Commit e6414b13 authored by Gary R Hook's avatar Gary R Hook Committed by Herbert Xu

crypto: ccp - Fix handling of RSA exponent on a v5 device

The exponent size in the ccp_op structure is in bits. A v5
CCP requires the exponent size to be in bytes, so convert
the size from bits to bytes when populating the descriptor.

The current code references the exponent in memory, but
these fields have not been set since the exponent is
actually store in the LSB. Populate the descriptor with
the LSB location (address).
Signed-off-by: default avatarGary R Hook <>
Signed-off-by: default avatarHerbert Xu <>
parent 89277a7d
......@@ -403,7 +403,7 @@ static int ccp5_perform_rsa(struct ccp_op *op)
CCP5_CMD_PROT(&desc) = 0;
function.raw = 0;
CCP_RSA_SIZE(&function) = op->u.rsa.mod_size;
CCP_RSA_SIZE(&function) = op->u.rsa.mod_size >> 3;
CCP5_CMD_FUNCTION(&desc) = function.raw;
CCP5_CMD_LEN(&desc) = op->u.rsa.input_len;
......@@ -418,10 +418,10 @@ static int ccp5_perform_rsa(struct ccp_op *op)
CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma);
/* Key (Exponent) is in external memory */
CCP5_CMD_KEY_LO(&desc) = ccp_addr_lo(&op->exp.u.dma);
CCP5_CMD_KEY_HI(&desc) = ccp_addr_hi(&op->exp.u.dma);
/* Exponent is in LSB memory */
CCP5_CMD_KEY_LO(&desc) = op->sb_key * LSB_ITEM_SIZE;
CCP5_CMD_KEY_HI(&desc) = 0;
return ccp5_do_cmd(&desc, op->cmd_q);
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