| Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame^] | 1 | // This file was extracted from the TCG Published |
| 2 | // Trusted Platform Module Library |
| 3 | // Part 4: Supporting Routines |
| 4 | // Family "2.0" |
| 5 | // Level 00 Revision 01.16 |
| 6 | // October 30, 2014 |
| 7 | |
| 8 | #include "OsslCryptoEngine.h" |
| 9 | // |
| 10 | // |
| 11 | // Functions |
| 12 | // |
| 13 | // BnTo2B() |
| 14 | // |
| 15 | // This function is used to convert a BigNum() to a byte array of the specified size. If the number is too large |
| 16 | // to fit, then 0 is returned. Otherwise, the number is converted into the low-order bytes of the provided array |
| 17 | // and the upper bytes are set to zero. |
| 18 | // |
| 19 | // Return Value Meaning |
| 20 | // |
| 21 | // 0 failure (probably fatal) |
| 22 | // 1 conversion successful |
| 23 | // |
| 24 | BOOL |
| 25 | BnTo2B( |
| 26 | TPM2B *outVal, // OUT: place for the result |
| 27 | BIGNUM *inVal, // IN: number to convert |
| 28 | UINT16 size // IN: size of the output. |
| 29 | ) |
| 30 | { |
| 31 | BYTE *pb = outVal->buffer; |
| 32 | outVal->size = size; |
| 33 | size = size - (((UINT16) BN_num_bits(inVal) + 7) / 8); |
| 34 | if(size < 0) |
| 35 | return FALSE; |
| 36 | for(;size > 0; size--) |
| 37 | *pb++ = 0; |
| 38 | BN_bn2bin(inVal, pb); |
| 39 | return TRUE; |
| 40 | } |
| 41 | // |
| 42 | // |
| 43 | // Copy2B() |
| 44 | // |
| 45 | // This function copies a TPM2B structure. The compiler can't generate a copy of a TPM2B generic |
| 46 | // structure because the actual size is not known. This function performs the copy on any TPM2B pair. The |
| 47 | // size of the destination should have been checked before this call to make sure that it will hold the TPM2B |
| 48 | // being copied. |
| 49 | // This replicates the functionality in the MemoryLib.c. |
| 50 | // |
| 51 | void |
| 52 | Copy2B( |
| 53 | TPM2B *out, // OUT: The TPM2B to receive the copy |
| 54 | TPM2B *in // IN: the TPM2B to copy |
| 55 | ) |
| 56 | { |
| 57 | BYTE *pIn = in->buffer; |
| 58 | BYTE *pOut = out->buffer; |
| 59 | int count; |
| 60 | out->size = in->size; |
| 61 | for(count = in->size; count > 0; count--) |
| 62 | *pOut++ = *pIn++; |
| 63 | return; |
| 64 | } |
| 65 | // |
| 66 | // |
| 67 | // BnFrom2B() |
| 68 | // |
| 69 | // This function creates a BIGNUM from a TPM2B and fails if the conversion fails. |
| 70 | // |
| 71 | BIGNUM * |
| 72 | BnFrom2B( |
| 73 | BIGNUM *out, // OUT: The BIGNUM |
| 74 | const TPM2B *in // IN: the TPM2B to copy |
| 75 | ) |
| 76 | { |
| 77 | if(BN_bin2bn(in->buffer, in->size, out) == NULL) |
| 78 | FAIL(FATAL_ERROR_INTERNAL); |
| 79 | return out; |
| 80 | } |