forked from pool/libgcrypt
85 lines
3.1 KiB
Diff
85 lines
3.1 KiB
Diff
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Index: libgcrypt-1.8.5/cipher/ecc.c
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===================================================================
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--- libgcrypt-1.8.5.orig/cipher/ecc.c
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+++ libgcrypt-1.8.5/cipher/ecc.c
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@@ -2060,11 +2060,11 @@ selftest_sign (gcry_sexp_t pkey, gcry_se
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{
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/* Sample data from RFC 6979 section A.2.5, hash is of message "sample" */
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static const char sample_data[] =
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- "(data (flags rfc6979)"
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+ "(data (flags rfc6979 no-blinding)"
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" (hash sha256 #af2bdbe1aa9b6ec1e2ade1d694f41fc71a831d0268e98915"
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/**/ "62113d8a62add1bf#))";
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static const char sample_data_bad[] =
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- "(data (flags rfc6979)"
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+ "(data (flags rfc6979 no-blinding)"
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" (hash sha256 #bf2bdbe1aa9b6ec1e2ade1d694f41fc71a831d0268e98915"
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/**/ "62113d8a62add1bf#))";
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static const char signature_r[] =
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Index: libgcrypt-1.8.5/cipher/ecc-ecdsa.c
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===================================================================
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--- libgcrypt-1.8.5.orig/cipher/ecc-ecdsa.c
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+++ libgcrypt-1.8.5/cipher/ecc-ecdsa.c
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@@ -52,6 +52,7 @@ _gcry_ecc_ecdsa_sign (gcry_mpi_t input,
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mpi_ec_t ctx;
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gcry_mpi_t b; /* Random number needed for blinding. */
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gcry_mpi_t bi; /* multiplicative inverse of B. */
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+ int with_blinding = !(flags & PUBKEY_FLAG_NO_BLINDING);
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if (DBG_CIPHER)
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log_mpidump ("ecdsa sign hash ", input );
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@@ -65,12 +66,15 @@ _gcry_ecc_ecdsa_sign (gcry_mpi_t input,
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b = mpi_snew (qbits);
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bi = mpi_snew (qbits);
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- do
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+ if (with_blinding)
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{
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- _gcry_mpi_randomize (b, qbits, GCRY_WEAK_RANDOM);
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- mpi_mod (b, b, skey->E.n);
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+ do
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+ {
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+ _gcry_mpi_randomize (b, qbits, GCRY_WEAK_RANDOM);
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+ mpi_mod (b, b, skey->E.n);
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+ }
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+ while (!mpi_invm (bi, b, skey->E.n));
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}
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- while (!mpi_invm (bi, b, skey->E.n));
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k = NULL;
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dr = mpi_alloc (0);
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@@ -128,15 +132,26 @@ _gcry_ecc_ecdsa_sign (gcry_mpi_t input,
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}
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while (!mpi_cmp_ui (r, 0));
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- /* Computation of dr, sum, and s are blinded with b. */
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- mpi_mulm (dr, b, skey->d, skey->E.n);
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- mpi_mulm (dr, dr, r, skey->E.n); /* dr = d*r mod n */
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- mpi_mulm (sum, b, hash, skey->E.n);
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- mpi_addm (sum, sum, dr, skey->E.n); /* sum = hash + (d*r) mod n */
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+ if (!with_blinding)
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+ {
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+ mpi_mulm (dr, skey->d, r, skey->E.n); /* dr = d*r mod n */
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+ mpi_addm (sum, hash, dr, skey->E.n); /* sum = hash + (d*r) mod n */
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+ }
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+ else
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+ {
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+ /* Computation of dr, sum, and s are blinded with b. */
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+ mpi_mulm (dr, b, skey->d, skey->E.n);
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+ mpi_mulm (dr, dr, r, skey->E.n); /* dr = d*r mod n */
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+ mpi_mulm (sum, b, hash, skey->E.n);
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+ mpi_addm (sum, sum, dr, skey->E.n); /* sum = hash + (d*r) mod n */
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+ }
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mpi_invm (k_1, k, skey->E.n); /* k_1 = k^(-1) mod n */
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mpi_mulm (s, k_1, sum, skey->E.n); /* s = k^(-1)*(hash+(d*r)) mod n */
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- /* Undo blinding by b^-1 */
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- mpi_mulm (s, bi, s, skey->E.n);
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+ if (with_blinding)
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+ {
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+ /* Undo blinding by b^-1 */
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+ mpi_mulm (s, bi, s, skey->E.n);
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+ }
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}
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while (!mpi_cmp_ui (s, 0));
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