libflint/docs/crypto.md

crypto

Cryptographic library

Functions

b64_encode

Encodes an unsigned char * into base64. User is responsible for freeing the char * that is returned.

char *b64_encode(const unsigned char *s, size_t sz);

b64_decode

Decodes a base64 encoded set of bytes into an unsigned char *. User is responsible for freeing the unsigned char * that is returned. decode_sz is an optional argument in case you need to know the size of the decoded data, otherwise you can just pass NULL.

unsigned char *b64_decode(const char *s, size_t sz, size_t *decode_sz);

hex_decode

Decodes a string of characters representing hexadecimal bytes into an array of unsigned char. For example, converts "DEADBEEF" into [0xDE, 0xAD, 0xBE, 0xEF].

unsigned char *hex_decode(const char *orig, size_t *sz);

// Example
s = hex_decode("DEADBEEF", &s_sz);
unsigned char h[4] = {
    0xDE, 0xAD, 0xBE, 0xEF
};
for (size_t i = 0; i < 4; ++i) {
    assert(s[i] == h[i]);
}
free(s);