kmackay/micro-ecc
1
0
Fork 0
mirror of https://github.com/kmackay/micro-ecc.git synced 2026-07-30 23:27:46 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added functions for conversion to and from standard octet representation for integers.

Browse Source
This commit is contained in:
Ken MacKay
2013-06-30 11:01:13 -07:00
parent 033a4513d1
commit abe93b0b75
2 changed files with 46 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ecc.c
+23
View File
@@ -1494,3 +1494,26 @@ int ecdsa_verify(EccPoint *p_publicKey, uint32_t p_hash[NUM_ECC_DIGITS], uint32_
/* Accept only if v == r. */
return (vli_cmp(rx, r) == 0);
}
void ecc_bytes2int(uint32_t p_int[NUM_ECC_DIGITS], uint8_t p_bytes[NUM_ECC_DIGITS*4])
{
unsigned i;
for(i=0; i<NUM_ECC_DIGITS; ++i)
{
uint8_t *p_digit = p_bytes + 4 * (NUM_ECC_DIGITS - 1 - i);
p_int[i] = (p_digit[0] << 24) | (p_digit[1] << 16) | (p_digit[2] << 8) | p_digit[3];
}
}
void ecc_int2bytes(uint8_t p_bytes[NUM_ECC_DIGITS*4], uint32_t p_int[NUM_ECC_DIGITS])
{
unsigned i;
for(i=0; i<NUM_ECC_DIGITS; ++i)
{
uint8_t *p_digit = p_bytes + 4 * (NUM_ECC_DIGITS - 1 - i);
p_digit[0] = p_int[i] >> 24;
p_digit[1] = p_int[i] >> 16;
p_digit[2] = p_int[i] >> 8;
p_digit[3] = p_int[i];
}
}
ecc.h
+23 -1
View File
@@ -30,7 +30,7 @@ with strange assembler messages.
#define secp256r1 8
#define secp384r1 12
#ifndef ECC_CURVE
#define ECC_CURVE secp192r1
#define ECC_CURVE secp256r1
#endif
#if (ECC_CURVE != secp128r1 && ECC_CURVE != secp192r1 && ECC_CURVE != secp256r1 && ECC_CURVE != secp384r1)
@@ -130,4 +130,26 @@ Returns 1 if the signature is valid, 0 if it is invalid.
*/
int ecdsa_verify(EccPoint *p_publicKey, uint32_t p_hash[NUM_ECC_DIGITS], uint32_t r[NUM_ECC_DIGITS], uint32_t s[NUM_ECC_DIGITS]);
/* ecc_bytes2int() function.
Convert an integer in standard octet representation to the native format.
Outputs:
p_int - Will be filled in with the native integer value.
Inputs:
p_bytes - The standard octet representation of the integer to convert.
*/
void ecc_bytes2int(uint32_t p_int[NUM_ECC_DIGITS], uint8_t p_bytes[NUM_ECC_DIGITS*4]);
/* ecc_int2bytes() function.
Convert an integer in native format to the standard octet representation.
Outputs:
p_bytes - Will be filled in with the standard octet representation of the integer.
Inputs:
p_int - The native integer value to convert.
*/
void ecc_int2bytes(uint8_t p_bytes[NUM_ECC_DIGITS*4], uint32_t p_int[NUM_ECC_DIGITS]);
#endif /* _MICRO_ECC_H_ */