diff options
Diffstat (limited to 'plugins/CryptoPP/crypto/src/words.h')
| -rw-r--r-- | plugins/CryptoPP/crypto/src/words.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/src/words.h b/plugins/CryptoPP/crypto/src/words.h new file mode 100644 index 0000000000..f76e8499f4 --- /dev/null +++ b/plugins/CryptoPP/crypto/src/words.h @@ -0,0 +1,103 @@ +#ifndef CRYPTOPP_WORDS_H
+#define CRYPTOPP_WORDS_H
+
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+inline size_t CountWords(const word *X, size_t N)
+{
+ while (N && X[N-1]==0)
+ N--;
+ return N;
+}
+
+inline void SetWords(word *r, word a, size_t n)
+{
+ for (size_t i=0; i<n; i++)
+ r[i] = a;
+}
+
+inline void CopyWords(word *r, const word *a, size_t n)
+{
+ if (r != a)
+ memcpy(r, a, n*WORD_SIZE);
+}
+
+inline void XorWords(word *r, const word *a, const word *b, size_t n)
+{
+ for (size_t i=0; i<n; i++)
+ r[i] = a[i] ^ b[i];
+}
+
+inline void XorWords(word *r, const word *a, size_t n)
+{
+ for (size_t i=0; i<n; i++)
+ r[i] ^= a[i];
+}
+
+inline void AndWords(word *r, const word *a, const word *b, size_t n)
+{
+ for (size_t i=0; i<n; i++)
+ r[i] = a[i] & b[i];
+}
+
+inline void AndWords(word *r, const word *a, size_t n)
+{
+ for (size_t i=0; i<n; i++)
+ r[i] &= a[i];
+}
+
+inline word ShiftWordsLeftByBits(word *r, size_t n, unsigned int shiftBits)
+{
+ assert (shiftBits<WORD_BITS);
+ word u, carry=0;
+ if (shiftBits)
+ for (size_t i=0; i<n; i++)
+ {
+ u = r[i];
+ r[i] = (u << shiftBits) | carry;
+ carry = u >> (WORD_BITS-shiftBits);
+ }
+ return carry;
+}
+
+inline word ShiftWordsRightByBits(word *r, size_t n, unsigned int shiftBits)
+{
+ assert (shiftBits<WORD_BITS);
+ word u, carry=0;
+ if (shiftBits)
+ for (size_t i=n; i>0; i--)
+ {
+ u = r[i-1];
+ r[i-1] = (u >> shiftBits) | carry;
+ carry = u << (WORD_BITS-shiftBits);
+ }
+ return carry;
+}
+
+inline void ShiftWordsLeftByWords(word *r, size_t n, size_t shiftWords)
+{
+ shiftWords = STDMIN(shiftWords, n);
+ if (shiftWords)
+ {
+ for (size_t i=n-1; i>=shiftWords; i--)
+ r[i] = r[i-shiftWords];
+ SetWords(r, 0, shiftWords);
+ }
+}
+
+inline void ShiftWordsRightByWords(word *r, size_t n, size_t shiftWords)
+{
+ shiftWords = STDMIN(shiftWords, n);
+ if (shiftWords)
+ {
+ for (size_t i=0; i+shiftWords<n; i++)
+ r[i] = r[i+shiftWords];
+ SetWords(r+n-shiftWords, 0, shiftWords);
+ }
+}
+
+NAMESPACE_END
+
+#endif
|