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common: New function to uncompress an ECC public key.
* common/sexputil.c (ec2os): New. (uncompress_ecc_q_in_canon_sexp): New. * common/t-sexputil.c (fail2): new. (test_ecc_uncompress): New. (main): Run new test. -- Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
6a80d6f920
commit
935765b451
@ -690,6 +690,300 @@ get_ecc_q_from_canon_sexp (const unsigned char *keydata, size_t keydatalen,
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}
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/* Return an uncompressed point (X,Y) in P at R_BUF as a malloced
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* buffer with its byte length stored at R_BUFLEN. May not be used
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* for sensitive data. */
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static gpg_error_t
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ec2os (gcry_mpi_t x, gcry_mpi_t y, gcry_mpi_t p,
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unsigned char **r_buf, unsigned int *r_buflen)
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{
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gpg_error_t err;
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int pbytes = (mpi_get_nbits (p)+7)/8;
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size_t n;
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unsigned char *buf, *ptr;
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*r_buf = NULL;
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*r_buflen = 0;
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buf = xtrymalloc (1 + 2*pbytes);
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if (!buf)
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return gpg_error_from_syserror ();
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*buf = 04; /* Uncompressed point. */
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ptr = buf+1;
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err = gcry_mpi_print (GCRYMPI_FMT_USG, ptr, pbytes, &n, x);
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if (err)
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{
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xfree (buf);
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return err;
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}
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if (n < pbytes)
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{
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memmove (ptr+(pbytes-n), ptr, n);
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memset (ptr, 0, (pbytes-n));
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}
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ptr += pbytes;
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err = gcry_mpi_print (GCRYMPI_FMT_USG, ptr, pbytes, &n, y);
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if (err)
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{
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xfree (buf);
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return err;
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}
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if (n < pbytes)
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{
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memmove (ptr+(pbytes-n), ptr, n);
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memset (ptr, 0, (pbytes-n));
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}
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*r_buf = buf;
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*r_buflen = 1 + 2*pbytes;
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return 0;
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}
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/* Convert the ECC parameter Q in the canonical s-expression
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* (KEYDATA,KEYDATALEN) to uncompressed form. On success and if a
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* conversion was done, the new canonical encoded s-expression is
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* returned at (R_NEWKEYDAT,R_NEWKEYDATALEN); if a conversion was not
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* required (NULL,0) is stored there. On error an error code is
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* returned. The function may take any kind of key but will only do
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* the conversion for ECC curves where compression is supported. */
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gpg_error_t
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uncompress_ecc_q_in_canon_sexp (const unsigned char *keydata,
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size_t keydatalen,
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unsigned char **r_newkeydata,
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size_t *r_newkeydatalen)
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{
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gpg_error_t err;
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const unsigned char *buf, *tok;
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size_t buflen, toklen, n;
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int depth, last_depth1, last_depth2;
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const unsigned char *q_ptr; /* Points to the value of "q". */
