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DM: crypto/rsa_mod_exp: Add rsa Modular Exponentiation DM driver

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Add a new rsa uclass for performing modular exponentiation and implement
the software driver basing on this uclass.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
CC: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ruchika Gupta
2015-01-23 16:01:52 +05:30
committed by Simon Glass
parent c4beb22fcd
commit 31d2b4fd90
7 changed files with 117 additions and 1 deletions
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34
include/u-boot/rsa-mod-exp.h
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@@ -35,9 +35,41 @@ struct key_prop {
* @sig: RSA PKCS1.5 signature
* @sig_len: Length of signature in number of bytes
* @node: Node with RSA key elements like modulus, exponent, R^2, n0inv
* @out: Result in form of byte array
* @out: Result in form of byte array of len equal to sig_len
*/
int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len,
struct key_prop *node, uint8_t *out);
int rsa_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
struct key_prop *node, uint8_t *out);
/**
* struct struct mod_exp_ops - Driver model for RSA Modular Exponentiation
* operations
*
* The uclass interface is implemented by all crypto devices which use
* driver model.
*/
struct mod_exp_ops {
/**
* Perform Modular Exponentiation
*
* Operation: out[] = sig ^ exponent % modulus
*
* @dev: RSA Device
* @sig: RSA PKCS1.5 signature
* @sig_len: Length of signature in number of bytes
* @node: Node with RSA key elements like modulus, exponent,
* R^2, n0inv
* @out: Result in form of byte array of len equal to sig_len
*
* This function computes exponentiation over the signature.
* Returns: 0 if exponentiation is successful, or a negative value
* if it wasn't.
*/
int (*mod_exp)(struct udevice *dev, const uint8_t *sig,
uint32_t sig_len, struct key_prop *node,
uint8_t *outp);
};
#endif