1 /* This file is in the public domain. */ 2 3 #include <sys/cdefs.h> 4 __FBSDID("$FreeBSD$"); 5 6 #include <crypto/chacha20/chacha.h> 7 #include <opencrypto/xform_enc.h> 8 9 static int 10 chacha20_xform_setkey(void *ctx, const uint8_t *key, int len) 11 { 12 13 if (len != CHACHA_MINKEYLEN && len != 32) 14 return (EINVAL); 15 16 chacha_keysetup(ctx, key, len * 8); 17 return (0); 18 } 19 20 static void 21 chacha20_xform_reinit(void *ctx, const uint8_t *iv, size_t ivlen) 22 { 23 KASSERT(ivlen == CHACHA_NONCELEN + CHACHA_CTRLEN, 24 ("%s: invalid IV length", __func__)); 25 chacha_ivsetup(ctx, iv + 8, iv); 26 } 27 28 static void 29 chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out) 30 { 31 32 chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN); 33 } 34 35 static void 36 chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out, 37 size_t len) 38 { 39 40 chacha_encrypt_bytes(ctx, in, out, len); 41 } 42 43 const struct enc_xform enc_xform_chacha20 = { 44 .type = CRYPTO_CHACHA20, 45 .name = "chacha20", 46 .ctxsize = sizeof(struct chacha_ctx), 47 .blocksize = 1, 48 .native_blocksize = CHACHA_BLOCKLEN, 49 .ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN, 50 .minkey = CHACHA_MINKEYLEN, 51 .maxkey = 32, 52 .encrypt = chacha20_xform_crypt, 53 .decrypt = chacha20_xform_crypt, 54 .setkey = chacha20_xform_setkey, 55 .reinit = chacha20_xform_reinit, 56 .encrypt_last = chacha20_xform_crypt_last, 57 .decrypt_last = chacha20_xform_crypt_last, 58 }; 59