CryptVerifyDetachedMessageHash (Compact 2013)

3/28/2014

This function verifies a detached hash.

Syntax

BOOL WINAPI CryptVerifyDetachedMessageHash(
        __in PCRYPT_HASH_MESSAGE_PARA pHashPara,
        __in BYTE *pbDetachedHashBlob,
        __in DWORD cbDetachedHashBlob,
        __in DWORD cToBeHashed,
        __in const BYTE *rgpbToBeHashed[],
        __in DWORD rgcbToBeHashed[],
        __out BYTE *pbComputedHash,
        __inout DWORD *pcbComputedHash
);

Parameters

• pHashPara
  [in] Pointer to a CRYPT_HASH_MESSAGE_PARA structure that contains the hash parameters.

• pbDetachedHashBlob
  [in] Pointer to the encoded, detached hash.

• cbDetachedHashBlob
  [in] Size, in bytes, of the detached hash.

• cToBeHashed
  [in] Number of elements in the rgpbToBeHashed and rgcbToBeHashed arrays.

• rgpbToBeHashed
  [in] Array of pointers to content buffers to be hashed.

• rgcbToBeHashed
  [in] Array of sizes, in bytes, for the content buffers pointed to by the elements of the rgcbToBeHashed array.

• pbComputedHash
  [out] Pointer to a buffer to receive the computed hash.

  This parameter can be NULL if the newly created hash is not needed for additional processing, or to set the size of the hash for memory allocation purposes. For more information, see Retrieving Data of Unknown Length.

• pcbComputedHash
  [in, out] Pointer to a DWORD that specifies the size, in bytes, of the pbComputedHash buffer. When the function returns, this DWORD contains the size, in bytes, of the created hash. The hash will not be returned if this parameter is NULL.

  Note

  When processing the data returned, applications must use the actual size of the data returned. The actual size can be slightly smaller than the size of the buffer specified on input. (On input, buffer sizes are usually specified large enough to ensure that the largest possible output data will fit in the buffer.) On output, the variable pointed to by this parameter is updated to reflect the actual size of the data copied to the buffer.

Return Value

If the function succeeds, the return value is nonzero (TRUE); otherwise, it is zero (FALSE).

For extended error information, call GetLastError.

The following table lists the error codes most commonly returned by the GetLastError function.

If the function fails, GetLastError may return an Abstract Syntax Notation One (ASN.1) encoding/decoding error. For information about these errors, see ASN.1 Encoding/Decoding Return Values.

Requirements

See Also

Reference

Certificates Functions