Question

How do I do the equivalent of the following C++ code in go?

RSA *key = PEM_read_RSAPrivateKey(f, NULL, NULL, NULL);
std::vector<CK_BYTE> out(128);
RSA_private_encrypt(in.size(), &in[0], &out[0], key, RSA_PKCS1_PADDING)

I ve looked at the Go rsa package. It looks like EncryptPKCS1v15() may be the equivalent of RSA_private_encrypt(). But I don t see how to create a PrivateKey object other than with GenerateKey(), which (one can confirm by looking at the source) generates one using random prime numbers.

Do I need to figure out how to decode a PEM file so pull out the PrivateKey fields values?

Update: The equivalent to the above C++ code in Python is:

from M2Crypto import RSA
rsa_private_key = RSA.load_key( privkey.pem )
encrypted = rsa_private_key.private_encrypt(digest, RSA.pkcs1_padding)

Is there an existing equivalent in Go?

Answer 1

The equivalent function appears to be SignPKCS1v15. The function ParsePKCS1PrivateKey in the crypto/x509 package appears to be the closest to what you need to read in your existing private key, but I m not sure the PEM format is exactly compatible, which it must be for this to work.

Answer 2

I think you may be looking for crypto/tls, not crypto/rsa.

I m not 100% sure what you re trying to do here, but the tls package does have some functionality for reading PEM files.

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