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size_t q_ptrlen; /* Remaining length in KEYDATA. */
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size_t q_toklen; /* Q's length including prefix. */
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const unsigned char *curve_ptr; /* Points to the value of "curve". */
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size_t curve_ptrlen; /* Remaining length in KEYDATA. */
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gcry_mpi_t x, y; /* Point Q */
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gcry_mpi_t p, a, b; /* Curve parameters. */
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gcry_mpi_t x3, t, p1_4; /* Helper */
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int y_bit;
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unsigned char *qvalue; /* Q in uncompressed form. */
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unsigned int qvaluelen;
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unsigned char *dst; /* Helper */
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char lenstr[35]; /* Helper for a length prefix. */
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*r_newkeydata = NULL;
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*r_newkeydatalen = 0;
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buf = keydata;
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buflen = keydatalen;
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depth = 0;
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if (!tok)
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return gpg_error (GPG_ERR_BAD_PUBKEY);
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else if (toklen == 10 || !memcmp ("public-key", tok, toklen))
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;
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else if (toklen == 11 || !memcmp ("private-key", tok, toklen))
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;
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else if (toklen == 20 || !memcmp ("shadowed-private-key", tok, toklen))
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;
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else
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return gpg_error (GPG_ERR_BAD_PUBKEY);
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if (tok && toklen == 3 && !memcmp ("ecc", tok, toklen))
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;
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else if (tok && toklen == 5 && !memcmp ("ecdsa", tok, toklen))
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;
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else
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return 0; /* Other algo - no need for conversion. */
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last_depth1 = depth;
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q_ptr = curve_ptr = NULL;
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q_ptrlen = 0; /*(silence cc warning)*/
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while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
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&& depth && depth >= last_depth1)
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{
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if (tok)
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return gpg_error (GPG_ERR_UNKNOWN_SEXP);
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if (tok && toklen == 1 && *tok == 'q' && !q_ptr)
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{
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q_ptr = buf;
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q_ptrlen = buflen;
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}
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else if (tok && toklen == 5 && !memcmp (tok, "curve", 5) && !curve_ptr)
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{
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curve_ptr = buf;
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curve_ptrlen = buflen;
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}
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if (q_ptr && curve_ptr)
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break; /* We got all what we need. */
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/* Skip to the end of the list. */
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last_depth2 = depth;
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while (!(err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen))
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&& depth && depth >= last_depth2)
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;
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if (err)
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return err;
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}
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if (err)
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return err;
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if (!q_ptr)
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return 0; /* No Q - nothing to do. */
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/* Get Q's value and check whether uncompressing is at all required. */
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buf = q_ptr;
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buflen = q_ptrlen;
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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return err;
