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created calculate_ecdh_secret fn

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calculates shared secret (ECDH)
This commit is contained in:
Václav Šmejkal 2025-02-01 14:53:46 +01:00
parent 145f8d790f
commit bf583fd495
Signed by: ENGO150
GPG Key ID: 4A57E86482968843
1 changed files with 17 additions and 0 deletions
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17
src/chat/crypto.c
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@ -97,6 +97,23 @@ char *base64_decode(char *encoded_message, size_t *length)
return decoded_message; return decoded_message;
} }
void calculate_ecdh_secret(EVP_PKEY *pri, EVP_PKEY *pub, char **secret, size_t *len)
{
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pri, NULL);
EVP_PKEY_derive_init(ctx); //INIT DERIVE CONTEXT
EVP_PKEY_derive_set_peer(ctx, pub); //CONFIG
//ALLOCATE
EVP_PKEY_derive(ctx, NULL, len); //CALCULATE LENGTH
*secret = why2_malloc(*len);
EVP_PKEY_derive(ctx, (unsigned char*) *secret, len); //GET SHARED SECRET
//DEALLOCATION
EVP_PKEY_CTX_free(ctx);
}
//GLOBAL //GLOBAL
void why2_chat_init_keys(void) void why2_chat_init_keys(void)
{ {