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AI_BSSecretSharing
18 RSA BSAFE Crypto-C Library Reference Manual
You must supply an initialized random algorithm to B_EncryptUpdate. (The random
algorithm is used only on the first call to
B_EncryptUpdate). Supply
(B_ALGORITHM_OBJ)NULL_PTR as the
randomAlgorithm
for B_EncryptFinal.
B_DecryptUpdate must be called
threshold
times to supply enough shares to recover
the secret key.
B_DecryptFinal returns a status of BE_INPUT_COUNT if the number of
calls to
B_DecryptUpdate is less than the
threshold
; otherwise, it returns a success
status and outputs the secret key.
Supply (
B_ALGORITHM_OBJ)NULL_PTR as the
randomAlgorithm
for B_DecryptUpdate and
B_DecryptFinal. Supply (B_KEY_OBJ)NULL_PTR as the
keyObject
for B_EncryptInit
and
B_DecryptInit.
Output considerations:
The size of the output from each call to B_EncryptUpdate will be one byte more than
the size of the secret. That byte represents the share.