#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