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 #include <opencrypto/xform_poly1305.h>
    8 
    9 #include <sodium/crypto_onetimeauth_poly1305.h>
   10 
   11 struct poly1305_xform_ctx {
   12         struct crypto_onetimeauth_poly1305_state state;
   13 };
   14 CTASSERT(sizeof(union authctx) >= sizeof(struct poly1305_xform_ctx));
   15 
   16 CTASSERT(POLY1305_KEY_LEN == crypto_onetimeauth_poly1305_KEYBYTES);
   17 CTASSERT(POLY1305_HASH_LEN == crypto_onetimeauth_poly1305_BYTES);
   18 
   19 void
   20 Poly1305_Init(struct poly1305_xform_ctx *polyctx)
   21 {
   22         /* Nop */
   23 }
   24 
   25 void
   26 Poly1305_Setkey(struct poly1305_xform_ctx *polyctx,
   27     const uint8_t key[__min_size(POLY1305_KEY_LEN)], size_t klen)
   28 {
   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 void
   40 xform_Poly1305_Setkey(void *ctx, const uint8_t *key, uint16_t klen)
   41 {
   42         Poly1305_Setkey(ctx, key, klen);
   43 }
   44 
   45 int
   46 Poly1305_Update(struct poly1305_xform_ctx *polyctx, const void *data,
   47     size_t len)
   48 {
   49         int rc;
   50 
   51         rc = crypto_onetimeauth_poly1305_update(&polyctx->state, data, len);
   52         if (rc != 0)
   53                 panic("%s: Invariant violated: %d", __func__, rc);
   54         return (0);
   55 }
   56 
   57 static int
   58 xform_Poly1305_Update(void *ctx, const uint8_t *data, uint16_t len)
   59 {
   60         return (Poly1305_Update(ctx, data, len));
   61 }
   62 
   63 void
   64 Poly1305_Final(uint8_t digest[__min_size(POLY1305_HASH_LEN)],
   65     struct poly1305_xform_ctx *polyctx)
   66 {
   67         int rc;
   68 
   69         rc = crypto_onetimeauth_poly1305_final(&polyctx->state, digest);
   70         if (rc != 0)
   71                 panic("%s: Invariant violated: %d", __func__, rc);
   72 }
   73 
   74 static void
   75 xform_Poly1305_Final(uint8_t *digest, void *ctx)
   76 {
   77         Poly1305_Final(digest, ctx);
   78 }
   79 
   80 struct auth_hash auth_hash_poly1305 = {
   81         .type = CRYPTO_POLY1305,
   82         .name = "Poly-1305",
   83         .keysize = POLY1305_KEY_LEN,
   84         .hashsize = POLY1305_HASH_LEN,
   85         .ctxsize = sizeof(struct poly1305_xform_ctx),
   86         .blocksize = crypto_onetimeauth_poly1305_BYTES,
   87         .Init = (void *)Poly1305_Init,
   88         .Setkey = xform_Poly1305_Setkey,
   89         .Update = xform_Poly1305_Update,
   90         .Final = xform_Poly1305_Final,
   91 };

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

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sys/opencrypto/xform_poly1305.c