Wow,
That was quite the oversight of mine. That fixed the issue. Thanks so much, I appreciate your patience in dealing with my confusion over the APIs!
Cheers,
Ethan
On Sat, Mar 11, 2017 at 12:28 PM, Matt Caswell <matt@xxxxxxxxxxx> wrote:
On 11/03/17 18:38, Ethan Rahn wrote:
> size_t sharedSecretLen = 0;
Set this to sizeof(sharedSecret).
>
> // Now derive the Shared Secret
> EVP_PKEY_CTX *ctx;
>
> ctx = EVP_PKEY_CTX_new(pkey, NULL);
> if (!ctx){
> fprintf( stderr, "Failed to make EVP_PKEY ctx\n" );
> ERR_load_crypto_strings();
This should be called once at the start of your program - *before* any
calls that might generate an error.
> if (EVP_PKEY_derive(ctx, sharedSecret, &sharedSecretLen) <= 0){
From the EVP_PKEY_derive documentation:
https://www.openssl.org/docs/man1.0.2/crypto/EVP_PKEY_ derive.html
"If key is not NULL then before the call the keylen parameter should
contain the length of the key buffer, if the call is successful the
shared secret is written to key and the amount of data written to keylen."
Matt
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