diff options
Diffstat (limited to '')
| -rw-r--r-- | CryptoPP/cmac.cpp | 244 |
1 files changed, 122 insertions, 122 deletions
diff --git a/CryptoPP/cmac.cpp b/CryptoPP/cmac.cpp index e8fa6fea6..a31d5f8b0 100644 --- a/CryptoPP/cmac.cpp +++ b/CryptoPP/cmac.cpp @@ -1,122 +1,122 @@ -// cmac.cpp - written and placed in the public domain by Wei Dai
-
-#include "pch.h"
-
-#ifndef CRYPTOPP_IMPORTS
-
-#include "cmac.h"
-
-NAMESPACE_BEGIN(CryptoPP)
-
-static void MulU(byte *k, unsigned int length)
-{
- byte carry = 0;
-
- for (int i=length-1; i>=1; i-=2)
- {
- byte carry2 = k[i] >> 7;
- k[i] += k[i] + carry;
- carry = k[i-1] >> 7;
- k[i-1] += k[i-1] + carry2;
- }
-
- if (carry)
- {
- switch (length)
- {
- case 8:
- k[7] ^= 0x1b;
- break;
- case 16:
- k[15] ^= 0x87;
- break;
- case 32:
- k[30] ^= 4;
- k[31] ^= 0x23;
- break;
- default:
- throw InvalidArgument("CMAC: " + IntToString(length) + " is not a supported cipher block size");
- }
- }
-}
-
-void CMAC_Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
-{
- BlockCipher &cipher = AccessCipher();
- unsigned int blockSize = cipher.BlockSize();
-
- cipher.SetKey(key, length, params);
- m_reg.CleanNew(3*blockSize);
- m_counter = 0;
-
- cipher.ProcessBlock(m_reg, m_reg+blockSize);
- MulU(m_reg+blockSize, blockSize);
- memcpy(m_reg+2*blockSize, m_reg+blockSize, blockSize);
- MulU(m_reg+2*blockSize, blockSize);
-}
-
-void CMAC_Base::Update(const byte *input, size_t length)
-{
- if (!length)
- return;
-
- BlockCipher &cipher = AccessCipher();
- unsigned int blockSize = cipher.BlockSize();
-
- if (m_counter > 0)
- {
- unsigned int len = UnsignedMin(blockSize - m_counter, length);
- xorbuf(m_reg+m_counter, input, len);
- length -= len;
- input += len;
- m_counter += len;
-
- if (m_counter == blockSize && length > 0)
- {
- cipher.ProcessBlock(m_reg);
- m_counter = 0;
- }
- }
-
- if (length > blockSize)
- {
- assert(m_counter == 0);
- size_t leftOver = 1 + cipher.AdvancedProcessBlocks(m_reg, input, m_reg, length-1, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);
- input += (length - leftOver);
- length = leftOver;
- }
-
- if (length > 0)
- {
- assert(m_counter + length <= blockSize);
- xorbuf(m_reg+m_counter, input, length);
- m_counter += (unsigned int)length;
- }
-
- assert(m_counter > 0);
-}
-
-void CMAC_Base::TruncatedFinal(byte *mac, size_t size)
-{
- ThrowIfInvalidTruncatedSize(size);
-
- BlockCipher &cipher = AccessCipher();
- unsigned int blockSize = cipher.BlockSize();
-
- if (m_counter < blockSize)
- {
- m_reg[m_counter] ^= 0x80;
- cipher.AdvancedProcessBlocks(m_reg, m_reg+2*blockSize, m_reg, blockSize, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);
- }
- else
- cipher.AdvancedProcessBlocks(m_reg, m_reg+blockSize, m_reg, blockSize, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput);
-
- memcpy(mac, m_reg, size);
-
- m_counter = 0;
- memset(m_reg, 0, blockSize);
-}
-
-NAMESPACE_END
-
-#endif
+// cmac.cpp - written and placed in the public domain by Wei Dai + +#include "pch.h" + +#ifndef CRYPTOPP_IMPORTS + +#include "cmac.h" + +NAMESPACE_BEGIN(CryptoPP) + +static void MulU(byte *k, unsigned int length) +{ + byte carry = 0; + + for (int i=length-1; i>=1; i-=2) + { + byte carry2 = k[i] >> 7; + k[i] += k[i] + carry; + carry = k[i-1] >> 7; + k[i-1] += k[i-1] + carry2; + } + + if (carry) + { + switch (length) + { + case 8: + k[7] ^= 0x1b; + break; + case 16: + k[15] ^= 0x87; + break; + case 32: + k[30] ^= 4; + k[31] ^= 0x23; + break; + default: + throw InvalidArgument("CMAC: " + IntToString(length) + " is not a supported cipher block size"); + } + } +} + +void CMAC_Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms) +{ + BlockCipher &cipher = AccessCipher(); + unsigned int blockSize = cipher.BlockSize(); + + cipher.SetKey(key, length, params); + m_reg.CleanNew(3*blockSize); + m_counter = 0; + + cipher.ProcessBlock(m_reg, m_reg+blockSize); + MulU(m_reg+blockSize, blockSize); + memcpy(m_reg+2*blockSize, m_reg+blockSize, blockSize); + MulU(m_reg+2*blockSize, blockSize); +} + +void CMAC_Base::Update(const byte *input, size_t length) +{ + if (!length) + return; + + BlockCipher &cipher = AccessCipher(); + unsigned int blockSize = cipher.BlockSize(); + + if (m_counter > 0) + { + unsigned int len = UnsignedMin(blockSize - m_counter, length); + xorbuf(m_reg+m_counter, input, len); + length -= len; + input += len; + m_counter += len; + + if (m_counter == blockSize && length > 0) + { + cipher.ProcessBlock(m_reg); + m_counter = 0; + } + } + + if (length > blockSize) + { + assert(m_counter == 0); + size_t leftOver = 1 + cipher.AdvancedProcessBlocks(m_reg, input, m_reg, length-1, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput); + input += (length - leftOver); + length = leftOver; + } + + if (length > 0) + { + assert(m_counter + length <= blockSize); + xorbuf(m_reg+m_counter, input, length); + m_counter += (unsigned int)length; + } + + assert(m_counter > 0); +} + +void CMAC_Base::TruncatedFinal(byte *mac, size_t size) +{ + ThrowIfInvalidTruncatedSize(size); + + BlockCipher &cipher = AccessCipher(); + unsigned int blockSize = cipher.BlockSize(); + + if (m_counter < blockSize) + { + m_reg[m_counter] ^= 0x80; + cipher.AdvancedProcessBlocks(m_reg, m_reg+2*blockSize, m_reg, blockSize, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput); + } + else + cipher.AdvancedProcessBlocks(m_reg, m_reg+blockSize, m_reg, blockSize, BlockTransformation::BT_DontIncrementInOutPointers|BlockTransformation::BT_XorInput); + + memcpy(mac, m_reg, size); + + m_counter = 0; + memset(m_reg, 0, blockSize); +} + +NAMESPACE_END + +#endif |