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80 lines
2.3 KiB
80 lines
2.3 KiB
// This file was extracted from the TCG Published |
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// Trusted Platform Module Library |
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// Part 4: Supporting Routines |
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// Family "2.0" |
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// Level 00 Revision 01.16 |
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// October 30, 2014 |
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#include "OsslCryptoEngine.h" |
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// |
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// |
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// Functions |
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// |
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// BnTo2B() |
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// |
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// This function is used to convert a BigNum() to a byte array of the specified size. If the number is too large |
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// to fit, then 0 is returned. Otherwise, the number is converted into the low-order bytes of the provided array |
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// and the upper bytes are set to zero. |
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// |
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// Return Value Meaning |
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// |
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// 0 failure (probably fatal) |
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// 1 conversion successful |
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// |
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BOOL |
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BnTo2B( |
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TPM2B *outVal, // OUT: place for the result |
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BIGNUM *inVal, // IN: number to convert |
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UINT16 size // IN: size of the output. |
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) |
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{ |
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BYTE *pb = outVal->buffer; |
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outVal->size = size; |
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size = size - (((UINT16) BN_num_bits(inVal) + 7) / 8); |
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if(size < 0) |
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return FALSE; |
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for(;size > 0; size--) |
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*pb++ = 0; |
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BN_bn2bin(inVal, pb); |
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return TRUE; |
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} |
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// |
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// |
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// Copy2B() |
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// |
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// This function copies a TPM2B structure. The compiler can't generate a copy of a TPM2B generic |
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// structure because the actual size is not known. This function performs the copy on any TPM2B pair. The |
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// size of the destination should have been checked before this call to make sure that it will hold the TPM2B |
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// being copied. |
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// This replicates the functionality in the MemoryLib.c. |
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// |
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void |
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Copy2B( |
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TPM2B *out, // OUT: The TPM2B to receive the copy |
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TPM2B *in // IN: the TPM2B to copy |
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) |
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{ |
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BYTE *pIn = in->buffer; |
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BYTE *pOut = out->buffer; |
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int count; |
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out->size = in->size; |
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for(count = in->size; count > 0; count--) |
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*pOut++ = *pIn++; |
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return; |
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} |
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// |
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// |
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// BnFrom2B() |
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// |
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// This function creates a BIGNUM from a TPM2B and fails if the conversion fails. |
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// |
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BIGNUM * |
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BnFrom2B( |
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BIGNUM *out, // OUT: The BIGNUM |
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const TPM2B *in // IN: the TPM2B to copy |
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) |
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{ |
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if(BN_bin2bn(in->buffer, in->size, out) == NULL) |
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FAIL(FATAL_ERROR_INTERNAL); |
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return out; |
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}
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