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103 lines
1.9 KiB
103 lines
1.9 KiB
#ifndef CRYPTOPP_WORDS_H
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#define CRYPTOPP_WORDS_H
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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inline size_t CountWords(const word *X, size_t N)
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{
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while (N && X[N-1]==0)
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N--;
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return N;
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}
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inline void SetWords(word *r, word a, size_t n)
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{
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for (size_t i=0; i<n; i++)
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r[i] = a;
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}
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inline void CopyWords(word *r, const word *a, size_t n)
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{
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if (r != a)
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memcpy(r, a, n*WORD_SIZE);
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}
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inline void XorWords(word *r, const word *a, const word *b, size_t n)
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{
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for (size_t i=0; i<n; i++)
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r[i] = a[i] ^ b[i];
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}
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inline void XorWords(word *r, const word *a, size_t n)
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{
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for (size_t i=0; i<n; i++)
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r[i] ^= a[i];
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}
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inline void AndWords(word *r, const word *a, const word *b, size_t n)
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{
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for (size_t i=0; i<n; i++)
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r[i] = a[i] & b[i];
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}
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inline void AndWords(word *r, const word *a, size_t n)
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{
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for (size_t i=0; i<n; i++)
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r[i] &= a[i];
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}
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inline word ShiftWordsLeftByBits(word *r, size_t n, unsigned int shiftBits)
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{
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assert (shiftBits<WORD_BITS);
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word u, carry=0;
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if (shiftBits)
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for (size_t i=0; i<n; i++)
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{
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u = r[i];
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r[i] = (u << shiftBits) | carry;
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carry = u >> (WORD_BITS-shiftBits);
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}
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return carry;
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}
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inline word ShiftWordsRightByBits(word *r, size_t n, unsigned int shiftBits)
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{
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assert (shiftBits<WORD_BITS);
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word u, carry=0;
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if (shiftBits)
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for (size_t i=n; i>0; i--)
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{
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u = r[i-1];
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r[i-1] = (u >> shiftBits) | carry;
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carry = u << (WORD_BITS-shiftBits);
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}
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return carry;
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}
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inline void ShiftWordsLeftByWords(word *r, size_t n, size_t shiftWords)
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{
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shiftWords = STDMIN(shiftWords, n);
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if (shiftWords)
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{
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for (size_t i=n-1; i>=shiftWords; i--)
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r[i] = r[i-shiftWords];
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SetWords(r, 0, shiftWords);
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}
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}
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inline void ShiftWordsRightByWords(word *r, size_t n, size_t shiftWords)
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{
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shiftWords = STDMIN(shiftWords, n);
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if (shiftWords)
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{
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for (size_t i=0; i+shiftWords<n; i++)
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r[i] = r[i+shiftWords];
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SetWords(r+n-shiftWords, 0, shiftWords);
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}
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}
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NAMESPACE_END
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#endif
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