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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 | 10 | { |
31 | 10 | BYTE *pb = outVal->buffer; |
32 | 10 | UINT16 unpaddedSize = (((UINT16) BN_num_bits(inVal) + 7) / 8); |
33 | 10 | outVal->size = size; |
34 | 10 | if(size < unpaddedSize) |
35 | 0 | return FALSE; |
36 | | |
37 | 10 | size -= unpaddedSize; |
38 | 13 | for(;size > 0; size--) |
39 | 3 | *pb++ = 0; |
40 | 10 | BN_bn2bin(inVal, pb); |
41 | 10 | return TRUE; |
42 | 10 | } |
43 | | // |
44 | | // |
45 | | // Copy2B() |
46 | | // |
47 | | // This function copies a TPM2B structure. The compiler can't generate a copy of a TPM2B generic |
48 | | // structure because the actual size is not known. This function performs the copy on any TPM2B pair. The |
49 | | // size of the destination should have been checked before this call to make sure that it will hold the TPM2B |
50 | | // being copied. |
51 | | // This replicates the functionality in the MemoryLib.c. |
52 | | // |
53 | | void |
54 | | Copy2B( |
55 | | TPM2B *out, // OUT: The TPM2B to receive the copy |
56 | | TPM2B *in // IN: the TPM2B to copy |
57 | | ) |
58 | 0 | { |
59 | 0 | BYTE *pIn = in->buffer; |
60 | 0 | BYTE *pOut = out->buffer; |
61 | 0 | int count; |
62 | 0 | out->size = in->size; |
63 | 0 | for(count = in->size; count > 0; count--) |
64 | 0 | *pOut++ = *pIn++; |
65 | 0 | return; |
66 | 0 | } |
67 | | // |
68 | | // |
69 | | // BnFrom2B() |
70 | | // |
71 | | // This function creates a BIGNUM from a TPM2B and fails if the conversion fails. |
72 | | // |
73 | | BIGNUM * |
74 | | BnFrom2B( |
75 | | BIGNUM *out, // OUT: The BIGNUM |
76 | | const TPM2B *in // IN: the TPM2B to copy |
77 | | ) |
78 | 24 | { |
79 | 24 | if(BN_bin2bn(in->buffer, in->size, out) == NULL) |
80 | 0 | FAIL(FATAL_ERROR_INTERNAL); |
81 | 24 | return out; |
82 | 24 | } |