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AI_RSAPublic
214 RSA BSAFE Crypto-C Library Reference Manual
AI_RSAPublic
Purpose:
This AI allows you to decrypt data using the raw RSA algorithm. You can find the
description of this algorithm in B. Schneier's
Applied Cryptography
.
AI_RSAPublic is different from AI_PKCS_RSAPublic because the latter allows you to
decrypt
k
-11 bytes, where
k
is the size of the modulus in bytes, while you can use the
former to decrypt up to
k
bytes. Note that it is the application’s responsibility to strip
the padding that was appended by the application to the data during encryption with
AI_RSAPrivate.
Because this algorithm does not pad, the total number of input bytes must be a
multiple of the key’s modulus size in bytes. Also, each modulus-size block of input,
interpreted as an integer with the most significant byte first, must be numerically less
than the key's modulus.
To perform RSA decryption you can also use
AI_PKCS_RSAPublic and
AI_SET_OAEP_RSAPublic. But you can use AI_RSAPublic only if the data has been
encrypted with
AI_RSAPrivate.
Type of information this allows you to use:
the RSA algorithm for performing raw public-key decryption.
Format of info supplied to B_SetAlgorithmInfo:
NULL_PTR.
Format of info returned by B_GetAlgorithmInfo:
NULL_PTR.
Crypto-C procedures to use with algorithm object:
B_EncryptInit, B_EncryptUpdate, B_EncryptFinal, B_DecryptInit,
B_DecryptUpdate, and B_DecryptFinal. You may pass (B_ALGORITHM_OBJ)NULL_PTR
for all
randomAlgorithm
arguments.