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lib_cxng: define MIN/MAX ECDSA signature length #1431

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lib_cxng: define MIN/MAX ECDSA signature length #1431

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8 changes: 8 additions & 0 deletions lib_cxng/include/lcx_ecdsa.h
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Expand Up @@ -33,6 +33,14 @@
#include "lcx_wrappers.h"
#include "lcx_ecfp.h"

// DER SIGNATURE FORMAT
// TAG(0x30) | TOT_LEN | TAG(0x02) | R_LEN | R | TAG(0x02) | S_LEN | S
// Min sig length (no padding): 1 + 1 + 2 * (1 + 1 + 32)
#define CX_ECDSA_SHA256_SIG_MIN_ASN1_LENGTH (70U)

// Max sig length (padding) : 1 + 1 + 2 * (1 + 1 + 33)
#define CX_ECDSA_SHA256_SIG_MAX_ASN1_LENGTH (72U)

/** @internal Backward compatibility */
#define cx_ecdsa_init_public_key cx_ecfp_init_public_key_no_throw
/** @internal Backward compatibility */
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