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Diffstat (limited to 'drivers/crypto/caam/key_gen.h')
-rw-r--r-- | drivers/crypto/caam/key_gen.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/crypto/caam/key_gen.h b/drivers/crypto/caam/key_gen.h index 5db055c25bd2..818f78f6fc1a 100644 --- a/drivers/crypto/caam/key_gen.h +++ b/drivers/crypto/caam/key_gen.h @@ -6,6 +6,36 @@ * */ +/** + * split_key_len - Compute MDHA split key length for a given algorithm + * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1, + * SHA224, SHA384, SHA512. + * + * Return: MDHA split key length + */ +static inline u32 split_key_len(u32 hash) +{ + /* Sizes for MDHA pads (*not* keys): MD5, SHA1, 224, 256, 384, 512 */ + static const u8 mdpadlen[] = { 16, 20, 32, 32, 64, 64 }; + u32 idx; + + idx = (hash & OP_ALG_ALGSEL_SUBMASK) >> OP_ALG_ALGSEL_SHIFT; + + return (u32)(mdpadlen[idx] * 2); +} + +/** + * split_key_pad_len - Compute MDHA split key pad length for a given algorithm + * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1, + * SHA224, SHA384, SHA512. + * + * Return: MDHA split key pad length + */ +static inline u32 split_key_pad_len(u32 hash) +{ + return ALIGN(split_key_len(hash), 16); +} + struct split_key_result { struct completion completion; int err; |