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if (toklen < 2 || !(*tok == 0x02 || *tok == 0x03))
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return 0; /* Invalid length or not compressed. */
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q_toklen = buf - q_ptr; /* We want the length with the prefix. */
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/* Put the x-coordinate of q into X and remember the y bit */
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y_bit = (*tok == 0x03);
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err = gcry_mpi_scan (&x, GCRYMPI_FMT_USG, tok+1, toklen-1, NULL);
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if (err)
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return err;
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/* For uncompressing we need to know the curve. */
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if (!curve_ptr)
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{
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gcry_mpi_release (x);
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return gpg_error (GPG_ERR_INV_CURVE);
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}
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buf = curve_ptr;
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buflen = curve_ptrlen;
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if ((err = parse_sexp (&buf, &buflen, &depth, &tok, &toklen)))
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{
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gcry_mpi_release (x);
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return err;
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}
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{
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char name[50];
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gcry_sexp_t curveparam;
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if (toklen + 1 > sizeof name)
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{
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gcry_mpi_release (x);
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return gpg_error (GPG_ERR_TOO_LARGE);
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}
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mem2str (name, tok, toklen+1);
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curveparam = gcry_pk_get_param (GCRY_PK_ECC, name);
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if (!curveparam)
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{
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gcry_mpi_release (x);
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return gpg_error (GPG_ERR_UNKNOWN_CURVE);
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}
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err = gcry_sexp_extract_param (curveparam, NULL, "pab", &p, &a, &b, NULL);
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gcry_sexp_release (curveparam);
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if (err)
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{
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gcry_mpi_release (x);
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return gpg_error (GPG_ERR_INTERNAL);
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}
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}
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if (!mpi_test_bit (p, 1))
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{
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/* No support for point compression for this curve. */
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gcry_mpi_release (x);
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gcry_mpi_release (p);
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gcry_mpi_release (a);
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gcry_mpi_release (b);
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return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
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}
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/*
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* Recover Y. The Weierstrass curve: y^2 = x^3 + a*x + b
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*/
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x3 = mpi_new (0);
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t = mpi_new (0);
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p1_4 = mpi_new (0);
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y = mpi_new (0);
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/* Compute right hand side. */
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mpi_powm (x3, x, GCRYMPI_CONST_THREE, p);
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mpi_mul (t, a, x);
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mpi_mod (t, t, p);
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mpi_add (t, t, b);
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mpi_mod (t, t, p);
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mpi_add (t, t, x3);
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mpi_mod (t, t, p);
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/*
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* When p mod 4 = 3, modular square root of A can be computed by
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* A^((p+1)/4) mod p
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*/
