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20 lines
795 B
C++
20 lines
795 B
C++
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#include <string>
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using std::string;
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#include "crypto_secretbox.h"
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string crypto_secretbox(const string &m,const string &n,const string &k)
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{
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if (k.size() != crypto_secretbox_KEYBYTES) throw "incorrect key length";
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if (n.size() != crypto_secretbox_NONCEBYTES) throw "incorrect nonce length";
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size_t mlen = m.size() + crypto_secretbox_ZEROBYTES;
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unsigned char mpad[mlen];
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for (int i = 0;i < crypto_secretbox_ZEROBYTES;++i) mpad[i] = 0;
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for (int i = crypto_secretbox_ZEROBYTES;i < mlen;++i) mpad[i] = m[i - crypto_secretbox_ZEROBYTES];
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unsigned char cpad[mlen];
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crypto_secretbox(cpad,mpad,mlen,(const unsigned char *) n.c_str(),(const unsigned char *) k.c_str());
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return string(
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(char *) cpad + crypto_secretbox_BOXZEROBYTES,
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mlen - crypto_secretbox_BOXZEROBYTES
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);
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}
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