Problem 44965. Optimal Asymmetric Encryption Padding decoding of message for RSA Cryptography

EME-OAEP decoding by reversing the Feistel network using previously determined mask generation function (MGF1) and SHA-1 hashing. A matrix of octets is provided as the input (EM) which is the output of EME-OAEP encoding (see problem 44964/below link, section 9.1.1.2). The label (L) is not provided or checked against the encoded label. No error checks should be conducted. Output should be the character string represented by the octets.
For example:
EM = [0,167,202,74,98,63,234,235,44,82,53,39,70,214,204,79,45,80,35,147,55,32,35,39,45,...
87,180,129,63,219,223,165,72,19,131,160,131,131,107,231,157,238,213,10,237,132,55,...
35,182,202,151,21,82,130,121,35,14,35,75,255,236,72,45,210,0,243,57,43,137,79,9,...
217,83,81,227,171,156,105,168,121,224,201,41,98,84,79,3,247,109,100,214,227,120,...
148,12,50,108,248,32,94];%input
M = 'I like to swim.';%output
See: https://www.foo.be/docs/opensst/ref/pkcs/pkcs-1/pkcs-1v2-1d1.pdf
Solve

Solution Stats

75.0% Correct | 25.0% Incorrect
Last Solution submitted on Oct 15, 2025

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