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23 lines
974 B
C++
23 lines
974 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_open(const string &c,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 clen = c.size() + crypto_secretbox_BOXZEROBYTES;
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unsigned char cpad[clen];
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for (int i = 0;i < crypto_secretbox_BOXZEROBYTES;++i) cpad[i] = 0;
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for (int i = crypto_secretbox_BOXZEROBYTES;i < clen;++i) cpad[i] = c[i - crypto_secretbox_BOXZEROBYTES];
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unsigned char mpad[clen];
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if (crypto_secretbox_open(mpad,cpad,clen,(const unsigned char *) n.c_str(),(const unsigned char *) k.c_str()) != 0)
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throw "ciphertext fails verification";
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if (clen < crypto_secretbox_ZEROBYTES)
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throw "ciphertext too short"; // should have been caught by _open
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return string(
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(char *) mpad + crypto_secretbox_ZEROBYTES,
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clen - crypto_secretbox_ZEROBYTES
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);
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}
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