diff options
author | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
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committer | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
commit | 9f034793bcfc51c2b7c1dd14db806f7258f9a9eb (patch) | |
tree | 63bd0f50ce5b77828ad8205eafd7b9412810499e /botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp | |
parent | 619d92cfef29e653bfdf852e83888e50cfc4348f (diff) | |
parent | 65271649dbc90f3af1184ad1b23bdb64c0c07d07 (diff) |
Merge branch 'master' of git://git-nokia.trolltech.com.au/qtsoftware/research/qtuitest
Diffstat (limited to 'botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp')
-rw-r--r-- | botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp b/botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp new file mode 100644 index 0000000..c2f9c91 --- /dev/null +++ b/botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp @@ -0,0 +1,70 @@ +/* +* PKCS1 EME +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/eme_pkcs.h> + +namespace Botan { + +/* +* PKCS1 Pad Operation +*/ +SecureVector<byte> EME_PKCS1v15::pad(const byte in[], u32bit inlen, + u32bit olen, + RandomNumberGenerator& rng) const + { + olen /= 8; + + if(olen < 10) + throw Encoding_Error("PKCS1: Output space too small"); + if(inlen > olen - 10) + throw Encoding_Error("PKCS1: Input is too large"); + + SecureVector<byte> out(olen); + + out[0] = 0x02; + for(u32bit j = 1; j != olen - inlen - 1; ++j) + while(out[j] == 0) + out[j] = rng.next_byte(); + out.copy(olen - inlen, in, inlen); + + return out; + } + +/* +* PKCS1 Unpad Operation +*/ +SecureVector<byte> EME_PKCS1v15::unpad(const byte in[], u32bit inlen, + u32bit key_len) const + { + if(inlen != key_len / 8 || inlen < 10 || in[0] != 0x02) + throw Decoding_Error("PKCS1::unpad"); + + u32bit seperator = 0; + for(u32bit j = 0; j != inlen; ++j) + if(in[j] == 0) + { + seperator = j; + break; + } + if(seperator < 9) + throw Decoding_Error("PKCS1::unpad"); + + return SecureVector<byte>(in + seperator + 1, inlen - seperator - 1); + } + +/* +* Return the max input size for a given key size +*/ +u32bit EME_PKCS1v15::maximum_input_size(u32bit keybits) const + { + if(keybits / 8 > 10) + return ((keybits / 8) - 10); + else + return 0; + } + +} |