/********************************************************************************/ /* */ /* Miscellaneous Memory Manipulation Routines */ /* Written by Ken Goldman */ /* IBM Thomas J. Watson Research Center */ /* $Id: Memory.c 1658 2021-01-22 23:14:01Z kgoldman $ */ /* */ /* Licenses and Notices */ /* */ /* 1. 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Many of the functions have the same semantics as functions defined in string.h. Those functions are not used directly in the TPM because they are not safe */ /* This version uses string.h after adding guards. This is because the math libraries invariably use those functions so it is not practical to prevent those library functions from being pulled into the build. */ /* 9.12.2 Includes and Data Definitions */ #include "Tpm.h" #include "Memory_fp.h" /* 9.12.3 Functions */ /* 9.12.3.1 MemoryCopy() */ /* This is an alias for memmove. This is used in place of memcpy because some of the moves may overlap and rather than try to make sure that memmove is used when necessary, it is always used. */ void MemoryCopy( void *dest, const void *src, int sSize ) { if (dest != src) memmove(dest, src, sSize); } /* 9.12.3.2 MemoryEqual() */ /* This function indicates if two buffers have the same values in the indicated number of bytes. */ /* Return Values Meaning */ /* TRUE all octets are the same */ /* FALSE all octets are not the same */ BOOL MemoryEqual( const void *buffer1, // IN: compare buffer1 const void *buffer2, // IN: compare buffer2 unsigned int size // IN: size of bytes being compared ) { BYTE equal = 0; const BYTE *b1 = (BYTE *)buffer1; const BYTE *b2 = (BYTE *)buffer2; // // Compare all bytes so that there is no leakage of information // due to timing differences. for(; size > 0; size--) equal |= (*b1++ ^ *b2++); return (equal == 0); } /* 9.12.3.3 MemoryCopy2B() */ /* This function copies a TPM2B. This can be used when the TPM2B types are the same or different. */ /* This function returns the number of octets in the data buffer of the TPM2B. */ LIB_EXPORT INT16 MemoryCopy2B( TPM2B *dest, // OUT: receiving TPM2B const TPM2B *source, // IN: source TPM2B unsigned int dSize // IN: size of the receiving buffer ) { pAssert(dest != NULL); if(source == NULL) dest->size = 0; else { pAssert(source->size <= dSize); MemoryCopy(dest->buffer, source->buffer, source->size); dest->size = source->size; } return dest->size; } /* 9.12.3.4 MemoryConcat2B() */ /* This function will concatenate the buffer contents of a TPM2B to the buffer contents of another TPM2B and adjust the size accordingly (a := (a | b)). */ void MemoryConcat2B( TPM2B *aInOut, // IN/OUT: destination 2B TPM2B *bIn, // IN: second 2B unsigned int aMaxSize // IN: The size of aInOut.buffer (max values for // aInOut.size) ) { pAssert(bIn->size <= aMaxSize - aInOut->size); MemoryCopy(&aInOut->buffer[aInOut->size], &bIn->buffer, bIn->size); aInOut->size = aInOut->size + bIn->size; return; } /* 9.12.3.5 MemoryEqual2B() */ /* This function will compare two TPM2B structures. To be equal, they need to be the same size and the buffer contexts need to be the same in all octets. */ /* Return Values Meaning */ /* TRUE size and buffer contents are the same */ /* FALSE size or buffer contents are not the same */ BOOL MemoryEqual2B( const TPM2B *aIn, // IN: compare value const TPM2B *bIn // IN: compare value ) { if(aIn->size != bIn->size) return FALSE; return MemoryEqual(aIn->buffer, bIn->buffer, aIn->size); } /* 9.12.3.6 MemorySet() */ /* This function will set all the octets in the specified memory range to the specified octet value. */ /* NOTE: A previous version had an additional parameter (dSize) that was intended to make sure that the destination would not be overrun. The problem is that, in use, all that was happening was that the value of size was used for dSize so there was no benefit in the extra parameter. */ void MemorySet( void *dest, int value, size_t size ) { memset(dest, value, size); } /* 9.12.3.7 MemoryPad2B() */ /* Function to pad a TPM2B with zeros and adjust the size. */ void MemoryPad2B( TPM2B *b, UINT16 newSize ) { MemorySet(&b->buffer[b->size], 0, newSize - b->size); b->size = newSize; } /* 9.12.3.8 Uint16ToByteArray() */ /* Function to write an integer to a byte array */ void Uint16ToByteArray( UINT16 i, BYTE *a ) { a[1] = (BYTE)(i); i >>= 8; a[0] = (BYTE)(i); } /* 9.12.3.9 Uint32ToByteArray() */ /* Function to write an integer to a byte array */ void Uint32ToByteArray( UINT32 i, BYTE *a ) { a[3] = (BYTE)(i); i >>= 8; a[2] = (BYTE)(i); i >>= 8; a[1] = (BYTE)(i); i >>= 8; a[0] = (BYTE)(i); } /* 9.12.3.10 Uint64ToByteArray() */ /* Function to write an integer to a byte array */ void Uint64ToByteArray( UINT64 i, BYTE *a ) { a[7] = (BYTE)(i); i >>= 8; a[6] = (BYTE)(i); i >>= 8; a[5] = (BYTE)(i); i >>= 8; a[4] = (BYTE)(i); i >>= 8; a[3] = (BYTE)(i); i >>= 8; a[2] = (BYTE)(i); i >>= 8; a[1] = (BYTE)(i); i >>= 8; a[0] = (BYTE)(i); } /* 9.12.3.11 ByteArrayToUint8() */ /* Function to write a UINT8 to a byte array. This is included for completeness and to allow certain macro expansions */ UINT8 ByteArrayToUint8( BYTE *a ) { return *a; } /* 9.12.3.12 ByteArrayToUint16() */ /* Function to write an integer to a byte array */ UINT16 ByteArrayToUint16( BYTE *a ) { return ((UINT16)a[0] << 8) + a[1]; } /* 9.12.3.13 ByteArrayToUint32() */ /* Function to write an integer to a byte array */ UINT32 ByteArrayToUint32( BYTE *a ) { return (UINT32)((((((UINT32)a[0] << 8) + a[1]) << 8) + (UINT32)a[2]) << 8) + a[3]; } /* 9.12.3.14 ByteArrayToUint64() */ /* Function to write an integer to a byte array */ UINT64 ByteArrayToUint64( BYTE *a ) { return (((UINT64)BYTE_ARRAY_TO_UINT32(a)) << 32) + BYTE_ARRAY_TO_UINT32(&a[4]); }