diff options
author | irungentoo <irungentoo@gmail.com> | 2013-07-02 09:53:34 -0400 |
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committer | irungentoo <irungentoo@gmail.com> | 2013-07-02 09:53:34 -0400 |
commit | e2967396ac73cb7410787886cdaf072a184ffc49 (patch) | |
tree | 527a74d25a4a0705fc641994fd35bfab22662034 /nacl/crypto_secretbox/wrapper-open.cpp | |
parent | 8928c817df345f29aa0b194743595aa11bd6a8ba (diff) |
Added NaCl crypto library.
Diffstat (limited to 'nacl/crypto_secretbox/wrapper-open.cpp')
-rw-r--r-- | nacl/crypto_secretbox/wrapper-open.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/nacl/crypto_secretbox/wrapper-open.cpp b/nacl/crypto_secretbox/wrapper-open.cpp new file mode 100644 index 00000000..07989813 --- /dev/null +++ b/nacl/crypto_secretbox/wrapper-open.cpp | |||
@@ -0,0 +1,22 @@ | |||
1 | #include <string> | ||
2 | using std::string; | ||
3 | #include "crypto_secretbox.h" | ||
4 | |||
5 | string crypto_secretbox_open(const string &c,const string &n,const string &k) | ||
6 | { | ||
7 | if (k.size() != crypto_secretbox_KEYBYTES) throw "incorrect key length"; | ||
8 | if (n.size() != crypto_secretbox_NONCEBYTES) throw "incorrect nonce length"; | ||
9 | size_t clen = c.size() + crypto_secretbox_BOXZEROBYTES; | ||
10 | unsigned char cpad[clen]; | ||
11 | for (int i = 0;i < crypto_secretbox_BOXZEROBYTES;++i) cpad[i] = 0; | ||
12 | for (int i = crypto_secretbox_BOXZEROBYTES;i < clen;++i) cpad[i] = c[i - crypto_secretbox_BOXZEROBYTES]; | ||
13 | unsigned char mpad[clen]; | ||
14 | if (crypto_secretbox_open(mpad,cpad,clen,(const unsigned char *) n.c_str(),(const unsigned char *) k.c_str()) != 0) | ||
15 | throw "ciphertext fails verification"; | ||
16 | if (clen < crypto_secretbox_ZEROBYTES) | ||
17 | throw "ciphertext too short"; // should have been caught by _open | ||
18 | return string( | ||
19 | (char *) mpad + crypto_secretbox_ZEROBYTES, | ||
20 | clen - crypto_secretbox_ZEROBYTES | ||
21 | ); | ||
22 | } | ||