static int salsa208poly1305_encrypt(uint8_t *c, const uint8_t *m, const uint32_t mlen, const uint8_t *n, const uint8_t *k) { uint8_t c*k[COKB]; crypto_stream_salsa208(c*k, COKB, n, k); crypto_stream_salsa208_xor(c + COB, m, mlen, n, k); crypto_onetimeauth_poly1305(c, c + COB, mlen, c*k); return 0; }
int crypto_secretbox_salsa208poly1305_open( unsigned char *m, const unsigned char *c,unsigned long long clen, const unsigned char *n, const unsigned char *k ) { int i; unsigned char subkey[32]; if (clen < 32) return -1; crypto_stream_salsa208(subkey,32,n,k); if (crypto_onetimeauth_poly1305_verify(c + 16,c + 32,clen - 32,subkey) != 0) return -1; crypto_stream_salsa208_xor(m,c,clen,n,k); for (i = 0;i < 32;++i) m[i] = 0; return 0; }
static int salsa208poly1305_decrypt(uint8_t *m, const uint8_t *c, const uint32_t clen, const uint8_t *n, const uint8_t *k) { uint8_t c*k[COKB]; if (clen < COB) { return -1; } int mlen = clen - COB; crypto_stream_salsa208(c*k, COKB, n, k); if (crypto_onetimeauth_poly1305_verify(c, c + COB, mlen, c*k) == 0) { return crypto_stream_salsa208_xor(m, c + COB, mlen, n, k); } return -1; }