* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
#include "rc5_locl.h"
void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
#include "rc5_locl.h"
void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data,
- int rounds)
- {
- RC5_32_INT L[64],l,ll,A,B,*S,k;
- int i,j,m,c,t,ii,jj;
-
- if ( (rounds != RC5_16_ROUNDS) &&
- (rounds != RC5_12_ROUNDS) &&
- (rounds != RC5_8_ROUNDS))
- rounds=RC5_16_ROUNDS;
+ int rounds)
+{
+ RC5_32_INT L[64], l, ll, A, B, *S, k;
+ int i, j, m, c, t, ii, jj;
- j=(t>c)?t:c;
- j*=3;
- ii=jj=0;
- A=B=0;
- for (i=0; i<j; i++)
- {
- k=(S[ii]+A+B)&RC5_32_MASK;
- A=S[ii]=ROTATE_l32(k,3);
- m=(int)(A+B);
- k=(L[jj]+A+B)&RC5_32_MASK;
- B=L[jj]=ROTATE_l32(k,m);
- if (++ii >= t) ii=0;
- if (++jj >= c) jj=0;
- }
- }
+ c = (len + 3) / 4;
+ t = (rounds + 1) * 2;
+ S[0] = RC5_32_P;
+ for (i = 1; i < t; i++)
+ S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
+ j = (t > c) ? t : c;
+ j *= 3;
+ ii = jj = 0;
+ A = B = 0;
+ for (i = 0; i < j; i++) {
+ k = (S[ii] + A + B) & RC5_32_MASK;
+ A = S[ii] = ROTATE_l32(k, 3);
+ m = (int)(A + B);
+ k = (L[jj] + A + B) & RC5_32_MASK;
+ B = L[jj] = ROTATE_l32(k, m);
+ if (++ii >= t)
+ ii = 0;
+ if (++jj >= c)
+ jj = 0;
+ }
+}