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28 lines
1.1 KiB
C++
28 lines
1.1 KiB
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_open(const string &c,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 clen = c.size() + crypto_box_BOXZEROBYTES;
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unsigned char cpad[clen];
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for (int i = 0;i < crypto_box_BOXZEROBYTES;++i) cpad[i] = 0;
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for (int i = crypto_box_BOXZEROBYTES;i < clen;++i) cpad[i] = c[i - crypto_box_BOXZEROBYTES];
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unsigned char mpad[clen];
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if (crypto_box_open(mpad,cpad,clen,
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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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) != 0)
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throw "ciphertext fails verification";
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if (clen < crypto_box_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_box_ZEROBYTES,
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clen - crypto_box_ZEROBYTES
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);
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}
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