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/* Compute (p+1)/4 into p1_4 */
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mpi_rshift (p1_4, p, 2);
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mpi_add_ui (p1_4, p1_4, 1);
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mpi_powm (y, t, p1_4, p);
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if (y_bit != mpi_test_bit (y, 0))
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mpi_sub (y, p, y);
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gcry_mpi_release (p1_4);
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gcry_mpi_release (t);
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gcry_mpi_release (x3);
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gcry_mpi_release (a);
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gcry_mpi_release (b);
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err = ec2os (x, y, p, &qvalue, &qvaluelen);
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gcry_mpi_release (x);
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gcry_mpi_release (y);
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gcry_mpi_release (p);
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if (err)
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return err;
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snprintf (lenstr, sizeof lenstr, "%u:", (unsigned int)qvaluelen);
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/* Note that for simplicity we do not subtract the old length of Q
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* for the new buffer. */
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*r_newkeydata = xtrymalloc (qvaluelen + strlen(lenstr) + qvaluelen);
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if (!*r_newkeydata)
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return gpg_error_from_syserror ();
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dst = *r_newkeydata;
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n = q_ptr - keydata;
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memcpy (dst, keydata, n); /* Copy first part of original data. */
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dst += n;
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n = strlen (lenstr);
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memcpy (dst, lenstr, n); /* Copy new prefix of Q's value. */
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dst += n;
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memcpy (dst, qvalue, qvaluelen); /* Copy new value of Q. */
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dst += qvaluelen;
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log_assert (q_toklen < q_ptrlen);
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n = q_ptrlen - q_toklen;
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memcpy (dst, q_ptr + q_toklen, n);/* Copy rest of original data. */
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dst += n;
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*r_newkeydatalen = dst - *r_newkeydata;
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xfree (qvalue);
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return 0;
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}
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/* Return the algo of a public KEY of SEXP. */
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int
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get_pk_algo_from_key (gcry_sexp_t key)
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@ -28,6 +28,10 @@
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__FILE__,__LINE__, (a)); \
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exit (1); \
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} while(0)
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#define fail2(a,e) do { fprintf (stderr, "%s:%d: test %d failed: %s\n", \
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__FILE__,__LINE__, (a), gpg_strerror ((e))); \
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exit (1); \
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} while(0)
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static void
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@ -279,6 +283,206 @@ test_cmp_canon_sexp (void)
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}
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static void
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test_ecc_uncompress (void)
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{
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struct {
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const char *a; /* Uncompressed. */
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const char *b; /* Compressed. */
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}
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tests[] = {
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{
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"(public-key"
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" (ecc"
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" (curve brainpoolP256r1)"
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" (q #042ECD8679930BE2DB4AD42B8600BA3F80"
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/* */"2D4D539BFF2F69B83EC9B7BBAA7F3406"
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/* */"436DD11A1756AFE56CD93408410FCDA9"
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/* */"BA95024EB613BD481A14FCFEC27A448A#)))",
