xform_poly1305.c

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    1 /* This file is in the public domain. */
    2 
    3 #include <sys/cdefs.h>
    4 __FBSDID("$FreeBSD$");
    5 
    6 #include <opencrypto/xform_auth.h>
    7 
    8 #include <sodium/crypto_onetimeauth_poly1305.h>
    9 
   10 struct poly1305_xform_ctx {
   11         struct crypto_onetimeauth_poly1305_state state;
   12 };
   13 CTASSERT(sizeof(union authctx) >= sizeof(struct poly1305_xform_ctx));
   14 
   15 CTASSERT(POLY1305_KEY_LEN == crypto_onetimeauth_poly1305_KEYBYTES);
   16 CTASSERT(POLY1305_HASH_LEN == crypto_onetimeauth_poly1305_BYTES);
   17 CTASSERT(POLY1305_BLOCK_LEN == crypto_onetimeauth_poly1305_BYTES);
   18 
   19 static void
   20 xform_Poly1305_Init(void *polyctx)
   21 {
   22         /* Nop */
   23 }
   24 
   25 static void
   26 xform_Poly1305_Setkey(void *ctx, const uint8_t *key, u_int klen)
   27 {
   28         struct poly1305_xform_ctx *polyctx = ctx;
   29         int rc;
   30 
   31         if (klen != POLY1305_KEY_LEN)
   32                 panic("%s: Bogus keylen: %u bytes", __func__, (unsigned)klen);
   33 
   34         rc = crypto_onetimeauth_poly1305_init(&polyctx->state, key);
   35         if (rc != 0)
   36                 panic("%s: Invariant violated: %d", __func__, rc);
   37 }
   38 
   39 static int
   40 xform_Poly1305_Update(void *ctx, const void *data, u_int len)
   41 {
   42         struct poly1305_xform_ctx *polyctx = ctx;
   43         int rc;
   44 
   45         rc = crypto_onetimeauth_poly1305_update(&polyctx->state, data, len);
   46         if (rc != 0)
   47                 panic("%s: Invariant violated: %d", __func__, rc);
   48         return (0);
   49 }
   50 
   51 static void
   52 xform_Poly1305_Final(uint8_t *digest, void *ctx)
   53 {
   54         struct poly1305_xform_ctx *polyctx = ctx;
   55         int rc;
   56 
   57         rc = crypto_onetimeauth_poly1305_final(&polyctx->state, digest);
   58         if (rc != 0)
   59                 panic("%s: Invariant violated: %d", __func__, rc);
   60 }
   61 
   62 const struct auth_hash auth_hash_poly1305 = {
   63         .type = CRYPTO_POLY1305,
   64         .name = "Poly-1305",
   65         .keysize = POLY1305_KEY_LEN,
   66         .hashsize = POLY1305_HASH_LEN,
   67         .ctxsize = sizeof(struct poly1305_xform_ctx),
   68         .blocksize = POLY1305_BLOCK_LEN,
   69         .Init = xform_Poly1305_Init,
   70         .Setkey = xform_Poly1305_Setkey,
   71         .Update = xform_Poly1305_Update,
   72         .Final = xform_Poly1305_Final,
   73 };

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FreeBSD/Linux Kernel Cross Reference sys/opencrypto/xform_poly1305.c

FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/xform_poly1305.c