diff options
Diffstat (limited to 'crypto/salsa20_generic.c')
| -rw-r--r-- | crypto/salsa20_generic.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c index b49328a..1fa4e4d 100644 --- a/crypto/salsa20_generic.c +++ b/crypto/salsa20_generic.c @@ -143,7 +143,6 @@ static void salsa20_encrypt_bytes(struct salsa20_ctx *ctx, u8 *dst, const u8 *src, unsigned int bytes) { u8 buf[64]; - int i; if (dst != src) memcpy(dst, src, bytes); @@ -156,15 +155,11 @@ static void salsa20_encrypt_bytes(struct salsa20_ctx *ctx, u8 *dst, ctx->input[9] = PLUSONE(ctx->input[9]); if (bytes <= 64) { - for (i = 0; i < bytes/4; ++i) - ((u32*)dst)[i] ^= ((u32*)buf)[i]; - for (i = bytes - bytes % 4; i < bytes; ++i) - dst[i] ^= buf[i]; + crypto_xor(dst, buf, bytes); return; } - for (i = 0; i < 64/4; ++i) - ((u32*)dst)[i] ^= ((u32*)buf)[i]; + crypto_xor(dst, buf, 64); bytes -= 64; dst += 64; } @@ -192,13 +187,30 @@ static int encrypt(struct blkcipher_desc *desc, int err; blkcipher_walk_init(&walk, dst, src, nbytes); - err = blkcipher_walk_virt(desc, &walk); + err = blkcipher_walk_virt_block(desc, &walk, 64); salsa20_ivsetup(ctx, walk.iv); - salsa20_encrypt_bytes(ctx, walk.dst.virt.addr, - walk.src.virt.addr, nbytes); - err = blkcipher_walk_done(desc, &walk, 0); + if (likely(walk.nbytes == nbytes)) + { + salsa20_encrypt_bytes(ctx, walk.dst.virt.addr, + walk.src.virt.addr, nbytes); + return blkcipher_walk_done(desc, &walk, 0); + } + + while (walk.nbytes >= 64) { + salsa20_encrypt_bytes(ctx, walk.dst.virt.addr, + walk.src.virt.addr, + walk.nbytes - (walk.nbytes % 64)); + err = blkcipher_walk_done(desc, &walk, walk.nbytes % 64); + } + + if (walk.nbytes) { + salsa20_encrypt_bytes(ctx, walk.dst.virt.addr, + walk.src.virt.addr, walk.nbytes); + err = blkcipher_walk_done(desc, &walk, 0); + } + return err; } |
