signature - Compute a Digital Signature for a Image Colormap
ComputeMessageDigest(message_digest,input_message,message_length)
InitializeMessageDigest(message_digest)
SignatureImage(image)
TransformMessageDigest(message_digest,message)
UpdateMessageDigest(message_digest,input_message,message_length)
Function ComputeMessageDigest computes the message digest.
The format of the ComputeMessageDigest routine is:
ComputeMessageDigest(message_digest,input_message,message_length)
A description of each parameter follows:
- o message_digest:
-
The address of a structure of type MessageDigest.
Function InitializeMessageDigest initializes the message digest structure.
The format of the InitializeMessageDigest routine is:
InitializeMessageDigest(message_digest)
A description of each parameter follows:
- o message_digest:
-
The address of a structure of type MessageDigest.
Function TransformMessageDigest updates the message digest.
The format of the TransformMessageDigest routine is:
TransformMessageDigest(message_digest,message)
A description of each parameter follows:
- o message_digest:
-
The address of a structure of type MessageDigest.
Function UpdateMessageDigest updates the message digest.
The format of the UpdateMessageDigest routine is:
UpdateMessageDigest(message_digest,input_message,message_length)
A description of each parameter follows:
- o message_digest:
-
The address of a structure of type MessageDigest.
Function SignatureImage computes a digital signature from an image. This
signature uniquely identifies the image and is convenient for determining
if the colormap of a sequence of images is identical when animating. The
digital signature is from RSA Data Security MD5 Digest Algorithm described
in Internet draft [MD5], July 1992.
The format of the SignatureImage routine is:
SignatureImage(image)
A description of each parameter follows:
- o image:
-
The address of a structure of type Image.