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/* The same in compressed form. */
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"(public-key"
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" (ecc"
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" (curve brainpoolP256r1)"
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" (q #022ECD8679930BE2DB4AD42B8600BA3F80"
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/* */"2D4D539BFF2F69B83EC9B7BBAA7F3406#)))"
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},
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{
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"(public-key"
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" (ecc"
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" (curve brainpoolP256r1)"
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" (q #045B784CA008EE64AB3D85017EE0D2BE87"
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/* */"558762C7300E0C8E06B1F9AF7C031458"
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/* */"9EBBA41915313417BA54218EB0569C59"
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/* */"0B156C76DBCAB6E84575E6EF68CE7B87#)))",
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/* The same in compressed form. */
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"(public-key"
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" (ecc"
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" (curve brainpoolP256r1)"
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" (q #035B784CA008EE64AB3D85017EE0D2BE87"
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/* */"558762C7300E0C8E06B1F9AF7C031458#)))"
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},
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{ /* A key which does not require a conversion. */
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"(public-key"
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" (ecdsa"
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" (p #00FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF#)"
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" (curve \"NIST P-256\")"
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" (b #5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B#)"
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" (g #046B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C2964FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5#)"
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" (n #00FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551#)"
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" (h #000000000000000000000000000000000000000000000000000000000000000001#)"
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" (q #04C8A4CEC2E9A9BC8E173531A67B0840DF345C32E261ADD780E6D83D56EFADFD5DE872F8B854819B59543CE0B7F822330464FBC4E6324DADDCD9D059554F63B344#)))"
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},
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{ /* Nothing to do for an RSA private key. */
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"(private-key"
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" (rsa"
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" (n #00B6B509596A9ECABC939212F891E656A626BA07DA8521A9CAD4C08E640C04052FBB87F424EF1A0275A48A9299AC9DB69ABE3D0124E6C756B1F7DFB9B842D6251AEA6EE85390495CADA73D671537FCE5850A932F32BAB60AB1AC1F852C1F83C625E7A7D70CDA9EF16D5C8E47739D77DF59261ABE8454807FF441E143FBD37F8545#)"
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" (e #010001#)"
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" (d #077AD3DE284245F4806A1B82B79E616FBDE821C82D691A65665E57B5FAD3F34E67F401E7BD2E28699E89D9C496CF821945AE83AC7A1231176A196BA6027E77D85789055D50404A7A2A95B1512F91F190BBAEF730ED550D227D512F89C0CDB31AC06FA9A19503DDF6B66D0B42B9691BFD6140EC1720FFC48AE00C34796DC899E5#)"
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" (p #00D586C78E5F1B4BF2E7CD7A04CA091911706F19788B93E44EE20AAF462E8363E98A72253ED845CCBF2481BB351E8557C85BCFFF0DABDBFF8E26A79A0938096F27#)"
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" (q #00DB0CDF60F26F2A296C88D6BF9F8E5BE45C0DDD713C96CC73EBCB48B061740943F21D2A93D6E42A7211E7F02A95DCED6C390A67AD21ECF739AE8A0CA46FF2EBB3#)"
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" (u #33149195F16912DB20A48D020DBC3B9E3881B39D722BF79378F6340F43148A6E9FC5F53E2853B7387BA4443BA53A52FCA8173DE6E85B42F9783D4A7817D0680B#)))"
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},
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{ /* Nothing to do dor a DSA key. */
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" (public-key"
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" (dsa"
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" (p #0084E4C626E16005770BD9509ABF7354492E85B8C0060EFAAAEC617F725B592FAA59DF5460575F41022776A9718CE62EDD542AB73C7720869EBDBC834D174ADCD7136827DF51E2613545A25CA573BC502A61B809000B6E35F5EB7FD6F18C35678C23EA1C3638FB9CFDBA2800EE1B62F41A4479DE824F2834666FBF8DC5B53C2617#)"
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" (q #00B0E6F710051002A9F425D98A677B18E0E5B038AB#)"
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" (g #44370CEE0FE8609994183DBFEBA7EEA97D466838BCF65EFF506E35616DA93FA4E572A2F08886B74977BC00CA8CD3DBEA7AEB7DB8CBB180E6975E0D2CA76E023E6DE9F8CCD8826EBA2F72B8516532F6001DEFFAE76AA5E59E0FA33DBA3999B4E92D1703098CDEDCC416CF008801964084CDE1980132B2B78CB4CE9C15A559528B#)"
|
||||
" (y #3D5DD14AFA2BF24A791E285B90232213D0E3BA74AB1109E768AED19639A322F84BB7D959E2BA92EF73DE4C7F381AA9F4053CFA3CD4527EF9043E304E5B95ED0A3A5A9D590AA641C13DB2B6E32B9B964A6A2C730DD3EA7C8E13F7A140AFF1A91CE375E9B9B960384779DC4EA180FA1F827C52288F366C0770A220F50D6D8FD6F6#)))"
