diff options
Diffstat (limited to 'botan/src/pk_pad/eme_pkcs')
-rw-r--r-- | botan/src/pk_pad/eme_pkcs/eme_pkcs.cpp | 70 | ||||
-rw-r--r-- | botan/src/pk_pad/eme_pkcs/eme_pkcs.h | 30 | ||||
-rw-r--r-- | botan/src/pk_pad/eme_pkcs/info.txt | 10 |
3 files changed, 110 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; + } + +} diff --git a/botan/src/pk_pad/eme_pkcs/eme_pkcs.h b/botan/src/pk_pad/eme_pkcs/eme_pkcs.h new file mode 100644 index 0000000..1aeedf5 --- /dev/null +++ b/botan/src/pk_pad/eme_pkcs/eme_pkcs.h @@ -0,0 +1,30 @@ +/* +* EME PKCS#1 v1.5 +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_EME_PKCS1_H__ +#define BOTAN_EME_PKCS1_H__ + +#include <botan/eme.h> + +namespace Botan { + +/* +* EME_PKCS1v15 +*/ +class BOTAN_DLL EME_PKCS1v15 : public EME + { + public: + u32bit maximum_input_size(u32bit) const; + private: + SecureVector<byte> pad(const byte[], u32bit, u32bit, + RandomNumberGenerator&) const; + SecureVector<byte> unpad(const byte[], u32bit, u32bit) const; + }; + +} + +#endif diff --git a/botan/src/pk_pad/eme_pkcs/info.txt b/botan/src/pk_pad/eme_pkcs/info.txt new file mode 100644 index 0000000..88d9caf --- /dev/null +++ b/botan/src/pk_pad/eme_pkcs/info.txt @@ -0,0 +1,10 @@ +realname "PKCSv1 v1.5 EME" + +define EME_PKCS1v15 + +load_on auto + +<add> +eme_pkcs.h +eme_pkcs.cpp +</add> |