PBC Library Manual 0.5.11 - Stanford Crypto Group

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Equivalent to element_item(a, 0). element_t element_y(element_t a) Equivalent to element_item(a, 1). Chapter 4. Element functions 23
Chapter 5. Param functions Pairings are initialized from pairing parameters, which are objects of type pbc_param_t. Some applications can ignore this data type because pairing_init_set_str() handles it behind the scenes: it reads a string as a pbc_param_t, then initializes a pairing with these parameters. int pbc_param_init_set_str(pbc_param_t par, const char *s) Initializes pairing parameters from the string s. Returns 0 if successful, 1 otherwise. int pbc_param_init_set_buf(pbc_param_t par, const char *s, size_t len) Same, but read at most len bytes. If len is 0, it behaves as the previous function. Returns 0 if successful, 1 otherwise. void pbc_param_out_str(FILE *stream, pbc_param_t p) Write pairing parameters to ’stream’ in a text format. void pbc_param_clear(pbc_param_t p) Clear p. Call after p is no longer needed. 5.1. Param generation These were used to prepare the sample parameters in the param subdirectory. We label the pairing families with capital letters roughly in the order of discovery, so we can refer to them easily. Type A is fastest. Type D is a good choice when elements should be short but is slower. Type F has even shorter elements but is slower still. The speed differences are hardware-dependent, and also change when preprocessing is used. Type B and C are unimplemented. The pbc_cm_t data type holds CM parameters that are used to generate type D and G curves. 24
Page 1 and 2: PBC Library Manual 0.5.11 Ben Lynn
Page 3 and 4: Table of Contents Preface .........
Page 5 and 6: Preface The PBC library is a free p
Page 7 and 8: Chapter 1. Installing PBC The first
Page 9 and 10: Chapter 2. Tutorial This chapter wa
Page 11 and 12: 2.2. Import/export Chapter 2. Tutor
Page 13 and 14: Chapter 3. Pairing functions An app
Page 15 and 16: Chapter 3. Pairing functions Get re
Page 17 and 18: Chapter 4. Element functions Elemen
Page 19 and 20: void element_set0(element_t e) Set
Page 21 and 22: Chapter 4. Element functions z must
Page 23 and 24: Chapter 4. Element functions void e
Page 25 and 26: size_t element_out_str(FILE * strea
Page 27: int element_length_in_bytes_x_only(
Page 31 and 32: Chapter 5. Param functions Generate
Page 33 and 34: Chapter 6. Other functions Random n
Page 35 and 36: Reports informational message. void
Page 37 and 38: nd(G) init_pairing_A(); Other sampl
Page 39 and 40: Chapter 8. PBC internals The source
Page 41 and 42: Additionally, defining PBC_DEBUG ca
Page 43 and 44: The lack of an x term simplifies so
Page 45 and 46: Chapter 8. PBC internals b: E: y^2=
Page 47 and 48: Returns the pointer at index i in t
Page 49 and 50: Chapter 8. PBC internals I would li
Page 51: Appendix A. Contributors Ben Lynn w

PBC Library Manual 0.5.11 - Stanford Crypto Group

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