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CertCompareIntegerBlob (Compact 2013)

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3/28/2014

This function compares two integer BLOB structures to determine whether they represent equal numeric values. Before doing the comparison, most significant bytes with a value of 0x00 are removed from a positive number. Positive means that the most significant bit in the next nonzero byte is not set.

Syntax

BOOL WINAPI CertCompareIntegerBlob(
  PCRYPT_INTEGER_BLOB pInt1,
  PCRYPT_INTEGER_BLOB pInt2
);

Parameters

  • pInt1
    [in] Pointer to a CRYPT_INTEGER_BLOB structure containing the first integer in the comparison.
  • pInt2
    [in] Pointer to a CRYPT_INTEGER_BLOB structure containing the second integer in the comparison.

Return Value

If the representations of the integer BLOB structures are identical and the function succeeds, the return value is nonzero, or TRUE.

If the function fails, the return value is zero, or FALSE.

For extended error information, call the GetLastError function.

Remarks

Most significant bytes with a value of 0xFF are removed from a negative number. Negative means that the most significant bit in the next non-0xFF byte is set. This produces the unique representation of that integer. The following table shows examples of this representation.

Original bytes

Reduced form

0xFFFFFF88

0xFF88

0xFF23

0xFF23

0x007F

0x7F

0x00000080

0x80

Multiple-byte integers are treated as little-endian. The least significant byte is pbData[0]. The most significant byte is pbData[cbData - 1]; that is, 0xFFFFFF88 is stored in four bytes as {0x88, 0xFF, 0xFF, 0xFF}.

Requirements

Header

wincrypt.h

Library

crypt32.lib

See Also

Reference

Certificates Functions
BLOB (Cryptography)
BLOB (Cryptography)