+
+void BF_cbc_encrypt(in, out, length, ks, iv, encrypt)
+unsigned char *in;
+unsigned char *out;
+long length;
+BF_KEY *ks;
+unsigned char *iv;
+int encrypt;
+ {
+ register BF_LONG tin0,tin1;
+ register BF_LONG tout0,tout1,xor0,xor1;
+ register long l=length;
+ BF_LONG tin[2];
+
+ if (encrypt)
+ {
+ n2l(iv,tout0);
+ n2l(iv,tout1);
+ iv-=8;
+ for (l-=8; l>=0; l-=8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin0^=tout0;
+ tin1^=tout1;
+ tin[0]=tin0;
+ tin[1]=tin1;
+ BF_encrypt(tin,ks);
+ tout0=tin[0];
+ tout1=tin[1];
+ l2n(tout0,out);
+ l2n(tout1,out);
+ }
+ if (l != -8)
+ {
+ n2ln(in,tin0,tin1,l+8);
+ tin0^=tout0;
+ tin1^=tout1;
+ tin[0]=tin0;
+ tin[1]=tin1;
+ BF_encrypt(tin,ks);
+ tout0=tin[0];
+ tout1=tin[1];
+ l2n(tout0,out);
+ l2n(tout1,out);
+ }
+ l2n(tout0,iv);
+ l2n(tout1,iv);
+ }
+ else
+ {
+ n2l(iv,xor0);
+ n2l(iv,xor1);
+ iv-=8;
+ for (l-=8; l>=0; l-=8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin[0]=tin0;
+ tin[1]=tin1;
+ BF_decrypt(tin,ks);
+ tout0=tin[0]^xor0;
+ tout1=tin[1]^xor1;
+ l2n(tout0,out);
+ l2n(tout1,out);
+ xor0=tin0;
+ xor1=tin1;
+ }
+ if (l != -8)
+ {
+ n2l(in,tin0);
+ n2l(in,tin1);
+ tin[0]=tin0;
+ tin[1]=tin1;
+ BF_decrypt(tin,ks);
+ tout0=tin[0]^xor0;
+ tout1=tin[1]^xor1;
+ l2nn(tout0,tout1,out,l+8);
+ xor0=tin0;
+ xor1=tin1;
+ }
+ l2n(xor0,iv);
+ l2n(xor1,iv);
+ }
+ tin0=tin1=tout0=tout1=xor0=xor1=0;
+ tin[0]=tin[1]=0;
+ }
+
+#endif