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25 lines
900 B
C++
25 lines
900 B
C++
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#include <string>
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using std::string;
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#include "crypto_box.h"
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string crypto_box(const string &m,const string &n,const string &pk,const string &sk)
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{
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if (pk.size() != crypto_box_PUBLICKEYBYTES) throw "incorrect public-key length";
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if (sk.size() != crypto_box_SECRETKEYBYTES) throw "incorrect secret-key length";
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if (n.size() != crypto_box_NONCEBYTES) throw "incorrect nonce length";
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size_t mlen = m.size() + crypto_box_ZEROBYTES;
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unsigned char mpad[mlen];
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for (int i = 0;i < crypto_box_ZEROBYTES;++i) mpad[i] = 0;
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for (int i = crypto_box_ZEROBYTES;i < mlen;++i) mpad[i] = m[i - crypto_box_ZEROBYTES];
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unsigned char cpad[mlen];
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crypto_box(cpad,mpad,mlen,
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(const unsigned char *) n.c_str(),
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(const unsigned char *) pk.c_str(),
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(const unsigned char *) sk.c_str()
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);
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return string(
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(char *) cpad + crypto_box_BOXZEROBYTES,
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mlen - crypto_box_BOXZEROBYTES
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);
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}
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