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Key Derivation functions from ISO 18033 and PKCS#1

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KDF - Key derivation functions from ISO 18033 and PKCS#1
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Key derivation functions (KDF1,KDF2,KDF3,KDF4) as defined in section 6.2 of ISO 18033
Mask Generation Function (MGF1) as defined in Annex B.2.1 of PKCS#1 and IEEE P1363

A key derivation function is a function KDF (x, l) that takes as input an octet string x and
an integer l >= 0, and outputs an octet string of length l. The string x is of arbitrary length,
although an implementation may define a (very large) maximum length for x and maximum size
for l, and fail if these bounds are exceeded.

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