|
||||
},
|
||||
{ /* Nothing to do for an ECDSA key w/o curvename. */
|
||||
"(public-key"
|
||||
" (ecdsa(flags param)"
|
||||
" (p #00FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF#)"
|
||||
" (a #00FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC#)"
|
||||
" (b #5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B#)"
|
||||
" (g #046B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C2964FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5#)"
|
||||
" (n #00FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551#)"
|
||||
" (h #000000000000000000000000000000000000000000000000000000000000000001#)"
|
||||
" (q #04C8A4CEC2E9A9BC8E173531A67B0840DF345C32E261ADD780E6D83D56EFADFD5DE872F8B854819B59543CE0B7F822330464FBC4E6324DADDCD9D059554F63B344#)))"
|
||||
},
|
||||
{ /* Nothing to do for Ed25519 key. */
|
||||
"(public-key"
|
||||
" (ecc"
|
||||
" (curve Ed25519)"
|
||||
" (q #04"
|
||||
" 1CC662926E7EFF4982B7FB8B928E61CD74CCDD85277CC57196C3AD20B611085F"
|
||||
" 47BD24842905C049257673B3F5249524E0A41FAA17B25B818D0F97E625F1A1D0#)"
|
||||
" ))"
|
||||
},
|
||||
{ /* Nothing to do for Ed25519 with EdDSA key. */
|
||||
"(public-key"
|
||||
" (ecc"
|
||||
" (curve Ed25519)(flags eddsa)"
|
||||
" (q #773E72848C1FD5F9652B29E2E7AF79571A04990E96F2016BF4E0EC1890C2B7DB#)"
|
||||
" ))"
|
||||
},
|
||||
{ /* Nothing to do for Ed25519 with EdDSA key with prefix. */
|
||||
"(public-key"
|
||||
" (ecc"
|
||||
" (curve Ed25519)(flags eddsa)"
|
||||
" (q #40"
|
||||
" 773E72848C1FD5F9652B29E2E7AF79571A04990E96F2016BF4E0EC1890C2B7DB#)"
|
||||
" ))"
|
||||
},
|
||||
{ /* Nothing to do for Ed25519 with EdDSA key with uncompress prefix. */
|
||||
"(public-key"
|
||||
" (ecc"
|
||||
" (curve Ed25519)(flags eddsa)"
|
||||
" (q #04"
|
||||
" 629ad237d1ed04dcd4abe1711dd699a1cf51b1584c4de7a4ef8b8a640180b26f"
|
||||
" 5bb7c29018ece0f46b01f2960e99041a5779afe7e2292b65f9d51f8c84723e77#)"
|
||||
" ))"
|
||||
},
|
||||
{ /* Noting to do for a Cv25519 tweaked key. */
|
||||
"(public-key"
|
||||
" (ecc"
|
||||
" (curve Curve25519)(flags djb-tweak)"
|
||||
" (q #40"
|
||||
" 918C1733127F6BF2646FAE3D081A18AE77111C903B906310B077505EFFF12740#)"
|
||||
" ))"
|
||||
},
|
||||
{ /* Nothing to do for a shadowed key. */
|
||||
"(shadowed-private-key"
|
||||
" (rsa"
|
||||
" (n #00B493C79928398DA9D99AC0E949FE6EB62F683CB974FFFBFBC01066F5C9A89B"
|
||||
" D3DC48EAD7C65F36EA943C2B2C865C26C4884FF9EDFDA8C99C855B737D77EEF6"
|
||||
" B85DBC0CCEC0E900C1F89A6893A2A93E8B31028469B6927CEB2F08687E547C68"
|
||||
" 6B0A2F7E50A194FF7AB7637E03DE0912EF7F6E5F1EC37625BD1620CCC2E7A564"
|
||||
" 31E168CDAFBD1D9E61AE47A69A6FA03EF22F844528A710B2392F262B95A3078C"
|
||||
" F321DC8325F92A5691EF69F34FD0DE0B22C79D29DC87723FCADE463829E8E5F7"
|
||||
" D196D73D6C9C180F6A6A0DDBF7B9D8F7FA293C36163B12199EF6A1A95CAE4051"
|
||||
" E3069C522CC6C4A7110F663A5DAD20F66C13A1674D050088208FAE4F33B3AB51"
|
||||
" 03#)"
|
||||
" (e #00010001#)"
|
||||
" (shadowed t1-v1"
|
||||
" (#D2760001240102000005000123350000# OPENPGP.1)"
|
||||
")))"
|
||||
},
|
||||
{
|
||||
NULL
|
||||
}};
|
||||
gpg_error_t err;
|
||||
int idx;
|
||||
gcry_sexp_t sexp;
|
||||
unsigned char *abuf, *bbuf, *rbuf;
|
||||
size_t abuflen, bbuflen, rbuflen;
|
||||
|
||||
|
||||
for (idx=0; tests[idx].a; idx++)
|
||||
{
|
||||
err = gcry_sexp_new (&sexp, tests[idx].a, 0, 1);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
err = make_canon_sexp (sexp, &abuf, &abuflen);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
gcry_sexp_release (sexp);
|
||||
|
||||
if (tests[idx].b)
|
||||
{
|
||||
err = gcry_sexp_new (&sexp, tests[idx].b, 0, 1);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
err = make_canon_sexp (sexp, &bbuf, &bbuflen);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
gcry_sexp_release (sexp);
|
||||
}
|
||||
else
|
||||
bbuf = NULL;
|
||||
|
||||
err = uncompress_ecc_q_in_canon_sexp (abuf, abuflen, &rbuf, &rbuflen);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
if (rbuf)
|
||||
fail (idx); /* Converted without a need. */
|
||||
|
||||
if (bbuf)
|
||||
{
|
||||
err = uncompress_ecc_q_in_canon_sexp (bbuf, bbuflen, &rbuf, &rbuflen);
|
||||
if (err)
|
||||
fail2 (idx,err);
|
||||
if (!rbuf)
|
||||
fail (idx); /* Not converted despite a need for it. */
|
||||
|
||||
/* log_printcanon (" orig:", abuf, abuflen); */
|
||||
/* log_printcanon (" comp:", bbuf, bbuflen); */
|
||||
/* log_printcanon ("uncomp:", rbuf, rbuflen); */
|
||||
|
||||
if (rbuflen != abuflen || memcmp (rbuf, abuf, abuflen))
|
||||
fail (idx);
|
||||
}
|
||||
|
||||
xfree (abuf);
|
||||
xfree (bbuf);
|
||||
xfree (rbuf);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
int
|
||||
main (int argc, char **argv)
|
||||
{
|
||||
@ -288,6 +492,7 @@ main (int argc, char **argv)
|
||||
test_hash_algo_from_sigval ();
|
||||
test_make_canon_sexp_from_rsa_pk ();
|
||||
test_cmp_canon_sexp ();
|
||||
test_ecc_uncompress ();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -207,6 +207,10 @@ gpg_error_t get_ecc_q_from_canon_sexp (const unsigned char *keydata,
|
||||
size_t keydatalen,
|
||||
unsigned char const **r_q,
|
||||
size_t *r_qlen);
|
||||
gpg_error_t uncompress_ecc_q_in_canon_sexp (const unsigned char *keydata,
|
||||
size_t keydatalen,
|
||||
unsigned char **r_newkeydata,
|
||||
size_t *r_newkeydatalen);
|
||||
|
||||
int get_pk_algo_from_key (gcry_sexp_t key);
|
||||
int get_pk_algo_from_canon_sexp (const unsigned char *keydata,
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user