Reading a binary RSA key from memory?

[elseifthen]

I wanted to store an RSA key in binary format in the code and retrieve it via e.g. xmlSecKeyReadMemory(xmlSecKeyDataRsaId, c_key, i_len) but that doesn't seem to work as the binRead function is not associated with the type xmlSecKeyDataRsaId . I managed to load the key in pem format via xmlSecCryptoAppKeyLoadMemory(c_key, i_len, xmlSecKeyDataFormatPem, NULL, NULL, NULL) but my question is: is it possible at all to load a binary version of the RSA key from memory or is there a fundamental problem with that?
N.B.: I succeeded in loading a symmetric (AES) key from memory.

[lsh123]

First, this functionality is crypto library specific. If you are using default OpenSSL, then multiple RSA key formats are supported -- PEM, DER, ...:

xmlsec/src/openssl/app.c

Line 304 in fd87b54

xmlSecOpenSSLAppKeyLoadBIO(BIO* bio, xmlSecKeyDataFormat format,

Note that RSA key has multiple components while AES/DES keys have only one. Thus, you need to know how these components are stored in memory to correctly read the key.

You can also use something like xmlSecOpenSSLEvpKeyDataAdoptEvp() function to use an RSA key stored in OpenSSL EVP key which can be initialized / loaded using any relevant OpenSSL functions (e.g. EVP key can be on a hardware device).

Aleksey

[elseifthen]

Thanks for the hints! Using the xmlSecKeyDataFormatDer format, loading the binary version of the RSA key works with
xmlSecCryptoAppKeyLoadMemory(c_key, i_len, xmlSecKeyDataFormatDer, NULL, NULL, NULL)