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File gcryptdsa2.diff of Package rpm
--- ./rpmio/digest_libgcrypt.c.orig +++ ./rpmio/digest_libgcrypt.c @@ -302,10 +302,16 @@ static int pgpVerifySigDSA(pgpDigAlg pgpkey, pgpDigAlg pgpsig, uint8_t *hash, si struct pgpDigSigDSA_s *sig = pgpsig->data; gcry_sexp_t sexp_sig = NULL, sexp_data = NULL, sexp_pkey = NULL; int rc = 1; + size_t qlen; if (!sig || !key) return rc; + qlen = (mpi_get_nbits(key->q) + 7) / 8; + if (qlen < 20) + qlen = 20; /* sanity */ + if (hashlen > qlen) + hashlen = qlen; /* dsa2: truncate hash to qlen */ gcry_sexp_build(&sexp_sig, NULL, "(sig-val (dsa (r %M) (s %M)))", sig->r, sig->s); gcry_sexp_build(&sexp_data, NULL, "(data (flags raw) (value %b))", (int)hashlen, (const char *)hash); gcry_sexp_build(&sexp_pkey, NULL, "(public-key (dsa (p %M) (q %M) (g %M) (y %M)))", key->p, key->q, key->g, key->y);
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