New answers tagged openssl
3
Start with saving the three parts respectively to pub.b64, priv.b64 and blob.b64:
$ base64 -d < pub.b64 | openssl asn1parse -inform DER -i
0:d=0 hl=3 l= 158 cons: SEQUENCE
3:d=1 hl=2 l= 13 cons: SEQUENCE
5:d=2 hl=2 l= 9 prim: OBJECT :rsaEncryption
16:d=2 hl=2 l= 0 prim: NULL
18:d=1 hl=3 l= 140 prim: BIT ...
0
After decoding the strings from base64 to binary, you should try the following, depending on the algorithm used.
This encodes from base64 to binary. You probably would have to do it with the keys, too (or just decode them manually)
$ openssl enc -in ciphertext -out binarytext -d -a
And to perform the decryption:
$ openssl rsautl -decrypt -in binarytext ...
3
If you can "expose the premaster secret", though the key exchange uses ephemeral Diffie-Hellman, then you have privileged access to either the client or the server. That's one of the points of DHE: the actual key exchange uses newly generated DH key pairs, which neither client or server stores anywhere except in its own RAM. Having a copy of the permanent ...
3
In OpenSSL source code, the speed aes-256-cbc function calls AES_cbc_encrypt() which itself uses AES_encrypt(), a function from crypto/aes/aes_x86core.c. It is an obvious "classical" implementation with tables.
On the other hand, with EVP, you end up in the code in crypto/evp/e_aes.c which dynamically detects whether the current CPU supports the AES-NI ...
3
For the relationships between OpenSSL and FIPS 140-2, read this documentation.
The OpenSSL FIPS Object Module is a specific subset of OpenSSL, API-compatible with OpenSSL, and provided as source code. That module has gone through the long and painful administrative process of obtaining a FIPS 140-2 validation. It has achieved the "overall level: 1" (see the ...
Top 50 recent answers are included
