diff options
Diffstat (limited to 'drivers/crypto/caam/key_gen.c')
| -rw-r--r-- | drivers/crypto/caam/key_gen.c | 62 |
1 files changed, 54 insertions, 8 deletions
diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c index e1eaf4ff9762..1bb2816a9b4d 100644 --- a/drivers/crypto/caam/key_gen.c +++ b/drivers/crypto/caam/key_gen.c @@ -10,6 +10,36 @@ #include "desc_constr.h" #include "key_gen.h" +/** + * 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); +} + void split_key_done(struct device *dev, u32 *desc, u32 err, void *context) { @@ -41,15 +71,29 @@ Split key generation----------------------------------------------- [06] 0x64260028 fifostr: class2 mdsplit-jdk len=40 @0xffe04000 */ -int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, - int split_key_pad_len, const u8 *key_in, u32 keylen, - u32 alg_op) +int gen_split_key(struct device *jrdev, u8 *key_out, + struct alginfo * const adata, const u8 *key_in, u32 keylen, + int max_keylen) { u32 *desc; struct split_key_result result; dma_addr_t dma_addr_in, dma_addr_out; int ret = -ENOMEM; + adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK); + adata->keylen_pad = split_key_pad_len(adata->algtype & + OP_ALG_ALGSEL_MASK); + +#ifdef DEBUG + dev_err(jrdev, "split keylen %d split keylen padded %d\n", + adata->keylen, adata->keylen_pad); + print_hex_dump(KERN_ERR, "ctx.key@" __stringify(__LINE__)": ", + DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1); +#endif + + if (adata->keylen_pad > max_keylen) + return -EINVAL; + desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA); if (!desc) { dev_err(jrdev, "unable to allocate key input memory\n"); @@ -63,7 +107,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, goto out_free; } - dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len, + dma_addr_out = dma_map_single(jrdev, key_out, adata->keylen_pad, DMA_FROM_DEVICE); if (dma_mapping_error(jrdev, dma_addr_out)) { dev_err(jrdev, "unable to map key output memory\n"); @@ -74,7 +118,9 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG); /* Sets MDHA up into an HMAC-INIT */ - append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT); + append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) | + OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT | + OP_ALG_AS_INIT); /* * do a FIFO_LOAD of zero, this will trigger the internal key expansion @@ -87,7 +133,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, * FIFO_STORE with the explicit split-key content store * (0x26 output type) */ - append_fifo_store(desc, dma_addr_out, split_key_len, + append_fifo_store(desc, dma_addr_out, adata->keylen, LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); #ifdef DEBUG @@ -108,11 +154,11 @@ int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, #ifdef DEBUG print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", DUMP_PREFIX_ADDRESS, 16, 4, key_out, - split_key_pad_len, 1); + adata->keylen_pad, 1); #endif } - dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len, + dma_unmap_single(jrdev, dma_addr_out, adata->keylen_pad, DMA_FROM_DEVICE); out_unmap_in: dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE); |