Cryptographic Token Interface Standard

PKCS#11

ECDSA with SHA-1

The ECDSA with SHA-1 mechanism, denoted CKM_ECDSA_SHA1, is a mechanism for single- and multiple-part signatures and verification for ECDSA. This mechanism computes the entire ECDSA specification, including the hashing with SHA-1.

For the purposes of this mechanism, an ECDSA signature is a 40-byte string, corresponding to the concatenation of the ECDSA values r and s, each represented most-significant byte first.

This mechanism does not have a parameter.

Constraints on key types and the length of data are summarized in the following table: 




 Table 67, ECDSA with SHA-1: Key And Data Length   
Function Key type 

Input length

 

Output length

   


C_Sign ECDSA private key 

any

 

40

   


C_Verify ECDSA public key 

any, 402

 

N/A

  

 



2 Data length, signature length.


For this mechanism, the ulMinKeySize and ulMaxKeySize  fields of the CK_MECHANISM_INFO structure specify the minimum and maximum supported number of bits in the field sizes, respectively. For example, if a Cryptoki library supports only ECDSA using a field of characteristic 2 which has between 2200 and 2300 elements, then ulMinKeySize = 201 and ulMaxKeySize = 301 (when written in binary notation, the number 2200 consists of a 1 bit followed by 200 0 bits. It is therefore a 201-bit number. Similarly, 2300 is a 301-bit number).


 
 



RSA Security Inc. Public-Key Cryptography Standards - 
PKCS#11 - v210