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The Password-Based Key Derivation Function 2 (PBKDF2) is a method of securely deriving encryption keys from a passphrase entered by a user. It features an iteration count that can be deliberately adjusted (key stretching) to slow down brute force password guessing attacks.
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OpenSSL PBKDF2 documentation
In 0.9.8 there is only PKCS5_PBKDF2_HMAC_SHA1.
Sample C code:
#include <openssl/evp.h>
#include <openssl/sha.h>
void PBKDF2_HMAC_SHA_1nat(const char* pass, const unsigned char* salt, int32_t iterat …