diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/crypto/Kconfig | 26 | ||||
| -rw-r--r-- | lib/crypto/poly1305.c | 74 |
2 files changed, 100 insertions, 0 deletions
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig index c4882d29879e..a731ea36bd5c 100644 --- a/lib/crypto/Kconfig +++ b/lib/crypto/Kconfig @@ -37,8 +37,34 @@ config CRYPTO_LIB_CHACHA config CRYPTO_LIB_DES tristate +config CRYPTO_LIB_POLY1305_RSIZE + int + default 1 + +config CRYPTO_ARCH_HAVE_LIB_POLY1305 + tristate + help + Declares whether the architecture provides an arch-specific + accelerated implementation of the Poly1305 library interface, + either builtin or as a module. + config CRYPTO_LIB_POLY1305_GENERIC tristate + help + This symbol can be depended upon by arch implementations of the + Poly1305 library interface that require the generic code as a + fallback, e.g., for SIMD implementations. If no arch specific + implementation is enabled, this implementation serves the users + of CRYPTO_LIB_POLY1305. + +config CRYPTO_LIB_POLY1305 + tristate "Poly1305 library interface" + depends on CRYPTO_ARCH_HAVE_LIB_POLY1305 || !CRYPTO_ARCH_HAVE_LIB_POLY1305 + select CRYPTO_LIB_POLY1305_GENERIC if CRYPTO_ARCH_HAVE_LIB_POLY1305=n + help + Enable the Poly1305 library interface. This interface may be fulfilled + by either the generic implementation or an arch-specific one, if one + is available and enabled. config CRYPTO_LIB_SHA256 tristate diff --git a/lib/crypto/poly1305.c b/lib/crypto/poly1305.c index f019a57dbc1b..32ec293c65ae 100644 --- a/lib/crypto/poly1305.c +++ b/lib/crypto/poly1305.c @@ -154,5 +154,79 @@ void poly1305_core_emit(const struct poly1305_state *state, void *dst) } EXPORT_SYMBOL_GPL(poly1305_core_emit); +void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key) +{ + poly1305_core_setkey(desc->r, key); + desc->s[0] = get_unaligned_le32(key + 16); + desc->s[1] = get_unaligned_le32(key + 20); + desc->s[2] = get_unaligned_le32(key + 24); + desc->s[3] = get_unaligned_le32(key + 28); + poly1305_core_init(&desc->h); + desc->buflen = 0; + desc->sset = true; + desc->rset = 1; +} +EXPORT_SYMBOL_GPL(poly1305_init_generic); + +void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src, + unsigned int nbytes) +{ + unsigned int bytes; + + if (unlikely(desc->buflen)) { + bytes = min(nbytes, POLY1305_BLOCK_SIZE - desc->buflen); + memcpy(desc->buf + desc->buflen, src, bytes); + src += bytes; + nbytes -= bytes; + desc->buflen += bytes; + + if (desc->buflen == POLY1305_BLOCK_SIZE) { + poly1305_core_blocks(&desc->h, desc->r, desc->buf, 1, 1); + desc->buflen = 0; + } + } + + if (likely(nbytes >= POLY1305_BLOCK_SIZE)) { + poly1305_core_blocks(&desc->h, desc->r, src, + nbytes / POLY1305_BLOCK_SIZE, 1); + src += nbytes - (nbytes % POLY1305_BLOCK_SIZE); + nbytes %= POLY1305_BLOCK_SIZE; + } + + if (unlikely(nbytes)) { + desc->buflen = nbytes; + memcpy(desc->buf, src, nbytes); + } +} +EXPORT_SYMBOL_GPL(poly1305_update_generic); + +void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *dst) +{ + __le32 digest[4]; + u64 f = 0; + + if (unlikely(desc->buflen)) { + desc->buf[desc->buflen++] = 1; + memset(desc->buf + desc->buflen, 0, + POLY1305_BLOCK_SIZE - desc->buflen); + poly1305_core_blocks(&desc->h, desc->r, desc->buf, 1, 0); + } + + poly1305_core_emit(&desc->h, digest); + + /* mac = (h + s) % (2^128) */ + f = (f >> 32) + le32_to_cpu(digest[0]) + desc->s[0]; + put_unaligned_le32(f, dst + 0); + f = (f >> 32) + le32_to_cpu(digest[1]) + desc->s[1]; + put_unaligned_le32(f, dst + 4); + f = (f >> 32) + le32_to_cpu(digest[2]) + desc->s[2]; + put_unaligned_le32(f, dst + 8); + f = (f >> 32) + le32_to_cpu(digest[3]) + desc->s[3]; + put_unaligned_le32(f, dst + 12); + + *desc = (struct poly1305_desc_ctx){}; +} +EXPORT_SYMBOL_GPL(poly1305_final_generic); + MODULE_LICENSE("GPL"); MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); |