ocrypto_rsa2048_oaep_sha256_crt_decrypt()

int ocrypto_rsa2048_oaep_sha256_crt_decrypt	(	uint8_t *	m,
		size_t	mlen,
		const uint8_t	c[256],
		const uint8_t *	label,
		size_t	llen,
		const ocrypto_rsa2048_crt_key *	sk )

#include <crypto/nrf_oberon/include/ocrypto_rsa.h>

2048-bit RSA OAEP SHA256 decryption with CRT acceleration.

The ciphertext c is decrypted to the message returned in m.

Parameters

[out]	m	The decrypted message. The buffer must be long enough to hold the message.
	mlen	Length of m.
	c	The 256-byte ciphertext to decrypt.
	label	The label associated with the message.
	llen	Length of label. May be 0.
	sk	A valid 2048-bit RSA secret key with CRT coefficients.

Return values

-1	If decryption failed.
-2	If the output buffer is too short (mlen < length of message).
n	If a message of length n was successfully decrypted.

Remarks

The key sk should be initialized with ocrypto_rsa2048_init_crt_key.

m may be same as c.