Add the SM4 block cipher, also a no-padding option for decrypting block ciphers. #1189
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This adds an implementation of the SM4 block cipher, and operations to encrypt and decrypt using it with CBC,ECB,CFB,OFB,CTR modes. Also, a "no padding" option is added for AES,DES,3DES and SM4 decryption in ECB/CBC modes. This variant does not attempt to validate the last block as being PKCS#7 padded. This is useful, both since other padding schemes exist, and also for decrypting data where the final block is missing.
This was referenced Mar 29, 2022
This was referenced Jul 14, 2022
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This adds an implementation of the SM4 block cipher, and operations
to encrypt and decrypt using it with CBC,ECB,CFB,OFB,CTR modes.
Also, a "no padding" option is added for AES,DES,3DES and SM4
decryption in ECB/CBC modes. This variant does not attempt to
validate the last block as being PKCS#7 padded.
This is useful, both since other padding schemes exist, and also
for decrypting data where the final block is missing or corrupted.
Adds no new external dependencies.