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m Unclear where mLen came into the picture before, added slight clarification |
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* ''hLen'' is the length of the output of the hash function in bytes,
* ''k'' is the length of the [[RSA (cryptosystem)|RSA]] modulus ''n'' in bytes,
* ''M'' is the message to be padded, with length ''mLen'' (at most <math>\mathrm{mLen}= k - 2 \cdot \mathrm{hLen} - 2</math> bytes),
* ''L'' is an optional label to be associated with the message (the label is the empty string by default and can be used to authenticate data without requiring encryption),
* ''PS'' is a byte string of <math>k - \mathrm{mLen} - 2 \cdot \mathrm{hLen} - 2</math> null-bytes.
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