[Rpm-maint] [rpm-software-management/rpm] Add OpenSSL crypto backend (#129)

[Panu Matilainen]

pmatilai commented on this pull request.



> +    switch (num) {
+    case 0:
+        if (!bn) {
+            bn = sig->bn = BN_new();
+        }
+        if (!bn) return 1;
+
+        /* Create a BIGNUM from the signature pointer.
+           Note: this assumes big-endian data as required
+           by the PGP multiprecision integer format
+           (RFC4880, Section 3.2)
+           This will be useful later, as we can
+           retrieve this value with appropriate
+           padding. */
+        bn = BN_bin2bn(p+2, mlen, bn);
+        if (!bn) return 1;

Oh and FWIW, padding is a relatively rare condition. On my F25 laptop there are 3366 packages installed and 19 of them are "padding case", one of them being (funny coincidence) that nss-softokn-3.28.1-1.0.fc25.x86_64. 

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